[Vwdiesel] More Quantum Questions

[mark shepherd]

Bill,
I agree with Brian for th source of your problems. I suspect the glowplug 
system. It isthe  behaviour of the relay timer, whichis being caused by the 
sender in the end of the head giving the I'm warm enough not to need glow 
too easily. It's a design fault,across the mk2 stuff  but  did seem 
variable.
What I would do, is start her up again let her warm up, and then attempt to 
start as before.
As soon as this starting problem rears it's ugly head.
Stop get out of the car and use a single jump lead and clamp to the positive 
on the battery and onto #1 glowplug. Run round and start her up.
Get out and remove the jump lead.
Now turn off.
Then unplug glowplug sender lead on the end of the engine.
If after a rest this helps with starting, then leave it off.
With it unplugged the g/p relay will always think the engine is cold, and 
give full amount of glow.

Report back

Mark


----- Original Message ----- 
From: "William J Toensing" <toensing at wildblue.net>
To: "VW Diesel Fans" <Vwdiesel at vwfans.com>
Sent: Friday, August 12, 2011 6:44 AM
Subject: [Vwdiesel] More Quantum Questions


>
> My Quantum still has me stumped. I let it set for several months, went out 
> to start it & it fired right up when I wanted to demonstrate its starting 
> problem. Yesterday, I wanted to get into the garage where I keep the 
> Quantum & it started right up. I moved it out of the garage & turned it 
> off. I let it sit for several hours, went to start it & it wouldn't start. 
> I decided I would get it back in the garage by first putting it in 
> reverse, let the clutch out & then used the starter to move it & it 
> started. Got it back in the garage, turned it off & again tried to restart 
> it & it wouldn't start. When it does start it sounds like the IP is 
> advanced a little to much.
>
> To refresh you on what I have done, I replaced the head gasket after 
> having the head surfaced & the valves ground in a machine shop. I had the 
> IP rebuilt. Installed new glow plugs, replaced the fuel shut off solenoid, 
> wired up a relay to the fuel solenoid so it would get electricity directly 
> from the battery.  It is as if heat generated in the engine compartment 
> causes a "vapor lock" which shouldn't happen with diesel fuel. Could the 
> fuel shut off solenoid stick in the off position when it gets hot? Any 
> other ideas for trouble shooting my Quantum?
>
> Bill Toensing, Nevada City, CA.
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