I have a 92 k2500. The engine shuts off randomly while driving every few months. The power does not shut off when this happens. I always restarts after turning the key off then starting again. Any ideas about how to fix this? 350 tbi engine, all stock
Greetings skivolks,
Welcome to the GMT400 forum! In order for the remote troubleshooters to get a better
feel for your situation, could you please answer the following questions?
* While you have owned it, did the truck
ever run
without doing this to you? (For example,
let's say that you owned it for 5 years, and the first 4 years it never did it?) Or, has the
truck done this intermittent shutdown the whole time you have owned it?
* Is the ignition switch original? Do you have 2 keys or 20+ keys on your ring?
* Is the computer currently throwing any codes? Has it ever thrown codes? Or does the SES light
come & go over several trips?
* How old are the usual tune up parts? And the distributor. Original? Newer OEM? Or aftermarket
replacement?
* Can you list all the times that it has never shut off? For example, never fails cold. Or has never
failed before running ~30 minutes. Never fails in the winter, but the failures increase at the temps rise?
* Has the Idle Air Controller ever been cleaned? For that matter, how many miles are on this engine?
* Does the failure only occur during a closed throttle decel right before a stop, or will it suddenly
cut out during a steady cruise down the highway?
* Have you experienced any other electrical intermittent problems coincident with the engine shutting off?
* Have you ever been able to check the fuel pressure when this occurs? (Thinking fuel pump as victim
of losing electrical power?)
* Anything else about the truck that you would tell me about right before I borrowed it? These old
gals tend to have some personality, and there could a clue hidden in there if you know what I mean. :0)
****
I'm trying to cover the basics. Things like a sticky IAC, thermal sensitive ICM in tired dizzy intermittently
dropping the 'Reference' signal to the computer when the going gets hot, ignition switch worn out, etc.
In other words, a random intermittent connection will present in one way, while a thermal intermittent
will have a different failure footprint.
We're sitting around a virtual campfire, so feel free to tell us as many details as you can remember. The
thing is that 30+ year old trucks have many different ways of confounding us with their shenanigans, and
in here none of us favor the use of a parts cannon. The good news is that there is a *lot* of experience
in the audience, and if you identify a quirky behavior that someone in here has also experienced/fixed, then
we may be able to sort this out in the fewest possible attempts.
Note: If we can figure out how to break this at will, then if we can be collecting live data when it happens
we will have a much more precise idea of what's going wrong.
Get back to us with the answers to the questions above, and we'll start kicking around the possibilities.