Cylinder number four misfire

Tiny
JUSTIN LEE POLK
  • MEMBER
  • 1996 GMC JIMMY
  • 4.3L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 201,000 MILES
Gave it a cap, rotor, distributor, wires, plugs, ignition coil, and ignition module. Had it re-timed and still an issue with number four cylinder. Starting to get bummed out about it. It is a great truck. I am just hoping the spider is not going out for that cylinder and or compression.
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Monday, December 19th, 2016 AT 11:42 AM

2 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
These are very hard to find what the problem is it can be a sensor or anything from low fuel pressure to basic engine problems. Best thing here and cheapest option is to let a mechanic find the problem and fix before you dump any more money on good parts that do not need replacing.
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Monday, December 19th, 2016 AT 12:06 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,017 POSTS
Run a compression and leak down test. Easy to do and would at least give you an idea.
If it is a spider issue, do not bother replacing it with the original poppet style, you can get an upgraded unit that uses real injectors for about the same money and it is a big improvement.
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Monday, December 19th, 2016 AT 12:40 PM

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