changed glow plug relay, still wont start cold

[darkostoj]

whats the next thing to check? It starts fine when warm or plugged in. When cold it just turns over.

[grkstl2]

did you check the glow plugs themselves? What have you done so far other than just the relay?

[audiocontr]

Mine does the same. I have to push the pedal down to start it (which is standard starting procedure in the owners manual).

Could be your oil as well by the way

[SuperCrutyPS]

Have you checked to see if the GPR is, in fact, putting out voltage to the GPs? Could the GPs or wiring to the GPs be faulty?
Do you try to start as soon as the WTS light goes out? When it's cold the GPR stays on for up to 2 minutes. Have you tried waiting longer after the WTS light goes to try to start?

Sometimes here in CA it gets to the cold-for-us 20*s - I will count to 30 after the WTS light goes out. Seems to help some.

Just some thoughts - It's what I would check. Hope it gives you a direction to go.

[mgassel]

Does it ever act like a engine with the timming off?
If it does chances are you could have a bad injector or more.
But I would do all the trouble shooting prior to replacing any injectors.

[whitejohn]

ive found alot of trucks that the valve cover gaskets bad and cause that problem

[RIVER-RAT]

Originally Posted by darkostoj

whats the next thing to check? It starts fine when warm or plugged in. When cold it just turns over.

My '02 is the same way....it will eventually start, but it takes a little while. I had my oil changed at Firestone not to long ago and I can't remember what they put in it. When its time to change it again I'm gonna make sure they put 5w40 (I think that's what was recommended by a few guys on here, if I remember correctly. Damn this getting old thing! )

[jesilvas]

Check GPR for proper operation and voltage
Check GPs for proper resistance. There is a sticky. Search it.
Check the UVCHs for good connections as they supply power to the GPs.
Last fuel filter change?
Last oil change and what weight?

Pushing pedal down is only going to help once it's started, and that has to do with increasing the IPR duty cycle and ICP, which helps flow that cold, thick oil at those high pressures better. That's just a thick oil and weaker HPOP.

[RIVER-RAT]

Ok, so after reading this, I decided not to plug my truck in last night and try to start the dang thing "cold". The overnight low here was in the low 20's.

Went out this morning and turned the key, let the glow plugs heat up for about 30 seconds or so and cranked. No start. Let off and tried again...no start. Re-cycled the key and GP's....no start. Noticed some white smoke that smelled like fuel, so I'm assuming it's getting plenty of fuel. Re-cycled the key and let the GP's warm for about 30-40 seconds and she fired up.

What do you experienced guys think??? Change out the GP's and the relay?? If I plug it in, I have absolutely ZERO problem starting it up.

[stroker007]

im the same way man, it says i have 4 glow plugs out, and dont know whether to change the module or glow plugs.