HI ALL (2)

[v12bitch]

hope some help will come this way........ my 2004 x type 2.0 diesel sometimes and is only sometimes will when on idle seems to almost want to stall and then picks up to about 1200 rpm then settles down all in a matter of say a min.. will do this 3 or 4 times then will be fine for weeks ?? had it on a diagnostic but nothing shows up and of course fault doesnt happen when at the garage lol may be I should post this on the ford forums (mondeo) any ideas thanks all
ps there is no symptoms when driving or throttle no loss power nothing !!

[varsas]

My 328i had exactly the same symptoms, including a lack of fault codes. Turned out to be the camshaft position sensor. Only got to the bottom of it by hooking it up to a laptop and driving it round until it did it and then reading the log of all the sensors. Was the car on a proper ODB2 reader or just a fault code checker? If you have no EML (or whatever Jaguar call that) light on a simple fault code checker will tell you nothing.

What happens to the rev counter and speedo when this happens?

I'd say probable suspects are:

Cam sensor.
Crank sensor.
Coil pack.
MAF (probably wouldn't throw an error if it's just reading back to 0).
Electrical short.

Edited by varsas on Saturday 25th February 19:09

[v12bitch]

only happens when stationary and at idle rev counter drops and rises as the engine dips and rises and looks and sounds accurate nothing moves on the speedo thanks for the views

[varsas]

v12bh said:

only happens when stationary and at idle rev counter drops and rises as the engine dips and rises and looks and sounds accurate nothing moves on the speedo thanks for the views

oohhh..right. well on a petrol car I'd say to clean out the IAC (idle air control) valve. I assume diesel cars have something similar? Also check the MAF (mass air flow) sensor and the EGR (Exhaust gas recirculation) valve. All simple and free things to check before you get into messing about with sensors and stuff. As I say though, if you sit in the car with a laptop logging the sensors you should be able to see very easily what's causing it.

Just seen this:

http://www.justanswer.com/uk-car/1kz86-asked-quest...

might be helpful?

Edited by varsas on Saturday 25th February 21:06

[v12bitch]

all helpfull will look sunday if dry day lol