Mercedes Benz C-Class W203 (2000 - 2007) - 20 1.8 misfire when stopping in traffic

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Mon 11 May 2009 23:12
20 1.8 misfire when stopping in traffic - kmc
Can anyone help............... vehicle has 53,000 on the clock and when stopped in traffic or at traffic lights the car misfires and the ECU light comes on. If you turn the car off and back on this stops the misfire until the next red light. Fault code indicates coil pack/injector issues. Always shows fault on number 4. Have moved then all around but still fault always shows on 4
So far have.......

Replaced coil packs 4 times
New set of spark plugs
Wiring checked
No oil around ECU unit
Head removed all injectors cleaned and functioning correctly
Found low compression........... cracked exhaust valve.... replaced... but still misfires
MAF sensor replaced
Oil changed twice

Has anyone out there cured their misfire . Any advice would be a great help
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Tue 12 May 2009 01:20
20 1.8 misfire when stopping in traffic - Dynamic Dave
Year of manufacture = 20?

Can you provide the correct year please and either I or one of the other moderators will edit it in, thanks. DD.
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Tue 12 May 2009 12:21
20 1.8 misfire when stopping in traffic - Number_Cruncher
>>Fault code indicates coil pack/injector issues

That doesn't sound right.

Was the cracked valve in No 4?

As soon as the car does this again, get the comressions checked. Some garages have equipment to allow the compressions to be checked via measurements of the battery current while cranking - making testing for compressions very quick, requiring no dismantling.
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