1994 Chevy Silverado Engine - Spark loss at plugs and coil

Tiny
GREATHO
  • MEMBER
  • 1994 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 111,400 MILES
I can see blue spark loss at the plugs and at the coil of my 5.7 engine runs poorly and misses. First attempt to solve this problem - I replaced coil, distributor, rotor, distrib. Cap, spark plugs, and wires with Genuine AC parts from the dealer. Problem went away for 1 day and then problem returned. I can again see blue sparks when viewed in the dark under the hood at each plug and at the coil - runs poorly and misses.
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Thursday, December 4th, 2008 AT 7:25 PM

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Tiny
MASTERTECHTIM
  • MEMBER
Wow I have never seen that with gm parts. Are you usuing the correct heat range spark plug? R43? I have exact same truck. All parts you replaced are what commonly cause a ignition breakdown. Spark jumping from wires at the spark plugs is caused by one thing and thats high resistance in the spark plugs, thatss why you should double check the spark plug gap and size.
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Thursday, December 4th, 2008 AT 8:32 PM

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