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Old 05-16-2009, 09:25 PM   #1
stlb5
Scooby Newbie
 
Member#: 107700
Join Date: Feb 2006
Chapter/Region: MWSOC
Location: St. Louis, MO
Vehicle:
2007 STI
CGM

Default Hesitation/Surging 2400 to 3000 RPM and 15-30% throttle

Hey guys, 07 STI, stage 1. I'm getting quite a bit of hesitation, even jerkiness between 2400 and 3000 RPM. I've logged a lot and watched the screen a lot and have found this to be very repeatable. When pressing on the throttle, I start seeing FLKC starting at about 20% throttle open angle when I'm in the 2400-3000 range. I'll keep seeing FLKC until I hit about 30% open or 3000RPM. If I go up past 20% and I'm in the 2400-3000 range and I start to back off the throttle, I'll keep getting FLKC until I drop under 15%. I've got logs to show all of this. 95% of the time this occurs in closed loop. Every now and then I'll catch it just briefly hit open loop with the FLKC still occuring. I'm seeing FLKC values down to -4.92 and am getting FBKC down to -11.95. This is all occuring under low (1.25ish) engine load. Now I'm not just being anal about seeing FLKC numbers, the car is hesitating when this is happening and can get quite jerky. It's more of a nuissance and happens mostly during highway cruising, or just gentle acceleration. Any ideas?
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Old 05-16-2009, 11:06 PM   #2
fnlyfnd
Scooby Newbie
 
Member#: 100247
Join Date: Nov 2005
Chapter/Region: Tri-State
Location: WNY
Vehicle:
2015 Outback Premium
Carbide Gray

Default

If your stock un-modified than go back to the stock map for now. That is a bunch of knock and you are not doing anything good to that engine driving around on it. I am not experienced enough to feel confident in giving you advice. Except for the aforementioned. Jerky engines and hesitations are not good, as you know. You need to pull timing or get some better gas...I'll let someone more knowledgeable help.

Post some logs too
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Old 05-17-2009, 10:48 AM   #3
stlb5
Scooby Newbie
 
Member#: 107700
Join Date: Feb 2006
Chapter/Region: MWSOC
Location: St. Louis, MO
Vehicle:
2007 STI
CGM

Default

I'm running Shell 93, always do. 90% of the time it's from the same Shell station. The knock I'm getting is at load engine load. I can avoid it by varying the throttle position or in how I shift. Obviously I'd prefer to figure what's going on than use these methods. Here's another thread that had very similar conditions. The fix was Gabe's throttle map, but that's what I'm running and still getting this:

http://www.iwsti.com/forums/ecu-tuni...e-bucking.html


I deleted a few columns. IAM was 1 the whole time, Wastegate DC was 0, Intake Air was 63. I don't know what the standard is for the letter abberviations, here's what I used:

AFC = A/F Correction #1 (%)
AFL = A/F Learning #1 (%)
CLOL = CL/OL Fueling* (status)
LOAD = Engine Load (Calculated) (g/rev)
FBKC = Feedback Knock Correction
FLKC = Fine Learning Knock Correction
IDC = Injector Duty Cycle
PSI = Manifold Pressure
MAF = Mass Airflow g/s
TOA = Throttle Opening Angle (%)
MPH = Vehicle Speed

