[Vwdiesel] Analyzing compression numbers - oil in injector hole?

[Will Taygan]

Just to clarify:  The light does not come on, but the relay still
energizes the glow plugs for the 7 seconds (post glow??)

Also, the oil was in the injector hole, I'm not sure how it would get
from the combustion chamber past the heat shield, so maybe there's a
crack??  Everything else looked fine, just the lower compression.

Will.

On Sat, 2007-11-17 at 00:54 +0000, mark shepherd wrote:
> I think pulling the sensor wire from the coolant will do it; but then you 
> always get the full cycle.
> In my one 'Q' I had the relay wired up in the engine compartment and powered 
> the relay via a spare switch on the instrument panel. I could then switch 
> the relay off after I started the car, leaving it gave the full cycle.
> Off then back on gives a new cycle.
> 
> Leaving switch off when parked made it steal proof[ish]
> 
> I also had [still have ;o) ] a light bulb to the glowplug bus bar to see the 
> truth...
> 
> Mark
> 
> 
> ----- Original Message ----- 
> From: "raymond greeley" <rgreeley2 at hotmail.com>
> To: "mark shepherd" <mark at shepher.fsnet.co.uk>; "Vwdiesel at vwfans.com" 
> <vwdiesel at vwfans.com>
> Sent: Saturday, November 17, 2007 12:36 AM
> Subject: Re: [Vwdiesel] Analyzing compression numbers - oil in injector 
> hole?
> 
> 
> 
> Mine does not give me 7 seconds of glow, so how do i over ride the coolant 
> sensor, disconnect the lead. it starts with min turns when cold and 
> immediatly after shut off though in that inbetween range it can take several 
> cranks to get going again.
> Oh, it is a 1.9 idi engine though in a 91 jetta.
> ray> From: mark at shepher.fsnet.co.uk> To: Vwdiesel at vwfans.com; 
> william at taygan.com> Date: Sat, 17 Nov 2007 00:05:43 +0000> Subject: Re: 
> [Vwdiesel] Analyzing compression numbers - oil in injector hole?> > 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 > engine 
> :o)> > Mark> > > > > > > > > > > > > > > > > > > ----- 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> > there.> 
>  >> > I'm not too worried about it, just curious. Ideas? Theories?> >> > 
> Will.> >> > _______________________________________________> > Vwdiesel 

>