[Vwdiesel] Analyzing compression numbers - oil in injector hole?
william at taygan.com
Fri Nov 16 15:47:53 PST 2007
I compression tested the 91 ecodiesel a month ago and got
450-480-450-400. (the 94 TD was 450-500 on all 4!)
It starts well when cold, starts well when hot, but there's a zone when
it's just warm and the glow plugs don't come on that it cranks for a few
seconds before it catches. Engine? Pump? Glow Sensor? The afterglow is
7 seconds, so I just double-glow the 7 second period (no light, just
current) and things usually improve.
I found a good teaspoon of oil in the #4 injector hole (lowest
compression cylinder) when I pulled it. I've never seen that before.
There is some trace oil in the coolant overflow. Looks like it had a
blown headgasket that someone repaired and now there's just a film on
the plastic. Maybe a few pencil-dot sized specks of oil floating in
I'm not too worried about it, just curious. Ideas? Theories?
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