Here's a spot where the FLKC would follow the throttle position:
Code:
AFC	AFL	CLOL	LOAD	RPM	FBKC	FLKC	IDC	PSI	MAF	TOA	MPH
-1.56	-0.78	8	0.3	2368	0	0	4.04	-9.87	11.78	8.24	39
-1.56	-0.78	8	0.32	2354	0	0	4.54	-9.43	12.37	9.02	39
0	-0.78	8	0.53	2348	0	0	6.01	-8.13	20.3	13.33	39
-2.34	-0.78	8	0.81	2373	0	0	9.1	-4.64	32.32	18.43	39
-3.12	-0.78	8	0.86	2365	0	0	9.57	-3.63	34.06	19.22	39
-2.34	-0.78	8	0.9	2394	0	0	10.23	-3.34	35.3	19.61	39
-2.34	-0.78	8	1.02	2396	0	-3.52	11.25	-2.32	40.54	22.75	39
-3.12	-0.78	8	1.26	2389	0	-3.52	14.05	-0.58	50.03	27.45	39
0.78	-1.56	8	1.23	2446	0	-3.52	14.38	0.58	50.87	28.24	40
1.56	-1.56	8	1.34	2414	0	-4.92	15.09	0.87	53.97	27.84	40
3.12	-2.34	8	1.37	2489	0	-4.92	15.98	1.6	56.32	27.84	40
3.91	-2.34	8	1.45	2486	0	-4.92	16.72	2.18	59.26	28.24	40
5.47	-4.69	8	1.47	2468	0	-4.92	17	2.32	60.73	27.45	40
7.81	-4.69	8	1.45	2537	0	-4.92	17.57	2.32	61.19	25.88	40
7.03	-4.69	8	1.23	2555	0	-3.52	15.88	0.73	52.35	21.18	40
6.25	-4.69	8	1.1	2572	0	-3.52	13.64	-0.73	46.93	19.22	42
5.47	-4.69	8	1.06	2589	0	-3.52	13.95	-1.02	46.84	19.61	42
4.69	-4.69	8	1.04	2628	0	-3.52	13.47	-1.31	45.32	19.22	42
4.69	-4.69	8	1.04	2630	0	-3.52	12.91	-1.45	45.06	19.61	42
4.69	-4.69	8	1.01	2656	0	-3.52	12.96	-1.74	44.95	19.22	43
4.69	-4.69	8	1.03	2669	0	-3.52	13.13	-1.74	46.5	19.61	43
3.91	-4.69	8	1.07	2657	0	-3.52	13.19	-1.45	47.77	20.78	43
6.25	-4.69	8	1.31	2739	0	-3.52	16.94	1.02	59.56	26.67	43
7.81	-4.69	8	1.36	2751	0	-4.92	17.54	1.6	61.64	26.67	44
7.81	-4.69	8	1.39	2784	0	-4.92	18.29	1.89	63.83	26.67	44
7.81	-4.69	8	1.41	2812	0	-4.92	19.14	2.47	65.24	26.27	45
7.81	-4.69	8	1.41	2796	0	-4.92	19.26	2.47	66.8	25.49	45
7.81	-4.69	8	1.37	2859	0	-4.92	18.99	2.32	64.61	24.71	46
8.59	-4.69	8	1.37	2890	0	-4.92	18.95	2.47	66.02	23.92	46
7.81	-4.69	8	1.29	2894	0	-4.92	17.76	1.74	63.36	23.14	47
7.03	-4.69	8	1.07	2914	0	-3.52	15.57	-0.29	51.9	19.61	47
3.91	-4.69	8	0.82	2962	0	-3.52	12.61	-2.47	40.57	16.86	47
5.47	-3.91	8	0.77	2981	0	0	12.04	-3.48	38.21	16.86	47
5.47	-3.91	8	0.76	2989	0	0	11.37	-3.92	38.34	16.86	48
Here's a spot where I was going OL/CL and the FLKC was following:

