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08-30-2002, 08:12 AM
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Registered Member
Join Date: Sep 2001
Location: Avon, CO, USA
Posts: 63
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Fuel system is to lean
I have a pretty much stock 1989 5.0 LX Converible. Accept for Mac Headers, X-pipe and a Hyper Tech Chip. I am getting 41 and 91 codes when running a KOER test. The car stumbles. The car has a new map sensor, fuel pump, O2 sensors, and EEC IV. My mass air flow seems to pass its test. The fuel pressure under load is 39. Under load for a while and then release indicates 39 and can drop down to 35. What do you guys think?
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