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Old 10-05-2012, 08:13 PM   #1
OC_Nooby
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Member#: 311781
Join Date: Feb 2012
Location: Canada
Vehicle:
2003 WRX w STI V8

Default Rich Idle above 85C, Perfect Below 85C?

This is just what I've done before figuring out what the root problem was, any help would be great! (Post 3 is where I found out my issue)

OK, this is bothering me.

I unhooked my o2 sensor via opensource so its running in OL all the time. I started off with a 16 A/F when the car was fully warmed up and idling. I then proceeded to scale my injectors (1100cc original, slowly decreased value) and got the car to 14.2 A/F. Alright so I was getting closer to 14.7. Now I continued to scale my injectors (increase value to lean). Fired up the car and boom. 11.5 A/F. Reverted back my injector scale and nothing, still 11.5 at 800 rpms. If you gave it gas and maintained the throttle position (1100rpms) the car would be fine. 14.7ish A/F.

This was only decreasing the injector cc scale.

This doesn't happen all the time. Its weird and random. Is one fuel injector going to town ie stuck open?

Come to think about it, my car has been doing this for a while but the o2 sensor was compensating as I see it going for 11.5 to 14.7. I also noticed it going rich during a WOT then letting the car cost to idle.

Ideas?
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Last edited by OC_Nooby; 10-07-2012 at 05:39 PM.
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Old 10-06-2012, 08:04 PM   #2
OC_Nooby
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Join Date: Feb 2012
Location: Canada
Vehicle:
2003 WRX w STI V8

Default

Stock MAF Housing/Air Box.
FIC 1100cc Injectors.

I just don't understand the randomness.

I suppose I can use a stethoscope and see if the injectors are sticking or sound different. Get that out of the way.

Update: I've made some changes to my idle via Warm Up Enrichment. The car idles very nice 14.8 A/F for a majority of the time, once it reaches 95c (coolant temp) the A/F drops to around 14.5. Not bad considering I have no o2 plugged in. So I was watching the car warm up for a solid 20 minutes. No issues, was good. Very happy with myself. Decided to shut the car off and restart it. Still running nicely. Awesome. Did this 4 times.

Well now on the 5th time. BAM 11.5 A/F. Same warmed up motor, nothing changed, nothing. Like seriously nothing changed. It just went god damn rich for no reason.

I busted out my stethoscope and touched the metal bracket of the injector (these brackets don't make contact with any part of the motor). I herd every injector tick. Nothing out of whack. My mind = BLOWN. It took a solid 5 minutes or so for the A/F to go back up, but to around the 14.0 A/F mark. After that, I decided to restart the car again and it went pig rich 11.5 A/F again. I reved the motor to empty the fuel and shut the car off before it went back to being pig rich.

Fuel pressure at start-up is 3.3 bars then after 10 seconds it drops to 2.9 bars and maintains said pressure. The fuel pressure is identical when I'm pig rich and when its running a solid idle. MAF voltage/g's are the same in both situations.

I should have logged this but I highly doubt this is it. Highly. Since the latency is voltage dependent maybe for some odd, retarded reason my battery drops below the 14v mark and this causes the latency to switch?

Last edited by OC_Nooby; 10-07-2012 at 01:26 PM.
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Old 10-07-2012, 03:24 PM   #3
OC_Nooby
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2003 WRX w STI V8

Default

OK, so I took some logs. Rich Idle vs Proper Idle there was no difference in logs. MAF V/G's, Latency, Battery Voltage, DC of injector, RPM, Vacuum, Fuel Pressure, Total Timing, Engine Load, TPS V/ Angle. All matched, just dumping a crap ton of fuel.

So I decided to unplug my MAF, car stalled. Then I decided to unplug the IACV (03 wrx), car did not like that (makes sense).

Lastly I unplugged the TPS, the car immediately leaned out to ~14.7 A/F. My gas pedal is a little sticky at times (when the car is on, not sticky when its off). I think it leaned out because the TPS readings went to 0. So it might be fooling the actual problem. I'll swap out the TPS and see what happens.

Update: Replaced TPS, issue persists.Running around in a full circle achieved. Anything I can try out?

Another Update, possibly a break through...If the car is warmer then 85C my A/F slowly richens but to ~14.3 A/F. Now if I start the car when its warmer then 85c it runs rich at 11.5 A/F. If I let the car cool down to 80C it will fire up and be around ~15 A/F but will start to richen afterwards as the coolant temp warms up. I unplugged the coolant sensor (didn't do anything) thought it might be causing issues but it reads properly and matches my coolant temp gauge.

So why does the A/F incrementally go richer as the coolant temp rises above 85c and why If I start the car above 85C that its pig rich at 11.5 A/F?

Another update: I tried to fool around with Fuelling - Cranking and CL Fuelling Target Compensation. Nothing helped.

Last edited by OC_Nooby; 10-07-2012 at 06:59 PM.
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Old 10-09-2012, 01:59 AM   #4
OC_Nooby
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Member#: 311781
Join Date: Feb 2012
Location: Canada
Vehicle:
2003 WRX w STI V8

Default

Apparently this is my problem:

http://www.romraider.com/forum/viewt...hp?f=25&t=8566

Sadly, no fix for the 16 bit ecu. So i'll have to live with it.
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