Slow starting when warm - page 2 - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

#15 by Robb on 19 Oct, 2010 14:49
Always one for giving things a try and seeing if they actually work, not one for basing facts on theories.

I do believe my injection pump timing is advanced at the moment which is an issue I will be addressing ASAP mainly when I find someone who can actually help me with it.

Will also be looking at improving the start motor speed either via better earths, cleaning or replacement.

May also look into making one of those uprated custom made glow plug setups.

Hopefully between those, other than the fault purely being a worn engine I should be able to get the car starting nicely when warm with the plug back in!

Thanks for the help, least I know what to check and move forward with addressing this issue now. One of many with the car hehe
#16 by Mark(The Miser)UK on 19 Oct, 2010 16:29
Quote from: regcheeseman on 19 Oct, 2010 14:40
Quote
Tried your method today Reg and it worked a treat car now fires up first time even when warm,

Funny that! Everyone who ACTUALLY tries it has the same result!

The reasons? Possibly

faulty glow plug relay / temp sender meaning the plugs don't come on when the maybe should

worn engine

poorly set timing

slow cranking speed

Or a combination of all of them?

I think it's mainly because the engine warm sensor is only functional on a nearly new engine.
I suspect that the relay would work better for something that was bigger. EG a lorry.
Even the GTD suffered slightly when warm.
The whole setup was an uneccessary complication.
Maybe there is an adjustment to the sensor circuit, that always gives some glow, unless engine truely hot.
It would appear that as pulling the wire results in near immediate starting, the device may not be proportional, at all and merely a logic decision of is engine cold or is it not.
Glowplugs would start my engine with relative ease at compression pressures below that of a petrol engine, but struggle if one died...