C1278 and two lean codes...
Thread Starter
AMP Racing
Joined: Aug 2006
Posts: 10,753
Likes: 588
From: Washington TWP NJ
2023 C5 of the Year Finalist - Modified
2017 C5 of Year Finalist
St. Jude Donor '09-'10-'11-'12
C1278 and two lean codes...
Installed a FAST 90 and NW 90mm TB
Car runs good in every phase but WOT.
I get 0171 & 0174 - Lean bank 1 & 2
and then get C1278 TCS inhibited by PCM
I tried to do the relearn process for the PCM and then went for a 40 mile drive. All was fine - no codes. So I drove onto the expressway and floored the accelerator pedal, at about 5000 rpm it happened again. Reduced engine power, service active handleing and the three codes came back.
Will the PCM learn it's way out of this, or should I just get it re-tuned?
I imagine it's lean because of the increased airflow from the 90/90. And for some reason it's triggering the TCS issue.
Are there any other tricks I can do to get it to work properly?
Thanks
Car runs good in every phase but WOT.
I get 0171 & 0174 - Lean bank 1 & 2
and then get C1278 TCS inhibited by PCM
I tried to do the relearn process for the PCM and then went for a 40 mile drive. All was fine - no codes. So I drove onto the expressway and floored the accelerator pedal, at about 5000 rpm it happened again. Reduced engine power, service active handleing and the three codes came back.
Will the PCM learn it's way out of this, or should I just get it re-tuned?
I imagine it's lean because of the increased airflow from the 90/90. And for some reason it's triggering the TCS issue.
Are there any other tricks I can do to get it to work properly?
Thanks
Last edited by C5 Pete; Nov 20, 2010 at 08:03 PM.
Thread Starter
AMP Racing
Joined: Aug 2006
Posts: 10,753
Likes: 588
From: Washington TWP NJ
2023 C5 of the Year Finalist - Modified
2017 C5 of Year Finalist
St. Jude Donor '09-'10-'11-'12
My first thought was an air leak somewhere. But I get both the Bank 1 and Bank 2 lean codes, so it seems to me perhaps it's just the increased airflow? Maybe the gaskets on both the right and left side didn't seat properly? I find it hard to believe that both sides are screwed up - though they certainly could be...
I'm still woriking on it.
The search continues...
I'm still woriking on it.
The search continues...
Pro
Joined: Nov 2005
Posts: 626
Likes: 0
From: Fresno CA
Try cleaning your MAF with a dedicated MAF cleaner. Also are you running a aftermarket CAI .
Thread Starter
AMP Racing
Joined: Aug 2006
Posts: 10,753
Likes: 588
From: Washington TWP NJ
2023 C5 of the Year Finalist - Modified
2017 C5 of Year Finalist
St. Jude Donor '09-'10-'11-'12
I have a vararam. It's been on for quite a while.
I cleaned the MAF during this install.
Still working on it.
Thx for the ideas.
I cleaned the MAF during this install.
Still working on it.
Thx for the ideas.
Pro
Joined: Nov 2005
Posts: 626
Likes: 0
From: Fresno CA
Someone here on the forum had a WizBang Gizmo that connected to the front of your throttle body and could be pressurized, this way you could detect for leaks in that system. I'm not totally sure how it all worked, but seemed cool.
Thread Starter
AMP Racing
Joined: Aug 2006
Posts: 10,753
Likes: 588
From: Washington TWP NJ
2023 C5 of the Year Finalist - Modified
2017 C5 of Year Finalist
St. Jude Donor '09-'10-'11-'12
I might do that. I'd take off the rockers and put a 4" adapter on the TB with an air guage and schrader valve...
Or just take it to Doug at ECS and let him fix my stuff...
Or just take it to Doug at ECS and let him fix my stuff...
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Thread Starter
AMP Racing
Joined: Aug 2006
Posts: 10,753
Likes: 588
From: Washington TWP NJ
2023 C5 of the Year Finalist - Modified
2017 C5 of Year Finalist
St. Jude Donor '09-'10-'11-'12
It is not currently on the stock tune. I am planning to get it re-tuned.
I was just wondering if the computer would do any adjustments. I was under the impression that it will do some minor adjustments and was looking to see if others had similiar codes that I have.
Doug@ECS will be getting a call this week.
I was just wondering if the computer would do any adjustments. I was under the impression that it will do some minor adjustments and was looking to see if others had similiar codes that I have.
Doug@ECS will be getting a call this week.
Drifting
Joined: Jan 2004
Posts: 1,419
Likes: 6
From: Alamosa CO
Pete,
Get it back to Doug at ECS ASAP. That 1278 code haunted me for a while after my engine swap and actually after the initial power tuning done by a real pro on a Dynojet. It's definitely caused by the increased airflow of the 90/90 set-up. There are some settings that need to be changed in the MAF tables and it will go away and not come back. I'll bet good money that Doug knows exactly what it is and what to do to correct it!
Jimbo
Get it back to Doug at ECS ASAP. That 1278 code haunted me for a while after my engine swap and actually after the initial power tuning done by a real pro on a Dynojet. It's definitely caused by the increased airflow of the 90/90 set-up. There are some settings that need to be changed in the MAF tables and it will go away and not come back. I'll bet good money that Doug knows exactly what it is and what to do to correct it!
Jimbo
Thread Starter
AMP Racing
Joined: Aug 2006
Posts: 10,753
Likes: 588
From: Washington TWP NJ
2023 C5 of the Year Finalist - Modified
2017 C5 of Year Finalist
St. Jude Donor '09-'10-'11-'12
My first thought was an air leak somewhere. But I get both the Bank 1 and Bank 2 lean codes, so it seems to me perhaps it's just the increased airflow? Maybe the gaskets on both the right and left side didn't seat properly? I find it hard to believe that both sides are screwed up - though they certainly could be...
I'm still woriking on it.
The search continues...
I'm still woriking on it.
The search continues...
I'm not sure why I didnt just put new gaskets on when I did the initial install...
New manifold and TB gaskets - lean problem solved.
Took it out for a spirited drive and thought all was well with my ride. Then after several max effort accelerations it went into limp mode - 0068 and 1278...
I changed out the TPS and have not had a chance to drive it yet - perhaps this will fix it?
Regardless, I have talked to Doug, and if I cant get it, he'll fix it up right...