Code:
AFC	AFL	CLOL	LOAD	RPM	FBKC	FLKC	IDC	PSI	MAF	TOA	MPH
8.59	-2.34	8	0.23	2493	0	0	1.6	-10.45	9.74	6.67	50
0	-0.78	10	0.22	2506	0	0	1.6	-10.45	9.16	6.67	50
0	-0.78	10	0.22	2476	0	0	1.59	-10.45	9.16	6.27	49
0	-0.78	10	0.28	2488	0	0	4.22	-10.45	10.85	7.45	49
0	-0.78	10	0.84	2492	0	0	9.5	-6.24	30.92	20.39	49
-9.38	-0.78	8	1.22	2492	0	-3.52	12.7	-0.73	49.43	32.16	49
-2.34	-1.56	8	1.33	2478	0	-3.52	14.61	0.44	55	34.12	48
3.12	-1.56	8	1.38	2519	0	-4.92	16.76	1.45	57.79	34.51	48
3.91	-1.56	8	1.49	2502	-1.41	-4.92	18.02	2.32	61.8	34.51	48
5.47	-2.34	8	1.55	2535	-1.41	-4.92	19.08	3.19	65.24	33.33	48
7.03	-4.69	8	1.63	2540	-1.41	-4.92	19.26	4.21	67.89	33.33	48
0	-4.69	10	1.67	2534	-2.81	0	20.13	4.79	71.12	32.55	48
0	-4.69	10	1.64	2556	-2.81	0	20.28	5.08	70.79	30.98	49
0	-4.69	10	1.55	2636	-2.81	0	18.39	4.79	67.42	26.67	49
5.47	-4.69	8	1.02	2622	-2.81	-4.92	13.72	1.45	48.37	16.86	50
7.03	-3.91	8	0.5	2587	-1.41	0	8.98	-4.5	22.37	10.98	50
7.81	-3.91	8	0.22	2591	0	0	4.42	-8.85	9.26	7.45	50
7.81	-3.12	8	0.2	2569	0	0	3.84	-10.01	8.55	6.27	50
8.59	-3.12	8	0.23	2570	0	0	1.64	-10.3	9.74	6.67	50
0	-3.12	10	0.23	2557	0	0	1.64	-10.3	9.6	6.67	50
And here's the nasty one:

