2 dead cylinders - Engine Troubleshooting


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2 dead cylinders

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Luisbigpoppy
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Apr 17, 2012, 5:38 PM

Post #1 of 4 (1971 views)

2 dead cylinders	Sign In

I have a 1991 chevy minivan w/4.3 engine with 170,000 miles. When I ground out the cylinders on the distributer cap, cylinders 3 and 5 show no change in performance. I checked for spark and they both had spark. I took out the spark plugs and they too had spark. I did a compression test on 5 and at idle it was at 25-30 lbs when I accelerated to about 2000rpm it went to about 40 to 50 lbs but the needle was rapidly fluctuating. I know a valve problem would cause it to fluctuate but I just can't see valves going out in 2 cylinders. Could this be a head gasket or a cracked head? Will either of these problems cause the gage needle to fluctuate? I don't see exaust smoke or water (sludge) in the dip stick or the in the pcv valve. Any Ideas?

Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Apr 17, 2012, 6:47 PM

Post #2 of 4 (1927 views)

Re: 2 dead cylinders	Sign In

What is the static compression on those two cylinders? If you running a dynamic compression test, those cylinders should be showing half what the static compression is. If that is true, you should have low static compression with those numbers.

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Apr 17, 2012, 6:55 PM)

briando
User

Apr 21, 2012, 3:48 PM

Post #3 of 4 (1872 views)

Re: 2 dead cylinders	Sign In

I'll tell ya what, my hyundai had to get a whole new engine because i had a mechanic put the wrong size plugs in. oh yeah, you better believe i didnt pay for that mistake

re-tired
Veteran / Moderator
re-tired profile image

Apr 22, 2012, 9:51 AM

Post #4 of 4 (1855 views)

Re: 2 dead cylinders	Sign In

what did wrong plugs in a Korean motor have to do with a GM motor?

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