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Hesitation At 2.5K Revs When Cold


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#1 Chew

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Posted 07 December 2017 - 08:52 PM

Hi everyone, just a quick issue regarding my mini,

 

The car appears to hesitate upon acceleration (50%+ throttle) when reaching about 2500rpm and hesitates to 'go' , but the issue is sorted when the car reaches operating temperature and revs freely through the range. I can't really find a definitive solution. Just to note, the car is running particularly rich and needs to be sorted, plugs are frequently fouled making start up a bit of a pain. HS4 carb Mini 30, 998 A+. I'd just like to know whether the issue can be sorted or is it something to expect with the car being recently started (Always give about 5 minutes for the car to warm up when cold before setting off).

 

Cheers.


Edited by Chew, 07 December 2017 - 08:56 PM.


#2 cal844

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Posted 07 December 2017 - 10:56 PM

It sounds like it's too rich, a few questions::

once started do you push the choke in slightly?

Is the dashpot oil correctly filled?

#3 Chew

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Posted 12 December 2017 - 06:26 PM

It sounds like it's too rich, a few questions::

once started do you push the choke in slightly?

Is the dashpot oil correctly filled?

Yeah, depending on where it's sitting (rpm wise) I'll usually push the choke in so it sits at just over 1K revs. Dashpot is filled (I think with 10w40).


Edited by Chew, 12 December 2017 - 06:27 PM.


#4 cal844

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Posted 12 December 2017 - 11:23 PM


It sounds like it's too rich, a few questions::

once started do you push the choke in slightly?

Is the dashpot oil correctly filled?

Yeah, depending on where it's sitting (rpm wise) I'll usually push the choke in so it sits at just over 1K revs. Dashpot is filled (I think with 10w40).


When the car hesitates pull the choke out maybe one inch, does it improve or get worse? If the engine hesitates then pulls like a train, try a 20/50 engine oil... our minis hate anything thinner (or thicker) than 20/50 engine oil all year round. They run well, so, why not try a heavier oil, to see if that's the issue?

#5 dyshipfakta

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Posted Yesterday, 07:12 AM

interestingly mine is ike this if I run 20w50 in the dash pot its deffo an easy and cheap place to start.




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