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Old 05-17-2011, 07:59 AM   #1 (permalink)
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2002 E39 Idle Control Issue

Need some help to diagnose idle issue please - after driving for few miles and then stopping for 10-15 minutes (engine off), then restarting car, the idle becomes irratic and cuts out when opening the throttle. Leave it for few minutes (try ignition a few times) and then all OK.

Have taken it to garage and they *think* it may be idle control valve that needs replacing but not guaranteed.

I just need to check if there is anything else that may be causing the symptoms - it only happens when car is warmed up (10 mile journey) and then switched off for few minutes. (Works fine from cold engine).

Any comments appreciated.
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Old 05-17-2011, 02:23 PM   #2 (permalink)
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Another cause could be that the throttle body itself may need a clean... Take it off (Not a hard job), get a toothbrush dowsed in petrol or thinners and scrub it out !!!
Still could be the ICV though, but try the throttle body anyway as an idea !!

If I'm wrong, consider the cam and throttle position sensors, they may also need a wipe as they CAN get gunged up...
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Old 05-18-2011, 04:56 AM   #3 (permalink)
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Thanks for the advice Daz.

The garage have done what you suggest about cleaning throttle body. Same issue however.

The RAC man also said it's most likely the ICV - the car is due to go to garage on Friday to get this replaced (120 for the ICV), hoping it gets fixed.

RAC man also commented this was a comon problem with E39s and Jaguars.

Cheers
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Old 05-18-2011, 01:59 PM   #4 (permalink)
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That's right as Jag's have the BMW units too now !!
Having said that... The garage should test a known good ICV before making you shell-out your cash...
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Old 05-25-2011, 04:32 AM   #5 (permalink)
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Garage replaced the ICV with new one (180 job!!) but still same issue.

Friend of mine is helping, helped clean out the MAF with carb cleaner, but whilst on the job, noticed the vaccum inside the cranck case was extreme. Such in fact that it was hard to get the oil cap off there was so much vaccumm and when the dipstick was removed a huge rush of air entered the pipe.


Any related thoughts appreciated, the idle issue remains

Thanks
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Old 05-25-2011, 01:25 PM   #6 (permalink)
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Now thats a different issue...
It's obvious that the oil pump is working ok but as its pumping oil up thru the engine, it's not getting back down easy enough... Hence the vacuum !
Could be a gunged up pipe, oil pick-up strainer or general blockage in the rocker...
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