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1993 Chevy Truck Will turn over and crank but dies under lo

Tiny
GIRLYMECHANIC
  • MEMBER
  • 1993 CHEVROLET TRUCK
  • V8
  • 4WD
  • AUTOMATIC
  • 217,000 MILES
There is no trouble codes. The truck will start while cool, run fine, then when put under load it will shut off with no warning or any sputters. The vehicle then will not re-crank until cool. I replaced the ignition coil and it still does it. It is getting fuel, I checked the injectors. I however do not believe it is getting spark. I have read that it could be the main relay. I'm not sure and need help ASAP. Thanks
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Tuesday, April 13th, 2010 AT 6:51 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Do below:

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine atleast 3/16 away from ground-have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it
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Tuesday, April 13th, 2010 AT 7:07 PM
Tiny
GIRLYMECHANIC
  • MEMBER
  • 1 POST
ICM was faulty. Replaced the ICM along with plugs, cap, and rotor. Truck runs really well now. Am updating in case someone has a similar problem. Good luck all
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Thursday, April 15th, 2010 AT 9:57 AM

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