Code:
AFC	AFL	CLOL	LOAD	RPM	FBKC	FLKC	IDC	PSI	MAF	TOA	MPH
0.78	-4.69	8	1.23	2317	0	0	13.38	0.58	48.36	23.53	43
-1.56	-4.69	8	1.27	2368	0	0	13.46	1.02	49.1	23.53	44
0	-4.69	8	1.28	2327	0	0	13.29	0.73	50.13	23.53	44
0.78	-4.69	8	1.28	2367	0	0	13.65	0.87	50.87	23.53	45
0.78	-4.69	8	1.3	2368	0	-3.52	13.6	1.02	51.17	23.53	45
0.78	-4.69	8	1.3	2369	-1.41	-3.52	14.34	1.02	51.9	23.53	45
1.56	-4.69	8	1.31	2420	-1.41	0	14.47	1.45	52.94	23.92	45
0.78	-4.69	8	1.31	2406	-2.81	0	14.08	1.6	52.79	23.14	46
1.56	-4.69	8	1.39	2397	-2.81	-4.92	14.8	1.89	56.18	24.31	46
0.78	-4.69	8	1.38	2404	-2.81	-4.92	14.87	1.89	54.85	23.14	46
1.56	-4.69	8	1.35	2444	-2.81	-4.92	14.93	2.03	54.56	23.53	46
1.56	-4.69	8	1.38	2420	-2.46	-4.92	14.96	1.89	56.76	23.53	47
1.56	-4.69	8	1.33	2412	-2.46	-4.92	14.93	1.89	55.15	22.75	47
0.78	-4.69	8	1.41	2404	-2.46	-4.92	14.92	2.03	57.06	23.53	47
0.78	-4.69	8	1.34	2496	-2.46	-4.92	15.26	1.89	55.3	23.14	47
1.56	-4.69	8	1.36	2377	-2.46	-4.92	15	1.89	56.18	21.96	47
1.56	-4.69	8	1.34	2447	-2.11	-4.92	14.56	1.6	53.97	22.75	47
2.34	-4.69	8	1.33	2449	-3.52	-4.92	15.23	1.6	53.97	22.75	47
1.56	-4.69	8	1.37	2470	-3.52	-4.92	15.33	1.89	55.88	23.53	47
0	-4.69	8	1.35	2458	-3.52	-4.92	14.66	1.74	55	23.14	47
3.12	-4.69	8	1.41	2436	-4.92	-4.92	15.48	2.18	56.76	23.53	47
2.34	-4.69	8	1.39	2456	-4.92	-4.92	15.73	2.18	57.06	23.14	47
0.78	-4.69	8	1.41	2488	-4.92	-4.92	15.71	2.32	58.09	23.53	47
1.56	-4.69	8	1.39	2483	-4.92	-4.92	15.97	2.32	57.94	23.14	48
1.56	-4.69	8	1.4	2477	-4.92	-4.92	15.73	2.32	57.5	23.53	48
3.12	-4.69	8	1.41	2482	-4.57	-4.92	15.98	2.32	58.53	23.53	47
2.34	-4.69	8	1.37	2502	-4.57	-4.92	16.16	2.47	57.65	23.53	47
1.56	-4.69	8	1.43	2418	-4.57	-4.92	15.42	2.32	57.94	23.14	48
1.56	-4.69	8	1.35	2464	-5.98	-4.92	15.33	2.18	56.47	22.35	48
1.56	-4.69	8	1.34	2464	-5.98	-4.92	14.13	1.74	55	21.18	48
1.56	-4.69	8	1.32	2456	-5.98	-4.92	14.75	1.31	53.68	21.96	48
1.56	-4.69	8	1.28	2459	-5.98	-4.92	14.86	1.31	52.94	21.57	48
1.56	-4.69	8	1.33	2436	-5.62	-4.92	14.65	1.31	53.23	21.57	48
0.78	-4.69	8	1.24	2492	-5.62	-3.52	14.61	1.02	51.46	21.57	48
1.56	-4.69	8	1.23	2467	-5.62	-3.52	14.19	0.87	50.28	20.39	48
0	-4.69	8	1.18	2495	-7.03	-3.52	13.26	0.29	48.95	20.39	48
1.56	-4.69	8	1.15	2477	-7.03	-3.52	13.24	0	48.21	20	48
0	-4.69	8	1.12	2511	-7.03	-3.52	13.1	-0.15	47.48	20	48
1.56	-4.69	8	1.15	2448	-7.03	-3.52	13.16	-0.15	48.21	20.39	48
0.78	-4.69	8	1.14	2476	-6.68	-3.52	13.09	-0.15	47.47	20.39	48
0.78	-4.69	8	1.14	2464	-6.68	-3.52	13.15	-0.15	47.32	20.39	48
0.78	-4.69	8	1.14	2489	-6.68	-3.52	13.34	-0.15	47.92	20	48
0	-4.69	8	1.18	2486	-6.68	-3.52	13.13	-0.29	48.59	20.78	48
0.78	-4.69	8	1.18	2472	-6.33	-3.52	13.35	0	48.51	21.18	48
