Kangaroo

[Noddy 99]

Hello, chaps.

A symptom which has occurred 3 times since I bought the car, under identical circumstances, both before and after my remap(s):

I stop at a motorway service station (30mins to 1hr, not really counting) then floor the throttle on the slip road to rejoin the motorway. On EVERY occasion, the car has started kangaroo-ing violently. If I ease back on the throttle, the kangaroo-ing stops and the car drives normally for the rest of the journey. This only ever happens if I boot the throttle immediately after the engine has been at rest.

Other (perhaps related symptoms), again both before and after the remap/s:

Pulling away from rest or at junctions etc, there is regularly a delay between pressing the throttle and drive being taken up with a bit of a lurch. I would call it turbo lag if it wasn't so far down the rev range. It makes for jerky getaways and I can't believe that this is how a Mercedes is supposed to behave.

Other relevant factors:

98000 miles with FMBSH
Gearbox fully serviced at 93500 miles
No codes
1 Glow Plug, fuel filter and air filters replaced at 96000 miles
Fuel-cleaning additives regularly used

Before I get this to a garage, are you guys able to offer any pointers? Could it be the high-pressure fuel pump? Is that something you can test on the car?

As always, advice appreciated.

 

[M80]

My C320 did this on occasion, but would go into limp usually.
After much reading, here and t'other place, I considered that the turbo actuator might be the problem??

 

[Wighty]

I reckon glow plug actuator sticking as well , it has happened maybe 4 times on my car , probably between 40-80k miles .
Has not happened for 6 years now (50k miles )
Hours job to take the actuator off and spray clean the carbon gunk out . Small amount of high temp grease on the worm gear as well . You have nothing to lose but an hours time .

OM642 Actuator clean out and refit .

Due to the sunshine , I had done this job 3-4 years ago so I thought I would remove the actuator again and clean it out . Turbo shield removed , 3 bolts . Then the split ring on the actuator arm popped off very carefully you could tie some cotton on it , but I only did this when I refitted it ...

forums.mercedesclub.org.uk

 

[Noddy 99]

I reckon glow plug actuator sticking as well , it has happened maybe 4 times on my car , probably between 40-80k miles .
Has not happened for 6 years now (50k miles )
Hours job to take the actuator off and spray clean the carbon gunk out . Small amount of high temp grease on the worm gear as well . You have nothing to lose but an hours time .

OM642 Actuator clean out and refit .

Due to the sunshine , I had done this job 3-4 years ago so I thought I would remove the actuator again and clean it out . Turbo shield removed , 3 bolts . Then the split ring on the actuator arm popped off very carefully you could tie some cotton on it , but I only did this when I refitted it ...

forums.mercedesclub.org.uk

So that link to your other thread: is that to clean the TURBO actuator or the GLOW PLUG actuator? I know nothing about actuators...

 

[Wighty]

So that link to your other thread: is that to clean the TURBO actuator or the GLOW PLUG actuator? I know nothing about actuators...

Turbo actuator buddy , the black box on the side of the turbo by the batwing thingy .
The glow plug thingy is a relay , that’s not your cars fault .

 

[Botus]

what speed ? and how slippery was the road ?

if its got a cold intercooler and cold ambient conditons, and cold tyres but the rest is hot maybe your lighting up the tyres ?

 

[Wighty]

This was a documented problem with the om642 years ago when I first searched it on the tinternet

 

[Noddy 99]

what speed ? and how slippery was the road ?

if its got a cold intercooler and cold ambient conditons, and cold tyres but the rest is hot maybe your lighting up the tyres ?

These were in dry conditions, booting it from about 20-30 mph to merge with fast-moving traffic. No ESP light comes on. My first thought was fuel-delivery but I'm interested in M80's and Wighty's suggestions...

