Good evening gentlemen,
Just after a bit of help with a VW Polo that ive got in.
Usual story of low compression on two of the cylinders, so head off to engine shop and they confirm that valve guides are shot.
Now head back on, new timing chain and full service and the car back with customer.
Two weeks later vehicle is back in with a misfire, whiteish smoke and slight oil smell.
Spark plugs out, I noticed that all of them were contaminated with oil. Compression test all good at around 250 psi each. 17"Hg of vacuum. No oil on dipstick.
Plugs cleaned up, refitted and running quite sweet. Now what I noticed is that if I pull off the oil filler cap its a bit tighter than usual and comes off with a pop then the misfire counters start rising as it runs rough.
What im wondering is is have I missed anything obvious when rebuilding it that can commonly happen if your not familiar with this engine ?
I'm thinking that I may have a problem with rings aswell.
Test plan for tomorrow is a leak down test.
The main problem I've got is I think the customer thinks im trying to pull the wool over their eyes !
Thanks, Dave