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International Automotive Technicians Network
1991 Chevrolet S10 4.3L Poor Idle Quality
Posted to GM Driveability on 12/30/2002 25 Replies

We are stumped here and in need of some help. Customer brought in an S-10 pickup that runs at high idle now at all times ([...] rpm). He stated that he pressure washed the engine 4 days ago and it's been that way ever since. scan tool shows two codes: 21, 24. ...

25 Replies Received (View Replies)

  Related Documents & Media  1991 Chevrolet S10

 
Message Closed w/FIX

car Vehicle Data

1991 Chevrolet S10

VIN 1G1CS14Z2M
Engine4.3 L / 6 cyl / GAS
Trans4-speed Automatic
DeliveryFI / TBI
SymptomsPoor Idle Quality
OccursAlways

Trouble Codes

21throttle position sensor
24vehicle speed sensor
Message Closed w/FIX

car Vehicle Data

1991 Chevrolet S10

VIN 1G1CS14Z2M
Engine4.3 L / 6 cyl / GAS
Trans4-speed Automatic
DeliveryFI / TBI
SymptomsPoor Idle Quality
OccursAlways

Trouble Codes

21throttle position sensor
24vehicle speed sensor