'83 OM617 wont shutoff...even with manual lever

[SurfRodder]

Hello all,

I have recently been having issues with my car not turning off. Symptoms first appeared immeidately after removing/replacing the dash to do some wiring and bulb replacements, etc.

I assumed that I had inadvertently knocked one of the vacuum lines off from the ignition switch, but I checked those and they were still fine/no leaks, etc.

After I checked that, I went to shut her off at the manual stop lever and it stumbles a bit, idles a little lower but doesnt shutoff. I can remove the linkage from the lever and get it to shutoff by pulling pretty hard on it, but it just barely shuts down.

I've been stalling the car (manual conversion) when I need to shut it down (for the last week or so) but that's getting to be annoying and I'm not sure what long term effects of that will be.

Anyway, I'm wondering if anyone has any ideas about what I can try to do while troubleshooting this issue. Thanks in advance for your time!

Josh
p.s. this injection pump is the original one with 325K or so on it but I replaced the vac shutoff about 25K ago. perhaps that has somehow gone bad and is now preventing the manual shutdown from properly engaging?

I have a fresh rebuilt IP that I can install, but it has larger elements and I don't have the time to modify anything and install the larger VNT that I have for it so I don't think that's an option, but may try it just to see.

[kerry]

Try pulling a vacuum with a mity vac directly on the shut off valve and see if it works.

[SurfRodder]

Originally Posted by kerry

Try pulling a vacuum with a mity vac directly on the shut off valve and see if it works.

i forgot to mention that i also hooked up the vac shutoff directly to the main vac line before trying the manual lever. i will try my hand pump tomorrow though, but im nit holding my breath. thanks for the suggestion though!

[Thirdem]

Are you sure you didn't accidently leave a wire unhooked? That's what I'd first look at. Other than that, sounds like a vacuum issue. Good luck!!

[SurfRodder]

Originally Posted by Thirdem

Are you sure you didn't accidently leave a wire unhooked? That's what I'd first look at. Other than that, sounds like a vacuum issue. Good luck!!

Everything electrical seems to work now (fixed several issues while I had the dash off), the only thing that I'm having issues with is the vacuum and manual shutoff. It really blows my mind that the manual shutdown lever doesn't work to kill it.

I'm thinking theres some binding in the pump internals or vacuum shutoff solenoid that isn't allowing for it to cut fuel completely, but its really strange that it did just happen to quit working right after I did all the electrical work. I cannot think of anything electrical that would cause this issue.

Anyone else have any ideas?

[Orv]

Depending on the linkage adjustment it can be impossible for the manual stop lever to pull the linkage all the way to the cutoff position. If the manual stop slows the idle down, try tugging on the link going down to the pump and see if that kills it.

I've been unable to find a linkage adjustment setting on my '81 that will both allow the manual stop to work and give me full accelerator travel, even after repeatedly adjusting it per the book.

[SurfRodder]

Originally Posted by Orv

try tugging on the link going down to the pump and see if that kills it.

yeah, if I pop the ball-joint deal on the linkage and pull a lot, it will die, but way more force is necessary to make that happen than it should be.... the strangest thing is that it just happened all of a sudden, no indication of it possibly going bad...stranger still is that it happened right after doing the electrical stuff.

Im at a loss unless it is just a very odd coincidence that an internal pump part failed at the same time I fixed some of the wiring behind the dash...

[reinventthewheel]

yeah, if I pop the ball-joint deal on the linkage and pull a lot, it will die, but way more force is necessary to make that happen than it should be

With the engine off, can you hear that switch clicking when you push the manual shutoff lever? If not, try adjusting the screw on the IP to make the shut-off switch move lower

Im at a loss unless it is just a very odd coincidence that an internal pump part failed at the same time I fixed some of the wiring behind the dash...

I've seen many strange coincidences like this that by normal rationale should be connected, but in a machine as complicated as an auto are nothing more than that--strange coincidences.

[SurfRodder]

Originally Posted by lacolocho

With the engine off, can you hear that switch clicking when you push the manual shutoff lever?

I will check this tomorrow when I work on it, but just so I'm clear, the clicking part should be the damper screw?

[reinventthewheel]

I will check this tomorrow when I work on it, but just so I'm clear, the clicking part should be the damper screw?

There's a tiny rod underneath it that will click when it moves up, it's activated by the throttle linkage, which should be just barely or almost touching it when at idle.

[SurfRodder]

Originally Posted by lacolocho

There's a tiny rod underneath it that will click when it moves up, it's activated by the throttle linkage, which should be just barely or almost touching it when at idle.

ok, thanks man.

[reinventthewheel]

ok, thanks man.

lady

good luck