1987 Chevrolet Camaro Different plug readings

Tiny
RADESI759
  • MEMBER
  • 1987 CHEVROLET CAMARO
I have a 87 chevy camaro 350 5.7 liter stroked out to a 383. The motor is carburated and the question I have is im trying to tune the motor to get it to run the best it can. When trying different jet sizes I run the car and check the plugs from cylinders 1 and 2. Cylinder 1 seems to be running good a little brownish tan on the plug. Cylinder 2 seems to be running very rich, smells like fuel and is very black. Just wondering what would make me have different plug reading throughout my motor?
Tuesday, September 3rd, 2013 AT 4:31 PM

4 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
It sounds like the fuel isn't all burning and causing that cylinder to run rich. The carb has no control as to how much fuel gets to each cylinder. Check both cylinders for spark. Are they both getting a hot, blue, snapping spark? Also, is compression the same in each?
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Tuesday, September 3rd, 2013 AT 6:38 PM
Tiny
RADESI759
  • MEMBER
  • 7 POSTS
I did a compression test before and had 130 to 150 psi in all cylinders. I will check the spark in cylinder 2 Tomarrow to make sure it is a nice got blue spark.
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Tuesday, September 3rd, 2013 AT 6:50 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Let me know what you find. Also, when checking compression, usually one doesn't want more than a 10% variance between cylinders. That can cause a slight misfire.
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Tuesday, September 3rd, 2013 AT 7:09 PM
Tiny
RADESI759
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  • 7 POSTS
Just checked the plugs while turning over the motor. Spark looks good to me. More orange than blue but looks like a pretty good ball when it fires.
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Thursday, September 5th, 2013 AT 4:19 PM

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