14 replies to this topic

[elsie260]

Hi I have a 2001 mini cooper 1300 with a miss fire? Miss fire is intermittent and not always there, but when missfire happens feels like car is going to stall although it dosent! It sometimes back fires through the inlet manifold any suggestions?

Easy we hear you cry -

The car has been to local mini garage no faults found

Changed Plugs? Done no difference
Coil Pack? Done no difference
Crank senor? Done no difference
Temperature sensor? Done no difference
Cam sensor? Done no difference
Lamba Sensor? Done no difference
Inspected Cat? Done no difference
Extra earth wire from body to engine? Done no difference
ECU Checked? Done no Faults!
Compression Test? All ok
Swapped fuel injectors? Done no difference!

Any sensor we can think of has been replaced with genuine mini part!
If anyone has any suggestions it would be very helpful! Have so far spent a fortune and no further on!
Thanks

[BoyracerAU]

What about your vacuum lines? Have these been checked for leaks?

Note: the lines themselves may be okay, but the little elbows fail too.

[elsie260]

Hi I have a 2001 mini cooper 1300 with a miss fire? Miss fire is intermittent and not always there, but when missfire happens feels like car is going to stall although it dosent! It sometimes back fires through the inlet manifold any suggestions?

Easy we hear you cry -

The car has been to local mini garage no faults found

Changed Plugs? Done no difference
Coil Pack? Done no difference
Crank senor? Done no difference
Temperature sensor? Done no difference
Cam sensor? Done no difference
Lamba Sensor? Done no difference
Inspected Cat? Done no difference
Extra earth wire from body to engine? Done no difference
ECU Checked? Done no Faults!
Compression Test? All ok
Swapped fuel injectors? Done no difference!

Any sensor we can think of has been replaced with genuine mini part!
If anyone has any suggestions it would be very helpful! Have so far spent a fortune and no further on!
Thanks

[elsie260]

What about your vacuum lines? Have these been checked for leaks?

Note: the lines themselves may be okay, but the little elbows fail too.

Hi thanks for the quick response - but these have been checked and all ok????

[Jackman]

Changed Plugs? Done no difference

What plugs you using? A friends had the similar type and it was down to the type of plugs that were used.

[elsie260]

Changed Plugs? Done no difference

What plugs you using? A friends had the similar type and it was down to the type of plugs that were used.

Hi - Denso plugs as per guidance chart? and gap to manufactuers recommendations!

[Jackman]

Are they a resistor type?

[elsie260]

Are they a resistor type?

Hi not sure. what difference would this make? thanks elsie

[Jackman]

None resistor type will overheat the coil (i think that the right away around) causing misfire problems.

If you get the code off the plugs ill check.

[elsie260]

None resistor type will overheat the coil (i think that the right away around) causing misfire problems.

If you get the code off the plugs ill check.

Hi Thanks for that will check although dont think it fits - missfire will happen completly randomly - ie from cold or warm - can be driving and the car will start to missfire complete journey and leave for 15 minutes and then completly fine - or fine from cold when warm starts to missfire or from cold will missfire - only real difference is the fault seems to becoming more permanent? and fault still present with old and new plugs!
Vehicle has only 14,000 miles on clock?????!!!!!!!!
Thanks will check the type though
elsie

[Sprocket]

Fuel pump electrical circuit fault whether its a wiring issue, bad connection on the engine loom to body loom connector or the body loom to rear loom connector, the relay pack or the inertia switch.

When you say miss fire, does it hesitate badly under acceleration?

It would be an idea to go for a drive with a passenger, while the diagnostic is connected, that way you can see wath the ECU is doing when it does it. Then you can narrow down the issue

[miniboy1971]

Have you ever replaced the HT leads...? I was advised to put new ones in every couple of years or so as they degrade.......

[yubyub]

you know what? my mpi is suffering similar symptoms, mine happens when the engine is under strain such as accelerating (though intermittent)...and yes there is slight hesitation when accelerating too.

[MrOz]

I had this problem as well.

A new set of HT leads, new plugs and finally swapped over to a K&N filter and everything is good.

[yubyub]

Unfortunately, this didn't work for me...annoyingly