Have a Major Issue
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Have a Major Issue
1994 F-250 7.3L Turbo. Pre-Stroker. So, I was driving down the road going up a hill and the throttle got stuck wide open. tried popping it with my foot, pulling on it, made sure the cruise control was off and everything. couldn't get it loose. ended up doing 80 waited until I hit another hill to help slow me down, hit the brakes and shut it down. Popped the hood. got the throttle cable to spring back. put out my front drivers caliper which was on fire. Now she start. acts like it Doesn't have compression. no smoke nothing. Before i get too deep on tearing apart the motor. I'd like a few ideas on what to look for first. I'm thinking either the exhaust manifolds or air manifolds. maybe i blew a seal or something being it got shut down at a high rpm or something. just glad I was on a country road near home with no one on the road so i could get it stopped without crashing. Any Ideas? 
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has oil but wont start. turns over nicely, but no smoke. it started immediately afterwards twice but shut down. got up to idle and died.
Had to stop it, otherwise i would've gone through a no see intersection on the other side of the hill. Didn't want to chance someone pulling onto the road.
Had to stop it, otherwise i would've gone through a no see intersection on the other side of the hill. Didn't want to chance someone pulling onto the road.
Logistics Pro
Joined: Apr 2005
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Well the fact it started and died is a good thing, your compression must be okay for it to start.
Did you run it out of fuel by chance? WOT uses a lot of diesel. Otherwise it's time to do the basics, is the glow plug system working, is there fuel getting to the filter and IP? Is the fuel shut off switch getting power?
Did you run it out of fuel by chance? WOT uses a lot of diesel. Otherwise it's time to do the basics, is the glow plug system working, is there fuel getting to the filter and IP? Is the fuel shut off switch getting power?
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2 full tanks, had just fueled it up. glow plugs appear to be working. relay clicks on and off when it hits temp. Fuel in filter. not sure where to look for fuel shut off switch. checked all the fuses. it just wont start now. doesn't seem like it's attempting to fire. just cranks over continuously.
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I appreciate all the help. hope I can figure out something. won't know until i can get back to it this weekend.
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The good news is that it was only the throttle lever that stuck, right? As long as you just had something on the outside of the pump jamming it on, then it would have been running at governed WOT(~3600 RPM); which shouldn't produce engine problems -- as long as the governor was working, you won't get it running so fast that you have valves floating or other 'over-rev' problems.
If it was something else -- a piece of plastic /inside/ the IP jamming the throttle lever to max, you could easily need a new IP... for one thing, because if you've got something floating around inside the IP, it had to have come from somewhere, and these IPs don't exactly have any 'extra' pieces. :P
I'd check for fuel when cranking, at this point -- pull the line coming out of the filter, make sure you get plenty of fuel coming out when you crank(it should /pour/ out of that fitting).
Then, if that's good, it's time to look at the IP.
If it was something else -- a piece of plastic /inside/ the IP jamming the throttle lever to max, you could easily need a new IP... for one thing, because if you've got something floating around inside the IP, it had to have come from somewhere, and these IPs don't exactly have any 'extra' pieces. :P
I'd check for fuel when cranking, at this point -- pull the line coming out of the filter, make sure you get plenty of fuel coming out when you crank(it should /pour/ out of that fitting).
Then, if that's good, it's time to look at the IP.
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it was actually the spring that goes around the throttle cable that bound up. so yes was external. i'll check to see if i get fuel at the injectors soon. would a non turbo 7.3's IP fit if I need it? i've got a spare motor. it's just non turbo. and if i get fuel at the injectors what would be the next step?
Logistics Pro
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From: Western Mass
A true "runaway" situation is when is when turning the key off doesn't shut down the engine. With no load on the engine, it can very easily overspeed and cause lots of damage before the engine decides it can't run anymore. If you leave it in gear and jam the brakes, you can safely shut down the engine by stalling it out.
Where it could be a safety issue depends on where you are driving and if there is traffic around. Obviously if you can't get it to shut down or stop before an intersection, you pull it out of gear and live to deal with the consequences of engine damage.
Which actually brings up the question to Xyeniko, did you try turning the key off when the throttle was jammed, or did you just roll with it until you could slow down?
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rolled with it, checked to make sure the cruise wasn't on, tried pulling on the pedal a few times and tried popping it with my foot to see if it'd come loose. rolled with it until i hit the hill and was able to slow it down enough that i wouldn't burn up the brakes too bad or go into that blind intersection.
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if i'd have taken it out of gear it'd have been over revving the engine and turbo. thinking it's the injector pump, had my brother in law go over and check to see if it got any fuel to the injectors, that was a no. emptied the filter and it refilled and pumped out of it. so think i'm in for the IP. just have to figure out if this spare IP off a Non-Turbo I have will work on it.