I'm sure I got a short.

[ShhhhhDougsHere]

Okay @alwaysFlOoReD . I can understand that.

Do have any ideas on my latest problem????

 

[ShhhhhDougsHere]

So can I test codes the same way while my engine is running?????

 

[ShhhhhDougsHere]

I can't find the:
Ignition Diagnostic Monitor
In my EVTM is there another name for it or something?

 

[Brain75]

that bucking lurching behavior I have only had with one car and it was repeated... and always the same thing - bad gas/clogged fuel... Not sending you down the wrong alley - you got ignition codes and I would think it would be ignition/electrical but any reason to suspect gas... the 8 gal you threw in was it in old containers around the farm and who knows how old?

 

[ShhhhhDougsHere]

We make it a point to use gas that we stored with in two weeks.

However that does not matter all the gas I've ever put in my truck since I've owned it has come from gas station.
I'm talking straight from the pump into my tank.

 

[ShhhhhDougsHere]

Whatever's doing it is also messing with my tachometer.

 

[alwaysFlOoReD]

Well I don't know what I've done now.
I was going up a nice size hill and I lost power and the tachometer quit working. The check engine light came on.
The truck was still running and it was puttering alone.
I made it to the top of the hill crested it.
And as I was going down the other side I put my truck and neutral hit the gas a couple times it seemed like it had power back.
But as soon as I put back into drive it right back to running like crap again.
I don't understand it.
Turned at the first Street I found pulled over.
Check to make sure all my spark plug wires are hooked up and everything.
Call my brother he told me to unhooked the battery for 10 minutes and hook the battery back up and see what I get.

My WAG (Wild Ass Guess) is a loose connection. I once was stumped for 6 months on my race truck because I always taped the connection up after disconnecting them. What I didn't realize is that one connection was dry and the little orings would roll the connection apart after taping. A little dielectric grease cured that. But it was frustrating as hell at the time.

 

[ShhhhhDougsHere]

@alwaysFlOoReD that's is what my brother Andy and I both think.
" It's a short some where. "
But the next question is where to start looking for the short.
Question after that is.
Is it really a short or is something going bad coming on working right for a few seconds then not working right for a few seconds and so on and so forth.

Whatever's going on the one code said ignition diagnostics monitor I've looked in my EVTM for that but I can't find it I don't know what it is or what it does .
Can I get some help on that please?

 

[alwaysFlOoReD]

I'm not sure what an "ignition diagnostics monitor" is. A lot of the codes have more than one type of cause.
In my head an ignition diagnostics monitor is the tool (scanner) I use to diagnose the problem, not something that is part of the vehicle.

 

[ShhhhhDougsHere]

@alwaysFlOoReD ,
I don't know what to think at this point I'm wondering if maybe the ICM might be going bad.

 

[ShhhhhDougsHere]

So @Brain75 I'm thinking that putting some gas additive in the tank wouldn't hurt nothing. Like some fuel lines and injector cleaner.
What ever it's real name is.

 

[Brain75]

most everything that you can add to your gastank is snake oil (waste of money)... there is some merit to using fuel injector cleaner to avoid disassembling the intake to get to the injectors, fuel rail, etc - lots of work.. I toss a bottle of $2 walmart (spectre) fuel injector cleaner into my GM every 6-9 mo cause it throws a lean code and that clears it up... I'm just too lazy to completely tear it apart since it barely hit 110k (and has been doing it since 60k).

I think you got electrical gremlins and that just boils down to going through the whole thing meticulously and doing the tedious work.

 

[Brain75]

I hadn't heard of the IDM abbreviation yet, so I hunted... apparently it gets received to the EEC-IV computer on Pin 4. Sounds like it comes from the Spout...(I may be wrong here, nobody seems to know for sure and I don't have the wiring books to trace it back from the computer to whatever sends it) so I would either look in your EVTM backtracking along the IDM pin at the EEC heading to whatever it comes from - figure out any place it splices through a connector and whatever sensor it comes from and start cleaning connections.

 

[ShhhhhDougsHere]

Thank you @Brain75 .

I've not been outside yet today getting ready to go outside now and starting my truck.
I need to see it will run right or not. I have to be at the parole office at 10:00 a.m..
It's a 15 minute drive when the truck is running normally. If my truck ain't running normally though I'm not going to drive it to the parole office.
Instead I'll limp it back to my brother's house and get the car that he lets me drive even though it needs an alignment REALLY BAD.

 

[ShhhhhDougsHere]

After I got out of the parole office this morning I made this video.

New video · Thursday, Mar 13, 2025 🎬

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