Question about 1999 GMC Sierra

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Hard to start but runs well when it does start

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Pretty sure these trucks use the oil pressure switch as a backup in case the fuel pump relay has issues. Swap the fuel pump relay with one of the others under the hood like the horn or ABS . It should say which one under the cover. If this doesnt help you may have a pump pressure issue that needs a gauge to test

Posted on Nov 19, 2009

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Hard start wont keep running


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Clean / replace air filter.

Top off ATF to MAX level.

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Need year/make/model/mileage of vehicle to provide a more specific set of troubleshooting steps.

When was the last tune up? Hard starts when cold are usually caused by fouled spark plugs, worn plug wires, or weak ignition coils. Fuel systems are not as effected by temperature changes as the ignition components.

Nov 28, 2012 | Cars & Trucks

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Wy do car run but sometimes hard 2 start?


Check out this both links shown below.Click the link and follow the troubleshooting to confirm,the problem.The car hard to start is basically the fuel pump issue:-----Car running hot? http://technoanswers.blogspot.in/2012/02/car-running-hot.html

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Car starting issues? http://technoanswers.blogspot.in/2012/02/car-starting-issues.html
-----This will help.Thanks.

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