94 e220 two cylinders down when warm
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Newbie
Joined: Oct 2009
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1994 w124 e220 7 seater
94 e220 two cylinders down when warm
Hi everyone,
I have a on-going mystery problem which doesn't appear to have been solved in any other forum.
I have a w124 1994 E220 7 seater, engine type m111.960 (HFM Sequential MultiPort Fuel injection System). The ECU on it is a VDO unit, merc number 016 545 96 32, current replacement Bosch part number 016 545 55 32.
Basically, what is happening is that once the engine is fully warmed up, the ECU shuts down fuel and spark to cylinders 1 and 4. So far, I have eliminated plugs, coils, harness, crankshaft position sensor, HT leads and Lamda sensor.
The problem appears to be purely temperature related because exactly the same problem arises when I am driving the car to operating temperature on the road or simply leave it idling at a standstill, in park, for about ten minutes or so, without even touching the accelerator.
I have read the error codes and I am getting only one error code, 21 which refers to "Ignition output 3 (or ignition coil cylinder 1 and 6)" but I have tried a new coil for cylinders 1/4 and this made no difference and I have checked the harness for open and short circuits.
The ECU specialists on the Isle Of Wight reckoned it was likely to be an ECU failure but I would appreciate knowing if anyone else has hit this problem before I opt for an expensive ECU repair which may not solve the problem.
Thanks:
I have a on-going mystery problem which doesn't appear to have been solved in any other forum.
I have a w124 1994 E220 7 seater, engine type m111.960 (HFM Sequential MultiPort Fuel injection System). The ECU on it is a VDO unit, merc number 016 545 96 32, current replacement Bosch part number 016 545 55 32.
Basically, what is happening is that once the engine is fully warmed up, the ECU shuts down fuel and spark to cylinders 1 and 4. So far, I have eliminated plugs, coils, harness, crankshaft position sensor, HT leads and Lamda sensor.
The problem appears to be purely temperature related because exactly the same problem arises when I am driving the car to operating temperature on the road or simply leave it idling at a standstill, in park, for about ten minutes or so, without even touching the accelerator.
I have read the error codes and I am getting only one error code, 21 which refers to "Ignition output 3 (or ignition coil cylinder 1 and 6)" but I have tried a new coil for cylinders 1/4 and this made no difference and I have checked the harness for open and short circuits.
The ECU specialists on the Isle Of Wight reckoned it was likely to be an ECU failure but I would appreciate knowing if anyone else has hit this problem before I opt for an expensive ECU repair which may not solve the problem.
Thanks:
Newbie
Joined: Mar 2023
Posts: 9
Likes: 4
w124 e220
Hi everyone,
I have a on-going mystery problem which doesn't appear to have been solved in any other forum.
I have a w124 1994 E220 7 seater, engine type m111.960 (HFM Sequential MultiPort Fuel injection System). The ECU on it is a VDO unit, merc number 016 545 96 32, current replacement Bosch part number 016 545 55 32.
Basically, what is happening is that once the engine is fully warmed up, the ECU shuts down fuel and spark to cylinders 1 and 4. So far, I have eliminated plugs, coils, harness, crankshaft position sensor, HT leads and Lamda sensor.
The problem appears to be purely temperature related because exactly the same problem arises when I am driving the car to operating temperature on the road or simply leave it idling at a standstill, in park, for about ten minutes or so, without even touching the accelerator.
I have read the error codes and I am getting only one error code, 21 which refers to "Ignition output 3 (or ignition coil cylinder 1 and 6)" but I have tried a new coil for cylinders 1/4 and this made no difference and I have checked the harness for open and short circuits.
The ECU specialists on the Isle Of Wight reckoned it was likely to be an ECU failure but I would appreciate knowing if anyone else has hit this problem before I opt for an expensive ECU repair which may not solve the problem.
Thanks:
I have a on-going mystery problem which doesn't appear to have been solved in any other forum.
I have a w124 1994 E220 7 seater, engine type m111.960 (HFM Sequential MultiPort Fuel injection System). The ECU on it is a VDO unit, merc number 016 545 96 32, current replacement Bosch part number 016 545 55 32.
Basically, what is happening is that once the engine is fully warmed up, the ECU shuts down fuel and spark to cylinders 1 and 4. So far, I have eliminated plugs, coils, harness, crankshaft position sensor, HT leads and Lamda sensor.
The problem appears to be purely temperature related because exactly the same problem arises when I am driving the car to operating temperature on the road or simply leave it idling at a standstill, in park, for about ten minutes or so, without even touching the accelerator.
I have read the error codes and I am getting only one error code, 21 which refers to "Ignition output 3 (or ignition coil cylinder 1 and 6)" but I have tried a new coil for cylinders 1/4 and this made no difference and I have checked the harness for open and short circuits.
The ECU specialists on the Isle Of Wight reckoned it was likely to be an ECU failure but I would appreciate knowing if anyone else has hit this problem before I opt for an expensive ECU repair which may not solve the problem.
Thanks:
