Question about 1999 Chevrolet Silverado 1500

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My 99 silverado has problem starting after being ran but will start fine if sits overnight

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Check the fuel pressure when hot, pump maby on the way out, when worn pump gets hot it will stick and stop working. when it fails again check to see if you can hear pump cycle when you turn key on.

Posted on Feb 02, 2010

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1992 Chevy Astro won't run, will start up great with starting fluid, or let it sit overnight.


You need to check the fuel pump pressure and I would change the fuel filter in the process. Sounds like you may have a bad fuel pump.

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Have you had the fuel pump checked out? Had this problem once. After replacing the fuel filter still didnt do anything. Replaced fuel pump fired up and ran fine. Was the fuel filter clogged with dirt?

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First thing is to check the fuel pressure regulator it could be faulty then i would check the fuel pressure it should be 60-66 psi with the key on and engine off.If its below 54 psi i would replace it.

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1 Answer

My 99 silverado starts great after it sits overnight, but after it runs awhile it will crank over for 5-10 seconds before starting. It also idles low and a bit rough. Otherwise it goes good on the highway,...


on the drivers side of the engine you will see the fuel rail. about center of the rail you will see the fuel pressure regulator. It will have a rubber vacuum hose going to it. Remove that hose from the regulator. if there is liquid fuel coming out of the regulator replace it.

There are a couple of other things that can cause this but the regulator is pretty common.

Let me know what you find or if you have any questions. Thank you for using fixya.com!

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1 Answer

I have a 1997 chevy cavalier that starts fine when its been sitting overnight, runs good while cold. after i shut the car off it won't start back up, it will fire up and then quit right away.


you stated after you ran the car for a while, then shut if off, and wouldn't restart, how long was the car running before it wouldn't restart, could be coil problem, doesn't sound like plugs or wires or car wouldn't run fine at 1st like you stated, you could also check the condition of the battery, it could have a week cell in it and while sitting overnight, it will recharge itself some , but not completely, have the battery tested , if it is the battery, and you replace it, and if it takes care of your problem, you have solved it, if not have alternator checked out.

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Test for weak spark when it wont run....my guess is that its the ignition module inside distributer...they heat up and shut off spark,then cool down and work again for a while...good luck..Lee

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take an ohm meter reading on your spark plug outputs between the three coils (if this has that type) big difference replace it and maybe the controller also.

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You will need to check every ground wire! Remove and clean each one. There are so many, too many to list! Frankster016

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You will need to have the battery tested, I am sure you need a new one, Kragen Auto provides free battery testing.

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