Question about 1999 GMC Yukon

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My 1999 yukon wont start i changed master air flow

I have a 1999 yukon i tried alot of things i changed the master air flow sensore , Then I changed the battery and i did a full tune -up and it still wont start.

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  • Dave  C
    Dave C May 11, 2010

    Have you checked fuel pressure yet, you probably need a new pump?

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My 99 is similar, after sitting for 36hrs or more (getting home Sat. afternoon till Mon. Morning), When I go to start it, it cranks like it is flooded. if you plug off almost all air to intake, making some suction on your hand while cranking, it fires up and runs like normal. after replacing the intake tube (filter to intake) accelerates and drives fine. The next day (Tuesday thru Saturday Morn), starts right up. I park it Sat. afternoon, come Monday Morn, same prob. Thre Sundays ago, I Started it (no Prob) rev'd it a couple times, running for half a minute and shut it down. Monday, I had to Plug the intake again. two weeks ago, I went a block away from my Apt on Sunday for Breakfast, ran it a couple minutes before shutting down, Drove it back home a couple hrs latter. Monday, had to Plug it. Last weekend, I went to same restaurant, then drove around like a teenager for a couple minutes in low gear. This morning, Started right up. Any suggestions other than take up going to church on Sundays?

Posted on Dec 05, 2011

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Fuel pumps are real common to go out on those vehicles

Posted on Mar 15, 2010

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1 Answer

What do u use to clean a master flow on a 1999 yukon is there a spray


If you are cleaning an air flow meter use a approved MAF cleaner which is available at auto parts stores.

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Good question. There are certain things an engine needs to start and run.
> air-fuel mixture
> volumetric efficiency
> compression
> ignition

Which of these things is your engine missing?

Nobody can tell you over the internet without first checking the vehicle out to determine which of these things are missing. Even if we knew which one, there are MANY things that can be the possible cause of each of these things to not be correct.

Plain and simple, the vehicle is going to have to get checked out.

Anybody who tries to tell you any different does not know anything about automotive diagnosis and repair.

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Try cleaning the mass air flow sensor. It's a sensor that is in the air tube from the filter to the throttle body. If it gets dirty it will send a no start signal to the computer.

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Mya 04 gmc yukon wont start again , just got fixed the mech said it was an ecm fuse? but got it back an wasnt accelerating rite an now it wont start again??


U should have ur computer scanned to ascertain actual fault, is anything showing on the warning lights, there might be a faulty sensor (air-flow), also make sure fuel pump, n injectors are clean of any dirt. The air filter element must be clean as wel. Go ahead n check these out. Good luck.

Jun 12, 2011 | 2004 GMC Yukon

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No acelleration,as long as i push on the peddel lightley it will go if i push down to much starts hesatating so i let up its fine also no check engine light on its a 1999 yukon


If the car has a mass air flow sensor try disconnecting it and the try revving up, if ok then replace mafs

Regards

Lloyd

Apr 30, 2010 | 1999 GMC Yukon

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Sounds like a fuel problem, when was the last time the fuel filter was chg.? If that is not an issue, than a fuel pressure test is in order, It should have around 48 to 50 p.s.i.

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Very difficult to start in the mornings


Hello.

In the first instance. Unhook the air flow sensor and see if this make a difference. If it does your Mass Air flow sensor needs cleaning or replacing.

Try changing your airfilter and Spark plugs. I would also use some heavy duty injuctor cleaner in the fuel.

Dec 01, 2008 | 1999 BMW 323 Series

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