1998 Chevy Astro High Idle

1998 CHEVROLET ASTRO
152,500 MILES • 6 CYL • 2WD • AUTOMATIC
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BILLYTHEGC
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  • 1 POST
I have a 1998 Chevy Astro V6 Vortec 4.3. It has a very high idle at approx 2200-2500 RPM all the time. I replaced the Mass Air flow sensor, the Idle control valve and the throttle position sensor. I have sprayed the engine with carb cleaner to check for air leaks with no luck. As for codes... The first one I got was about the Mass air flow voltage, so I replaced it. The second code was about the throttle control had low voltage so I replaced it. I replaced the Idle control valve because the old one was fried. Please help. Call me at 760.880.2552
Jun 19, 2008 at 4:11 AM
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MMPRINCE4000
  • ✓ASE Certified Mechanic
  • 8,548 POSTS
  • ASE Certified Mechanic
An idle that high would indicate a vaccum leak somewhere.
Check all the vaccum lines and don't rule out an intake manifold gasket or an injector seal leak.
Jun 19, 2008 at 7:38 AM
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