Diesel engines and electronics

[Lexion]

Tis my specialty.

Nearing 20 years of hands on,
and experimentation.

I'll be happy to assist, along
with TPM on any questions.

Please, ask away !!

Regards,
Lex

[Boondock]

glad you're good at the electronics of it cause that was never my area. i would always pass my electrical tickets to the master tech.
i never could read wiring diagrams and things like that. it's like i'm retarded when it comes to that shit.

i wish i could still wrench man. i miss it so much

[Lexion]

Dude, electronics on engines are
so easy.

Two wires. Period.

Hot and ground.

Chase the spark and ground.
Are they ok ?

Shoot the ohms.
Are they in spec ?

Isolate the component.

Simple. :)

Regards,
Lex

[MBF]

My 6.5L is parked right now. It has a bad habit of just quitting while I am driving down the road. Sometimes it will start right back up and sometimes it may be days before I can get it cranked. I worked on it for a month one time and decided to call the shop to come get it. I decided to try it one more time as I was walking by to make the call. It fired right up and I didn't have any trouble for a couple of weeks. The injection pump was rebuilt about a year and a half ago and a new fuel pump. It will be getting plenty of fuel , but will still not start. That is the second time the injection pump has been rebuilt. I had a 6.2L that had 300K and nothing was ever done to the injection pump. I think they are just having problems with the electronics on the 6.5L.

[Lexion]

I'm not very familiar with cars.

What is a 6.5L. (liter?)

Mechanical or electronic injection ?

But, to start simple, it could be
a loose ground wire. Sounds
electrical, as it is random.

You should have a ground strap
from the battery to the frame.
And, one from the starter to the
frame.

Make sure those aren't loose or
corroded.

Does the "check engine" light
come on ? If so, retrieve the codes
and post them.

Find out if your fuel tank is vented.
If so, and it's plugged; after running
a while (time depends on amt. of
fuel in the tank) it will develop a
vacuum and starve the fuel system.

Couple things to check that are
free to do.

Let us know.

Regards,
Lex

[MBF]

K 2500 Chevy truck.

Electronic injection pump.

Two batteries, both grounded to the engine I think.

The batteries are dead right now, but about 3-4 months old and heavy duty.

I need to get the starter rebuilt because I have ran it so much trying to get it to start til it must have the contacts pitted.

I don't know if the check engine light is on now, but it has been since this problem started and would say throttle position sensor.

I don't know if the tank is vented, but it has a suction when you take the cap off. It has always done that, but I have always felt that it was too much suction.

One of the things that I would do when it quit was take the fuel cap off just in case. Even changed the fuel filter.

I'll check into your recomendations and get back to you.

Thanks!

[Lexion]

First.

The starter is NOT a fuel primer.

First mistake people make.

Throttle Position Sensor should
be located at your pedal.

It's a rheostat type switch.

That means it has variable resistance.

Should be two wire.

Easy to check.

Unplug it, and check the ohms between
the two pins (or sockets) on the sensor
plug, while you slowly move it.

If the ohms move up or down with the
pedal movement, it should be ok.

In an on-road vehicle, wiring harness
failure is rare.

Let me know.

Regards,
Lex

[MBF]

Thanks, I'll check it out in a few days. We have a family member at the point of death so I will be tied up for a few days.