m38 operates sometimes in 3 cylinder......why?

baios · Post by **baios** » Mon Apr 16, 2018 6:43 am

Hi my m38 operates sometimes with the 3 cylinders!!!! When it is cold and i fired it up at least 90% it operates with 3cylinders. Then after it warms up it runs ok.

I checked the spurk plugs and i saw in one of them oil.... not too much but it was there. i also checked the spurk cables and was ok. After all i take it for a ride and as it works ok then suddenly again 3 cylinders for 10 minutes and then in 4 again!!!!!

i m confused what is it wrong!!!! A friend told me to make a test compresion and see if all 4 cylinders have the correct presure!!!!!!

What should i chek?????

mdainsd · Post by **mdainsd** » Mon Apr 16, 2018 7:45 am

A compression test is a good start. Also a cylinder leak down test will reveal the condition of the piston rings.

It may be as simple as a tired spark plug. You could switch the oily one with another and see if the problem follows that plug or if the problem stays with the same cylinder.

4x4M38 · Post by **4x4M38** » Mon Apr 16, 2018 8:46 am

That’s pretty intermittent.

Also check to see if you have a distributor
cap with a hairline crack, and that your
spark plug wires are not dried out and cracking