Bit of a strange one here...
My S50 was generally running fine. About a year ago I started having a really funny idle after full throttle right through the rev range - effectively the idle would rise 1500 - 2500 revs and then back down again, and when trying to drive the car and pressing the throttle there would be a sudden urge forward. Eventually this would clear and the car would be running fine again. I checked the codes and only had injector 4 fault (Which wouldn't ordinarily result in a bad idle!)
Anyway I put up with it as it was intermittent. After my last run out it's turned out to be a permanent feature from cold start. I took it to my very good ex BMW mechanic and a vanos specialist was also there - both were a bit puzzled. They looked at the codes, pulled the MAF, TPS and Camshaft sensor. They activated the ICV and disabled injectors from diagnostics. Their only conclusion was wiring perhaps.
Over the years I have done the following:
This evening I swapped injector 1 and 4 to see if the fault moved - it didn't. I noticed that injectors 1 and 4 had been marked previously aand swapped. I then looked in the folder and found there was an injector fault on 4 in 2014 and the fault couldn't be diagnosed properly
Has anyone seen this before? The only 2 things I'm thinking now is either the wiring loom or the DME
Thoughts welcomed!
My S50 was generally running fine. About a year ago I started having a really funny idle after full throttle right through the rev range - effectively the idle would rise 1500 - 2500 revs and then back down again, and when trying to drive the car and pressing the throttle there would be a sudden urge forward. Eventually this would clear and the car would be running fine again. I checked the codes and only had injector 4 fault (Which wouldn't ordinarily result in a bad idle!)
Anyway I put up with it as it was intermittent. After my last run out it's turned out to be a permanent feature from cold start. I took it to my very good ex BMW mechanic and a vanos specialist was also there - both were a bit puzzled. They looked at the codes, pulled the MAF, TPS and Camshaft sensor. They activated the ICV and disabled injectors from diagnostics. Their only conclusion was wiring perhaps.
Over the years I have done the following:
- Inspection II
- Replaced vacuum pipes
- Cleaned out the ICV
- Replaced TPS
- plus many other things I probably can't remember!
This evening I swapped injector 1 and 4 to see if the fault moved - it didn't. I noticed that injectors 1 and 4 had been marked previously aand swapped. I then looked in the folder and found there was an injector fault on 4 in 2014 and the fault couldn't be diagnosed properly
Has anyone seen this before? The only 2 things I'm thinking now is either the wiring loom or the DME
Thoughts welcomed!
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