Hi,

I've got a 95 diesel 4x4 that sometimes stumbles, then dies or sometimes just stumbles. If I take my foot off the pedal, the engine continues at the same RPM(mis-firing still) for about 5 seconds, then the problem disappears.I have recently replaced the fuel filter, lift pump and fuel heater. The valves are correctly adjusted. The The truck has about 250k on it. The problem only arises when the engine is fully warmed-up. The last few times it began stumbling, I tried shutting off the key. She just kept going. ( fuel shutoff solenoid or running on it's own engine oil?)Sometimes, going hard on & off the throttle will clear the stumble, & sometimes it dies and will only re-start if I coast to a stop, give it a few seconds, then we are good to go for a while. I can hear a regular clicking sound during the misfiring, the sound only comes with the mis-fire.

I have a fair bit of blow-by. Could my use of 5w-30 oil cause the engine oil to get past the rings into the combustion chambers, making the engine run on oil instead of fuel? I had a problem with a worn diesel engine in a VW a few years ago, and it would run-away on it's own oil.

Thanks

 

Hello Smiffy

The only thing that comes to mind is the fuel shut off solenoid is turning on and off or is not pulling all the way up. the clicking noise is something to look at for sure and since it does clear itself sometimes i cant see the blow by causing this problem{ you would need some serious blow by}. there has been some mention about fuel lines being a problem as well causing a restriction which might be a possibility too. You should do a flow test of the fuel system to see if that may be your problem.

Good luck and BTW you spelled Orillia wrong..

Jason

 

Thanks for the speedy reply!

I replaced all of the fuel lines about a month ago, from the fuel filter all the way to the tank.

I'll check that solenoid in the morning. If anyone else is interested, I found the adjustment/check technique at http://dodgeram.org/tech/dsl/trouble..._solenoid.html


BTW, I can spell, I just can't type!

 

I have to agree, I think your solenoid may not be pulling all the way up each time.
Next time it stumbles, pop the hood and push up on the bottom of the solenoid, if it moves up any then you probably found your problem. Could be dirty which might explain the failure to shut off right away too.

 

Hey smiffy,welcome aboard. I agree with the others that the fuel solenoid is probably the culprit and the first place to look.
BTW, I used to live for many years in Barrie so know where you are.

 

I finally got this beast figured. The fuel pickup in the tank was sucking air(the screws that attach the lower half of the unit wore a hole in the fuel suction line), and the shut-off solenoid had an intermittent fault.(You guys were right )
These things accounted for 90% of the problems and having the inj. pump overhauled cured the rest. I had a #8 plate installed during the rebuild. Holy smokes, what a difference!! The truck now overtakes like a car! Best bang for the performance buck.

 

Glad you got it working! A fuel plate will definatley make a huge difference in power. Its amazing how much difference they can make. I would suggest getting a pyrometer and boost gauge if you pull much though. At least a pyrometer. This way you can keep track of your exhaust gas temperatures(EGT), and not get it to hot. A boost gauge will just tell your turbo boost, and is neat to have, but not really required. Both are great trouble shooters if something goes wrong with your engine though. Glad you got the truck running good again.

Eric