Question about 1990 GMC Sierra

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My 1990 GMC truck K1500 · Engine: 5.7L V8 TBI has no power or loose power going up hills and suggestions

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Sound like it could be a clog fuel filter, have you check it, if not remove and check to see if it's clog, replace it if bad, fuel filter is under your truck, on drives side, on inner frame rail.

Posted on Sep 15, 2010

  • dodgedigger Apr 20, 2011

    My truck runs bad just driving it on the road no matter if it is a hill or not . suggestions

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2 Answers

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Ranger looses power up hill


I am assuming you have the 2.3 liter 4cylinder engine.. This is common in all rangers straight out of the factory with that motor. Your asking alot out of a 4 cylinder truck that also get good gas mileage. they just do not have the capacity to gain speed up a hill. There are a few solutions for you that you could try. If it is a 5 speed manual transmission try to speed up before the hill and when you start losing speed go to 4th gear. this is also good for using as a passing gear as im sure you have noticed you lack power when trying to rapidly accelerate at highway speed to pass. an aftermarket cold air intake combined with a less restrictive exuast will give you anywhere from 5-20 hp gain AND give you more MPG's

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NOT ALLOWING FULL FLOW OF COOLANT THROUGHOUT ENGINE, TRY TO REPLACE THE THERMSTAT. WHAT ENGINE IS IT? 4.3L,5,7L ?

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No power up hills and pinging noises come from TBI little back fire.


Sounds like the knock sensor has failed. It's on the passenger side at the bottom of the engine block, in front of the starter. One wire going to it. Have you checked the timing lately, maybe it has moved?

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If you told a good dealer parts person what you where trying to do they could get the correct calibration processor for you, you are dealing with a bunch of by the book parts people, can't think outside the box.

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