Question about GMC Safari

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99 gmc safari, idles fine but as soon as give it gas it stalls, i have replaced Maf sensor, Map sensor, fuel pump and filter, cat. engine coolant temp sensor, tps, and intake air sensor, it will idle great but when you give it gas it chokes out, the fuel pressure is 60 when you give it gas it drops to about 55psi, oh and i also replaced the computer under the hood with a new one, i have alot of time and money in this and really can't figure out what to do next.

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Take it to a qualified repair shop .

Posted on Jun 13, 2017

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  • GMC Master
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Stop throwing parts at it and get it checked by a real mechanic. save you some money. if you have a meter you can check the tps sensor. its about the only thing you didnt do yet

Posted on Jun 13, 2017

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Posted on Jan 02, 2017

  • 58 Answers

SOURCE: IAT MAP MAF pics & locations

Go to alldatadiy.com and buy the car you are working on and you will have access for a year. This should have mechanical illistrations of what you are looking for. By the way that car does not have a MAP sensor.It uses a mass air flow sensor. Hope this helps...Dan

Posted on Jun 21, 2008

  • 148 Answers

SOURCE: engine stalls

your on the right route but also check egr valve

Posted on Jul 07, 2008

  • 58 Answers

SOURCE: no power when hit the gas

The fuel presure should be at least 60- 66 psi key on engine off, and then drop some when started, if it doesn't go any higher than 50 psi that would explain your backfire concern. If it is low then the fuel pump is weak. I have also seen soot on the little wires inside the Mass Airflow Sensor cause a concern like this.

Posted on Nov 18, 2008

66 chrgr
  • 1011 Answers

SOURCE: car wont start

check your fuel pressure it should be 35 psi .fuel pump relays dont go out but check all fuses with test light there is a fuel injector fuse but most likely problem is your fuel pump!

Posted on Mar 11, 2009

  • 14 Answers

SOURCE: 1992 gmc chevy 350 wont idle when warm

This could be a number of things but i think that your problem sounds like a vacuum leak or an EGR problem. Try listening for leaks and try un-plugging the EGR solenoid valve one time.

Posted on Apr 17, 2009

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1 Answer

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Sorry guys i was late with my feedback... So here it goes.. I have no check engine light.... Currently running the stock tune as well.. The car has no tps, pcv or egr valve.. It is all controlled by the electronic throttle body which i recently cleaned but didnt help with my problem. I ordered a new fuel pump as well, just didnt get the chance to install it yet. Cant change the fuel filter as it is builtin within the pump. However, shouldnt the fuel pump or fuel filter cause engine stalling, bucking and hesitation? I doubted the fuel pump could be causing this since the problem only occurs at idle. By the way, there is no missing on any of the cylinders.

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Hello,
When the MAF on most vehicles reach a point of preventing the engine from starting, you can usually just unplug it and the engine will start. If that doesn't work-
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Im not sure if you got it fixed yet! It could possibly be idle air control valve. But here some more suggestions! I had a 94 Safari van 4.3 liter I was working on for about three days and I finally figured out what was wrong with it. It would run fine for a couple minutes and as soon as I hit the gas and let off it would surge, but anyways I ended up changing the distributer, after the fuel pump and filter, mass air flow sensor, egr valve, idle air control valve, map sensor, and ignition module. So that might sove the problem if you were on the same track with it as I was. Hope this helps ya!

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