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Discussion Starter #1
My R53 has developed a new gremlin.

The past month or so Iv noticed when the car idles at stand still for more than 5 minutes or so the revs start fluctuating on the verge of cutting out and then picks itself back up again and down /up etc Temperature gauge is always at half when it's at temperature and the fan is working ( even though Iv only heard it once with the air temp still being pretty cold ) if I rev the car it settles back to normal . It's almost like the car Is running out of fuel . Its had a recent full service including fuel filter .

There's no issues when the car is driving it just seems to be at idle for anytime over 5/10mins waiting for work with the heaters on mainly . I'm abit concerned as its intermittent but probably happening more often in the same situations and I really need it reliable .

Any ideas ?
 

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2006 R53
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2006 R53
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I wouldn't be too concerned about it, mine has done it for the last three years. Chances are the solenoid is fine but the charcoal filter has reached the end of it's useful life
here's a link to the part numbers, the filter is part 20
RealOEM.com - Online BMW Parts Catalog
it could be something else but i doubt it
 

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Discussion Starter #7
As long as if that's the problem it doesn't get me stranded somewhere . might just stuff it full of the charcoal from a fish tank filter at that price though . �� Joke / partly , thanks again for pointing this out . The car has 85k so prob is done .
 

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Same issue with mine, can be quite alarming when it happens!
Scanned it and had a pending fault of post cat lambda sensor, but that was just effect not cause as the readings were alright for the sensor.
Like Astroboy I live with it.

Sent from my GT-I9195 using Tapatalk
 

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Well I learnt something new today. Didn't even know these systems existed...
 

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Well that's me learnt something new I've been scratching my head about this for awhile thinking of all mad theorys. Fuel filter needs doing thought bit thanks

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As long as if that's the problem it doesn't get me stranded somewhere . might just stuff it full of the charcoal from a fish tank filter at that price though . ? Joke / partly , thanks again for pointing this out . The car has 85k so prob is done .
The charcoal petrol canister is considered a life time part. I have 217K miles on mine, no issues. Problems with this part usually happen due to improper filling of the gas tank. Never "top off" the petrol in the tank of your MINI......What happens is that topped off petrol can back fill into canister. It not supposed to do that.

When pump shuts off stop pumping it. This goes for 2nd gen MINI as well.

GL!
 

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2006 R53
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Nearly forgot to add. It's not the introduction of vapour that causes the chugging, it's when the solenoid closes and the ecu compensates (as best it can using the reading from the o2 sensor) to the new 'lean' condition
 

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Nearly forgot to add. It's not the introduction of vapour that causes the chugging, it's when the solenoid closes and the ecu compensates (as best it can using the reading from the o2 sensor) to the new 'lean' condition
From the link you posted earlier: "A faulty purge valve that stays open all the time can effectively cause a vacuum leak."

Vacuum leaks usually cause problems at idle..? And temporarily keeping the valve effectively shut by plugging the hose should kill that leak.
 

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2006 R53
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Yes you're right but they rarely fail. if I get a chance I'll do a quick video of my wideband gauge when it chugs. I know there are no issues with my solenoid
 

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An old discussing I’d like to open back up.

The odd idle surge, I’m dealing with it now - ran the ista+ test to confirm the purge valve is activating and it’s good. Do a live test - let the car run and disconnect the top hose to the purge valve - there’s a lot of suck but no affect on idle, reattach and disconnect the lower hose - the valve will suck on your finger just fine. Idle is perfect.

Next step is to visit the charcoal filter - anyone got a photo of where it is mounted? I’ll blow air from the canister to the purge valve (disconnected of course) to clear the line - check for hose damage whilst there.

A replacement canister is $300 here in Oz from mini - $160 on eBay new, $60 on eBay used.

Anyone had an experience here?




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Have you checked all the hoses - the symptoms are also similar to vacuum leak. Mine did this a while ago, and it was the air intake hose that was perished.
 
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