I have a 6.2 liter diesel Chevrolet Suburban and it starts right away when the engine is cool. However, when the engine gets warm (not necessary hot) the engine will not start. Does anyone have any ideas what this may be? It will start and run if we use starting fluid! The engine runs good when it is started.

Jerry

Jerry,


maybe you will have better luck in the 6.2 forum, what is your cranking speed like, what kind of smoke do you have on start up lot of white??? i'm guessing as I've not much experience with 6.2s,


Starting fluid not a good thing for Diesels usualy a bandaid for something else wrong, too much SF is detrimental I'd discontinue use until you find out what is going on.


how many miles, Have you done a compression check? wait rather than ask a bunch of questions update your sig so we know what is on your truck & and post what else you have done to TS this problem

I would guess it might be the injection pump.


They changed something in the later ones to fix that problem.

Glow plug/ relay might be corroded and resisting at higher tempatures like a starter without a heatsheild.

JERRY IF YOU LIKE YOUR DIESEL USE WD-40 INSTEAD OF S/F!


S/F REMOVES ALL THE LUBRICANTS. WD-40 WORKS MUCH BETTER AND IS A LUBE ITSELF.

My money is on the thermal glow plug controller. It has several circuits in it, 3 or 5, can’t remember right now. The circuits control the glow plugs when the engine is cold, warm or hot. The main thing is that it is a piece of junk. I’ll bet that your glow plug light comes on when cold but not when warm. When mind died on my ’84 6.2L I built a 5 second timer. That arrangement has been working for years.

Hi Jerry,

I think I can tell you exactly what your problem is. If your truck has problems starting when its warm then its not the glow plugs. I have a 93 6.5 (mechanical pump) and it has the exact same problem. What happens is when the pump gets old and worn it doesn't pump as well, this is only noticeable when the engine is warm because the fuel is thinner. The problem is something in the head of the pump. Ultimately you will need to have your pump rebuilt or get a new one to fix the problem.

In the short term I have heard guys say they just carry a 4L jug of water and dump it on the pump to cool it down, I haven't tried that yet because mine still starts but just takes lots of cranking. Before spending any cash try the water thing, this will at least tell you if your on the right track

hopefully this helps

It isn't your glow plugs or the controller. The controller only activates the glow plugs when the engine is cold!!! I would suspect the injection pump. Do not use starting fluid under any circumstance. Some people have sprayed in WD-40 while craanking to aid starting.