Rough idle and dies when started... - PeachParts Mercedes-Benz Forum

Shelcob · #1 05-05-2012, 12:41 PM

Hello all,
New here, new to Mercedes. Did a bunch of research before purchasing one and ended up with a 95' E300d with about 108k miles. So far been running pretty good. Was told when i bough it that the glow plugs and clear fuel lines had been replace just before purchase (with receipts). Go to start the car up this morning and it just sputters and dies!!! starts right up but with in 5-10 seconds it idles rough and just dies.... To add it puts out some white smoke, smells like unburnt fuel. The only thing that i have noticed (before today) driving it up until this point is randomly, it will stumble on acceleration from a stop, pick back up and be just fine. this has only happened a few times in the last month. I changed the fuel filter just to be sure, but i am not totally sure where to start on this vehicle.

Is this a bad lift pump (fuel pump)? is this a bad injector or two?

PLEASE HELP!!!!

p.s. it is running on diesel and i believe that is all that it has ever ran on...

Diesel911 · #2 05-05-2012, 01:14 PM

Quote:

Originally Posted by Shelcob

Hello all,
New here, new to Mercedes. Did a bunch of research before purchasing one and ended up with a 95' E300d with about 108k miles. So far been running pretty good. Was told when i bough it that the glow plugs and clear fuel lines had been replace just before purchase (with receipts). Go to start the car up this morning and it just sputters and dies!!! starts right up but with in 5-10 seconds it idles rough and just dies.... To add it puts out some white smoke, smells like unburnt fuel. The only thing that i have noticed (before today) driving it up until this point is randomly, it will stumble on acceleration from a stop, pick back up and be just fine. this has only happened a few times in the last month. I changed the fuel filter just to be sure, but i am not totally sure where to start on this vehicle.

Is this a bad lift pump (fuel pump)? is this a bad injector or two?

PLEASE HELP!!!!

p.s. it is running on diesel and i believe that is all that it has ever ran on...

It could be a bad lift Pump or an Air leak.

I do not know if the Overflow/Fuel Pressure Relief Valve can cause the issue you are having or not but Members have said there is some Plastic piece in side that can have issues.

Newer Lift Pump Repair with Disc Valves
http://www.peachparts.com/shopforum/showthread.php?t=285915
606 Fuel/Lift Pump Rebuild
http://www.peachparts.com/shopforum/showthread.php?t=288883

Shelcob · #3 05-09-2012, 11:50 PM

So i have changed the tank strainer, in the process of changing the lift pump, check the pre-filter (kind of odd, has what looks like an air soft BB in the screen), and changed the main filter... all looked good. Pump seemed to have some issue (not completely sure that is the entire problem) is there anything else that can cause blockage in the fuel system?

thanks

Shelcob · #4 05-10-2012, 12:01 AM

and the pressure relief valve on top of the IP seems to hold pressure...

A couple other question for you!
As i was taking off the COP i was testing the vacuum diaphragms for the two valves in the intake, both were good but the one in the intake manifold itself took almost 10-15 inHg to open the butterfly! is this normal? what should it take and how much vacuum can the pump generate? Second, what is the best way to clean the intake and COP? seems to be a lot of crud built up in there!!!

thanks