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Truck is a 1997 GMC half ton with 5.7 engine. When first ...

Sent to Car Experts September 15, 2006 12:42 p.m.

Truck is a 1997 GMC half ton with 5.7 engine. When first started, either hot or cold, the engine hesitates, stumbles. After about one minute, it clears out and runs great until started again. I have changed the starter positioner sensor and the sensor located in front of the thermostat housing. The fuel enjectors cleaned about two weeks ago and the fuel pump was changed about two year ago. Have new fuel filter installed. No check engine light. Help

Optional Information:
1997 1500 5.7

Already Tried:
Changed throtle positioner sensor, sensor in front of thermostat housing, cleaned fuel enjectors, new fuel filter.

Customer (name blocked for privacy)

Status: Closed Value: $8

Answer
September 15, 2006 3:46 p.m. (3 hours and 4 minutes later)

ACCEPTED

Have you tried replacing the ect sensor on the motor? Sometimes with the gm trucks it can cause a issue where the trucks sensor is old or cracked and it miss-reads the temp of the coolant and sets the car fuel mix incorrectly. Do you have access to a tech-2?

S-seriessaturns -- Auto Mechanic -- No feedback on 2 Car accepts
5 years on hand with Saturn of Austin

Reply to S-seriessaturns
Sent September 15, 2006 7:15 p.m. (3 hours and 29 minutes later)

Can you tell me where this sensor is located? I do have a shop manual that will help. Thanks

Customer (name blocked for privacy)

Reply
Sent September 18, 2006 6:16 p.m. (2 days and 23 hours later)

Relist: I still need help.
I replaced the ect sensor and the problem still exist.

Customer (name blocked for privacy)

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