Question about 1998 Chevrolet S-10 Pickup

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My 98 Chevy S10 pickup is surging when im driving & at other times it runs fine. It will eventually get to where it will smother completely down.It will crank right back up but go dead again. i have replaced the o2 sensor,the fuse,the fuel pump,fuel filter,air filter,& still have the same problem. It has been hooked up to diagnostic twice & the parts that I mentioned were replaced by dealer.The last time i had it hooked up to diagnostics it didn't read anything wrong but i still have the problem. i have also replaced the catalyatic converter and as i said before my problems still occur.

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Hi

The surging may be from low coolant, when air in the coolant hits the temp sensor passage it changes the signal to the ECU and it searches for the correct idle.
Jack the front of the truck up to make the radiator neck the highest point and slowly top off the cooling system until full.
Check the sensor itself for damage and try to make a better repair at the connector,
Disconnect the battery for a few minutes to clear the computer and see what happens.

When the engine warms up something is expanding and causing a leak. Spray down the vacuum hoses along with any intake gaskets first with carburetor cleaner while the truck is idling and see if that causes the engine to rev up. If it does, you have a vacuum leak.
Otherwise, look into the Mass Airflow sensor. You might have an air fuel regulation problem at idle as you mention it behaves normally under acceleration when on the freeway.


Check this link too….

http://www.aa1car.com/library/car_wont_start.htm

Let us know if you have something more to know else accept the suggestion.
Thank You for contacting Fixya.com

Posted on Jul 30, 2010

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