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Running Rich


Tom

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My car ('94 850 wagon, auto, N/A, 160K) stopped running a couple of days ago after years of running well. The code I got, 1-2-1 sent me to the air mass sensor so I replaced that. Now the car runs and that error code is gone. But it runs very rich, nearly stalls, and throws out a single code 5-1-2 "Long term fuel trim too rich". Has anyone experienced this? Any wisdom would be greatly appreciated.

Tom

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I could be way off here, but I think your E.C.U needs to learn your new MAF sensor. I just put a downpipe and new CAT on and I was getting all sorts of codes(That I never had before). But after I unhooked the battery and let the E.C.U reset everything seems fine now and my MPG's are returning to normal.

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I could be way off here, but I think your E.C.U needs to learn your new MAF sensor. I just put a downpipe and new CAT on and I was getting all sorts of codes(That I never had before). But after I unhooked the battery and let the E.C.U reset everything seems fine now and my MPG's are returning to normal.

Great thought ... I tried this but it didn't work. Anybody know how to test things so that I can get working again by replacing only bad expensive parts, but not the good expensive parts?

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Definitely sounds like a big vacuum leak. Check the little vacuum elbow that goes in to the intake manifold on the passenger side. It's kinda tough to spot at first, but try looking with a flashlight.

Thanks Sean - my car doesn't have that particular vacuum elbow, but I think you've sent me in the right direction. When I pulled the vacuum line off the fuel pressure regular, gasoline came out. So the regular has a hole in the diaphragm. That means that the regulator is not referencing to manifold vacuum which will make it run rich. The car also may be getting an extra gulp of fuel through that vacuum line, which will make it run even richer. So I've ordered another regular. We'll see how well that works.

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