Question about 1996 GMC Jimmy

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1996 gmc jimmy wont start seems like advanced timing issue backfiring out throttlebody, replaced timing pick up, distribitor cap, crank sensor, ICM, when ignition conrol module replace the engine ran fine for about 4 seconds and went to backfiring out throttlebody, then replaced injectors inside intake manifold, still backfiring. it has 65 psi fuel pressure. this whole problem started after wife drove car it quit and had to tow home. distribitor is tight. i have not checked with a timing light. it is late and didnt think to check with timing light until right now. any ideas ?

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  • toneman2121
    toneman2121 Jun 05, 2010

    when i had a problem with my dad's crown vic, which was similar to the problem you describe, i disconnected the mass air flow sensor. the car ran better because the computer was using default data. it didn't run great but much better. i changed it and everything's good again. it didn't set a check engine light, so it was a little difficult to find. not sure if your system has a maf sensor. is their a check engine light on?



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You said the problem happened right after the engine was replaced correct? If so bring number cylinder to top dead center on the compression stroke. Remove the distributor cap and see if the rotor is lined up with the number one spark plug wire. It's possible the distributor was installed 180 degrees out.

Posted on Jun 05, 2010


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1 Answer

How to fix distribitor timing problems

Remove number, one spark plug , turn engine over till compression is felt, turn engine over till TDC marks on crank pulley and timing cover marks line up, fit distributor to motor with rotor pointing to number one distributor cap tower, start and set final timing with timing light.

Sep 21, 2015 | 1999 GMC Jimmy

1 Answer

GMC safari won't start, new coil, ICM, plugs (delco) Wires, cap, rotor, get's gas, new starter.

This just happened to my Dad's 1998 GMC Safari...


Check the hard vacuum line as previously noted by others.
If that's ok, then take off the intake pipe and spray brake clean into the throttle body while trying to crank it.

If it starts.. then you have a fuel related issue, if it doesn't start then you have an electrical related issue.

Our van did not start after trying to use brake clean.

Take off the console inside the vehicle's cab and get at the distributor.

Usually people noted that the ICM (ignition control module, inside the distributor) was the main issue here, but on our van, the distributor and wires looked brand new so it was probably recently changed (we got this van 5 months ago), so I assumed the spark plugs were also changed at the same time.

We unplugged the connection from the coil to the distributor, tried to crank it, and no spark was being generated, boom, got a new coil and starts up fine.

Just takes a bit of trial and error.

Dec 16, 2012 | 1996 GMC Safari

1 Answer

I have a 98 chevy 5.7 cortec 350, the truck starts and runs but sometimes it backfires and misses... ive changed the cap and rotor, the crank shaft and cam shaft sensor are good i do have a p1345 code......

check the firing order of the HT leads as it is easy to cross 2 leads
the timing is set at 12 degrees btdc and no where else so use a timing light and set it there

May 20, 2017 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

Cranks fine but wont start. i can smell fuel. seems like its not firing.

I would check for a spark first, but you can pull of the distributor cap and check if the rotor is still turning. If it is not turning, you may have a broken timing chain. If it is turning and there is no spark, it is probably bad spark plug wires, spark plugs, distributor cap, rotor, camshaft position sensor, or crankshaft position sensor.

May 24, 2011 | 2000 GMC Jimmy

2 Answers

Replaced fuel pump fuel filter fuel relay and still will not start somtimes will start but only runs for about five minutes shuts off and will not start again

check the igniton module in the distributor also check the rotor bug and cap and one other thing check the gray! impluse feed wire from the fuel pump relay all the way down through the frame back to the fuel pump inche by inch! in 1997 GMC and Chev had issues with faulty wiring in the fuel pump feed harness and i found over 700 trucks would lose voltage in the GRAY wire somewhere in the frame and usually in a section under the cab and front of the bed area the wire wont be broke visably! it breaks internally making it hard to locate visually you will need a test light or a volt meter to trace it down

Jan 24, 2010 | 1997 GMC Jimmy

1 Answer

1993 jimmy wont start

you are off the timing by a tooth or two. when you replaced the cap and rotor, if you did not mark the position of the rotor with some point on the motor or firewall, then it is likely that you installed the rotor by a couple of degrees. so, when you are going up hill, and the engine needs to advance the timing to add power you timing is off even more causing lack of power and sputtering and backfiring.

Apr 22, 2009 | 1993 GMC Jimmy

1 Answer

Wont start

fuel pump maybe

Mar 13, 2009 | 1993 GMC Sierra K1500

1 Answer

1994 GMC Jimmy hard to start and runs rough when first started

did you do a fuel pressure test? if you havent do it its cheep an at least you can elimanate that. if thats not an issue, then there is only two other things crank sensor, and if there is one cam sensor.

Feb 02, 2009 | 1994 GMC Jimmy

1 Answer

No start

When you change out the Distributor, you need to change out two other things as well. You need new spark plugs, and spark plug covors.

Jul 12, 2008 | 1993 Mazda MX-3

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