C220 CDI - no power

[vexed daddy]

Hi Folks,

I've got a W203 C220 CDI. Lately it would have pulled like a train when started, then after a while, there was no power. If it was turned off and on again, it would be good as new, for another ten minutes!

Now theres no power all the time. It wont rev above 3000rpm. I had it plugged into a diagnostic computer and the only fault that wouldnt clear was the "Inlet port shutoff motor 1189-016"

If thats the Pierberg unit just before the inlet manifold, it was all gunged up inside. I took it out, cleaned it and, using a syringe, checked that it was working properly.

The car is just the same as before!

Anybody got any ideas????


Stephen

 

[twistedsanity]

i had exactly the same problem today, found a split in the pre throttle body air intake hose, gaffer taped it, problem solved

 

[vexed daddy]

I checked all the hoses and couldnt find any obvious leaks. I made a wee mistake with the error code....it was actually "1189-intake channel shut off" but i reckon thats the same thing.........

Stephen

 

[Blakey]

Hi Folks,

Now theres no power all the time. It wont rev above 3000rpm. I had it plugged into a diagnostic computer and the only fault that wouldnt clear was the "Inlet port shutoff motor 1189-016"

If thats the Pierberg unit just before the inlet manifold, it was all gunged up inside. I took it out, cleaned it and, using a syringe, checked that it was working properly.

The car is just the same as before!

Anybody got any ideas????


Stephen

Hello Stephen and welcome to the forum.

The Pierburg unit is the MAF and shouldn't be 'gunged up'.

To diagnose if it has failed completely, try to run the car with it unplugged. If there is no difference, then replace it.

Then to diagnose the cause of the gunge. - It sounds like there may be an EGR fault. There is a motor that closes the valve which recirculates exhaust gas back through the inlet at low throttle levels. If this has failed open it would explain the poor performance and gunging of the MAF.

Good luck and post back your progress.

Chris.

 

[vexed daddy]

Hi Chris,

The MAF (outlet of the filter housing?) is squeaky clean, as are the pipes in and out of the turbo. The gunge really only starts in the valve where the EGR ties in. I might just block the EGR and that would rule that out ....hopefully! There was a little bit of residue upstream of the EGR valve, but it wasnt enough to worry about. Downstream of the valve (into the inlet manifold) is black with a tarry residue. It looks like alot of work to get this out and cleaned, but theres no point doing this until i (a) get the car back to full power and (b) find out why its there in the first place.

The diagnostic doesnt blame the MAF (code 0100 MAF was present, but i put a new one in last year after a power loss, but it cleared and didnt return).

All help/advice is gratefully recieved. Dont wanna be throwing money away buying sensors and valves i dont need!!!!

Stephen

 

[television]

Very few diagnostic test show the MAF to be at fault, as Blakey un plug it and try the car, nothing can happen other that to be better

 

[vexed daddy]

Folks,

I disconnected the MAF and its just the same. Does that mean that's definately the problem or is there anything else it can be?

Stephen

 

[Blakey]

Folks,

I disconnected the MAF and its just the same. Does that mean that's definately the problem or is there anything else it can be?

Stephen

Can't ever be 100 % sure, but it's a relatively cheap part, - I think I paid about £70-80 for my last one at Euro Car Parts. I think you have another problem causing oil fouling.

Perhaps others can help here with possible causes. - Malcolm, any ideas?

Chris.

 

[John Kerr]

I had the same problem on my 220CDI,after trying all sort of things it turned out to be the vaccum actuator for the turbo.Worth a try if nothing else,easy to test.

 

[vexed daddy]

Hi,

John...the actuator...i took off the filter housing so i could see the turbo, and when you start the car, the actuator moves down....so does that mean its working ok?

Blakey...I've ordered a MAF in the hope that this is what the problem is! Its from the local motor factors for £65 inc VAT.

Once i get the car back to full power, i plan to investigate the tarry crap built up in the inlet manifold....it looks like alot of stripping to get the manifold off, but it'll be worth it if i get the car running 100%!!!


Stephen

 

[Xtractorfan]

The inport motor does give problems on this engine.. if you check under the manifold when someone revs the car you should see a bar link to each port, it should move back and forward as the engine is revved..

 

[vexed daddy]

Hi Xtractorfan,

I've been looking and i cant for the life of me see it!!!

Is it part of the EGR system?

Is it is, i think i'll disconnect and plug the vacuum line to the EGR valve. Hopefully this will rule out the EGR as causing the problem!


Stephen

 

[kev]

my car is running at 3000 revs. where can I find the egr valve

 

[television]

Hi Kev and welcome, a little more info please

 

[kev]

running at 300 revs

My c220 cdi will not rev over 3000 revs. Reading other replies i take it that the ERG valve is at fault. I tried a new airflow meter but no better.

 

[Blakey]

Hi Xtractorfan,

I've been looking and i cant for the life of me see it!!!

Is it part of the EGR system?

Is it is, i think i'll disconnect and plug the vacuum line to the EGR valve. Hopefully this will rule out the EGR as causing the problem!


Stephen

If you disconnect the vac line you will get a low vacuum boost pressure fault and definitely go into limp home mode. Might be worth checking if you have a vac leak anyway. Check the unions of the vac lines in case they are split or perished.

 

[twistedsanity]

whatt happens when you try to rev it above 3k?, will it rev above 3k in neutral ?

 

[vexed daddy]

Hi Folks,

I have just stripped around and removed the inlet manifold (not completely cos a loom runs through it and its looks like a nightmare to disconnect it!!!).

The linkage on the inport motor looks like its worn and come loose. All the butterfly valves are moving ok.

Is there a way to check if this servo is operating correctly? I can probably order the linkage separately, but would like to know if the servo is working before i (try) to put it all back together!

Has anyone any ideas how the inside of the manifold could get all tarry/oily? The hoses out of the turbo look clear and it wasnt burning oil, the pipe into the EGR valve looks sooty and dry, just as you'd expect it to!

Would it be possible that this is 150,000 miles worth of exhaust gasses cooling when hit with the cold air?....i cant see anywhere else its coming from!


Stephen

 

[Jimmyboy]

Poor performance on C220 CDI

Hello,
I've come into this conversation because I am also getting poor performance and what seems like going into limp mode on my C220 diesel. I have changed the MAF to no effect after the Merc dealer said it was breaking down. The max rev voltage was in fact low. New Pierburg unit made no difference. I am interested in what has been said about the intake motor. I did not know of this and would like to check it. Also, the turbo bypass valve, vacuum operated, moves freely by hand but could anyone tell me - in the rest state (no vacuum) is the valve in the 'by-pass' or 'turbo' state? My intention next is to have the cat checked for blockage (the car has done 111k miles) and the common rail fuel pressure checked. Has anyone thought of this? I have never seen the ECU fault light come on. I may have to go and see JIB with his STAR diagnostics.

 

[Blakey]

Best get the Diags done first Jimmy, could save some unnecessary expense.

Chris.