0.78	-4.69	8	1.16	2473	-6.33	-3.52	13.16	0	48.51	20.78	48
0.78	-4.69	8	1.17	2518	-6.33	-3.52	13.43	0.15	48.8	21.18	48
0.78	-4.69	8	1.17	2503	-7.73	-3.52	13.29	0	48.65	21.18	48
0	-4.69	8	1.18	2478	-7.73	-3.52	13.2	0	48.65	21.18	48
1.56	-4.69	8	1.16	2496	-7.73	-3.52	13.99	0.15	49.1	20.78	48
0.78	-4.69	8	1.18	2508	-9.14	-3.52	13.48	0.15	49.84	21.18	48
1.56	-4.69	8	1.2	2498	-9.14	-3.52	13.66	0.29	48.95	20.78	48
0.78	-4.69	8	1.18	2528	-9.14	-3.52	13.43	0.29	49.69	21.18	48
1.56	-4.69	8	1.2	2500	-9.14	-3.52	13.75	0.29	50.72	21.18	48
0.78	-4.69	8	1.18	2494	-8.79	-3.52	13.6	0.44	49.39	20.78	48
0.78	-4.69	8	1.22	2410	-10.2	-3.52	13.17	0.15	49.54	20.78	48
0.78	-4.69	8	1.2	2454	-10.2	-3.52	13.58	0.29	48.8	20.78	48
0.78	-4.69	8	1.19	2484	-10.2	-3.52	13.83	0.29	49.39	20.78	48
0.78	-4.69	8	1.24	2440	-11.6	-3.52	13.53	0.29	49.69	21.18	48
0.78	-4.69	8	1.2	2490	-11.6	-3.52	13.25	0.44	48.65	20.78	48
1.56	-4.69	8	1.21	2462	-11.6	-3.52	13.81	0.58	49.84	21.18	48
0.78	-4.69	8	1.23	2495	-11.95	-3.52	13.44	0.58	49.69	21.18	48
0.78	-4.69	8	1.23	2443	-11.95	-3.52	13.54	0.58	50.28	21.18	48
0.78	-4.69	8	1.22	2426	-11.95	-3.52	13.48	0.44	50.13	21.18	47
0.78	-4.69	8	1.2	2464	-11.95	-3.52	13.49	0.58	49.25	20.78	47
1.56	-4.69	8	1.23	2454	-11.95	-3.52	13.67	0.44	49.84	20.78	48
0.78	-4.69	8	1.24	2392	-11.95	-3.52	13.37	0.58	49.54	20.78	48
1.56	-4.69	8	1.23	2406	-11.95	-3.52	13.39	0.58	49.69	21.18	47
0.78	-4.69	8	1.22	2434	-11.95	-3.52	13.35	0.73	49.39	21.18	47
0.78	-4.69	8	1.21	2399	-11.95	-3.52	13.38	0.58	48.36	20.78	47
1.56	-4.69	8	1.2	2412	-11.95	-3.52	13.33	0.58	48.65	20.78	47
1.56	-4.69	8	1.2	2418	-11.95	-3.52	13.25	0.58	48.8	20.78	47
1.56	-4.69	8	1.23	2375	-11.95	-3.52	13.22	0.44	48.51	20.78	47
1.56	-4.69	8	1.25	2395	-11.95	-3.52	13.32	0.58	48.8	20.78	47
0.78	-4.69	8	1.24	2387	-11.95	-3.52	13.24	0.73	49.39	21.57	47
1.56	-4.69	8	1.27	2372	-11.95	-3.52	13.69	1.02	51.02	21.96	47
0.78	-4.69	8	1.28	2388	-11.6	-3.52	13.84	1.16	50.87	21.57	47
0.78	-4.69	8	1.28	2349	-11.6	-3.52	13.64	1.31	51.02	21.57	47
0.78	-4.69	8	1.3	2363	-11.6	-3.52	13.53	1.02	50.13	21.18	47
0	-4.69	8	1.26	2354	-11.95	-3.52	13.39	1.02	48.95	20.78	46
0.78	-4.69	8	1.22	2395	-11.95	-3.52	13.59	0.87	49.25	21.18	46
1.56	-4.69	8	1.21	2384	-11.95	-3.52	13.23	0.87	48.95	21.18	46
1.56	-4.69	8	1.26	2364	-11.95	-3.52	12.86	0.73	48.8	21.18	46
0.78	-4.69	8	1.17	2392	-11.6	-3.52	13.42	0.73	47.32	20.78	46
-0.78	-3.91	8	0.32	2414	-9.49	0	7.19	-5.8	19.4	7.84	46
-5.47	-3.91	8	0.18	2345	-4.22	0	3.5	-9.29	6.63	5.88	46
-5.47	-3.12	8	0.22	2336	0	0	1.5	-10.01	8.42	6.27	46
0	-3.12	10	0.24	2314	0	0	1.48	-10.01	9.16	6.27	46
0	-3.12	10	0.22	2254	0	0	1.45	-10.16	8.42	5.88	46
0	-0.78	10	0.24	2206	0	0	1.42	-10.16	8.98	5.88	45

