Question about 2002 Chevrolet Silverado 1500

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Looking to buy my frinds 2002 Chevy Silverado. It has a 5.3 and getting P0300 codes. It is very hard to start, you have to cycle the key many times to get fuel for it to start. After may attemps, it will start and after a bit, idle fine. When you give it gas, it dies. If you feather with the throttle, it may rev up to 2000-2500 RPM's. It does not have enough power to drive it. Installed new fuel pump and filter. Has 55 to 60 fuel pressure. Replaced intake gaskets, plugs and wires. Plugged the computer in and cylinders 4&5 are the misfires. Swapped around coil packs, no change. Swapped injecters, no change. All cylinders have 120 psi compression. Replaced MAF sensor and IAC valve. Nothing. This all started when the truck got stuck in the mud. A little rocking back and forth and then it died. One thing the EGR tube where it goes in the plenum, was kinda burnt. Had to put a new grommet in it. Could that of caused any damage internally? I would really like some advice and thank you in advance.

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"All cylinders have 120 psi compression." I would be seriously concerned about this. Typically, an engine's compression should be much higher e.g. 180 psi or more. Could mud have gotten into the exhaust system causing restrictive back pressure?

Posted on Oct 24, 2013

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  • Tony Kruvelis
    Tony Kruvelis Oct 24, 2013

    I forgot to mention that I also diconnected the exhaust in front of the converters.

  • roadsterred Oct 24, 2013

    Disconnecting the exhaust pipes would not affect the compression. Did you have the throttle body wide open i.e. butterflies wide open when you did the compression test?

  • Tony Kruvelis
    Tony Kruvelis Oct 24, 2013

    I disconnect the exhaust to see if the converters may of been plugged. I only cranked the engine without pressing the throttle when I checked the compession. Now looking back, that should of been opened. I was looking more for a difference between cylinders for a head gasket maybe. The truck ran fine prior to getting stuck. It was only down a few inches on an incline. It was not "hot rodded" trying to get it out. We just pulled it with a strap. My first thought was the fuel/sedement in the tank from rocking may have plugged the fuel filter. By the way, thanks for the help!

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Posted on Jan 02, 2017

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Anonymous

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SOURCE: 95 GMC Jimmy 4.3l W vin rough idle

My problem was solved when I repaired my 4 wd activation dash switch. The switch was contacting on 2WD & 4HI at the same time. The front differential activation is vacuum activated possibly creating a tug of war that didn't actually engage it but drained off vacuum from the engine? A theory at best but stumbbled across it because I knew the switch wasn't working properly I repaired it and low and behold rough idle disappeared and all is good for 3 weeks running.

Posted on Dec 10, 2008

jamieallen29

  • 51 Answers

SOURCE: Chevy truck '02 surges between 45 and 55 mph

you should change the tps( throtal position sensor) this can cause that problem

Posted on Aug 15, 2009

Anonymous

  • 2 Answers

SOURCE: 2000 CHevy Silverado misfire code

try also the knock sensor..computer cant adjust timing

Posted on Sep 26, 2009

safefun4u

  • 67 Answers

SOURCE: 1992 Lumina Backfire - I

I know you mentioned the EGR valve has been replaced, but you may have a bad 'new' part. I know the car is electronic, but has anyone checked its ignition timing (timing belt been looked at, I know it only has 77k on it). Is the fuel pressure regulator OK and it vacumm supply?

Posted on Nov 15, 2010

SOURCE: 98 Chevrolet Silverado runs rough at half throttle and past.

try removing the EGR valve and clean inside of it and manifold

Posted on Feb 17, 2011

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