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Old 07-02-2014, 20:14   #1 (permalink)
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Running too rich, need help please!

Hello. I just bought a 90 E150, 4.9 EFI, automatic. The truck runs incredibly "eye burning" rich. I replaced the cap, rotor, plugs, wires and temp sensor at the thermostat housing. I also cleaned the IAC. I can't figure out why it runs so rich / extremely poor mileage. Also stumbles when accelrating from idle. Would really appreciate any advice. Thanks.
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Old 07-03-2014, 21:22   #2 (permalink)
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Re: Running too rich, need help please!

The mileage and stumbling is probably due to the richness. Any idea what the fuel rail pressure is?
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Old 07-05-2014, 06:50   #3 (permalink)
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Re: Running too rich, need help please!

Thanks for your reply! I don't know the fuel rail pressure. If I can't fabricate a guage, I'll have to wait to borrow one. I have replaced the fuel filter and some vacuum lines. I also removed the air charge sensor, cleaned it , tested it and re-installed it. Thought I would replace the TPS with a known good one I have, but feared the screws will break off in the throttle body. I calculate 8-9 mpg right now.
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Old 07-05-2014, 08:08   #4 (permalink)
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Re: Running too rich, need help please!

Is it tossing any codes? The O2 sensor could be reading low which would make the engine try to adjust to a lean burn.
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