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Old 06-29-2011, 02:41 PM   #1
jdubbs_wrx
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Default HORRIBLE knock with Cobb Stage 1 Map!!!

I've been experiencing some terrible knocking on a Cobb Stage 1 91 Oct map. Running Shell 91 (no ethanol). Car runs fine, but heard VERY audible pinging at 5k-6.5k rpm so I decided to log it.

2004 WRX, Cobb Stage 1 91 octane tune. Only mods are a 3" Cobb catback and a K&N panel filter.

3rd gear
https://spreadsheets.google.com/spre...=0&output=html
I have some more logs but they're the same or worse.

Running scary lean.

- Changed K&N filter to regular panel filter, cleaned MAF (No change in logs)
- Ran 94 octane on 91 tune still (Some minor improvements in logs)
- Changed fuel filter (HUGE improvements, NO feedback knock, IAM (DAM) stays at 15 instead of dropping to 4, but still have lots of fine learning knock)

Logs after ALL of the above changes...
https://spreadsheets.google.com/spre...thkey=CIS4tc8C

https://spreadsheets.google.com/spre...thkey=CPSC958G

https://spreadsheets.google.com/spre...thkey=CNyE3L4B

Still running very lean, with lots of fine learning knock!!

150km (not miles) on the car. Plugs changed at 96km scheduled maintenance. Stock up-pipe, downpipe.

It's looking like it's the Cobb OTS map at this point. I've sent my Accessport in for warranty repair so I can't even flash back to stock to find out for sure until I get it back.

Help!
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Old 06-29-2011, 03:12 PM   #2
wrxdrvr
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Go to a different gas station...
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Old 06-29-2011, 03:19 PM   #3
jdubbs_wrx
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Quote:
Originally Posted by wrxdrvr View Post
Go to a different gas station...
I thought it was quite clear from my post that I did that.

Just to clarify, I used Shell 91 always.

Since then, I'm on Petro Canada Ultra 94. We don't have another source of 94. Once this tank is dry, I will try Petro 91.
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Old 06-29-2011, 04:29 PM   #4
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Quote:
Originally Posted by jdubbs_wrx View Post
Canada
Theres your problem
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Old 06-29-2011, 04:30 PM   #5
sanguines
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Quote:
Originally Posted by b1aze
Theres your problem
Blame Canada!
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Old 06-29-2011, 11:33 PM   #6
project_skyline
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Have you checked for air leaks in the system?
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Old 06-30-2011, 12:18 AM   #7
jdubbs_wrx
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Originally Posted by project_skyline View Post
Have you checked for air leaks in the system?

Yes but I'll check again everywhere. I pulled off the intercooler and checked the turbo inlet as best I could without taking it off. I'll check all vacuum lines again
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Old 06-30-2011, 12:24 AM   #8
Turn in Concepts
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How are you checking for leaks? pressure test or just visual?
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Old 06-30-2011, 09:16 AM   #9
Cobb Tuning
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Hi there. Sorry for the troubles you've been having.

Your MAF readings look low. Unless you are at high altitude, I would start there. The MAF sensor could just be bad. I would start by swapping it out as a test from another WRX, if you can. The MAF sensor is how the ECU determines airflow and if it is underreporting airflow, you will run lean.

The OTS map itself will not cause you to run lean. The map is very deterministic about fueling. If one person were to run lean due to the map, every person using that map would run lean.

Also log A/F Learning #1 A, B, C, D. We need to see what your fuel trims look like after a bit of driving.

Bill
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Old 06-30-2011, 02:27 PM   #10
jdubbs_wrx
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Quote:
Originally Posted by Turn in Concepts View Post
How are you checking for leaks? pressure test or just visual?
Just visual at this point.


Quote:
Originally Posted by Cobb Tuning View Post
Hi there. Sorry for the troubles you've been having.

Your MAF readings look low. Unless you are at high altitude, I would start there. The MAF sensor could just be bad. I would start by swapping it out as a test from another WRX, if you can. The MAF sensor is how the ECU determines airflow and if it is underreporting airflow, you will run lean.

The OTS map itself will not cause you to run lean. The map is very deterministic about fueling. If one person were to run lean due to the map, every person using that map would run lean.

Also log A/F Learning #1 A, B, C, D. We need to see what your fuel trims look like after a bit of driving.

Bill
No I'm not at high altitude. I cleaned the MAF the other day but I will swap MAF's with a friend today and report back here with new logs. That makes sense about the OTS map causing everyone to have the same scenario, but it's only my car.

Thanks for your help Bill
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Old 06-30-2011, 03:13 PM   #11
JBmeth007
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Any mods recently? Did this just start happening or occur over a bit of time?

Stock bypass valve? Plunger type? Diaphragm? Atmospheric

How long have you been running the map for? DAM=?
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Old 06-30-2011, 04:08 PM   #12
Phatron
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Quote:
Originally Posted by jdubbs_wrx View Post
Just visual at this point.
this cracks me up when people tell me this.
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Old 06-30-2011, 05:18 PM   #13
jdubbs_wrx
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Quote:
Originally Posted by Phatron View Post
this cracks me up when people tell me this.
I'm glad it does, "CEO". If I took my car to your shop I would've wasted time and money for no reason checking for leaks. I guess you have to make money somehow.




CAR IS NOW FIXED!!!

Anyways, for the people that actually helped out (Bill and others). I swapped my MAF today with a buddy's WRX, car ran better than ever. NO knock, IAM stayed at 16, not pulling timing. Cleaned my old MAF, still knocked horribly. Went to a JDM place to buy a MAF for $100 (not about to spend $400 at Subaru unless I absolutely have to). He let me log the car with the new MAF before I bought it. IAM at 16, not pulling timing, no knock whatsoever. Feedback knock and fine learning all 0's.

Thanks again to the people that actually helped out.


FYI Canada sends most of our gas from the oil sands to the States anyways
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Old 06-30-2011, 05:26 PM   #14
Phatron
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I didnt mean for that comment to come off like it did. Sorry.

The fact is you can only see about 25% of possible leak areas. The only type of leaks you can really find without pressurizing the system are leaks from loose hose clamps.

Glad you got it all sorted.
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Old 07-10-2011, 12:55 AM   #15
ricky0418
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octane booster!
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Old 07-10-2011, 08:55 AM   #16
ms6ftw
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you should, go back to stock map, until you upgrade your dp, then run stage 2
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