× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
1990 Pontiac Grand Prix LE 3.1L Poor Idle Quality
Posted to GM Driveability on 9/22/1999

It runs a little better,and I can get readings out of ecm on scanner, but idle is very bad. 15 - 20 inchs of vaccuum at MAP sensor. replaced sensor and ICS no better. I did notice the Check Engine light is not coming on at all!!! Checked for vaccuum leaks ...

  Related Documents & Media  1990 Pontiac Grand Prix LE

 
Message Closed w/FIX

car Vehicle Data

1990 Pontiac Grand Prix LE

VIN 1G2WJ14T1L
Engine3.1 L / 6 cyl / GAS
Trans3-speed Automatic
DeliveryFI / efi
SymptomsPoor Idle Quality
OccursAlways

Trouble Codes

33M.A.P. sensor vaccuum erratic
Message Closed w/FIX

car Vehicle Data

1990 Pontiac Grand Prix LE

VIN 1G2WJ14T1L
Engine3.1 L / 6 cyl / GAS
Trans3-speed Automatic
DeliveryFI / efi
SymptomsPoor Idle Quality
OccursAlways

Trouble Codes

33M.A.P. sensor vaccuum erratic