 

[Wighty]

https://r.search.yahoo.com/_ylt=AwrINNkbcAViYi0AxSEM34lQ;_ylu=Y29sbwNpcjIEcG9zAzEEdnRpZAMEc2VjA3Ny/RV=2/RE=1644552348/RO=10/RU=https%3a%2f%2fforums.mercedesclub.org.uk%2findex.php%3fthreads%2fw211-320-cdi-jerk-under-hard-acceleration.100015%2f/RK=2/RS=ea29PR.QCVQFJMY.Oc8DpXOvWlI-

https://r.search.yahoo.com/_ylt=AwrINNkbcAViYi0AxyEM34lQ;_ylu=Y29sbwNpcjIEcG9zAzIEdnRpZAMEc2VjA3Ny/RV=2/RE=1644552348/RO=10/RU=https%3a%2f%2fforums.mbclub.co.uk%2fthreads%2fom642-turbo-egr-inlet-port-shutoff-problem.193202%2f/RK=2/RS=IrQgRjf68SC9n6jLJPu8xOQkMTk-

2 links from many years ago

 

[Noddy 99]

https://r.search.yahoo.com/_ylt=AwrINNkbcAViYi0AxSEM34lQ;_ylu=Y29sbwNpcjIEcG9zAzEEdnRpZAMEc2VjA3Ny/RV=2/RE=1644552348/RO=10/RU=https%3a%2f%2fforums.mercedesclub.org.uk%2findex.php%3fthreads%2fw211-320-cdi-jerk-under-hard-acceleration.100015%2f/RK=2/RS=ea29PR.QCVQFJMY.Oc8DpXOvWlI-

https://r.search.yahoo.com/_ylt=AwrINNkbcAViYi0AxyEM34lQ;_ylu=Y29sbwNpcjIEcG9zAzIEdnRpZAMEc2VjA3Ny/RV=2/RE=1644552348/RO=10/RU=https%3a%2f%2fforums.mbclub.co.uk%2fthreads%2fom642-turbo-egr-inlet-port-shutoff-problem.193202%2f/RK=2/RS=IrQgRjf68SC9n6jLJPu8xOQkMTk-

2 links from many years ago

Really helpful; thank-you. A couple of pointers to the turbo/actuator there...

 

[M80]

No dash indication with my scenario.
I didn't have access to a code reader though. There may have been codes logged??

 

[Noddy 99]

No codes or any dash tell-tales on mine.

 

[Botus]

on my father's if you disconnect the link rod, the vanes on the turbo will literally fall back and forth

but common failure on a VW, its normal to gum up and cause the actuator to fail - didn't know but the make a shaving foam cleaner you spray on to un-gum it, I guess its no better than over cleaner - and the of course EGR gums up and blows its brains

maybe the 50 50 water meth I squirted in helped clean it up

 

[Wighty]

on my father's if you disconnect the link rod, the vanes on the turbo will literally fall back and forth

but common failure on a VW, its normal to gum up and cause the actuator to fail - didn't know but the make a shaving foam cleaner you spray on to un-gum it, I guess its no better than over cleaner - and the of course EGR gums up and blows its brains

maybe the 50 50 water meth I squirted in helped clean it up

Electrical contact cleaner does a good job on actuator gunk

 

[dry run]

Had exactly the same thing a few years ago on my W211 320CDi. If I remember correctly, it was something to do with a faulty boost pressure sensor in the exhaust? Anyway, took it to MBS who fixed/cahnged it and all good from then on.

 

[Botus]

the exhaust back pressure sensor does fail - £50 at Merc dealer and is really easy to fit (its the bit that tells the VGT actuator what to do). I thought they fail yes or no

Inlet port shut off motor delete (CDI2)

Hello Gentlemans. After spending hours of reading this forum I think a found something that is close to my issue. I would like to ask you for some help. Im not a jeep owner but I have the same engine in my car OM642. One day my car started to jerking when pulling the throttle pedal so I found...

forums.mercedesclub.org.uk

 

[alexanderfoti]

+1 exhaust back pressure sensor or turbo actuator

 

[Noddy 99]

OK; following Wighty's advice, it looks fairly easy to give the turbo actuator a good clean.

As for the pressure sensor, though, where is that located on an OM642 and is it a DIY job?

 

[alexanderfoti]

OK; following Wighty's advice, it looks fairly easy to give the turbo actuator a good clean.

As for the pressure sensor, though, where is that located on an OM642 and is it a DIY job?

Bolted to the top of turbo, easy DIY, small metallic sensor

 

[Noddy 99]

Bolted to the top of turbo, easy DIY, small metallic sensor

Many thanks. Have you got a pic of the sensor so I know exactly what to look for?