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1989 Chevrolet R2500 Suburban Scottsdale 7.4L High Idle
Posted to GM Driveability on 3/10/2004 22 Replies

Engine rpm is 750 to 775 in gear, iac showes 80, when you put it back in park rpm goes to 1500 and stays there, iac still showes 80. If you kill engine and restart it idle is about 800 to 850 and iac showes 10 to 15. tps checks good, p/n switch shows good, all...

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Message Closed w/Summary

car Vehicle Data

1989 Chevrolet R2500 Suburban Scottsdale

VIN 1GNGR26N0K
Engine7.4 L / 8 cyl / GAS
Trans4-speed Automatic
DeliveryFI / TBI
Emissionsca emissions
SymptomsHigh Idle
OccursAlways, Idle
Message Closed w/Summary

car Vehicle Data

1989 Chevrolet R2500 Suburban Scottsdale

VIN 1GNGR26N0K
Engine7.4 L / 8 cyl / GAS
Trans4-speed Automatic
DeliveryFI / TBI
Emissionsca emissions
SymptomsHigh Idle
OccursAlways, Idle