Question about 1999 GMC Safari

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What can be causing my 1999 GMC V6 Safari van miss and cutout when first taking off ,especially when it's cold. Have replaced plugs and wires , coil and pickup coil, crankcase sensor distributor cap and rotary bug. Replaced vacuum lines .once it warms up it stops missing and jerking as bad and just does it here and there. And other times it doesn't miss at all after driving about 15 miles or so . Got me stumped .know what I can try next ?

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Have your injectors cleaned or put a can of seafoam in the fuel tank

Posted on Dec 02, 2014

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1 Answer

1999 GMC Safari, rough running, knock detonation at wide open throttle


It seems like a problem with your ignition system. You could take a look under the hood at night / in the dark to see if there are any sparks between the spark plug wires and anything they touch or lay close to.
As the engine needs to be running during this test, please watch out not to touch any moving parts as it might lead to severe injury.

If you see any sparks - change the spark plug cables. If not, try to move the cables (with engine off) away from any metal parts they could be touching. Then start the engine and see if the problem persists. If it makes no change, you will have to start replacing the spark plugs, rotor + cap, wires and maybe the coil.

Dec 04, 2013 | GMC Safari Cars & Trucks

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...

Firstly...

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

Had the spark plugs and plug wires changed on my 1994 GMC Safari minivan, and now it runs very rough. If I stop, the engine shuts off. Backfires a lot also. The whole van shakes bad going down the road....


If your Safari did not expecience these systoms prior to you changing the plugs and ignition wires, then you may have crossed two or more of these wires when they were repalced.

Feb 20, 2011 | 1994 GMC Safari

1 Answer

Diagram for spark plug wires. The firing order.


1999 GMC Safari Van AWD 4.3 liter V-6 VIN "W"

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Hope helps (remember to rate this).

Oct 12, 2010 | 1999 GMC Safari

1 Answer

1999 safari van 4.3 6 cyl. has a service code PO


P0301 is a DTC code that indicates a misfire to cylinder one. It could be a bad spark plug, spark plug wire, rotor and cap, a dirty fuel injector, or the worst a bad head gasket. Cylinder 1 is the first cylinder on the drivers side, towards the front. Start with the simple and check the spark plug wire and add fuel injector cleaner to the gas tank. Good luck and hope this helps you get you van running 100% soon. If that did not help, then your going to have to do a tune up by replacing the spark plugs, wires and rotor and cap. You can get all the parts you need at Auto Zone and they can give you the step by step to get the job done with common tools in under 2 hours of your time. Keep me posted, be glad to know you got your van running 100% again soon.

Oct 27, 2009 | 1999 GMC Safari

1 Answer

2004 GMC Safari van


DO'ES THE VAN TURN OVER ? DO'ES THE VAN HAVE THE FUEL PUMP RUN LONG ENOUGH TO BUILD FUEL PRESSURE?IF YOUR FUEL PUMP AND STARTER ARE WORKING THEN CHECK FOR FIRE TO THE PLUGS. YOU MAY NEED TO GET THE CODES READ TO FIND THE PROBLEM IF YOU HAVE FUEL AND FIRE.ONCE YOU GET THE STORED CODES,REPLACE THE SENDER THAT CAUSED THE CODE OR REPAIR THE WIREING TO IT.

Oct 06, 2009 | 2004 GMC Safari

3 Answers

97 safari won't start when wet, after it rains the van will not start, fuel pump is new, seems like no spark, let dry for couple of days and it runs like normal


Had same exact problem, it was a bad coil. I could not duplicate "no start" problem with water bottle. Replaced coil and problem gone.
Note: There was a noticeable engine misfire at highway speeds on humid days. This accompanied the no start problem.

Jun 19, 2009 | 2000 GMC Safari

2 Answers

1999 gmc van wont start


need a new timing chain and gears

Jan 30, 2009 | 1999 GMC Safari

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