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Old 06-16-2006, 09:19 AM   #1 (permalink)
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High idle on 350 Vortec

I put a 5.7L Vortec in my FJ40, and it has just started to idle a little higher than normal. It idles like it should when cold, but once it heats up, after driving a few miles, the idle will go up 300-400 RPMs. I'm guessing at the RPM jump, don't have the tach installed yet. The motor is stock, and came from a '96 Tahoe 2wd.

Has anyone experienced this before?
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Old 06-16-2006, 03:56 PM   #2 (permalink)
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Quote:
Originally Posted by Charles
I put a 5.7L Vortec in my FJ40, and it has just started to idle a little higher than normal. It idles like it should when cold, but once it heats up, after driving a few miles, the idle will go up 300-400 RPMs. I'm guessing at the RPM jump, don't have the tach installed yet. The motor is stock, and came from a '96 Tahoe 2wd.

Has anyone experienced this before?

Might be a bas TPS or IAC valve, Check those
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