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post #1 of 4 (permalink) Old 07-02-14, 08:14 PM Thread Starter
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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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post #2 of 4 (permalink) Old 07-03-14, 09:22 PM
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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?

Ever notice that there's so many high performance parts available for GM products?

Did you ever think that maybe they NEED them?
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post #3 of 4 (permalink) Old 07-05-14, 06:50 AM Thread Starter
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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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post #4 of 4 (permalink) Old 07-05-14, 08:08 AM
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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.

Ever notice that there's so many high performance parts available for GM products?

Did you ever think that maybe they NEED them?
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