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I have a 98 gmc sierra z71 that will start up idle for a few seconds then die. We have checked everything we think possible. All the filters, sensors, the fuel pressure, not sure what else to do or what to try.

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  • Cars & Trucks Master
  • 975 Answers

Pull the dist. cap and make sure the rotor has no side to side
play.
The top bushing wears out and the magnet hits the pickup.
Maybe ,my best thought.

Posted on Jan 06, 2013

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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emissionwiz
  • 76682 Answers

SOURCE: 98 GMC k2500 7.4L Rouch Idle

TRY THIS BEFORE U SPEND ANYMORE MONEY N PARTS.
Here is the common cause of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake

Posted on May 22, 2009

hotrodtod38
  • 141 Answers

SOURCE: Car starts, runs a few seconds then stops.

did you spray the maf sensor or intake hole ?if you didnt spray maf then probly not! have some one turn the key why you listen in the fill gas hole for pump noise ? sould here somthing for 2 seconds at least besure you ear is there before key is turned , also check you ecu fuse to see if it may be blown .? also you could try unhooking battery cable for 20 minutes neg side only then rehook it and try to start it! good luck

Posted on Feb 17, 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

dennymulford
  • 1055 Answers

SOURCE: 1998 GMC Sierra- runs rough then stalls when

had this problem on my neighbors 98 chevy truck with the same engine !!
it turnd out too be the fuel pressure regulator,you have too pull the upper intake too replace it!!

Posted on Jun 06, 2009

Molson02536
  • 3854 Answers

SOURCE: 1995 GMC Sierra z71 oil pressure dropped- need advice on this

The oil pump is in the oil pan and needs to be dropped and being a 4WD you also need to drop the front axle pumpkin to remove the oil pan and replace all the gasket needed. Start with the easy and replace the oil pressure sending unit, it's on the back of the engine to the passenger side of the distributor. You can go to Auto Zone and pick up a new Oil sending unit, just make sure your get the right one, "Sending Unit" Looks the same are the oil pressure sensor but the unit reads the pressure, the other just signal a light to go on and off. It's an easy fix like replacing a spark plug. 

Posted on Jun 29, 2009

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if it starts for a few moments chances are that all systems are ok for the basics, fuel, spark, compression. What is most likley the cause is either a security system problem, or a problem with a mass air flow or other sensor, your thinking is semi accurate but remember to KISS keep it simple sunny.

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