Ok so if you read the post that i made a few days ago my truck would "Run away" when you hit the accel. pedal. I was getting a couple codes for the ACC. but stupid me didnt right them down. So i had my mind set on it was the Accel. pedal. So i got a new one and low and behold it still does it. Here is the problem that i dont understand. Last night (i just got my new pedal today) I went to move the truck so i started it up and the RPM's shot to 23-2500 So i shut it off. I started it back up and i didnt the same thing and sounded like it was running on 7 cylinders so i put it in gear and the rpms went back down to about 700 rpm and all sounded good. Granted that i didnt have to move it far i just wanted to move it backwards about 100 feet. So then i just let it go and i would worry about it tomorrow when the new pedal gets here. So the next day came and i took both the pos. battery terminals off and put the new pedal on and then reconnected the batterys. Started and it was still doing the the same thing runs like shat until you put it in gear then all is well. So i tried to drive it around the subdivsion and it still felt like it was all or nothing with the pedal, like you were flooring it or you were ideling. I kept driving it and it seemed to get better. I kept driving and it kept feeling like the pedal was getting more and more "feel" to it. So i started driving around town and below 45 it felt almost normal. I jumped on the highway and then i felt like it did before it was all or nothing. and that is where i am now. I just pulled codes after the highway trip and i got p0236 and po216. i know that the one is a boost code and i just made my own turbo master and set it 9 lbs and 11lbs when the tc is locked. but the other one is was worries me. when running now it idels fine and when i hit the pedal it slowly startes to "Runaway." i opened the T valve and the filter air bleed and i get alot of fuel that comes out. i have a new lift pump as of a few monthes ago also.

Thanks Alex

just an update. I left the batteries unhooked for about 45 mins and then reconnected them and went for a drive. Heres what i came up with.

- under 45 mph the truck drives like it use to every thing normal the TC locks at 43 or so and then the cruise control is turned on at about 35 all is normal and works perfectly
-Over 45 the shat hits the fan the TC doesnt stay locked the pedal is either on or off and when you use the cruise control it acts just like the pedal on or off.

Thanks again and sorry for the first post being so long

Alex

Don't know what it is called on a diesel, but if a gas turbine engine were doing that, I'd follow the troubleshooting for "bootstrapping".

Sounds like the boost is building too soon, and there is enough surplus fuel to allow the engine to spool up above the throttle setting.

Do you have the fuel turned up?

nope but now that you say that im going to go take the turbo master off and see what happens


Thanks Alex

TM would not cause run aways, IIRC runaway is a pure IP problem, fuel solenoid on end of the IP, maybe Diesel Pro will weigh in.

Have you tried running on cruise to see if it is different, cruise control is direct link to PCM and APP is out of the loop.

nope but now that you say that im going to go take the turbo master off and see what happens


Thanks Alex


Hey Stroked,

I feel your pain, I've got the same symptoms at ~55mph.

If the turbo seals fail could it leak enough oil into the intake to cause trouble at cruse? I'm going to take off the intake manifold tomorrow and see it has any effect.

Al

Yes i did try the cruise while on the high way and it still did the same thing (on or off)

And i just had my old man drive the truck and he says that the peddal is still very touchy so i guess it seems that im getting use to it and its not getting better.

On the turbo seals thing, If it was wouldnt i see alot of white smoke while driving or even running for that matter?

Alex

The fuel solenoid armature shaft has a screw broken or loose. Can damage engine if it revs to high. Quantum had some pics here. Do a search for armature shaft or fuel solenoid armature.

http://dieselplace.com/forum/showthread.php?t=13455&highlight=armature

PM me for more info

Thanks DP that was wording I was trying to recall

P0216 is for th timing control circuit. Stepper motor on the passenger side of the IP. Check the connections and wire integrity,if it's all good it will need a IP. Seen it a few times here.

Because it throwing a po216 that means its not the fuel sol.? Correct. i just checked all the wires and they look to be in good shape. I pulled the plug off and then put it back on and still does the same thing.

I pulled the turbo and crankcase vent on the truck Wednesday night. It was after dark, but the cloud of smoke emanating from the turbo compressor output was easy to see. Near as I can tell, the amount of oil entering the intake during operation is probably sufficient to cause the surge/touchy throttle response problem. Looks like both the turbo oil seals and possibly some stuck/worn piston rings together are creating the problem.

