Tom Posted October 27, 2006 Report Share Posted October 27, 2006 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 Link to comment Share on other sites More sharing options...
azinwa Posted October 27, 2006 Report Share Posted October 27, 2006 Check for leaks between the MAF and the Throttle BodyBert Link to comment Share on other sites More sharing options...
jays850 Posted October 28, 2006 Report Share Posted October 28, 2006 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. Link to comment Share on other sites More sharing options...
Tom Posted October 28, 2006 Author Report Share Posted October 28, 2006 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? Link to comment Share on other sites More sharing options...
WhiteT5 Posted October 29, 2006 Report Share Posted October 29, 2006 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. Link to comment Share on other sites More sharing options...
Guest Guest Posted October 29, 2006 Report Share Posted October 29, 2006 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. Link to comment Share on other sites More sharing options...
Tom Posted October 29, 2006 Author Report Share Posted October 29, 2006 Oops - forgot to log in. That last post was me .Tom Link to comment Share on other sites More sharing options...
Chopper Posted October 30, 2006 Report Share Posted October 30, 2006 Vaccum leaks and fuel pressure regulator would both be prime causes. It could be a leak anywhere, not just an elbow. Link to comment Share on other sites More sharing options...
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