1996 Rover Mini question

murphyv310 · 13th February 2019, 20:01

Hi.
A non 75 question that could help out a friend.

My friend has had this "P" reg Mini for a good few years. It has a very intermittent misfire, all the usual things have been tried over the years and TBH many things have been replaced umpteen times.

It is the fuel injected version and as far as I know it has not had a T4 session or even if it can be T4'd

He is prepared to travel to get a diagnoses, can anyone here help, if so I'll pass on the info.
Many thanks.

sworks · 13th February 2019, 20:53

It can be T4’d using the blue lead. Being 1996 it will be an MPI. Misfire could be anything from plugs to leads to the coil pack. Plenty of mini specialists out there so shouldn’t be too hard to sort.

minimutly · 13th February 2019, 20:59

Things you can do yourself - well he could anyway!
Check for water in the fuel tank - more common than you think. By removing and tipping out the contents of the fuel filter, running the pump into a bottle etc.
Remove and hang the ecu up with the vacuum line facing down, preferably somewhere warm. Fuel has been known to condense in the vac sensor in the ecu.
Put a dvm on the wiper of the throttle pot to measure the voltage as the throttle is slowly opened - it should sweep gradually upwards to 5? Volts from memory, no jumping about, just gradual change.
Have a look at the pins on the big plug on the ecu for greening.
Can't think of anything else.

murphyv310 · 14th February 2019, 09:20

Hi.
Thanks everyone.

A bit more info...... The car is an MPI with twin injectors and doesn't have the vacuum sensor, perhaps that may be a clue or change the goalposts!!

Ravinder · 14th February 2019, 10:07

Trevor, ikmsure paul (mininuts) will post soon. He knows his minis well.

Bogbrush82 · 14th February 2019, 12:55

Has he considered a leak back test to check the condition of his injectors?

Discofan · 14th February 2019, 19:19

If you check out "The Mini Forum" they have a dedicated technical section for the later fuel injected classic Minis, loads of info and assistance on there.

mininuts · 14th February 2019, 22:06

Hi Trevor
Like said, could be a host of things alongside the obvious things

One thing worth checking is the coil pack. I had a similar issue on my MPI Mini when I bought it, turned out to be a hairline crack in the coil pack which was virtually invisible. Apparently quite a few have failed in this way.
Cost around £50 for a new Lucas one so, not too expensive to try.

Probably not the cause but, also worth checking the fuel filter that is located on the rear subframe of all places

These can be a nightmare to change due to corrosion so, they rarely get looked at......chances are, it’s on its original filter!

pletevl · 15th February 2019, 08:46

Don't forget the wiring loom around the inlet manifold can and does get damaged / breaks with age and especially with too much engine movement the wires can break.

13th February 2019, 20:01	#1
murphyv310 This is my second home Hyundai i10 998cc Join Date: Mar 2012 Location: Kilmarnock Posts: 6,602 Thanks: 2,088 Thanked 2,298 Times in 1,349 Posts	1996 Rover Mini question Hi. A non 75 question that could help out a friend. My friend has had this "P" reg Mini for a good few years. It has a very intermittent misfire, all the usual things have been tried over the years and TBH many things have been replaced umpteen times. It is the fuel injected version and as far as I know it has not had a T4 session or even if it can be T4'd He is prepared to travel to get a diagnoses, can anyone here help, if so I'll pass on the info. Many thanks. __________________ Cheers from Trevor MM0KJJ

13th February 2019, 20:53	#2
sworks Been absent for a while… Rover 75 Tourer, Classic mini Cooper S, Abarth 595 competizione, MG TF and a Hyundai Tucson PHEV Join Date: Feb 2007 Location: Cumbria Posts: 13,065 Thanks: 1,033 Thanked 1,686 Times in 1,040 Posts	It can be T4’d using the blue lead. Being 1996 it will be an MPI. Misfire could be anything from plugs to leads to the coil pack. Plenty of mini specialists out there so shouldn’t be too hard to sort. __________________ ................................................. 'Marmite' Possibly one of the most famous 75 tourers produced! left the production line as the last of only Three Rover 75 tourers produced in Trophy Yellow. 48 hours later Longbridge closed. The last sold ordered 75 Tourer. Paid for by the Phoenix Four and handed over by John Towers to the Warwickshire Northampton Air ambulance service as a Rapid Response vehicle Last edited by sworks; 13th February 2019 at 20:59..

