Runs rich
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Junior User
Joined: Aug 2005
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Runs rich
Seems like when I fire up the truck it runs ruff and black smoke out of the tail pipes. After a while it smooths out. Almost could say it seems to be missing at first fire up. Is it possible there is a leaky injector? Also sometimes engine stalls and you need to floor gas pedal to get truck to start. Also seems like much black smoke. The truck has a new TPS and I cleaned the IAC. It also has a new temp sensor for the computer. It has a cam but is not agressive as it is a 92 302 with a maps setup.
Freshman User
Joined: Nov 2006
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ive heard of bad fpr (fuel pressure regulator) causing black smoke to come out of tailpipes.
im pretty sure u can test it by pulling the vacuum line from it and turn the key to the on position. if it leaks out any fuel it is bad.
im pretty sure u can test it by pulling the vacuum line from it and turn the key to the on position. if it leaks out any fuel it is bad.
Last edited by pmipmatt73; Jul 18, 2007 at 12:22 AM.
Junior User
Joined: Jun 2007
Posts: 82
Likes: 1
From: Pennsylvania
My 89 did the same thing Flairside. I tested the fuel pressure at the rail, and at idle, she was pushing 100+ lbs. She also was blowing black smoke, especially when I revved her up to "clear her throat".
I changed the FPR, fixed the prob right away. Check your fuel pressure at the rail.
Hope this helps......
I changed the FPR, fixed the prob right away. Check your fuel pressure at the rail.
Hope this helps......
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