E350cdi mystery fault!
Discussion
Again.
This is on my 2009 E350cdi coupe. Generally gets used these days for 15-20mins runs to work and fairly infrequent longer runs.
Couple of months back I drove to Bristol. On the way back it went into limp mode on motorway. Stopped and restarted, out of limp mode but felt slightly ‘constrained’, not quite full power.
Took it to respected Indy. They couldn’t find much wrong, except for maybe slightly ragged turbo seal. Changed that, no difference. No codes or lights. Took their suggestion of nailing a whole bottle of Redex into 1/4 tank.
It worked, back to full power.
Now, another long run yesterday up to Bristol. Limp mode again, restarted and fine, except slight lack of power.
DPF? I’m all out of ideas.
This is on my 2009 E350cdi coupe. Generally gets used these days for 15-20mins runs to work and fairly infrequent longer runs.
Couple of months back I drove to Bristol. On the way back it went into limp mode on motorway. Stopped and restarted, out of limp mode but felt slightly ‘constrained’, not quite full power.
Took it to respected Indy. They couldn’t find much wrong, except for maybe slightly ragged turbo seal. Changed that, no difference. No codes or lights. Took their suggestion of nailing a whole bottle of Redex into 1/4 tank.
It worked, back to full power.
Now, another long run yesterday up to Bristol. Limp mode again, restarted and fine, except slight lack of power.
DPF? I’m all out of ideas.
Did they have proper mercedes diagnostics machine to read the codes?
I'd hazard a guess if the turbo seal was knackered it has broken the swirl flap motor by letting oil run down onto it.
Try unplugging it and see if the car still goes into limp mode.
You can use a resistor to fool the car that the motor is working. Pretty simple and wide known issue on these engines.
I'd hazard a guess if the turbo seal was knackered it has broken the swirl flap motor by letting oil run down onto it.
Try unplugging it and see if the car still goes into limp mode.
You can use a resistor to fool the car that the motor is working. Pretty simple and wide known issue on these engines.
yes, full STARHaha yes I see!
I actually did the DPF pressure sensor a year ago, but that’s quite an easily diagnosable thing since there is a specific code. Massively satisfying to fix that for under £50 though.
Could be a pipe gummed up, although I tend to think it’s just because I only ever rag it between work and home now, 15 mins away…
I actually did the DPF pressure sensor a year ago, but that’s quite an easily diagnosable thing since there is a specific code. Massively satisfying to fix that for under £50 though.
Could be a pipe gummed up, although I tend to think it’s just because I only ever rag it between work and home now, 15 mins away…
carreauchompeur said:
Again.
This is on my 2009 E350cdi coupe. Generally gets used these days for 15-20mins runs to work and fairly infrequent longer runs.
Couple of months back I drove to Bristol. On the way back it went into limp mode on motorway. Stopped and restarted, out of limp mode but felt slightly ‘constrained’, not quite full power.
Took it to respected Indy. They couldn’t find much wrong, except for maybe slightly ragged turbo seal. Changed that, no difference. No codes or lights. Took their suggestion of nailing a whole bottle of Redex into 1/4 tank.
It worked, back to full power.
Now, another long run yesterday up to Bristol. Limp mode again, restarted and fine, except slight lack of power.
DPF? I’m all out of ideas.
Don't drive to Bristol ? This is on my 2009 E350cdi coupe. Generally gets used these days for 15-20mins runs to work and fairly infrequent longer runs.
Couple of months back I drove to Bristol. On the way back it went into limp mode on motorway. Stopped and restarted, out of limp mode but felt slightly ‘constrained’, not quite full power.
Took it to respected Indy. They couldn’t find much wrong, except for maybe slightly ragged turbo seal. Changed that, no difference. No codes or lights. Took their suggestion of nailing a whole bottle of Redex into 1/4 tank.
It worked, back to full power.
Now, another long run yesterday up to Bristol. Limp mode again, restarted and fine, except slight lack of power.
DPF? I’m all out of ideas.
Willber said:
Does it 'kangaroo' or jerk when it goes into limp mode? Or does any jerking precede the limp mode? Reason I ask is that it could be exhaust back pressure sensor or the turbo actuator.
Nope, on the motorway I didn’t even notice until the next time I went to accelerate!I reckon it’s exhaust side rather than anything else. I have slightly adjusted my usage, I think my daily wringing of it’s neck for a short journey isn’t doing it any good!
Having just read https://www.pistonheads.com/gassing/topic.asp?h=0&... - perhaps it is something like the EGR has got gummed-up? May be when the engine is warm and it is sitting at a steady cruise on the motorway, the EGR is in a different position to when it is cold on a short blast to work?
carreauchompeur said:
Nope, on the motorway I didn’t even notice until the next time I went to accelerate!
I reckon it’s exhaust side rather than anything else. I have slightly adjusted my usage, I think my daily wringing of it’s neck for a short journey isn’t doing it any good!
When I see you for a curry next week, let me tell you a story about limp mode and the fun and games that EGR and swirl flap bits caused last year on one of those engines...I reckon it’s exhaust side rather than anything else. I have slightly adjusted my usage, I think my daily wringing of it’s neck for a short journey isn’t doing it any good!
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