Low compression Cylinder 2, please advise - MINI Cooper Forum

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post #1 of 11 (permalink) Old Feb 17th, 2017, 05:04 PM Thread Starter
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Low compression Cylinder 2, please advise

Hi all,

Ive just taken my 2001 Mini Cooper for an MOT which it has failed due to
a Lambda Fast Idle test score of 1.24.

The garage has then run an engine compression test which shows that
cylinder 2 has low compression which they say indicates an internal
engine problem.

The value of the car is around 1500 (it is 17 years old with 105,000 miles
traveled).

The garage say that doing an internal engine inspection to try and find the fault
would involve removing the engine head and so labour costs could quite
quickly approach 1000 so I am really unsure about what to do to resolve this.

Does anyone have any thoughts/advice or has been in a similar situation?

Thanks in advance,

Mark

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post #2 of 11 (permalink) Old Feb 17th, 2017, 09:21 PM
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Is the garage a Mini specialist and use BMW/Mini specific code readers ?
If they did a compression test, one would presume they have removed the error codes this creates.
What was the sensor error code given by the test equipment ? a Lambda Fast Idle test score of 1.24 isn't very helpful as it could be a major issue or a minor issue causing problems (hence the need for the ECU Error code).

I don't know what you pay for cars in the UK but if its been a solid car up to date, you have the time and money and capability, why not get it fixed, its a 2001 Cooper and there wont be that many around and more going to the scrap yard every year. I wish to heck I had held onto my Morris 850 many many years ago as it would be worth a mint today in a full restored condition.

My R50 was built in 2001 but considered a 2002 Cooper, It lets me know its around and gives me grief from time to time but until circumstances dictate, I wont be getting rid of it any time soon or in the foreseeable future. I can honestly say, I can never decide between my R50 and R53, both have thier quirks but the R50 is still putting a smile on my face.

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post #3 of 11 (permalink) Old Feb 17th, 2017, 09:45 PM
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Lambda sensors are only good for 100,000 miles anyway according to MINI. I've already swapped out both of mine at 89,000 miles so I'd be changing the lambda's first and giving it a new set of plugs along with a service and taking it to another MOT station
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post #4 of 11 (permalink) Old Feb 18th, 2017, 09:18 AM Thread Starter
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Hello Sean,

Thank you for your reply. However, from what I understand, the Lamda test is performed at the MOT testing areas end, this is
where the Lambda reading comes from (their Emissions test rig), not my own Lambda sensors.
But yes I agree, the new set of plugs and service could be well worth a try and then try testing again.

Best,

Mark
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post #5 of 11 (permalink) Old Feb 18th, 2017, 09:23 AM Thread Starter
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Hi Milpol,

Thank you for your reply.

No, it is just a general garage that performs MOT's, not a BMW specialist.
So should they be using specific BMW readers?

They didn't tell me the error code, but I can call them again and ask.
If I get the ECU error code, I will post it in here and hopefully that
can throw more light on whether it is a major or minor issue.

Best,

Mark
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post #6 of 11 (permalink) Old Feb 18th, 2017, 01:32 PM
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Hi Mark,

If you can buy your own reader then you can eliminate the middleman!

Look at this on eBay http://www.ebay.co.uk/itm/172518200893

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post #7 of 11 (permalink) Old Feb 18th, 2017, 03:50 PM Thread Starter
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Okay thank you for this Sean.

Another tip someone gave me is to try is to use a can of Wynns Super Charge Oil Treatment
straight into my oil tank which can apparently restore cylinder compression.

Has anyone heard of or tried this with any success?

Cheers,

Mark
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post #8 of 11 (permalink) Old Feb 18th, 2017, 04:44 PM
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I haven't heard of this treatment Mark but a car should always be presented for an MOT in a pre serviced condition, well thats what I tend to do and if the car doesn't get used often I make sure the cat gets nice and hot beforehand!
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post #9 of 11 (permalink) Old Feb 18th, 2017, 05:12 PM
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I tried wynns stop smoke mine ti try make it more bearable did n to do a thing .

I guess with all these mechanic in a can treatments sometimes your lucky sometimes not.
But end of day they only cover up the problem they don't fit it. Best to get it sorted hence why im fitting another engine
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post #10 of 11 (permalink) Old Feb 18th, 2017, 10:26 PM
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Hi Mark, Sean and I use the same code reader and its a very good bit of kit and will serve you well and save you money from dealerships or indys using generic equipment that give incorrect codes.
Always handy to have it. In regards to wynns products, don't waste your money but rather, sort the actual problem instead of masking over it. In the long run, sorting it will be the cheaper option and best option.

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post #11 of 11 (permalink) Old Feb 18th, 2017, 10:27 PM
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Quote:
Originally Posted by Sasquatchuk View Post
I tried wynns stop smoke mine ti try make it more bearable did n to do a thing .

I guess with all these mechanic in a can treatments sometimes your lucky sometimes not.
But end of day they only cover up the problem they don't fit it. Best to get it sorted hence why im fitting another engine
Make sure you keep us posted and pics ! and good luck
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