[Vwdiesel] Analyzing compression numbers - oil in injector hole?
mark at shepher.fsnet.co.uk
Fri Nov 16 16:05:43 PST 2007
A common issue. Unless engine has realy good compression/spins fast on
starter; the water temp sensor turns overrides glow plugs prematurely . A
manual override cures this and proves that nothing fundamental wrong with
----- Original Message -----
From: "Will Taygan" <william at taygan.com>
To: <vwdiesel at vwfans.com>
Sent: Friday, November 16, 2007 11:47 PM
Subject: [Vwdiesel] Analyzing compression numbers - oil in injector hole?
>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?
> Vwdiesel mailing list
> Vwdiesel at vwfans.com
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