I have a 1986 CUCV 1008 6.2l Auto. Intermittently the accelerator pedal will be hard to press. Sometimes a little, sometimes a lot. It only happens when trying to leave idle. Once you overcome the initial resistance, the throttle moves freely through the rest of the range. When the engine is off there is never any resistance. I have eliminated the cable as the problem as the resistance is felt at the injector pump with the cable disconnected. Bleeding air out at the filter or at the injectors seems to make no difference. It may do it when hot or cold. It does go away completely at times only to return without an obvious pattern. There are no other symptoms the truck starts/runs fine. The IP was rebuilt 5 years/10,000 miles ago. I searched the archives and could not find anything. Any ideas?

I know my throttle would be sticky when i put the cable in it's little "holder" on the air cleaner. The throttle would almost hang and be very slow to come down when clipped into it's holder. When i removed it, the throttle was no longer sticky. I couldn't explain it other than "don't do that again".

The cable could be ok but what about the pivot on the throttle pedal in the cab? You push the pedal, it pivots, and pulls the throttle cable. If that's sticking that could be your problem.

If everything's working up at the IP and you've confirmed the cable is ok I'd say start at the pedal. Disconnect the throttle cable from either the IP or the pedal and see if the pedal moves freely throughout it's entire range.

buncha unrelated BS

Re-read his post Dave. He says if he pulls the cable off his IP and moves the IP throttle control, he can feel the resistance. That eliminates the cable and the pedal from being at issue. Whatever his problem is, it is related to the injection pump and someone with more knowledge of those than me will have to help him out.

Re-read his post Dave. He says if he pulls the cable off his IP and moves the IP throttle control, he can feel the resistance. That eliminates the cable and the pedal from being at issue. Whatever his problem is, it is related to the injection pump and someone with more knowledge of those than me will have to help him out.

hmmmm.....wonder what could bind in the IP? Never had that issue either, so i'm no help here. Even when i had an internally rusted IP on my truck before i removed it the throttle wasn't sticky, it just made the engine smoke like hell.

I've had this occur once or twice when the pump had extreme wear in the pump. The governor pin was worn and the min max was catching and hanging on the worn pin.

Dirty metering valve can affect it somewhat too.....

10k miles on a rebuild wouldn't make you think that would happen. UNLESS it was not really rebuilt but just cleaned up and resealed.

10k miles on a rebuild wouldn't make you think that would happen. UNLESS it was not really rebuilt but just cleaned up and resealed.

Lots of dirty/bad fuel could do it too......

Welcome Slantlover, I'm thinkin' that 10000 mi in 5 years aint much drivin'. water in the fuel or even condensation in the IP can rust internal parts

Thanks for all the replies. It sounds as though it must be inside the IP. Any chance it could be that vacuum aparatus on the left side of the IP binding up? We don't put that many miles on the truck, but it is driven many times each week. So it shouldn't be a sitting problem. The only other info that I can provide is the story about the day it first did this. Some pot growers had pulled heavy brush down over one of our narrow back roads to prevent us from accessing their camp. I didn't think I could turn around and didn't want to back up on that road for a mile+. So I tried to muscle through the brush. Didn't make it. Had to manuever about a 50 point u-turn with lots of spinning. Got out alive but inherited this throttle sticking problem. Some how that high-RPM, pedal-stomping event has made it act up since. Sorry for the long post but thought it might help someone put their finger on the problem.

Thanks for all the replies. It sounds as though it must be inside the IP. Any chance it could be that vacuum aparatus on the left side of the IP binding up? We don't put that many miles on the truck, but it is driven many times each week. So it shouldn't be a sitting problem. The only other info that I can provide is the story about the day it first did this. Some pot growers had pulled heavy brush down over one of our narrow back roads to prevent us from accessing their camp. I didn't think I could turn around and didn't want to back up on that road for a mile+. So I tried to muscle through the brush. Didn't make it. Had to manuever about a 50 point u-turn with lots of spinning. Got out alive but inherited this throttle sticking problem. Some how that high-RPM, pedal-stomping event has made it act up since. Sorry for the long post but thought it might help someone put their finger on the problem.

I still can't help you on the throttle sticking, but I have to say compared to some of the books I've written on this forum, your post is very short. We actually encourage long posts here, because it makes it easier to diagnose the problem.

I think you could make some money if you could get Toyota involved-seems they need a little throttle sticking on the low speed end! LOL

That'll teach ta go moochin' pot!

the vacuum apparatus on the side of the injection pump is your cruise control servo. there is a connecting rod from the servo to the throttle lever. this connecting rod is two pieces that slide into each other. If there is dirt in there it may prevent the rod from sliding like it is supposed to.