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Slow return to idle

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Old Feb 25th, 2014, 19:45   #21
slimeslab
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Yes done that.

Are not a great deal like my readings - my 0mm position is open circuit and my final 100mm position is about 350 ohms.

There is a sudden drop in resistance in the last 20mm of movement
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Old Feb 26th, 2014, 12:44   #22
Chris_Rogers
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I'd suggest you have the wrong sensor, that sounds like one for the earlier MSA15.7 system. What's the part No. of the one you've fitted?

You can look up the correct part No. in VADIS if you put your VIN in, the part is listed under the gearbox section.
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Old Feb 26th, 2014, 15:28   #23
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Will try and get the vid up for you later, my computer isn't playing ball.

Mine (15.7) doesn't make any odds in neutral when returning to idle with either/both brake and clutch pedal touched.

It has a rock solid idle that doesn't judder at all, its probably the only diesel car I've ever driven that doesn't, most of them stutter at some stage, esp the newer VAG 4 cylinder diesels
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Old Feb 26th, 2014, 19:18   #24
martin_r_smith
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Quote:
Originally Posted by brickman View Post
Will try and get the vid up for you later, my computer isn't playing ball.

Mine (15.7) doesn't make any odds in neutral when returning to idle with either/both brake and clutch pedal touched.

It has a rock solid idle that doesn't judder at all, its probably the only diesel car I've ever driven that doesn't, most of them stutter at some stage, esp the newer VAG 4 cylinder diesels
Haha very true, mine stutters now just below 1000 rpm before it settles on idle then its fine! I will get to the bottom of it one day but my guess is crank/rpm sensor.
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Old Feb 26th, 2014, 19:56   #25
slimeslab
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I'm pretty sure it's the right part number.
I checked it it vida before ordering and FRF checked too.
I have fitted part no 9472979.

Weird one isn't it!
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Old Feb 27th, 2014, 16:52   #26
Chris_Rogers
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Quote:
Originally Posted by slimeslab View Post
I'm pretty sure it's the right part number.
I checked it it vida before ordering and FRF checked too.
I have fitted part no 9472979.

Weird one isn't it!
Part No. checks OK with what I found, but it seems it does not meet the published spec figures.

As you say weird, or maybe the sensor is faulty.
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Old Jul 6th, 2014, 23:33   #27
AUTOGRAFICA
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I have had the same problem for some months. I have a manual 1998 V70 petrol 2.4 with less than 100,00 on the clock. Its had couple of bits replaced, can't recall exactly what they were as i don't do my own repairs any more, but nothing so far has worked.

I know the fuel filter has been replaced (not that i thought it was that!) and a sensor that fits sits below the top of the rad, plus another alloy thingy with tubes going into it (as you can see i am well into this mechanical stuff!).

Anyhow, nothing so far has worked and my mechanic has drawn a blank so far.

It ticks over fine, still does 33 to the gallon, but the revs are just so slow to come down once warmed up. My guess is it must be a sensor, but these cars have so many today its hard to know where to start. Garry
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Old Aug 18th, 2014, 08:50   #28
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Thought I'd post an update on this...

Problem is still there and every so often I think...I must get that sorted. But the car is still ok and gets around 40-45mpg so alls good in that respect.

I've been thinking about what the real problem could be though. And I recently found out this car has a dual mass flywheel listed in vida.

If this was breaking down and failing could this be the source of my issue.
Other linked issues like feeling pulses through the clutch pedal and ticking noises (the noises I always out down to the vac pump) but now I'm not too sure.

Has anyone has a dmf go bad on one of these tdis?
It's done around 160k and I had no history when I bought it so I don't know if it's ever been done...

Thanks.

Martyn.
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Old Aug 18th, 2014, 19:54   #29
martin_r_smith
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My dmf has just over 200k on it and I ask a lot more of it than most.

Your return to idle could be many sensors really, as I've mentioned before probably crank position sensor. But it could also be a slightly sticky injector.
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Old Aug 18th, 2014, 20:16   #30
Rossey
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I have the same issue
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