Fluctuating Idle
Mountain Pass
Joined: Feb 2007
Posts: 183
Likes: 2
I have a similar sounding prob. but mine only does this hot. Idles a little high (900-950) and shakes like missing some cylinders. Also touchy throttle and blows soot/smoke much easier with less throttle. Pulled two codes 1211 and 0603. Ok cold. Oil changed 1000 miles ago running rotella synthectic. New napa 6637 filter 1500 miles ago. Just changed fuel filter and add some fuel additive two days 150 miles ago.
Freshman User
Joined: May 2007
Posts: 47
Likes: 0
From: Gray, TN
Just changed the oil with Delo (which I had been using) and a new fuel filter yesterday. It sat overnight and was about 40* this morning, romped when I started it for the first time and I pressed the peddle and it went away. Went to work and came out 7 hours later and it did it again. Only thing I did different yesterday was actually drained the fuel bowl before removing the filter, I usually just let it spill out.
Mountain Pass
Joined: Feb 2007
Posts: 183
Likes: 2
My rough running problem became a constant. Took it into a local diesel shop that said they thought o-rings but that it was rare at 55k. Then changed their tune and said oil press reg. for injection and replaced it which got the press. from 400-1200 psi to 500-1200 psi. Then said that the DME (main engine computer) which i believe is driver side fire wall area was bad. DME fixed it and its been ok for last 5k.
New User
Joined: Feb 2008
Posts: 3
Likes: 0
From: oregon
reply to morning romp romp
hello all ive come across the morning romp romp myself on a few of my ambulances 7.3 auto trans and found fuel leaks to be the cause...
Hear me out... IF the locks have been removed from the fuel lines they will start pumping back and forth on the hard line to the frame. This over time will collect dirt. and the dirt will eat the Orings in the fuel lines like sand paper..
sucking air into the system... Also you might wanna check your lift pump...
you can use a small mirror to look at the underside of the pump ...and as your humped over your engine place the mirror down into the valley and look up underneath the pump it has 2 small holes that start to leak ...if the pump fails
the upperhole will leak fuel the lower oil...
if it leak romp romp romp
Hear me out... IF the locks have been removed from the fuel lines they will start pumping back and forth on the hard line to the frame. This over time will collect dirt. and the dirt will eat the Orings in the fuel lines like sand paper..
sucking air into the system... Also you might wanna check your lift pump...
you can use a small mirror to look at the underside of the pump ...and as your humped over your engine place the mirror down into the valley and look up underneath the pump it has 2 small holes that start to leak ...if the pump fails
the upperhole will leak fuel the lower oil...
if it leak romp romp romp
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,111
From: Rio Rico, AZ.
Welcome to FTE Mastertech2002.
It sounds like you are talking about the older style engine in the 94.5-97 body style with the mechanical pump in the valley of the engine.
The 99-03's have a Bosch pump on the frame rail and your fuel connector o-ring theory would be a good one for that one too. Those quick connects will let a LOT of air into the system.
It sounds like you are talking about the older style engine in the 94.5-97 body style with the mechanical pump in the valley of the engine.
The 99-03's have a Bosch pump on the frame rail and your fuel connector o-ring theory would be a good one for that one too. Those quick connects will let a LOT of air into the system.
Hotshot
Joined: Jan 2008
Posts: 13,144
Likes: 11
From: Rochdale MA
What about Additives?
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Hotshot
Joined: Jan 2008
Posts: 13,144
Likes: 11
From: Rochdale MA
Your welcome Eric. The other poster had put the Lucas in. Try running Syn and see if that helps it out. If I used the block heater I wouldn't have the romps with dino either. But where your in the North Pole a combination of the block heater on a timer and Syn oil will help you out.
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