ML 270 cdi misfire

[kebo57]

I was on cruise set at about 85 mph on the motor way, weather was raining wind buffeting I was climbing a hill not steep enough to use the kick down, when I noticed it but it felt like the wind buffeting.
I knocked the cruise of and accelerated hard and it did it again it’s approaching 3000 revs and over sort of when your using the torque of the engine I can make it do it ever time.
I tried it again weather fine no wind same as above but if you accelerate from standing start reving up to 4000 revs in the lower gears it’s ok.
Just hammered it up hill, slip road to motor way and levelled out at about 70 mph just tickling throttle it misfired seamed to be worse bad enough to take the next exit.
I’ve been using the cheapest diesel at the pumps, also done 500 mile round trip to Godalming last week no problem.
Still if I accelerate in low gears it ok.

 

[kebo57]

I was on cruise set at about 85 mph on the motor way, weather was raining wind buffeting I was climbing a hill not steep enough to use the kick down, when I noticed it but it felt like the wind buffeting.
I knocked the cruise of and accelerated hard and it did it again it’s approaching 3000 revs and over sort of when your using the torque of the engine I can make it do it ever time.
I tried it again weather fine no wind same as above but if you accelerate from standing start reving up to 4000 revs in the lower gears it’s ok.
Just hammered it up hill, slip road to motor way and levelled out at about 70 mph just tickling throttle it misfired seamed to be worse bad enough to take the next exit.
I’ve been using the cheapest diesel at the pumps, also done 500 mile round trip to Godalming last week no problem.
Still if I accelerate in low gears it ok.

Could any one help me regarding the quote above as I would like to rectify the problem

Thanks anybody

 

[blassberg]

possible water in the electrics? It was raining the first time.

 

[kebo57]

Thanks for the reply

maybe it will dry out could this be a injector ive read posts about cleaning fluid for injectors also crank shaft sensor.

Thanks any way

 

[blassberg]

don't know sorry. Mine went back after 106,000 miles - good to see you're up to 150k

 

[carabind]

You mentioned you use the cheapest diesel. As a start (will cost nothing!) try and fill up next time with a decent named brand of diesel, the detergents will help clean out the fuel system (and your injectors) and give the engine something decent to digest. There's been plenty of warnings before about using supermarket petrol which don't have the desired additives. It may take a couple of tankfulls to make a difference. The 2.7 egine is pretty reliable - what's your mileage?

 

[kebo57]

Hi there carabind my mileage is 150k although I’ve only owned the car for two months I will try what you say, today
I cleaned the MAF & checked the injectors for leaks good connections etc all ok but noticed no 5 injector had vice grip rash, all the pipe connection had spanner witness marks
I’ve put some injector cleaner in fuel tank, at almost reserve showing don't no if full tank would be best.
Anyway I tested motor and it seems to be better, round town it as smooth as silk but 75-85 mph with slight acceleration its still there, say if you were sat in lamp post seat you probably wouldn't notice it.
Tomorrow I change the fuel filter if I can find a thread to suit
Sorry if I don’t respond immediately as I still on dialup but thats one think I can sort
Thanks once again everybody

 

[kebo57]

I’ve changed the fuel filter should of primed the new one but didn't so it took a couple of min's to fill up with diesel.
I opened the old one up but there's hardly any sediment in it. Also cleaned the intercooler not much in there either fairly simple job by the way but along with the fuel filter it seems a bit better
I spoke to a guy that repairs MB vans mainly it about £35 to run up on diagnostic machine but it won't show up individual malfunctioning injectors also he recons that MB dealer machine won't either.
When I spoke MB station they said their M/C would pinpoint faults down to the last detail.
Any help would be much appreciated
Thanks Kevin

 

[kebo57]

ml 270 Top hose callapse

After completion of the said tasks above
I restarted engine and revved it up by hand under bonnet
I noticed that the top hose was collapsing when I held revs on when I let it go back on tick over hose recovered to normal shape

Why would this happen

 

[IAN MAC]

Change the hose, its obviously weak. Had the same on my van rercently

 

[kebo57]

Thanks for the reply Ian Mac

 

[kebo57]

Evening all "yes it's the boring misfire thread again"
I’ve still got the misfire I had the motor plugged in to a diagnostic machine yesterday there were 8 faults that I had cancelled not any that were serious enough to cause the problem

I went for test drive still same as before went back to recheck and it had Zero faults.

