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Old 30-12-2012, 02:13 PM   #16
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@ dieselman .. well I changed it and drove it and it was EXACTLY the same...so put mine back in as to get my money back.. not 100% sure I suppose

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Old 30-12-2012, 02:19 PM   #17
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@ dieselman .. well I changed it and drove it and it was EXACTLY the same...so put mine back in as to get my money back.. not 100% sure I suppose

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Was it a genuine Bosch MAS or a cheap copy part from a well known supplier.

If the latter it will have been faulty, almost guaranteed. I've known them be even worse then the faulty Bosch one taken out.


To test the MAS, meter Pin-5 WRT Gnd. Expect ~2vDc at idle rising to ~4.8vDc at full revs.
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Old 30-12-2012, 02:31 PM   #18
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Second hand Bosch part from a decent over the counter breakers..

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Old 30-12-2012, 02:43 PM   #19
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Fuel relay (behind battery*
It does have a fuel starved feeling to it in fairness..

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Old 31-12-2012, 10:44 AM   #20
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It does have a fuel starved feeling to it in fairness..

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If your problem is a fuel starved problem the car would run worse with full throttle but If I understand you correctly the car idle is good and the acceleration is also good but the problem is when you hold the same speed on the highway. I guess your engine is a M111.960 and you have change the throttle body so If I am correct the throttle position sensor is built in the throttle housing so we can rule out this part too.


I guess you have two coils sitting on top of sparks plug they have a rubber boot that gets dry and tend to crack try to change them not expensive and a good maintenance you need to do anyway. This engine also got problem with the engine wire harness try to move the wires (could possible damage the ECU) and see if you can get some sort of problem or check the wire buy cutting the isolation.




And you need to be sure your replacement MAS air flow sensor is a good one.

Could also be a fuel pump problem but If that's the problem you soon will notice when the car stops running.
Could it be a cam sensor problem I am not sure but look in to it.
Strange problem if you go uphill is the engine running worse?
If I would take a guess I would say engine wiring harness.
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Old 31-12-2012, 12:19 PM   #21
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on these engines it's the lead that goes to the MAF (across back of engine) that gets burnt over time.

You need to check the continuity of each wire from the MAF plug back to the ECU plug - they will likley have shorted to each other.

Have you done diesel man's test yet ?

the rubber extenders down to the plugs can go faulty too.

a simple 'blip light' test of the fault codes will reveal which cylinder is not firing properly in that case.

Try find Indie familiar with you generation of car.
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Old 31-12-2012, 02:47 PM   #22
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OK I found the a culprit..
While feeling around to see if any vacuum hoses were unplugged I pushed in the throttle body cable a tiny bit more and hey presto.. sorted.
The clips are broken to keep it tight so with a jublee clip and a prayer it should stay there...
Thanks to you all for your replies.. great site.
And I learned a bit more about my engine . Cheers , Chris

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Old 31-12-2012, 02:53 PM   #23
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Glad you are sorted and another 124 survives. Happy Motoring in 2013.
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Old 31-12-2012, 03:00 PM   #24
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Happy new year to you all... :-)

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