I will test one more time by unhooking the turbo compressor outlet and providing a vent hose to get the smoke out from under the hood. Wednesday I opened the intake and went for a drive, but did not provide vent pipe for turbo, so it was still sucking most of the smoke back through the engine.

If venting the turbo/crankcase away from intake cures throttle surge then I will assume that PCM and IP are OK and oil blow by/turbo leak is problem. If so, I will probably just drive truck until it dies. :cool:
Al

Al have you tried running Nr2 only, possibly just possibly your "brew" is playing up with optic sensor, how long have you been on gas/WVO operation ever check the lubricity of that to see where it falls in with Nr2, or do you also run a lubricity additive. It's the cutting with gas I'm curious about as yours is 1st one I've seen running gas to cut WVO

Al have you tried running Nr2 only, possibly just possibly your "brew" is playing up with optic sensor, how long have you been on gas/WVO operation ever check the lubricity of that to see where it falls in with Nr2, or do you also run a lubricity additive. It's the cutting with gas I'm curious about as yours is 1st one I've seen running gas to cut WVO

Hi Turbine,

Yep, checked that, switched back to 100% Dino-Diesel about end of MAY. No difference.

I run a little Powerservice Cetane boost to keep the Cetane rating near where it should be.

As for lubricating properties, that's a good question, but the viscosity is still higher than #2 Diesel and most parts use hydrodynamic lubrication (film wetting) anyway. I do have some concerns about wear from unfiltered particulates, but I bought the truck last year with 145K on it and found that the air filter tube to the turbo was not on properly and the turbo inlet had some grit in it. (we have lots of sand up here)

I can not rull out possibility of stuck/broken rings inside engine. A leak down check at this point would be nice.
Al

I pulled the turbo and crankcase vent on the truck Wednesday night. It was after dark, but the cloud of smoke emanating from the turbo compressor output was easy to see. Near as I can tell, the amount of oil entering the intake during operation is probably sufficient to cause the surge/touchy throttle response problem. Looks like both the turbo oil seals and possibly some stuck/worn piston rings together are creating the problem.

I will test one more time by unhooking the turbo compressor outlet and providing a vent hose to get the smoke out from under the hood. Wednesday I opened the intake and went for a drive, but did not provide vent pipe for turbo, so it was still sucking most of the smoke back through the engine.

If venting the turbo/crankcase away from intake cures throttle surge then I will assume that PCM and IP are OK and oil blow by/turbo leak is problem. If so, I will probably just drive truck until it dies. :cool:
Al


My brothers truck just did this very same thing, turbo seals and bushings were gone, tons of side movement! We replaced the turbo and all is good again!!

I am new here, but I seem to be having the same problem with runaway throttle. It revs up to 2000rpm at start and stays there in gear or park. If I give it fuel it will red line so I have to shut it down. I have changed the PMD/FSD and the pedel with no luck. I am getting codes 18, 54, 84, and 99. I have also disconected the batterys and let it sit for a day with no results... any ideas?

Welcome!

The fuel solenoid armature shaft has a screw broken or loose. Can damage engine if it revs to high.

http://dieselplace.com/forum/showthread.php?t=13455&highlight=armature

Thank you DieselPro! Sorry for being 'slow' but I am maybe missing something here.. it says in that link that the armature is unserviceable... is it possible to fix the broken screw or should I replace the IP?

Welcome!

The fuel solenoid armature shaft has a screw broken or loose. Can damage engine if it revs to high.

http://dieselplace.com/forum/showthread.php?t=13455&highlight=armature



this IS your problem.

Thank you DieselPro! Sorry for being 'slow' but I am maybe missing something here.. it says in that link that the armature is unserviceable... is it possible to fix the broken screw or should I replace the IP?

Somewhat difficult to repair on vehicle but has been done before.

http://dieselplace.com/forum/showthread.php?t=89886&highlight=armature

thank you cheapskate and again DieselPro for your replys!

So now ive been told IP and the FS. What is it?

Alex

Alex a complete new or reman IP gets you a working fuel solenoid & tested IP (my recommendation) solenoid is integral part of the IP (do not confuse solenoid with PMD/FSD which upon PCM command modulates current for the fuel solenoid to open/close); or you can try to self repair of the IP with new solenoid but fixing a used IP is a band aid IMO; if armature broke already, what else is pending. Confer with Diesel Pro in PM he sees a lot of IPs in his line of work and might be able to impart some better wisdom to you.