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Old 03-10-2017, 10:57 PM   #1
one4house
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Join Date: Nov 2010
Location: Sherman, tx
Default DAM at Zero, Fine and Feedback Knock Off the Chart

Edit: 03 WRX Wagon. Forgot to mention that.

The title says it all. Recent JDM swap that was running fine until a hour ago.Last night I put new coils on the driver's side 2 cylinders. This afternoon after work I put a new coolant hose from the overflow tank to the turbo.

I am stock on the engine, Cobb OTS Stage two with Invidia cattlesss downpipe, STI Catless up pipe. Stock exhaust from the downpipe back.+

I did fill up at an unfamiliar gas station last night. I put in about 8 gallons of 93, so almost a full tank. I had about 70 miles on this tank once the DAM drop and timing pull started. I was driving in traffic and it started at cruise driving. Nothing near redline.

Last night I did some country road pulls and all was well. Today it ran great to and from work and around town.

I have included two logs where I went to my usual station and got 4 gallons of 93 to top it back off. I did add a 1/2 can of Berryman's injector cleaner to this tank this morning. I have added it to a tank before with no issues.

I want to run out this tank, but it is pulling timing pretty extreme. I just don't want to hurt the newly swapped engine. Taking tips and tricks now.



http://www.one4house.com/images/GasRun.xls

http://www.one4house.com/images/GasRun2.xls
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Old 03-10-2017, 10:58 PM   #2
one4house
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I forgot to mention that I detuned to the Cobb stage 1, 93 octane map as soon as I started getting knock detection. Just to be safe.

1. Could it be a bad knock sensor? What are the signs?

2 I know bad gas, but would it pull that much timing and drop the DAM with bad gas?
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Old 03-11-2017, 01:24 AM   #3
Sweetsixteam
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Join Date: Aug 2015
Chapter/Region: VIC
Location: Vancouver, BC
Vehicle:
1999 Forester S/Tb
Silver, Spec A (JDM)

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I had a knock sensor recently go bad, it would throw CEL's and pull mad amounts of timing. I got it to flash code 22 knock sensor. Replaced it and found a hairline crack in it and it was probably original. Easy fix for me, although it had me puzzled for a loong time.
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Old 03-11-2017, 03:45 PM   #4
andyfloyd
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2002 wrx
silver

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Personally on my 2002 wrx I get -6.33 @ 1500 rpm all the time. On WOT pulls I get ZERO feedback knock learn. Ive chalked mine up to a random rattle under the hood and my DAM is still 16. Try resetting the ECU and see what happens. I do that to mine and eventually it learns back the knock @ 1500 rpm. Is yours pulling this on WOT pulls?
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Old 03-11-2017, 04:14 PM   #5
one4house
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This drop in DAM and timing correction happens as soon as you touch the throttle. I don't dare get anywhere near WOT. The DAM drops within the first 3000 rpm and the knock detection goes wild.

I have no CEL, I have no odd noise and the car has 0.00 timing retard at cruising speed. When at idle, I have no noticeable noise. As I am under the hood and give it throttle there is no noise. The car runs smooth.

Since I have put the engine in last weekend, I have seen 4.22 correction a few times, but I usually see 0.00 on both learn and feedback 90% of the time. Most timing changes come at dead-stop accelerations where you would expect it to happen.

I think it is either a sensor or gas problem. Pulling 11* timing so quickly would be noisy AF if I had a spun bearing or something mechanical. I put a new knock sensor on. I will give it a test run and report back. If it is fuel related, it may be a while before I know something for sure.
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Old 03-11-2017, 04:33 PM   #6
andyfloyd
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it sounds like what my car experiences. Literally when I back out of my driveway and blip the throttle i get -6.33 FBKC. Once I start moving it literally doesnt get any knock and on WOT pulls i get zero FBKC. I dunno why my car registers all this knock during a simple throttle blip but actual driving it does fine. It annoys me too but its not knocking under load which would be more concerning.
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Old 03-12-2017, 01:40 PM   #7
JWX
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how many miles do you have on your engine? Mine is doing this same thing, but no extra noise, and runs great with no knock or feedback knock, or fine knock learning under boost. i have 180k on my set up, with majority of those miles being tuned with 20ish lbs of boost. I'm thinking its just getting worn out, and its probably piston slap.
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Old 03-13-2017, 12:06 PM   #8
one4house
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I was just going to update, it looks like I had a manifold bolt (driver's side, closest to the knock sensor) that I forgot to tighten. I am 90% certain that this is rattling at low rpm and causing the knock detection issue.

Unfortunately, when checking other things, I broke one of the barbs off of the turbo inlet hose. Now I have to install another inlet hose before I can make sure this fixes it.

I found me a turbo inlet over the weekend and plan on installing it tonight and tomorrow.

Let this be a lesson, kids. Always tighten all the bolts topside or you will cause yourself avoidable issues.

http://youtu.be/cnTij041QAc

Last edited by one4house; 03-13-2017 at 12:12 PM.
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Old 07-03-2020, 11:48 AM   #9
2018wrxstijaden
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Did you ever figure it out ?
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Old 07-03-2020, 08:00 PM   #10
NicMonte
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Join Date: Dec 2017
Location: Omaha Ne
Vehicle:
2002 Impreza wrx
Black

Default DAM at Zero, Fine and Feedback Knock Off the Chart

Itís jdm, different compression, unless Iím mistaken? The Cobb maps for your application are not compatible.

Get a tune.
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Old 01-16-2021, 07:11 PM   #11
Blob05
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Member#: 516808
Join Date: Jul 2020
Location: Northern Nevada
Vehicle:
2005 Impreza wrx
Silver

Default Also having spiked fbk and fbkl

And agree with the fact that with a jdm motor using the Cobb ap is not compatible. Very likely your issue.

Hoping mine is tank of bad gas, terrifying when your dam drops to zero
)8 0
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