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Thread: 89 F-150 5.0/302 Large Quantity of Unburned Fuel in Exhaust System...need some help
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10-25-2007, 12:19 PM   #6 (permalink)
Motorhead
 
Join Date: Jan 2001
Location: Pullman, WA
Posts: 2,449
Re: 89 F-150 5.0/302 Large Quantity of Unburned Fuel in Exhaust System...need some he
My guess would be that your #3 cylinder is not firing, causing excess oxygen in the exhaust, making the O2 sensor read lean, and making the computer dump tons of extra fule into the GOOD cylinders to compensate. Just a guess, I could be way off, I try to avoid working on EFI stuff .
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