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1998 Chevrolet S-10 misfire

Tiny
CRCHRISTER
  • MEMBER
  • 1998 CHEVROLET S-10
  • 4.3L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 310,000 MILES
Engine is running rough, Service Engine light is on with a Misfire code, read as random, and other times as Cylinder 6, Replaced Distributor Cap and Rotor, no luck.
Thursday, December 10th, 2015 AT 5:15 PM

7 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
Were there any other codes stored?
Have you taken a compression test?
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Thursday, December 10th, 2015 AT 5:56 PM
Tiny
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  • 4 POSTS
It had only one other code before which was for a O2 Sensor, which I replaced and that code went away, and no compression test
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Thursday, December 10th, 2015 AT 6:18 PM
Tiny
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You need to isolate which function is missing to cause the misfire, ie; spark, compression or fuel and that will give us direction.
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Thursday, December 10th, 2015 AT 6:26 PM
Tiny
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I replaced the Distributor Cap and Rotor, that should eliminate the spark, correct?
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Thursday, December 10th, 2015 AT 6:30 PM
Tiny
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No, it doesn't. Testing for spark during the failure is how you can rule out spark. It's not done by throwing parts at it.
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Thursday, December 10th, 2015 AT 6:33 PM
Tiny
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Ok, I'm going to go buy a compression tester, what should I use to test the spark?
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Thursday, December 10th, 2015 AT 6:37 PM
Tiny
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There are a number of different low cost spark testers to choose from.
You should be able to rent or borrow a compression gauge from one of the Auto parts stores Like Autozone or Advance.

I like this one because you can adjust the gap to test the strength of the spark.

https://www.2carpros.com/images/external/ignition_spark_tester.jpg
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Thursday, December 10th, 2015 AT 6:42 PM

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