Throttle Sticks open! Help!
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Throttle Sticks open! Help!
I was driving up a gravel road at about 10mph when the engine began to rev to about 4000 RPM. I got to the top of the hill and shut off the engine and let ti sit for 15 minutes. Everytime I start it now the enfin imediatly goes to about 4000RPM. I checked the gas pedle and it seems to be working fine, I examined the linkage and it seems okay. Any suggestions???
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THANKS FOR YOUR EXPERTEES. I HAVE NOT LOOK IN THE THROTTLE BODY YET BUT I THINK IT IS SOMETHING SIMPLE ; LIKE A SPRING OR VACCUM LIND.
Originally Posted by Richardson
While driving up a gravel road at about 10mph the engine began to excellerate on it own. Over the next 10 miles this problem went from a fast iddle to 3/4 throdle. Everytime I start it now it imediatly goes to about 3400 RPM. This van has 24,000 Mls. and parked inside, very clean and maintained to the letter. The gas peddle assembly working fine, I examined the linkage and it seems okay. Any suggestions???
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91 van 7.3 letter decile, 24k, WILL NOT IDLE
THANKS FOR YOUR SUGGESTIONS!
Originally Posted by Richardson
While driving 10mph up a gravel road the engine began to excellerate on its own. Over the next 10 miles this problem went from a fast iddle to 3/4 throdle. Everytime I start it now it imediatly goes to about 3400 RPM. This van has 24,000 Mls. and parked inside, very clean and maintained to the letter. The gas peddle assembly working fine, I examined the linkage and it seems ok. Any suggestions???
Laughing Gas
Joined: Jun 2003
Posts: 1,166
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From: Chino, California
If he doesn't have a throttle body, then how does he regulate the air intake? It has to get into the engine somehow. I do not know a whole lot about diesels, but I am sure they do burn air. What is that thing at the other end of the throttle cable?
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Cross-Country
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Throttle stuck under air filter?
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Posting Guru
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From: Northeastern Pa - USA
the diesel doesnt have a throttle body. the amount of fuel is controlled by a manual control on the side of the injection pump which controlls fuel injection. the intake is only an intake for air. I suggest you look and see if the springs are still on the throttle lever on the passenger side of the pump. If they are there and the engine goes to full open, you have internal problems with the pump. OR, just per chance, you pushed the throttle down while going up hill and the cable became frayed internally and not releasing, in which case you need a new throttle cable.
Laughing Gas
Joined: Jun 2003
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From: Chino, California
I'm sorry. I don't mean to be contentious, and I am not trying to be. But I have a fuel injected engine and the throttle body only regulates air also. I don't think throttle body refers to a carburetor throttle. If it has a butterfly on it and it throttles air, is it not still a throttle body?
I have done a little research on this and have found that there are not throttle bodies on the newer 6.0's but they will be installed in the '04's. This is fascinating stuff, but it perplexes me as to how it can control air intake.
Like I said, I am not a diesel person in the least degree.
Sorry, I don't mean to hijack this man's thread.
I have done a little research on this and have found that there are not throttle bodies on the newer 6.0's but they will be installed in the '04's. This is fascinating stuff, but it perplexes me as to how it can control air intake.
Like I said, I am not a diesel person in the least degree.
Sorry, I don't mean to hijack this man's thread.
Junior User
Joined: May 2004
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These diesels get air through the demand and supply method. The injection pump regulates the amount of fuel, which causes the engine to try to speed up, which causes more air to be drawn in. No throttle body or butterfly.
Post Fiend
Joined: Nov 2003
Posts: 21,285
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From: Nutter Fort, WV
The only thing that keeps air from blowing straight through a diesel are the intake and exhaust valves. That is why we have a rather expensive vacuum pump to run our power brakes and heater controls. No throttle body, no engine vacuum, just a big hole from the air cleaner to the intake manifold. Some of us are lucky enough to have a turbo sitting on that hole, which puts about 10 to 15 pounds of pressure in the intake manifold.
Richardson,
Are you sure the throttle is all the way forward against the stop?
Exactly which engine do you have?
Richardson,
Are you sure the throttle is all the way forward against the stop?
Exactly which engine do you have?
Senior User
Joined: Jan 2004
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From: Harrison County, Texas, C
I just had something kinda like that happen to me today in my 86 250 with a 6.9. and C6. I did something I rarely do, I pushed the thottle pedal alll the way to the floor and it did not come back up. I was in the middle of town and the damned machine was running away while I am trying desprately to get the throttle to let go and mashing the brakes here and there to try to keep 7500 pounds of truck under 75 mph in the city(Very scary). By some act of God I was able to catch every light going out of town green as every place I tried to turn in was blocked. Finaly had to kill the crazed beast on my road as I could not get it under control and rolled to a steamy/smoky stop on the side of the road. I had blown my upper hose and got to looking at the throttle assembly and it was pegged out all the way open. Before I could tell what was holding it open it suddenly slammed home. Still investigating the cause of this very not cool experience.
Posting Guru
Joined: May 2004
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From: Prince George, B.C.
Y'know our '88 has this neat little thing where there is an indent on the floor, and if you push the pedal to the floor and let off just right it will jam and stay there till you tap the top of the pedal with yer foot. But if the throttle is fine I am thinking that the governor is shot, my buddies 6.2 used to do that, first time I had ever seen a diesel top 6000 Rpm, he had to choke it with a rag the key wouldn't shut it off at that rpm. Once he changed the pump it was fine. And this sounds exactly like yer problem.
Elder User
Joined: Aug 2003
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From: newfoundland canada
If the pedal is returning back off the floor i would suspect an internal ip problem(metering valve,governer,etc) There is as stated above no throtle body or butterflies,like dave said air is only regulated by the intake valves.The (rotary) ip injects directly in to a pre cup in the cyl,and does so mechanically(sp) in other words no electronics.The injectors are set at a pre determined pop off pressure and when the ip puts the extra press on the injector it pops off letting fuel into the pre cup,down into the cyl to burn,the more fuel pops the more rpms. clear as mud,lol