Rebuilt 302 idle problem
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Joined: Oct 2004
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From: Marana, AZ
Rebuilt 302 idle problem
Besides having an overheating problem with this rebuilt 302, I seem to be having a problem with the idle as well. If I start the truck and don't touch the gas pedal it will idle fine right about 750 rpms. When I go to accelerate it and hold it at 2000 rpms for the cam break in it runs smooth as glass, but the minute I let go of the pedal it stalls. If I let loose of the pedal real softly and slowly bring the rpms down and then let go of the pedal it will hunt for a second and then idle back at 750 rpms with a little hunting.
Now I did cut off the muffler and I am only running the 2 cats for an exhaust right now, would that be the cause of the idle problem?
Now I did cut off the muffler and I am only running the 2 cats for an exhaust right now, would that be the cause of the idle problem?
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Joined: Sep 2005
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From: Kiefer, Northeastern Okla
Sorry, been busy. 17 to 22 with a steady needle, warm engine in park or neutral, normal idle. A low steady needle usually indicates intake or carb gasket leak. Timing can also effect vac readings. It sounds like something simple, at least it picks back up and idles, right? With a vaccum leak, the carb's not recieving a vac "signal" and just won't "feed" the motor until vac builds back up and pulls fuel into the plenum.
Another way to tell is with engine running, spray starting fluid around the intake and carb gaskets, and if you've got a leak, the engine idle will go way up. Just a thought, I could be way off, but I prefer to start with the simple things first.
Pete
On edit: Sheesh- it's EFI. Anyway, it could still be an intake or vac line leak.
Another way to tell is with engine running, spray starting fluid around the intake and carb gaskets, and if you've got a leak, the engine idle will go way up. Just a thought, I could be way off, but I prefer to start with the simple things first.
Pete
On edit: Sheesh- it's EFI. Anyway, it could still be an intake or vac line leak.
Last edited by petes79f150; Dec 24, 2006 at 05:43 PM.
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Joined: Oct 2004
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From: Marana, AZ
Originally Posted by petes79f150
On edit: Sheesh- it's EFI. Anyway, it could still be an intake or vac line leak.
Well if it was an intake or plenum leak I will never know. I had to rip her back apart because I had a dead cylinder in #7. But thanks for the tip!
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BigRedWeather
1994.5 - 1997 7.3L Power Stroke Diesel
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