shedinagarden
New Member
Hello All,
I am turning to you all in a now desperate attempt to get my w124 E200 (M111 engine, 4 speed auto box) estate running properly after many failed attempts and foxed mechanics.
While this may at first seem like a normal M111 idling problem, I can’t find anything else quite like it on here, and I am actually worried I have two problems.
I think the best way to explain the problem is to talk you through an average day with my car:
1) Cold start – engine fires easily, and then cuts out immediately unless throttle applied. The engine will cut out again when the throttle is released until the engine starts to warm up (normally around 2 minutes), when it will settle in to a smooth idle. HOWEVER, more recently, when the engine is revved as required to keep it running, it feels like it is misfiring and the whole car shakes. This is accompanied by a very strong smell of fuel. When the throttle is released, the revs stick at 2000rpm, until Drive is engaged when they drop back to below 1000 and the car idles much more smoothly.
2) First period of driving in a day – if steering lock is needed to pull away, the engine will struggle more so than normal, and the engine may cut out, requiring a shorter repeat of 1. Then, if the engine did the misfire-like thing when started, the throttle will stick open regularly, usually at either 1500 or 2000rpm. When the throttle sticks open, it normally does so for a period of 7-10 seconds. No exaggeration, I’ve counted! After this time, the throttle responds normally until the next time the car goes over 1500 or 2000 rpm. The revs will also cut out when you use the brakes to “fight against” the revving engine before the 7-10 seconds.
3) Second use - engine still a little warm – will start and idle usually normally, but in driving the revs remain high when throttle released and the car surges on.
4) Third use – Engine still warm – car will start and drive normally (usually, but not all the time!)
The following parts have already been replaced: throttle body (with a used part) and a new ignition barrel. Also, having looked at the throttle cable, that is releasing properly, but the revs will remain high when the car does has one of it’s sticky throttle moments.
It has been suggested that electrical feeds to a volatile memory (presumably this is in the control unit), which stores the fuel mixture data should be checked. Other suggestions have included a faulty MAF meter (how do I check my car is fitted with one of these?).
Can anyone suggest what to focus on, if they are sure they know what the problem could be, or if you can certainly say it would not be any of the other things I have been told it can be.
Any help is gratefully received, so I can give a mechanic a list of things to check before I end up wasting any more money on parts that the car doesn’t require!
Many thanks in anticipation,
Craig
I am turning to you all in a now desperate attempt to get my w124 E200 (M111 engine, 4 speed auto box) estate running properly after many failed attempts and foxed mechanics.
While this may at first seem like a normal M111 idling problem, I can’t find anything else quite like it on here, and I am actually worried I have two problems.
I think the best way to explain the problem is to talk you through an average day with my car:
1) Cold start – engine fires easily, and then cuts out immediately unless throttle applied. The engine will cut out again when the throttle is released until the engine starts to warm up (normally around 2 minutes), when it will settle in to a smooth idle. HOWEVER, more recently, when the engine is revved as required to keep it running, it feels like it is misfiring and the whole car shakes. This is accompanied by a very strong smell of fuel. When the throttle is released, the revs stick at 2000rpm, until Drive is engaged when they drop back to below 1000 and the car idles much more smoothly.
2) First period of driving in a day – if steering lock is needed to pull away, the engine will struggle more so than normal, and the engine may cut out, requiring a shorter repeat of 1. Then, if the engine did the misfire-like thing when started, the throttle will stick open regularly, usually at either 1500 or 2000rpm. When the throttle sticks open, it normally does so for a period of 7-10 seconds. No exaggeration, I’ve counted! After this time, the throttle responds normally until the next time the car goes over 1500 or 2000 rpm. The revs will also cut out when you use the brakes to “fight against” the revving engine before the 7-10 seconds.
3) Second use - engine still a little warm – will start and idle usually normally, but in driving the revs remain high when throttle released and the car surges on.
4) Third use – Engine still warm – car will start and drive normally (usually, but not all the time!)
The following parts have already been replaced: throttle body (with a used part) and a new ignition barrel. Also, having looked at the throttle cable, that is releasing properly, but the revs will remain high when the car does has one of it’s sticky throttle moments.
It has been suggested that electrical feeds to a volatile memory (presumably this is in the control unit), which stores the fuel mixture data should be checked. Other suggestions have included a faulty MAF meter (how do I check my car is fitted with one of these?).
Can anyone suggest what to focus on, if they are sure they know what the problem could be, or if you can certainly say it would not be any of the other things I have been told it can be.
Any help is gratefully received, so I can give a mechanic a list of things to check before I end up wasting any more money on parts that the car doesn’t require!
Many thanks in anticipation,
Craig
