D
Dave 1966
Guest
Greetings, its a W208 320 CLK, on a W plate, 90k miles.
I have had a miss-fire problem for a while, where one or more cylinders would drop out under hard acceleration. To clear it, you simply turn off the ignition, restart and away you go (this could be done on the move, but not ideal if you're trying to overtake someone...). If the car was used for a long run (100+ miles), it would be a whole lot better, although the fault could be reproduced if you try hard enough. Over a period of time doing short journeys to work (4 miles each way), it would get progressivley worse. When the fault was reproduced, it was proved to be different cylinders that would drop out by removing the leads to the coil packs. I was advised that perhaps the fuel filter could do with a change, complete with the pressure regulating valve inside it.
As a side issue, the battery was on it's last legs and was losing charge.
The fuel filter was changed and the car started to make sure all was ok. It ran ok, and appeared to rev ok.
The battery was then changed. It now runs like a sack of.... It starts on all six, but then almost immediatley drops down onto three. But it will always be a different three. No apparent pattern. Gradually increasing the revs, it will run on all six from about 3000rpm upwards. The fuel lines have been flushed through, as the petrol that came out of the fuel filter was black, just in case.
A contact at Mercedes has now advised changing the plugs, leads and coil packs, but as each coil pack is about £200 (x6), then there are the 12 spark plugs (not cheap), and leads on top, I thought I would seek further advise before blowing a whole pile of cash.
Please please please some one help......
I have had a miss-fire problem for a while, where one or more cylinders would drop out under hard acceleration. To clear it, you simply turn off the ignition, restart and away you go (this could be done on the move, but not ideal if you're trying to overtake someone...). If the car was used for a long run (100+ miles), it would be a whole lot better, although the fault could be reproduced if you try hard enough. Over a period of time doing short journeys to work (4 miles each way), it would get progressivley worse. When the fault was reproduced, it was proved to be different cylinders that would drop out by removing the leads to the coil packs. I was advised that perhaps the fuel filter could do with a change, complete with the pressure regulating valve inside it.
As a side issue, the battery was on it's last legs and was losing charge.
The fuel filter was changed and the car started to make sure all was ok. It ran ok, and appeared to rev ok.
The battery was then changed. It now runs like a sack of.... It starts on all six, but then almost immediatley drops down onto three. But it will always be a different three. No apparent pattern. Gradually increasing the revs, it will run on all six from about 3000rpm upwards. The fuel lines have been flushed through, as the petrol that came out of the fuel filter was black, just in case.
A contact at Mercedes has now advised changing the plugs, leads and coil packs, but as each coil pack is about £200 (x6), then there are the 12 spark plugs (not cheap), and leads on top, I thought I would seek further advise before blowing a whole pile of cash.
Please please please some one help......
