Previously I posted this:
"This is an '85 K5 6.2L diesel Blazer. Both batteries are very new.
Now backing up a bit. In the winter when temps linger around 28-40 overnight
on the average, every morning on my way to work when I turn the ignition and
then the glow plug light is supposed to come on, it most of the time didn't.
I would have to pop the hood and poke at the switch a bit and then it would
come on. But because the switch didn't turn on or whatever causing the light
not to come on, it would turn, but not turn over and start.
So now that temps are fine, it seems that for the last couple of months or
so, every now and then when I go to start the truck, it turns strong, I can
smell fuel being supplied, but it doesn't turn over. Most of the time it
does. Especially in the mornings when the engine is cold. My understanding
is that every time you turn the key on a diesel, that the glow plug switch
has to do something.. Well sense the batteries are strong, and I think it is
getting fuel filter has been changed recently too), my guess is that the
switch is messing things up for me. What are you folks thoughts on this?
A while back during the cold months I went to Chevy parts dept. and tried to
get the switch, but you can't get it anymore. A mechanic friend at one point
told me to just bypass the switch. While it would do the glow plug thing
everytime and maybe wear them a little bit faster, that at least that switch
would be out of the way and the problem might be solved.
So if indeed the switch is the culprit, how do I bypass it safely? It is
behind the throttle body by a large wiring harness.
So to conclude, could it be this causing this? What else could it be on this
type of diesel? Again, fuel filter is fairly new, is good fuel, batteries
are fairly new, it turns very strong until I keep turning and turning hoping
it will just start.
Sorry for the long post and I hope some of you can help. Thanks much."
But I think some are confusing the switch by the firewall with the
controller on the manifold. I am curious which one you folks might think it
is with the problems announced. To add a little more, if I turn the truck
off for a bit and go to start it, it is fine. It is just when it is cooler,
but not too cool that this happens. I believe the switch by the firewall
reads the temperature of the engine and decides whether the glow plugs need
to come on or not. With that, it makes me curious if it is that or the
controller. So what do you think? Thanks much for your help so far.