[JFP in PA]

Originally Posted by jdraupp

Guys, I've been doing a lot of my own diagnosis and think I have the issue with my box cornered, but would love to get some advice to make sure I'm on the right track.

Had 1130 and 1128 codes since I bought the car. Thought for sure it was AOS, had the white smoke and everything. AOS replaced, codes came back. The car does this odd thing at a cold startup that sounds like it's going to stall. The only way I can describe it is when the car is on "choke" it runs fine, and then when it switches to run after startup, it bucks, rpm idle bounces like its going to stall for maybe 10 seconds, then it corrects itself and runs fine. Gas mileage seems low, so I know its running rich, and the codes confirm this. I pulled the plug on the MAF and started it and the same idle issue happened with the MAF disconnected so I don't think its an MAF issue. I did clean the MAF and did a new air filter recently and the codes came back after driving it about 100 miles.

Thoughts on this? I'm going to take it to my indy to get it leak tested, but I'm hoping I'm on the right track and not just throwing money away for nothing. 2002 Base Tip if that matters to anyone. Thanks in advance for the advice.

P1128 and P1130:

These codes indicate that the O2 sensors on each bank have reached their enrichment limits; possible causes:

• Intake is leaking
• Fuel pressure is too low
• Injectors are carbonized or otherwise contaminated
• Fuel delivery volume is low