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Hitting only on four cylinders

Tiny
JEFF RANOWEL
  • MEMBER
  • 1990 CHEVROLET CHEVETTE
  • 3.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 154,000 MILES
Started tuning on maybe four or five cylinders pulled and replaced spark plugs, they were coated with unburned gas and carbon. Still starts, but running really rough could it be distributor cap something like that?
Wednesday, November 23rd, 2016 AT 10:23 AM

5 Replies

Tiny
JIS001
  • MECHANIC
  • 3,408 POSTS
If they are wet with gas then do a compression check first.
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Wednesday, November 23rd, 2016 AT 11:34 AM
Tiny
JEFF RANOWEL
  • MEMBER
  • 3 POSTS
Compression good I am thinking computer?
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Wednesday, November 23rd, 2016 AT 1:43 PM
Tiny
JIS001
  • MECHANIC
  • 3,408 POSTS
Have you tried swapping the fuel injectors to a different cylinder to see if it does the same thing on a different cylinder?
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Wednesday, November 23rd, 2016 AT 3:15 PM
Tiny
JEFF RANOWEL
  • MEMBER
  • 3 POSTS
I have some bad injectors I believe. Thank you.
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Wednesday, November 23rd, 2016 AT 3:48 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,034 POSTS
Please let us know happens so it will help others. I want to say Corvette not Chevette?

Best, Ken
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Saturday, November 26th, 2016 AT 8:21 PM

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