Last edited by stlb5; 05-17-2009 at 10:53 AM.
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Old 05-17-2009, 12:43 PM   #4
TDagen
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Member#: 163648
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Lets see what your afrs are at... I can see your engine load stumbling up and down.. and I bet if you log fuel injector # 1 pulsewidth you will see your injectors squirting a little then alot ect as your load jumps and dives (just like mine...). This is a very annoying problem...
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Old 05-21-2009, 10:18 AM   #5
RedefinedTR
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My 08 does it too, but I think it has something to do with the overlap on the AVCS causing it for emissions. I am not sure what the problem is on the 07's nor was I aware that there was really a problem. I would look at your pulsewidth and adjust your scaling so it is more stepped. I keep seeing that if it is blocked this issue comes up more often. Just my 2cents I am a newb at this tuning, but I have spent quite a bit of time over the past few weeks with some professional tuners learning how to fix this problem.
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Old 05-27-2009, 11:59 PM   #6
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I am having this EXACT issue.

I have been logging and monitoring this problem on and off for almost a month, but have been paying closer attention within the last week because the problem has gotten worse.

I am seeing the same instances of FLKC, but with slightly less of an amount of timing being pulled.
I rarely notice the FBKC events in occuring in my logs, mainly the FLKC values.

I also ALWAYS get my gas at the same Shell or BP gas stations near my house. I have been conjuring conspiracies in my head about the actual octane rating of the 93 that I have filling up with, and wondering if the fuel is getting worse while the gas price still continues to rise...


EDIT: HOLY ****. Maybe my conspiracies arent that crazy. All of us complaining about actually experiencing this problem in this thread all seem to reside in the Midwest area of the the US....




Last edited by 2xhighpsi; 05-28-2009 at 12:06 AM.
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Old 06-21-2009, 09:58 PM   #7
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Got the same issue, on my 2.0L WRX with opensource tune... and get this... I'm having a similar issue with my 05 built STI with protune ...the wrx stutters between 2k-3krpm ONLY during light throttle, after an ecu reset it's fine for a few days, then starts to do it again. The STI runs super rich and backfires in the same rpm range, mostly just in second gear and is more frequent during light throttle also. Same scenario with the ECU reset.. then a few days later, hesitation and some backfire.
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Old 06-21-2009, 10:00 PM   #8
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Check your crankcase to pcv valve hose...
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Old 06-23-2009, 02:59 PM   #9
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Quote:
Originally Posted by JSarv View Post
Check your crankcase to pcv valve hose...

Check it for what though?

Mine is definitely connected, and I cant find any type of flaw.


I have battled with this symptom forever, and I cant even remember when it started happening in the first place.
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Old 06-23-2009, 04:28 PM   #10
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3-4 psi and still in closed loop is great for emissions, but not for drivability and power. let the car go into open loop and target 13:1 in the load ranges that correspond to 3-4 psi at those RPM spots. see if that corrects the det you're seeing.
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Old 06-24-2009, 09:31 AM   #11
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Quote:
Originally Posted by benw View Post
3-4 psi and still in closed loop is great for emissions, but not for drivability and power. let the car go into open loop and target 13:1 in the load ranges that correspond to 3-4 psi at those RPM spots. see if that corrects the det you're seeing.
+ 1 set it up to go in open loop earlier

also fuel could be another contributing factor , I seen it first hand many times over and over fuel station orders too much regular 87 guess were its going !
right in the super unleaded tanks.
the gas station has to get rid of the fuel off the truck some how!

I bet that the majority of people complaining about certain driveability problems suddenly popping up is from crap lower octane gas being thrown in the high octane tank under ground
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Old 06-29-2009, 03:01 PM   #12
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bump this back up.

I noticed from some logs that the hesitation seems to come when feathering light throttle, and the ECU switches from CL to OL fueling. Upon reapplying throttle, the map switches back to CL fueling, and that seems to be when the hesitation occurs. Im stumped; I tried revising a slight amount of the Tip In Enrichment levels, but it didnt do much of anything. Any other suggestions/ideas?
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Old 06-29-2009, 03:15 PM   #13
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Quote:
Originally Posted by 2xhighpsi View Post
bump this back up.

