46 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHCar is running very rich.
Reported or suspected cause
defect
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
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Reported cause · Original poster
So was able to go back to the shop and argue the delamination was caused by a defect.
Leading evidence: 'defect' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'defect' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Adjust fuel trims' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed · Original poster
Car did run lean then I cleaned the maf sensor and that went away.
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Performed · outcome unconfirmed
Pull the injectors and get them tested/cleaned etc.
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Suggestion
If your vehicle is running rich due to a mechanical issue, your 02 sensors should cause ECM to adjust fuel trims to a negative number.
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Suggestion
I bought the Joe Gibbs Driven Injector Defender, recommended by LN engineering to clean the injectors.
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46 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T024951Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hello all, my car has made some serious progression from the first time I posted on this page. It�s been repainted and now just a few minor things and it will be rock solid.
My poor girl stalls out in the morning many many times before actually starting up, and when she starts up, she sputter and dies. Then after about 5 to 6 times she starts up, has a rough idle and once it gets warm then she�s okay. Live data is showing that short term fuel trim for bank 2 sensor 2 is reading 99.0. Car does throw codes P1126 and P300-P306. CEL comes and goes on it�s own. Car did run lean then I cleaned the maf sensor and that went away. Car often smells like gasoline on start up as well. All spark plugs and coils are new, oil is fresh as well. Anyone have a clue? Here are before, during, and after pics of my baby girl now.
You could have a stuck fuel injector, which is not good for these engines. I bought the Joe Gibbs Driven Injector Defender, recommended by LN engineering to clean the injectors. Or maybe I drank the cool-aide, but sounds reasonable enough to me.
Don't drive it rich, you'll wash the bores and things will go south from there...
Pull the injectors and get them tested/cleaned etc. They should flag if you have any bad ones.
No I haven�t. Car only has 40k. Wanted to make sure there wasn�t a vacuum leak before I start buying things I don�t need. Cause the sputtering and dying on cold start 100% seems like a vacuum leak. Cause when rubber gets warm it could plug the leak. Would you maybe know of a vacuum system diagram so I could smoke it?
It was painted previously, don�t know the reason. So was able to go back to the shop and argue the delamination was caused by a defect. And the shop reached out to the insurance and got it approved, because they give lifetime warranties with their paint jobs.. Didn�t even have to pay the deductible.
Right, the PO would have got THOUSANDS MORE if they just did what you did. I feel like you had a 1-1,000,000 chance and you got it. Now I feel like I should look for some cars with messed up paint that I can get warranty work done on hahahaha. Did they fight you or was it simple?
Unless my memory is slipping, or I�m confusing this with another delaminated paint car, I think he got the car as a gift from his mother.
It looks awesome, congratulations!
Wow, that does look nice!
I wouldn't bother cleaning the injectors, I would replace them.
Warehouse33 had some of the best prices on injectors last time I looked.
Using the 10% off code(rennlist) will make them even more affordable.
Under $175 for 6 brand new injectors for 996.2.
I assume the 996.1 are just as affordable.
You are correct. Was given to me not running at all after sitting in the driveway for 5 or 6 years uncovered. They faught a bit because the company that did it was bought by service king. But since it was lifetime they had to pick up the warranty slack.
Alex - popping in to say the car looks great, man. I'm glad you're having fun with it.
I wish I could help with your issue definitively. I would absolutely follow up on the injectors so long as your car isn't holding codes for MAF, O2, air intake stuff that could be throwing off fuel mix due to the ecu being confused. Your car had sat for some time... perhaps they really are just a little gummed up. I think you should pick up a bottle of that Joe Gibbs in the meantime, while you troubleshoot the issue, and see for the fun of it. It's pretty cheap.
Just filled up and threw a bottle in the tank, car loved it. Between that and the Techron, injectors should be clean. When the rain clears up or probably sometime in the next week or so I�m gonna drop the engine a little bit and check them out. I think I found a vacuum leak earlier but I�m not too sure. I have to wait and see till tomorrow morning after the car sits overnight. Thanks for the compliment, she deserves it right now.
Hmmm. Few things...
Most automakers limit fuel trims. I find it hard to believe Porsche engineers would cap fuel trims at +/-99%.
If your vehicle is running rich due to a mechanical issue, your 02 sensors should cause ECM to adjust fuel trims to a negative number.
I wouldn't drive the vehicle, you'll damage your cats. I think your diagnostic hardware is suspect; what are you using?
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So yesterday. My car threw codes for the mass air flow sensor. And now it starts right up and doesn�t die when I start it. Getting car smoked next week to see if there�s a vacuum leak, but now I�m lost. When MAF wasn�t throwing codes it was stalling and now it�s not. Would that be causing all the problems?
