R53 idling fluctuations at stand still

21112 Views 43 Replies 19 Participants Last post by casper911ca, 13 d ago

R53MINICOOPER

Discussion Starter · Mar 22, 2016

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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TsiliR53

· #21 · Apr 11, 2018

Wouldn’t a vacuum leak be consistent? This is intermittent and is in sync with when the breather is activated.

Planning on lifting the mini tonight (it’s 7:30am here in Darwin, Australia) to get a look at the vapour canister and hose between.

Great to get interest straight away!

Will keep people posted.

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Astroboy

· #22 · Apr 12, 2018

It's not a fault, it's fumes from the tank being released into the intake by the evap solenoid. The warmer the weather, the more frequent it'll be

Reactions: 1

TsiliR53

· #23 · Apr 12, 2018

And I’m in Darwin, 35 degrees C at 85% humidity.

I removed the rear drivers side wheel and arch to inspect the vapor canister - from what I can see;

- no damage or blocked hoses
- canister is dry and not blocked
- definite signs of fuel spills in the past but all dry dust now.

I ran the car with the canister disconnected - breather kicked in and I could feel the suction at the canister end of the hose. Plugged it briefly and not leak could be found... I connected the breather but removed the fuel line and the suction through the canister was there, seemed fine...

Might be worth a new vapour canister since signs of fuel spillage exists but still unsure of the idle surge... is it a MAP issue when the vapor enters the intake?

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Astroboy

· #24 · Apr 12, 2018

Pretty much, and of course the vapours are flammable. If the system was compromised itd throw a fault code

Brompty

· #25 · Apr 12, 2018

I would still check the air hose to the throttle body. Take it off for complete inspection.

minimat

· #26 · Apr 12, 2018

Mine has always done this if I drive it hard then sit in traffic for ages. It's very common.

TsiliR53

· #27 · Apr 13, 2018

Brompty said:
I would still check the air hose to the throttle body. Take it off for complete inspection.

Sure - I’ve done this many times, a clean even. Might be worth a new rubber seal this time too.

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Lopes3d

· #28 · Aug 25, 2018

I’ve just started having the same issue, has anyone come across a cure for it?

frickinben

· #29 · Aug 26, 2018

Checked the front map sensor?

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Lopes3d

· #30 · Aug 26, 2018

Not yet I’m going to try that first see if it stops the chugging

Emin-j

· #31 · Aug 26, 2018

My r53 does the same, sounds and feels like it’s going to stall, a blip on the gas pedal usually clears it.

Lopes3d

· #32 · Aug 26, 2018

Exact same as mine seems to be only for a few seconds but I’d rather it not sound like that &#55357;&#56834;

Emin-j

· #33 · Aug 26, 2018

Lopes3d said:
Exact same as mine seems to be only for a few seconds but I’d rather it not sound like that ��

That’ll be the least of your problems with a r53 :laugh:

frickinben

· #34 · Aug 26, 2018

Lopes3d said:
Not yet I’m going to try that first see if it stops the chugging

They're a cheap fix, I always changed mine when bought I new MINI as they're known for going out at random times.

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Lopes3d

· #35 · Aug 27, 2018

Just had a quick look about there seems to be a “t map sensor” or a “map sensor”. I’m assuming it would just be a map sensor, or did you replace both?

DRP

· #36 · Apr 1, 2019 (Edited)

EDIT - Ignore

tcbw

· #37 · Apr 1, 2019

I thought that they all did this...

Astroboy

· #38 · Apr 1, 2019

tcbw said:
I thought that they all did this...

Random idle dips due to the evap purge solenoid releasing fuel tank vapours into the intake? Yep

Reactions: 1

Micke

· #39 · Apr 1, 2019

Mine doesn't do it anymore after I stopped filling the tank up to the top. Someone suggested that in another thread. Sounded silly but after filling couple of times until the first "click", idle problem is gone :confused1:

tcbw

· #40 · Apr 1, 2019

I'll try that.

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