98 tahoe not firing on all 8

Repeatman · May 27, 2020

This morning i started up my truck. Ran fine for about 10 seconds then started iding rough ive replaced all igniton wires and plugs only to have the problem remain. The most bizzare thing is, its not firing on 3 of the passenger side cylinders. I pulled the ignition wire off the ignitor coil and distributor and cranked it over. The ignitor coil sounds like its not getting the signal to fire on all 8.

exp500 · May 27, 2020

Looks like you found it! Ignition Module or Distributor cap. Probably cap if spark strong. Be sure to check codes and fuel pressure. But since you are guessing, so am I. Cap- Delco or United dcr- 820X. Module - Delco or Delphi.

OR VietVet · May 27, 2020

Be sure to check the pickup coil wiring, inside the distributor, to make sure the insulation is not rubbed off and that the wires are still attached at the center area. If broken, seen a lot of them, the engine typically does not start at all but the wire could be just making contact, barely. I would definitely check that cap for arcing and cracks. Replace rotor if you do the cap. May need to run a compression check but not yet.

Repeatman · May 29, 2020

Found the problem. Pick up coil on distributor. Replaced dist. Cap and rotor runs great now!

wjburken · May 29, 2020

Repeatman said:
Found the problem. Pick up coil on distributor. Replaced dist. Cap and rotor runs great now!

Glad to hear you got it taken care of. Thanks for coming back and sharing what your solution was.

exp500 · May 30, 2020

Could you edit your first post heading? Add SOLVED or FIXED

OR VietVet · May 30, 2020

Repeatman said:
Found the problem. Pick up coil on distributor. Replaced dist. Cap and rotor runs great now!

Told ya! Na na na na na............. :chewie:

98 tahoe not firing on all 8

Repeatman

TYF Newbie

exp500

Full Access Member

OR VietVet

Multnomah Falls

Repeatman

TYF Newbie

wjburken

exp500

Full Access Member

OR VietVet

Multnomah Falls

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