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need help asap with my 99 gmc jimmy


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dreamer89
New User

Aug 9, 2011, 8:29 PM

Post #1 of 3 (2020 views)
need help asap with my 99 gmc jimmy Sign In

i have a 99 GMC jimmy 2wd 4.3l 6 cylider that i have a problem with, i turn the key and it starts just fine but after 30 minutes to 2 hours of driving i stop, park and and it wont want to start up again. but if i wait 10 to 30 minutes for it to cool down a little it will start up again. and lately if i stop while car is still running the motor has a light shake and tends to turn off and wont want to turn back on again. i have put in a new fuel pump, fuel filter, a tune up with new spark plugs and wires, new oil and filter new alternator and battery, also a new ignition coil and fuel pump relay.


nickwarner
Veteran / Moderator
nickwarner profile image

Aug 10, 2011, 5:56 AM

Post #2 of 3 (1996 views)
Re: need help asap with my 99 gmc jimmy Sign In

there should be codes stored in the ECM. Get them pulled and post them here.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 10, 2011, 7:19 AM

Post #3 of 3 (1992 views)
Re: need help asap with my 99 gmc jimmy Sign In

 
All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.



Every engine requires spark, fuel and compression to run. That's what we have to look for.

These are the basics that need to be tested and will give us the info required to isolate a cause.

1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.


2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.


3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.

4) If all of these things check good, then you would need to do a complete compression test.

Once you have determined which of these functions has dropped out,
you will know which system is having the problem.



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