Question about 1999 GMC Yukon

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I have a 1999 gmc Yukon it is getting fuel and spark i even sprayed starter fluid in the intake but it still wont start it turns over good but wont start

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  • Michael Clayton Sr.
    Michael Clayton Sr. Dec 01, 2014

    did you take the air breather off and spray or did you spray directly into air breather? it makes a huge difference as i have the same problem what i have found is , it's the module behind the intake and yes it is very expensive looking for a cheaper price elsewhere



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Ok make sure you have good fuel pressure
you must have good spark must fire a spark tester
if all that is good then check compression
and don't use STARTER FLUID on a GAS ENGINE it can blow a hole through the piston
hope this helps

Posted on Nov 12, 2009

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I would check the fuel pressure and make sure it is within spec. On the vortec motors it might be hard to even make starting fluid work. there are not any open areas for the starting fluid to get inside the combustion chamber, because each cylinder has a fuel injetor stuffed into the only hole leading to each combustion chamber.
Good luck

Posted on Nov 12, 2009


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1 Answer

Timing is right on, good compression, got spark, good fuel pressure, wont start or even try

Try some engine starter fluid. Spray in the intake and see if the engine will at least try to start. If so, you have a fuel problem. If its fuel injected, something could be keeping the injectors from opening.

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I have a 1999 GMC Yukon getting fuel, spark and even cranking good at times. Then if I turn it off for a while, I have to squirt a shot of starting fluid into the intake hole and it cranks over & over...

If you have to spray fluid into it then it sounds like the fuel presseure is not there, get a fuel pressure gauge and see what the pressure reading is, then leave it hooked up for what ever time it takes to not start, before you try to start it check the pressure, if it has dropped then your fuel injector/s or fuel regulator is leaking, crank the engine after taking the reading, the fuel pressure should come back, 60-66 PSI, Vent the fuel tank vapors by loosening the fuel cap.Position the ignition switch and the A/C system in the off position. Install a fuel pressure gauge to the vehicles fuel pressure valve. and with the keyon, engine off verify the PSI reading on the gauge.
Anything less than 60 psi and your fuel pump is weak

Jul 28, 2011 | 1999 GMC Yukon

1 Answer

Can't start

Determine if it's more of a spark problem or more of a fuel problem.

If it turns over vigorously, then the battery and starter is good.

If it won't start even though it is turning over, then I would spray some starting fluid into the intake and see if it starts momentarily or for a few seconds.

If it does start, then you know you have spark, but no fuel delivery. In which case it could be a bad fuel pump or fuel injectors aren't firing.

If it doesn't start even with the starting fluid, then you may not have spark.

Good luck on this diagnosis.

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Engine turns over strong but wont start.....sprayed starter fluid inside air intake and it started,,,so i know spark is good...runs great when it is running just wont fuel supply obviously but...

one answer is lack of compression in the cylinders,normally associated with high miles.
could also be valve seats/spark plug gap/dirty air filter,there are a few more but start with the cheapest to diagnose and work up.....

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Nov 30, 2009 | 1999 GMC Yukon

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A 1999 GMC Yukon has a fuel-injected engine. They are known for the fuel injector lines inside the intake plenum to break and flood the engine. If you are pouring starter fluid and gas in the intake you are only making it worse. replace the injector assembly with the "new improved" injector assembly and replace the plugs, then it will probably start.

This subject is covered by GM Technical Service Bulletin No.: 00-06-04-003B

See GM Parts List below. This replacement Injector assembly is now also available in the aftermarket.

Nov 11, 2009 | 1999 GMC Yukon

1 Answer

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Sounds like a fuel pump. You can have your SUV hooked up to a fuel system pressure gauge and see if you are getting 36psi or higher. Anything under that and you have a bad pump.

Aug 01, 2009 | 1999 GMC Yukon

1 Answer

My 1999 GMC Sierra wont start. It has the 5.3l V8

Sounds like a security problem that is preventing starting. It will run for a few seconds and then die.

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