Question about 2000 GMC Jimmy

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No compreesion on 2000 gmc 4.3l

Replaced Head gaskets, push rods, timing chain and gears, cam and crank sensors, cap, rotor, and still turns over like a sewing machine. TDC is good but will not start?

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  • Ron Riggs
    Ron Riggs Dec 01, 2012

    The timing marks on the crank pully are lined up correctly and the distributer is pointing at the number #6 on the cap just like the book says and still no compression?

  • Ron Riggs
    Ron Riggs Dec 01, 2012

    Would not having the correct fuel pressure cause it to have this issue?

  • Ron Riggs
    Ron Riggs Dec 03, 2012

    Getting fuel to plugs but no compression, figured after blowing head gasket cleaning out motor with kerosene destroyed the carbon and slug build up on the rings therfore no compression now i have it all back together. Did a test on all cylinders and got nothing for comression.

  • Brad Brown Dec 03, 2012

    Get a cylinder leakdown test kit. It checks the seals on every part of the cylinder. By listening you can tell where the air is going. But with nothing being present I am still thinking valves are out of time

  • Brad Brown Dec 03, 2012

    http://www.harborfreight.com/cylinder-le...

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  • GMC Master
  • 15,478 Answers

You need to check the mechanical timing of the cam and the crank. it appears that they are not correct. The valves are open when the pistons are compressing.

Posted on Dec 01, 2012

  • Brad Brown Dec 01, 2012

    When you say that it cranks like a sewing machine I thought that it meant it was smooth. Therefore not getting compression. After you try and start it, pull a plug and see if it smells like gas

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emissionwiz
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SOURCE: Misfires 96 gmc sierra 5.0

I suggest you have the injectors tested by the dealer, the sludge buildup will not cause a miss fire. to clean the throttle body use carberator spray while holding the engine idle high.

Posted on Aug 05, 2009

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SOURCE: 2006 gmc sierra 1500 stalled and will not start.

i have a 06 sierra that done the same thing and it was the distributer gear stripped

Posted on Dec 08, 2009

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SOURCE: Timing appears to have jumped 180 deg. How do you

Check to make sure that the timing mark is there when #1 is TDC.Leave the wire on #1 cylinder and place the plug on somethig metal .With all the other plugs removed bump it over until #1 sparks. I would think that maybe the roll pin that holds the gear to the bottom of distibuter may have shered .This would cause issue.The cam and crank sensor will not make your timming off 180Deg.Timming chain will.But 180Deg I would think not.Where is the #1 cylinder when it is lined up in the cap? Make sure that you can't turn your distributer.Don't think you can turn it that far without removing it.

Posted on Jan 01, 2010

csmock132
  • 4669 Answers

SOURCE: truck burns alot of fuel, hesitates all the time

If you have that code the distributor isn't set right. I don't suppose you have access to a scanner? That is the only way to get it set right.

Posted on Jul 10, 2010

  • 1 Answer

SOURCE: i have a 85 gmc s-15 v6 2.8 pickup. ive replaced

It sounds like to me the engine is out of time. Check your firing order to make sure that is right all so check all your wiring going to your distributor. I dont if you bought these parts new or used if used check you coil and ditributor. I hope this might help you. they have a book s-10@s-15 which they sell at any auto store or the library.

Posted on Nov 20, 2010

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1 Answer

Replaced head gasket torqed everything to right spec started up and ran fine for 3 to 5 minutes made noise and died now cranks over fine no start


as the engine started and ran, indicates that the timing and chain sections were assembled right
the noise and stop never to start again may be attributed to cam or crank position senor problems
they both have a set clearance from the rotors to work properly so if one was not tension properly and touched a rotor it would make a noise and stop functioning
next is the lubrication of the cam shaft bearings
If the head gaskets were not installed the correct way up the oil passage may be blocked making the bearings run dry and seize up or spin in the bearing caps . Im a bit cautious on this as 3-5 minutes means for it to happen bearing caps would have to be misaligned , placing extra pressure on the shaft but it can happen quickly especially if the oil passage was blocked by the head gasket
in the event that that happened ti could have caused the timing chain to fail or jump timing
unfortunately I can only surmise and go on your insistence that it was done right but the sad fact is , something was done wrong , or it would still be going

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bent push rods could have been caused when the chain broke and not from the chain been replaced wrong or the timing out.

if the engine was running when the chain broke the cam would have stopped leaving all the valves in the same positon as the mometum of the fly wheel continued to turn the pistons in the cylendars could hav come up and hitting the valves and bending the push rods. and or damaging the cylendar head.

recommend removing the head and have it checked for damage, as well as replacing the bent push rods, and cylendar gaskit. once the head is checked and the valves are seated well. then replace and follow instructions in the set up for the pistons and cam prior to replacing the chain and setting the timing.

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Check to make sure that the timing mark is there when #1 is TDC.Leave the wire on #1 cylinder and place the plug on somethig metal .With all the other plugs removed bump it over until #1 sparks. I would think that maybe the roll pin that holds the gear to the bottom of distibuter may have shered .This would cause issue.The cam and crank sensor will not make your timming off 180Deg.Timming chain will.But 180Deg I would think not.Where is the #1 cylinder when it is lined up in the cap? Make sure that you can't turn your distributer.Don't think you can turn it that far without removing it.

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