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CRD diesel runaway
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=9183
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Author:  spoonplugger1 [ Sat Jun 03, 2006 11:58 am ]
Post subject:  CRD diesel runaway

Was wheelin' the CRD in the mountains and while accelerating through a patch of snow on a tight trail, I had the throttle stick in the mid power range, needless to say it was interesting when the road tightened up and turned shortly thereafter. Brought the rig in with my CCV oil collection canister still hooked up to the closest dealer and they tripped a biscuit over it. Their intelligent service manager said that the cannister could have filled up with oil and caused the problem as the oil could have overfueled the engine, causing the problem. I informed him I had been a diesel mechanic for 30 years, and he needed a new place for hide his head than the one he had been using. I took him out to the rig and showed him the system again, including the clear, see through lines attached, and asked him how in the world the oil got into the intake to cause the problem without first going through the above mentioned line and leaving a indication that it had done so?
Anyhoo, they refused to work on the rig till I put the original hose back on, and they also informed me that all the oil running through the intake was quite normal and that it would never be a problem further down the road with intercooler clogging.
Scratch one more DC dealer off the list to take your rig to.

Author:  Cowcatcher [ Sat Jun 03, 2006 1:45 pm ]
Post subject: 

Hummmm.........the oil from the canister could have over fueled but the oil in the hose would not do that. We should elect this guy as president. :roll:

Did it runaway for just a short while then return to normal or did it stay that way? How did you get out of the mountains stuck at 1/2 throttle?

I had a similar problem but it was a slush mat issue. My dealer always gives me a wash and vacuum job but the lot man never hooks the slush mat back over the hook in the carpet leaving it to slide ahead and stick the throttle pedal. I check now!

Author:  spoonplugger1 [ Sat Jun 03, 2006 2:17 pm ]
Post subject: 

I don't have slush mats, and it stayed in the increased throttle position for maybe 3 minutes. What made it interesting and probably saved our bacon was that sometime during the trip of overshooting the two track and tearing up the surrounding flora and fauna the tranny was bumped out of Drive, by I guess the passenger, while jumping over rotten logs and coming to rest against a short height rock ledge just before that really big open, rock infested downhill of the ridge we were on. All I could see was daylight in front of me so I put it in reverse and got out of there. After about a minute it started slowly returning to a more normal rpm, but after it had returned to a normal idle, if I applied throttle it would very slowly come back off. Made planning a return trip down the mountain interesting.
I'd say about 10 seconds to return to an idle position on the way back for the first 15 miles. Had the flashing thunderbolt indication the whole time, even after shutting down the first time to try to figure out what was up and check for damage under the rig.
It just stratched up the skids some, took some paint off my new Rock Lizz slider on the drivers side, and I had to kick some rotten log parts out of the front end. My front plastic wasn't pretty before, but it's still all in the correct amount of attached pieces.
They had all kinds of fun codes, engine overspeed, excessive brake usage, throttle control system problem, etc.

Author:  Cowcatcher [ Sat Jun 03, 2006 2:42 pm ]
Post subject: 

Did just turning off the key ever come to mind? :lol:

My runaway came in traffic while trying to beat a new tricked out Dakota away from a stop sign, the road would narrow to 1 lane in a block or so and I wanted to be there first!. The Dakota didn't know what hit him when the turbo kicked in but then it just kept going and going and going!!!!!!! I finally just killed the ignition. Mountian roads would be a challenge.

Author:  Skyjump136 [ Sat Jun 03, 2006 2:56 pm ]
Post subject: 

Interesting...just a quick thought. I had a VW that would do this. It turned out to be a malfunctioning cruise control. Its something to check anyway. Glad you were okay. Next time just drop it in to nuetral ASAP. :D

Author:  RFCRD [ Sat Jun 03, 2006 4:53 pm ]
Post subject: 

All too common problem with run-by-wire systems, both gas and Diesel. A wet wire harness/connector, fuzzy ground, or even a high resistance wire pinch can cause issues. Throttle is usually controlled by a potentiameter which are prone to failure. Standard precaution when moping the drivers area of a bus is to be careful not to short out the throttle control. Detroit Diesel had a problem in the 90's with motor oil wicking into their fuel injector control wiring causing what DDA called "stray voltage" shorts. This stray voltage would short to ground (through the motor oil) causing elevated or even WOT.

Author:  spoonplugger1 [ Sat Jun 03, 2006 6:09 pm ]
Post subject: 

Turning off the engine did come to mind, but the flashing lightning bolt and me not knowing what it meant with the pucker factor and me alone (vehicle wise) 35-40 miles from anywhere on a Thursday afternoon made consider otherwise real quick in a snap decision. I had it in reverse and with a heavy foot on the brakes I backed out for about a 3 minute run to the main road fork. By now the throttle control was almost normal till I touched the throttle pedal.
I originally thought I had a possible real bad electrical problem (lightning bolt). Diesels need little electricity to keep running for a while anyway and I wanted to shorten my walking distance as much as possible. I wasn't on a difficult trail, but it had some tight spots due to winter blow/snow downs and rock slides. I was pretty prepared for the worst, but my passenger was not, so I made the snap decision to get the heck out as far as I could on the fuel and power I had. Once I got further down the hill on good road it was a long downhill I could coast down if necessary, and the throttle control was working better, and we'd looked up the problem in the manual, I shut off the rig. The throttle control didn't start flashing right away, but a little later I had a delay in the throttle and the flashing started again. It could have been a wiring problem as we were in partial snow and it was raining bigtime. Later as we had better conditions, everything seemed to be normal and appears fine now so far.

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