Question about 1986 GMC S-15

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My 1989 gmc S15 keeps stalling at certain points when driving it. at times it will start back up but when i step on the gas its stalls out again. any ideas as to what can be causing tis? At other times it runs great, this is so frustrating to have it work one day and stall the next. Please help.

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Posted on Jan 02, 2017

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SOURCE: GMC 2500 Sierra keeps stalling

If you get check engine light or a service engine soon light then is something related to the computer.
Can cause stalling, Bad fuel, clogged fuel filter, bad spark plugs, bad spark plug wires, bad O2 sensor (would cause a check engine light) bad ignition coil, bad cam shaft sensor, bad crank shaft sensor.

Posted on Aug 01, 2008

  • 1 Answer

SOURCE: 1997 GMC Savana stalling

HI. Had the same problem and searched for months. its pump injectors. You re looking for 1500$ part and 400$ labor.

Posted on Mar 30, 2009

  • 14 Answers

SOURCE: 92 gmc rally stall while running

Ignition module and ECM are the the most likely canidates to your problem.

Posted on Apr 17, 2009

  • 58 Answers

SOURCE: stalls or pulls when you press on gas

Let's think about this as a normal problem first:
It takes three things to have combustion:
1) Oxygen (in the form of air in this case)
2) Fuel (in the form of gas in this case)
3) An ignition point (in the form of a spark plug in this case)

The trick is getting these three variables in the right ratios, at the rigth times. Any of them is off (too much fuel, not enough air, spark too early or too late) and you have a failed combustion.

A car's internal combustion engine is no different. Reading your request, I think we can pressume that the engine actually starts and runs idle.

If this is the case, then check the following:
1) Change the air filter.
2) Has the fuel been sitting in the car? If so, you may want to drop in some injector cleaner into your tank.
3) If the above two fail, take the car to a mechanic and have them check the injector pressure. The problem may be related to the fuel pump not putting up enough pressure to rev the car, while only putting up enough pressure to idle the car.

Hope that helps!

Posted on May 20, 2009

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SOURCE: why does my 1998 gmc truck backfire and stutter sometimes stall when driving

my friend the car backfires if its runing lean ( insufficient fuel ) or runing rich ( insufficient oxygen ) this mostly in carbourated cars would make incomplete compustion . in engine with fuel injuction there may be a leak in the intake valve that makes the fuel to burn in the exhaust pipe . so check for leak asap

Posted on May 29, 2009

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