[jcw-s]

I have 02 cooper s & lately when i accelerate hard it shudders/jumpy feeling almost like there is a block to the power but eventually releases, but driving the other day i pushed it hard & same thing happened but this time the engine light came on but went off after a few hrs of the car been off? Any idea what could be wrong?

Any bit of help is gratefully welcome...

[hoojkel]

It could be the Air bypass valve

[jcw-s]

What is that? Is it a major issue?

[r1_kde]

from you discription it could be a whole world of problems,

* clutch slipping - probably wouldn't put the light on
* bypass not functioning corectly - probably not though
* loose boost pipe somewhere
* problem with throttle
* a good selection of sensors
* belt slipping
* aftermarket pulley slipping
* spark plugs
* Injectors

What you need to obtain is an OBD II CAN reader and read the code you get, I have one and based in the midlands. or take to BMW.

The description you gave could point at way to many items to pin point the problem. is it under fueling? burning all cylinders? any black smoke? we would need a lot more information. best to read your fault code

[MINI-Morgan]

Yeah possible broken bypass valve spring.

Or shot T-map sensor maybe...

[jcw-s]

Cheers lads for the info, will bring it to BMW & see what they say! It happened before but problem went away but just want to get it fixed or sorted now because its a pain in the hole...

[r1_kde]

if you can get hold of an OBDII it will cost a lot less than BMW unless your under warrenty

[k-huevo]

Spark plug wires; if you have more than 30k miles on the vehicle install a new set of OEM wires. Clean the coil posts and apply dielectric grease to the connectors on both ends of the wires. This is an easy, cost effective trouble shooting step, plus prudent preventative maintenance item.

[jcw-s]

Got the car over to local mini dealership, turns out the HT conectors had rusted through (3 of the 4) so having them replaced & hopefully back on the road trouble free tomorrow...

Thanks for all the help!

[k-huevo]

HT is an abbreviation or acronym for?

[Snowie]

Quote: Originally Posted by k-huevo (original)

HT is an abbreviation or acronym for?

High Tension = HT leads are the voltage / current carrier from the Ignition pack (coil in the old days) to the spark plugs

High Tension because uit is High Voltage in these lines

[k-huevo]

So in other words, spark plug wire connector to the coil post?

I’ve seen failed MINI plug wires more than a few times and the generated codes are usually erroneous. I’ve not seen a first gen. MINI yet without oxidation on the #3 coil post terminal; a skilled mechanic is not needed to clean the posts and apply dielectric grease.

[Snowie]

Quote: Originally Posted by k-huevo (original)

So in other words, spark plug wire connector on the coil post?

.

YEP