I noticed from some logs that the hesitation seems to come when feathering light throttle, and the ECU switches from CL to OL fueling. Upon reapplying throttle, the map switches back to CL fueling, and that seems to be when the hesitation occurs. Im stumped; I tried revising a slight amount of the Tip In Enrichment levels, but it didnt do much of anything. Any other suggestions/ideas?
have you zero'd out your CL/OL Delay?
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Old 06-29-2009, 03:19 PM   #14
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Check your grounds. I was having the same issue, and solved it since I found a ground that went from the transmission to the firewall was disconnected. Doesn't seem to make sense that a ground on the tranny would solve a fuel delivery issue, but it did for me.

Threads of note:

http://forums.nasioc.com/forums/show....php?t=1789829

http://www.romraider.com/forum/topic4986.html
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Old 06-29-2009, 04:08 PM   #15
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Cars with poor compression tend to knock in vacuum when you stab the gas. I'd do a compression test.
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Old 06-29-2009, 05:12 PM   #16
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Quote:
Originally Posted by 06rexwagon View Post
Cars with poor compression tend to knock in vacuum when you stab the gas. I'd do a compression test.
true, but let's not scare the **** out of the guy either. knocking in vac on throttle stab can also be attributed to a number of different things on these engines.

although I will agree that anyone with an 07+ STI should be doing daily compression tests.
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Old 06-29-2009, 05:32 PM   #17
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Quote:
Originally Posted by the suicidal eggroll View Post
have you zero'd out your CL/OL Delay?
CL/OL Delay has been zero'd. None of the other CL to OL Transition with Delay tables have been touched.

Quote:
Originally Posted by benw View Post
true, but let's not scare the **** out of the guy either. knocking in vac on throttle stab can also be attributed to a number of different things on these engines.

although I will agree that anyone with an 07+ STI should be doing daily compression tests.
I am not seeing much of knock though. When there is definitely a hesitation/jerkiness, only once in a while I will see -2.00 knock correction
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Old 06-30-2009, 12:29 AM   #18
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The logs in the first post show -4.92 degrees.
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Old 06-30-2009, 03:34 AM   #19
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Quote:
Originally Posted by 2xhighpsi View Post

EDIT: HOLY ****. Maybe my conspiracies arent that crazy. All of us complaining about actually experiencing this problem in this thread all seem to reside in the Midwest area of the the US....




+1 i live in the midwest and i am also experiencing the exact same thing. Call me crazy but im pretty sure the shadow government/elvis has something to do with it.
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Old 08-14-2009, 06:37 PM   #20
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Has anyone actually solved this problem? I'm experiencing exactly the same symptoms: hesitation in the 2400-3000 rpm range with very light throttle, in first four gears. Most pronounced in 2 gear.

91 octane here in Montana. Car runs great otherwise. WOT is impressive. Engine is Frankenstein: ej257 mated to ej20 heads. All the usual mods that go along with it, including Perrin fuel rails and Walbro pump. No fade at redline, which is 7500 rpm.

Here's the weird thing: I put in the neighbors MAF sensor, and the car ran great. No hesitation. Smooth as butter at any rpm in any gear.

Naturally, I changed the MAF sensor (new OEM). Still had the hesitation, maybe even a little more pronounced. Put the neighbor's MAF back in. This time it did no good. The hesitation was exactly like it is with the new sensor, the old sensor, and now with the neighbor's sensor.

Checked MAF plug and as much of the wiring as possible. Found a splice on the signal wire at the ECU plug. Previous owner had spliced something in???? The splice looked good, though. But I got rid of it, and did a new splice (hook splice with solder; very clean). It changed nothing.

Changed fuel filter. Had the injectors cleaned and flow tested by Witchhunter in Seattle. Checked grounds. I'm getting a CEL, but there are no codes????

Hose to PCV "Y" fitting, from inlet tube to Y, has been removed, and that leg of the Y fitting capped. Maybe this is a problem?

