2005 CDI Issues - PeachParts Mercedes-Benz Forum

rrgrassi · #1 07-10-2021, 11:37 PM

I have a friend that has a 2005 CDI with about 150K miles on it.

He has been having issues with misfire at about 80 to 85 mph, and sometimes going into limp mode.

Here is what he has done/replaced. All injectors an seals. New fuel pump, sending unit and fuel pressure regulator. Engine/transmission mounts, all filters, Stage 1 tune, EGR and EGR cooler delete, intake manifold flaps removed, straight pipe installed.

I am looking at a CDI as well.

engatwork · #2 07-11-2021, 07:28 AM

Have they hooked it up and had the codes read?

shertex · #3 07-11-2021, 09:05 AM

Did it have this symptom before the tune was done?

Phillytwotank · #4 07-11-2021, 10:56 AM

Any codes?

Skid Row Joe · #5 07-11-2021, 11:28 AM

Any fuel leaks of any sort?

In 35 years of diesel ownership, 375K miles, the only "misses" my engines have had was caused by lack of fuel delivery - and those were very slight/temporary because of having installed a new fuel filter. Take it FWIW.

Murkybenz · #6 07-11-2021, 12:39 PM

I have had a flat spot on my om642 engined Jeep GC wk between 3rd and 4th gear change, started with basically a dip in power as things slow up and then it charges along again, only lasts a few seconds and you can replicate it same revs circa 3.5k -4k and gears.
Charging off from a stand still it would still only occur as above in those gears and revs.

After a few months it started putting up p0046 actuator code , replaced this and noted the turbo linkage although operating full range had odd movement at bottom of stroke.
Month or so on egr code p0403 comes along with actuator code , basically the vanes in turbo are stuck /sticking and I need to fit new turbo.
I disconnected actuator and the stored code for that went away but the p0403 egr valve code pops up quite a lot so I'm constantly clearing it.
Be aware Mercedes will not put up an actuator code and the first thing you will get is an egr code... there is nothing wrong with egr its just popping code up because of weird airflow ecu is seeing.
The lever on the turbo that moves the vanes would go from the top all the way to the bottom of its movement but when you lifted it then the first third of its movement had no feel.
Mines now stuck solid as been busy at work and no time to get it changed yet.
Pulling the lever up to the top of its movement is the vanes open position.
I have had no low or high boost codes , Jeep doesn't seem to dish them out .
So if there is egr codes check the turbo linkage operation first , it may seem to work ok but remember there is no waste gate , the actuator moves vanes precisely for what is needed and if the vanes stick then it ecu will not see what its expecting. Those initial first dips in power are almost akin to a blocked fuel filter and being able to charge full throttle through the first few gears until hitting the dip in power make you think filters the problem until it climbs through the power dip and charges on.

rrgrassi · #7 07-11-2021, 10:40 PM

I will let him know. I also am waiting for an answer about the codes.

jay_bob · #8 07-12-2021, 06:26 AM

Quote:

Originally Posted by Murkybenz

I have had a flat spot on my om642 engined Jeep GC wk between 3rd and 4th gear change, started with basically a dip in power as things slow up and then it charges along again, only lasts a few seconds and you can replicate it same revs circa 3.5k -4k and gears.
Charging off from a stand still it would still only occur as above in those gears and revs.

After a few months it started putting up p0046 actuator code , replaced this and noted the turbo linkage although operating full range had odd movement at bottom of stroke.
Month or so on egr code p0403 comes along with actuator code , basically the vanes in turbo are stuck /sticking and I need to fit new turbo.
I disconnected actuator and the stored code for that went away but the p0403 egr valve code pops up quite a lot so I'm constantly clearing it….

Been there done that too on my son’s E320, ended up having to replace the turbo. It was the vane mechanism inside the turbo getting carboned up and this drag harmed the actuator. I tried cleaning the vanes and putting everything back together but the actuator finally died a few weeks later. Rather than having to keep pulling the turbo I went ahead and replaced it. New Garrett turbo $1250, found on Amazon.

OM642 VNT Turbo actuator issues