Cavalier idles fast
#1
10-27-07, 08:51 AM
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Cavalier idles fast
Hi, Guys. My friend has a 2001 Cavalier, 2.4l dohc with a 5 speed trans. Hot idle is 1500 turns. I checked for vacuum leaks & found none. Scanned for codes, none. I unplugged the idle control valve & it doesen't change. I'm not famillar with Chevs system, (more a Detroit diesel man
) Does anyone have any tips or more experience on these for suggestions?? Thanks, Roger
) Does anyone have any tips or more experience on these for suggestions?? Thanks, Roger
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10-27-07, 10:06 PM
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If you have a scanner that is capable of live data you can look at the fuel trims to tell if there is a vaccuum leak....sometimes they can hide. Gasket failure on the underneath side of the intake manifold can be particularly tricky to diagnose.
If the fuel trims are high in indicates a lean condition....test drive the car with someone else monitoring fuel trims. Accelerate to 3 or 4 thousand rpm for a few seconds and if the fuel trims drop considerably than you have a vaccuum leak.
Not to completely rule out a new PCM or reflash, but if I were you I would try this and some other basic stuff first.
If the fuel trims are high in indicates a lean condition....test drive the car with someone else monitoring fuel trims. Accelerate to 3 or 4 thousand rpm for a few seconds and if the fuel trims drop considerably than you have a vaccuum leak.
Not to completely rule out a new PCM or reflash, but if I were you I would try this and some other basic stuff first.
