2007 running rich on bank 2
- Thread starter 03GMCYukonXL
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03GMCYukonXL
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So update. This issue went away with warmer weather. I thought maybe the problem fixed itself lol. However, now with the cooling weather, the issue has returned. Now the real funny thing is, it seems to do it the worst between 50 and 70 degrees. When it's real cold, it isn't as bad, but still present. In the heat it's never present.
It's only at idle, or once it's been under load at speed and then I let it coast. As in climbing a hill and then coasting down. Once I give it throttle and it's under load again, the light goes out. So it makes sense what was previously mentioned about a leaking gasket causing a lean condition and the compensation from the ecu puts it in a rich condition once the rpms are down. I actually have a set of metal intake gaskets that came with my Texas speed DoD delete kit. I'll swap these out in the coming weeks and see if that helps
It's only at idle, or once it's been under load at speed and then I let it coast. As in climbing a hill and then coasting down. Once I give it throttle and it's under load again, the light goes out. So it makes sense what was previously mentioned about a leaking gasket causing a lean condition and the compensation from the ecu puts it in a rich condition once the rpms are down. I actually have a set of metal intake gaskets that came with my Texas speed DoD delete kit. I'll swap these out in the coming weeks and see if that helps
Discodisco
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You really need to get fuel trims before you can do anything, since it’s only on one bank it’s somewhat isolates what you need to look at but it could be anything from a vacuum leak to an injector to a o2 sensor.
Discodisco
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Yeah an exhaust manifold or gasket leak could certainly introduce post combustion air into the exhaust before the sensor making it think it’s running lean and richening it up.
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03GMCYukonXL
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Funny thing is, I have a popped exhaust manifold bolt on bank one. Bank 2 bolts are fine. If it was a bad 02, wouldn't it throw a code? The service stabilitrak light literally only comes on at idle or after I've been driving under load and then let it coast.
Discodisco
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you got an oil pressure issue my friend, im willing to bet that you also have a p0111 stored for the variable cam timing. when your sitting at idle oil pressure is probably low and when you come off a heavy load to no throttle it dips too.
To further answer your question though, its hard to say without fuel trims, the PCM is designed to set a fault once a certain value is exceeded in a binary matter, simple yes or no, the fuel trims though can vary anywhere from -9% to + 9% (roughly) without setting a fault.
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03GMCYukonXL
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You may be correct except for one thing. I don't have variable cam timing but I do have an oil pressure issue that has been present since I did the DoD delete. I'll get the p0521 code sometimes. The oil gauge goes to 0 and gives me the warning and when I give it a bit of gas it goes back up and stays that way. That too only comes about when the weather is less hot. That only happens every now and then. The service stabilitrak light and CEL for p)175 happens daily. I was told that I have the oil pressure issue because I didn't change the oil pump to a low volume high pressure one.
Why would an oil pressure issue cause a rich condition in one bank?
I have a file of the truck running at idle and the stabilitrak light comes on at some point and I give it some throttle and it goes away. Problem is, it won't let me attach the file here.
**EDIT** Side note, I have a flex fuel and was told to look at my alcohol percentage and couldn't find it, but I did discover that the flex fuel was disabled. I did not to it.
You can upload a video to a hosting site like YouTube, and post a link to it here.
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03GMCYukonXL
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It's a hp tuners file not a video.
