S4 N/A rebuild..low compression and no start

[RETed]

Originally Posted by JustJeff

Maybe all the smoke from burning off the oil and starter fluid clogged the cat?

Not likely...
If it can burn and allow the engine to run, it'll fly right through the cats.
I've run QUARTS of ATF in engines without plugging the stock cats up.
Starter fluid will burn clean.
I've seen blown turbos that'll empty the sump in minutes contaminate the cats but not clog them - it'll cause the exhaust to smoke for a couple hours, but cast still working.

Other thing fouled plugs or just plain flooded from him putting too much oil in the housings?

This is most likely the case.
The spark plugs do NOT like any excessive fluids (oil or gasoline) on the center electrodes.
This area is very porous and just a little bit of oil / fuel will cause a weak spark or eliminate the spark all together.


-Ted