14th February 2019, 09:20	#4
murphyv310 This is my second home Hyundai i10 998cc Join Date: Mar 2012 Location: Kilmarnock Posts: 6,602 Thanks: 2,088 Thanked 2,298 Times in 1,349 Posts	Hi. Thanks everyone. A bit more info...... The car is an MPI with twin injectors and doesn't have the vacuum sensor, perhaps that may be a clue or change the goalposts!! __________________ Cheers from Trevor MM0KJJ

14th February 2019, 10:07	#5
Ravinder This is my second home Rover 75 saloon x2, Rover 75 Tourer x2, Rover 220 Coupe Turbo Join Date: Aug 2010 Location: Kirkcaldy, Fife Posts: 9,036 Thanks: 2,278 Thanked 2,852 Times in 1,718 Posts	Trevor, ikmsure paul (mininuts) will post soon. He knows his minis well. __________________ Wanted - Indian bride. Cash waiting. (All sorted - bargain) First name and forum name: Ravinder Rover 75 2.0 CDT Connoisseur SE 116 (160 remap) Royal Blue (JFM) This vehicle was the 50,481st 75 to run off the production line, out of 112,381 This vehicle was the 2,238th 75 CDT Connoisseur SE to be made out of 3,775 This vehicle was the 5,002nd 75 in Royal Blue (code: JFM) to be made out of 14,420 Royal Blue 75s

14th February 2019, 12:55	#6
Bogbrush82 I really should get out more....... BMW X3 2.0D Join Date: May 2017 Location: Tipton Posts: 2,383 Thanks: 51 Thanked 765 Times in 421 Posts	Has he considered a leak back test to check the condition of his injectors? __________________ Current car: BMW x3 2.0d (The one with the M47 engine!) Rolled off the line on December 14th, 2004.

13th February 2019, 20:59	#3
minimutly Posted a thing or two mg zt Join Date: Mar 2014 Location: cardigan Posts: 1,087 Thanks: 28 Thanked 187 Times in 158 Posts	Things you can do yourself - well he could anyway! Check for water in the fuel tank - more common than you think. By removing and tipping out the contents of the fuel filter, running the pump into a bottle etc. Remove and hang the ecu up with the vacuum line facing down, preferably somewhere warm. Fuel has been known to condense in the vac sensor in the ecu. Put a dvm on the wiper of the throttle pot to measure the voltage as the throttle is slowly opened - it should sweep gradually upwards to 5? Volts from memory, no jumping about, just gradual change. Have a look at the pins on the big plug on the ecu for greening. Can't think of anything else.

14th February 2019, 19:19	#7
Discofan Loves to post (Land)Rover Freelander 2 Join Date: Jan 2015 Location: Stuck in the 1980's Posts: 477 Thanks: 118 Thanked 135 Times in 94 Posts	If you check out "The Mini Forum" they have a dedicated technical section for the later fuel injected classic Minis, loads of info and assistance on there.

14th February 2019, 22:06	#8
mininuts This is my second home Cooper S 210 Join Date: May 2012 Location: Port William Posts: 5,309 Thanks: 5,098 Thanked 2,406 Times in 1,631 Posts	Hi Trevor Like said, could be a host of things alongside the obvious things One thing worth checking is the coil pack. I had a similar issue on my MPI Mini when I bought it, turned out to be a hairline crack in the coil pack which was virtually invisible. Apparently quite a few have failed in this way. Cost around £50 for a new Lucas one so, not too expensive to try. Probably not the cause but, also worth checking the fuel filter that is located on the rear subframe of all places These can be a nightmare to change due to corrosion so, they rarely get looked at......chances are, it’s on its original filter! __________________ *Paul* 2016 MINI Cooper S 210 : 2000 Rover 75 CDT Classic SE : 2009 Freelander 2 GS : 2000 Mini Cooper Sport : 1986 Mini Mayfair : 1980 Mini Pickup : 1971 Mini Cooper S

15th February 2019, 08:46	#9
pletevl Posted a thing or two rover 75 cdti(rhd), MG ZR(lhd), MG TF(lhd), MG TF(rhd), mini mpi (lhd), Renault megane III (awful) Join Date: Mar 2014 Location: East of France Posts: 1,278 Thanks: 124 Thanked 114 Times in 93 Posts	Don't forget the wiring loom around the inlet manifold can and does get damaged / breaks with age and especially with too much engine movement the wires can break.