1993 Chevy Blazer Engine skipping

SIGFRIED

MEMBER
1993 CHEVROLET BLAZER
6 CYL
4WD
AUTOMATIC
144,409 MILES

I have a problem with my engine skipping a cylinder. When I switch it on it starts with a little lag and runs with what sounds like one cylinder skipping.

I changed 4 out of the 6 spark plugs (minus the rear right two looking from the front of the car which are blocked by the steering wheel shaft) to see if that would fix the problem. Still skips.

Next I take out the spark plug wires to see if they are the culprit. I checked for wear and tear and see nothing wrong with them.

Next leading problem would be the distributor but I don't want to tear that out just yet if I do not have to.

Thats when I started looking online for any advice.
If you could please see if you may be able to find the problem with me that would be great.

3 Replies

FACTORYJACK

MECHANIC
4,159 POSTS

Does this miss occur at all times, or under load? That may provide some insight as to what may be causing it. One way to isolate which cylinder may be causing it is to remove plug wires at the cap while the engine is running, the one that makes no change in the running is most likely the one that is missing. This procedure however, involves the risk of shock from ignition spark. While this is not to threatening to health, it is uncomfortable. If it occurs at all times, it could be an injector, an ignition related fault, or a mechanical condition(i.E. Low/no compression for several reasons).

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Sunday, June 20th, 2010 AT 4:49 PM

SIGFRIED

MEMBER
2 POSTS

Well as far as I have tested it out, I start the engine and it resumes its skipping and shaking the car a bit, I put some gas into it and it operates smoothly. Mind you this is in Neutral with E-brake on.
I will try the pulling the plug method when I can.

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Sunday, June 20th, 2010 AT 6:31 PM

FACTORYJACK

MECHANIC
4,159 POSTS

One thing to consider is when you bring the speed up, is the symptom no longer there, or is it being masked by a higher firing frequency. If it occurs at idle, and lessens, or diminishes with speed, it could indicate leakage past the valves. Have you tried torque braking it to see if it is a hard miss, or is this actually a manual transmission truck. I know you said neutral with E-brake, but it says it's automatic in the heading.

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Monday, June 21st, 2010 AT 11:07 PM