Next Idea is to run with laptop plugged in and reproduce misfire
Would this then show the error that is causing the problem?
Any help would be much appreciated

 

[television]

I think that you have to change the crankshaft sensor, the fault is not down to injectors.

Malcolm

 

[kebo57]

Thanks Malcolm

What would be the price of the crankshaft sensor
and is there any threads regarding replacing it on the ml 270

Kevin

 

[kebo57]

crankshaft sensor

I think that you have to change the crankshaft sensor, the fault is not down to injectors.

Malcolm

Malcolm
I now that you are a very busy man with some 7000 posts, as you say above change the crankshaft sensor. Could I do this myself our does it need to be matched to the ECU.
Also I can't find a thread as to the location of it, only some engines have them on the bell housing others near the crank shaft pulley.

Any help would be much appreciated

Many thanks Kevin

 

[television]

http://www.detali.ru/cat/oem_mb2.as...GM=716.644&CT=M&cat=21T&SID=15&SGR=105&SGN=03


Its item 011,very cheap and simple to change. Please dont shoot me if I am wrong,but it has fixed a lot of cars recently. It is not data sensitive, so no codes.

malcolm

 

[kebo57]

link

Thanks once again
I can't open the link from my place of work as my access has been denied I must wait till the morning when I get home unless there is another way

Kevin

 

[biglee]

sorry I have a similar problem is part 011 the camshaft sender unit and 029 the crankshaft sender unit. Please can you say which one should be changed thanks Biglee.

 

[kebo57]

Hi and good day to you all yes its me again after more information but with nothing to bring to the party.
I still have what seams to be a miss fire it hasn’t got any worse over the last couple of months I have had a diagnostic analysis done on the vehicle by Frank Massey at Automotive Diagnostic Solutions
Unit 5, PrestonTechnologyPark
Marsh Lane, Preston, Lancashire PR1 8UQ
www.ads-global.co.uk
They tested all aspects that might be relating to the miss fire but every thing was in tolerance, they invited me to sit in on a 30 mile test drive Frank had the laptop on his Knee whilst his colleague drove my motor, they monitored the vehicle all through the test even when we replicated the miss fire, Frank explained to me in detail what test they were doing and answered all my questions but still no obvious fault they spent some three hours with my motor.
He said he would consult further the following day which he did explaining that on high mileage 270’s the fault could lie within the inlet manifold there could be a build up of carbon on the swivel flaps which are operated with a solenoid also the exhaust gas recirculation valve.
Is this a big job to remove the inlet manifold, there will be gaskets and other thing that I will need to replace

The whole cost of test was £75.00 + vat, I thought that was very good value.

There were some fault codes logged see below

P1470 charge pressure control open circuit [stored]

P0105 b28 (pressure sensor) the signal voltage is to low. [stored]

P0100 b2/5 (hot film MAF sensor) the signal voltage is to low. [stored]

P1354 Synchronization between crankshaft and camshaft FREQUENCY OF CAMSHAFT SIGNAL IS TO HIGH. [STORED]

P1354 Synchronization between crankshaft and camshaft NO CAMSHAFT SIGNAL [STORED]

116 STARTER LOCKOUT CONTACT AND/OR ATF TEMPERATURE IS FAULTY

146 OVERSPEED SENSOR (n3) OR EXTERNALLY TOOTHED DISK CARRIER

147 THE GEAR IS IMPULSABLE OR TRANSSMITION IS SLIPPING

Some of these fault are due to me unplugging things could anyone help regarding the said problem above many thanks Kevin
PS MAF is reading 4.6 volts & said to be ok

 

[kebo57]

ML 270 missfire

I think that you have to change the crankshaft sensor, the fault is not down to injectors.

Malcolm

Hi Malcolm I’ve replaced the crankshaft sensor but the problem is still the same, you mentioned in an earlier post about Frank Massey.
I took the motor to him I was very impressed the results are in this thread
But they are a bit to in-depth for me to decipher any help would be greatly appreciated.

Kevin