Will run logs this weekend. But wanted people to know that I am experiencing the same thing with different gas, in a different part of the country.
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Old 08-14-2009, 07:10 PM   #21
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/\Nope... still have the issues here. I have my own thread that I keep updated as I replace things. I've replaced a lot. As soon as find a decent VF 39 I will be swapping turbo, TMIC & Injectors, and while I'm at it diging deeper into a solution while I'm elbow deep into the motor The only thread like this I have seen solved is when someone has a bad engine ground... other than that, we all stutter everywhere we go like that special kid in elementary school
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Old 08-14-2009, 08:06 PM   #22
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Well, damn. I'm going to re-ground the engine and transmission. Re-install the hose from the Y connector on the PCV to the inlet tube. And then run some logs to see what happens when if goes from closed to open and vice versa.

It runs great otherwise. Drove it 150 miles to check mileage without any boost (kept it below or on zero boost=65-70 mph). Mileage was 29.

At full out, banzai, crazy, any-cop-would-drool-to-catch-me-in-the-act, lots of redline or near redline, up and down hills and around 90 degree turns, it gets a solid 15-17 mpg.

No shudder or stutter in any of that driving. Just around town.
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Old 08-14-2009, 11:42 PM   #23
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Still having same issues as well.

I lowered the CL/OL throttle angle change to 3.6% and it seemed to help slightly for a couple of days. Once my tank went low, I got gas from another station and the symptoms are back once again. Today I feel was the worst pronounced hesitation in a couple weeks.

Ive reseated all my grounds (as well as adding more), resealed my vacuum lines, inlet, etc with zero effect. I have noticed that during this hesitation, my wideband sweeps fully rich to fully lean, over and over again until applying significant throttle change, or up shifting to the next gear.

I am thinking I am just going to buy a new OEM front O2 sensor, but am hesitant to replace it without being pretty sure its the problem ($240 ) Everything points to that as the problem, but I dont have any CELs and am not 100% sure.

When I get this hesitation, I feel like other drivers look at me like I dont know how to drive

Bump for this issue of death
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Old 08-15-2009, 03:01 AM   #24
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I replaced the front OEM O2 sensor with a new OEM sensor. I also changed the MAF sensor, also with a new OEM MAF sensor. Didn't help. You should be able to get a new OEM front O2 sensor from a dealer for $150. Or you can have my old O2 sensor; I'm pretty sure it's okay. It's an 02 WRX front O2 sensor, but I'm pretty sure it's the same as what is in your car. My EJ257 block is an 06. If you want to try a new MAF sensor, and an 02 WRX MAF sensor will work, I'll sell my old one, which is good as new and even cleaner, for $75. New OEM sensor cost me $204.

Soon as I finish re-grounding (the trans ground looked pretty bad), I'm going to run some logs 2000-3000 rpm, see what a professional tuner has to say.

It occurs to me that problems such as this is probably why God made grenades!
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Old 08-15-2009, 09:51 AM   #25
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Quote:
Originally Posted by 2xhighpsi View Post
Still having same issues as well.

I lowered the CL/OL throttle angle change to 3.6% and it seemed to help slightly for a couple of days. Once my tank went low, I got gas from another station and the symptoms are back once again. Today I feel was the worst pronounced hesitation in a couple weeks.

Ive reseated all my grounds (as well as adding more), resealed my vacuum lines, inlet, etc with zero effect. I have noticed that during this hesitation, my wideband sweeps fully rich to fully lean, over and over again until applying significant throttle change, or up shifting to the next gear.

I am thinking I am just going to buy a new OEM front O2 sensor, but am hesitant to replace it without being pretty sure its the problem ($240 ) Everything points to that as the problem, but I dont have any CELs and am not 100% sure.

When I get this hesitation, I feel like other drivers look at me like I dont know how to drive

Bump for this issue of death
I'm just throwing this out there ! could be a faulty drive by wire sensor ether the throttle body or the accelerator pedal sensor .
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