12 replies to this topic

[R F Developments]

Hello again.

Having finally appeared to sort the wiring since my previous post (unknown plug position being put down to a combination of looms and both body and engine items having the same plug as sprocket pointed out) I attempted to start the car this weekend for the first time since rebuild.

As always with me there was a couple of small issues with oil and water leaks leaks on initial turnover before main start.

When it came to starting the car, she fired first time but ideled at high RPM ( Estimated 2500-3000 RPM, no rev counter fitted yet)

I have read the SPI problem pages and can find nothing simular to high idle RPM.

I have indexed the throttle as per manual by using the throttle and set up the lost motion linkage. (my pedal has no switch although manual says it has???)

As the car is away from my week work address I am compiling a list of things to check before this weekend, first thing will be the vacuum pipes from manifold to trap and ECU me thinks!

Any more ideas would be appreciated and thanks everyone for all your help so far, I would be lost without it.

Cheers Steve.

[Git]

Hi Steve,
I didn't think I had a throttle switch at first, looking on the internet, all I could find were ones that were on the side of the throttle body, however, eventually I fount it on my pedal, it's just a couple of wires leading to a connector, see pic.

[DaveRob]

What Year SPi, what model car is it, do you have the ECU part number ...starts with MNE... is the ECU 1 or 2 plug type. High Idle can be lots of things... Im assuming the car ran fine before but that dosnt mean a sensor has gone down... the more likly problem is an air leak somewhere... to start with id be checking all the gaskets around the throttlebody and the manifold. Also when you set up the lost motion gap are you sure the stepper is WORKING correctly. Lots of info required but If you can get us some more data we can all chip in and see if we can come to a solution. Map sensor tubes are a possibility but 2500-3000 sounds to high for that issue..... Do you have an aftermarket air filter.... If so you have blocked off the red tube like in the instructions???....

Sorry if this seems to be more Q's than A's....but more info required to provide an accurate assessment

DaveRob

[R F Developments]

What Year SPi, what model car is it, do you have the ECU part number ...starts with MNE... is the ECU 1 or 2 plug type. High Idle can be lots of things... Im assuming the car ran fine before but that dosnt mean a sensor has gone down... the more likly problem is an air leak somewhere... to start with id be checking all the gaskets around the throttlebody and the manifold. Also when you set up the lost motion gap are you sure the stepper is WORKING correctly. Lots of info required but If you can get us some more data we can all chip in and see if we can come to a solution. Map sensor tubes are a possibility but 2500-3000 sounds to high for that issue..... Do you have an aftermarket air filter.... If so you have blocked off the red tube like in the instructions???....

Sorry if this seems to be more Q's than A's....but more info required to provide an accurate assessment

DaveRob

The car is a 1993 Cooper SPI. The ECU is single plug part number MNE 10092 0833 4047.

The car was running fine prior to minor strip.

It has now got a SW5i cam kit fitted , self modified head and inlet manifold (nothing extreme)
Hi lift rockers are also included along with a Ram Air filter.

Red pipe has been blocked off.

My father has played with the car today and seems to think the idle had slowed (still too high)but this could be our imagination or hope!

Thanks for your intrest.

Cheers Steve.

[R F Developments]

What Year SPi, what model car is it, do you have the ECU part number ...starts with MNE... is the ECU 1 or 2 plug type. High Idle can be lots of things... Im assuming the car ran fine before but that dosnt mean a sensor has gone down... the more likly problem is an air leak somewhere... to start with id be checking all the gaskets around the throttlebody and the manifold. Also when you set up the lost motion gap are you sure the stepper is WORKING correctly. Lots of info required but If you can get us some more data we can all chip in and see if we can come to a solution. Map sensor tubes are a possibility but 2500-3000 sounds to high for that issue..... Do you have an aftermarket air filter.... If so you have blocked off the red tube like in the instructions???....

Sorry if this seems to be more Q's than A's....but more info required to provide an accurate assessment

DaveRob

The car is a 1993 Cooper SPI. The ECU is single plug part number MNE 10092 0833 4047.

The car was running fine prior to minor strip.

It has now got a SW5i cam kit fitted , self modified head and inlet manifold (nothing extreme)
Hi lift rockers are also included along with a Ram Air filter.

Red pipe has been blocked off.

My father has played with the car today and seems to think the idle had slowed (still too high)but this could be our imagination or hope!

Thanks for your intrest.

Cheers Steve.

Having now looked deeper it appeared all was ok with the vacuum pipes. Never the less these were removed and checked thoroughly.

Once refitted and the engine run, the tickover appeared better and smooth.

Once the throttle had been touched though, both at pedal and injection unit, the car stalls?

I do not know if I have sorted one issue and now have another one or if this all may be related?

[ICAM]

Dear R F Developments,

Could you post your engine bay picture for better understanding.

[DaveRob]

The high idle COULD be related to induction side air leaks....but now you have a stalling problem Id be tempted to look at your Throttle position sensor and , (if fitted) the accelerator pedal switch. The MNE10092 ECU, ((V)BD060488 upto (V)BD069492).... looks like the type without the accelerator switch as its replacement is the MNE101070 the last type named is the one I have , its def for a Cooper and I belive the ECU that you have is an uncoded non accel switch type, ( but could possibly be mistaken). If this is the case Id be seriosly checking you TPS pot on the throttle body as this is where the signal for idle is taken from when you dont have a accel switch and the engine dying is a sign that the TPS isnt sending the right voltage when the throttle arm is actuated.

Just my thoughts and might not be TOTALLY accurate

DaveRob

[R F Developments]

Thanks for all the advice. I feel I will get there eventually!

Unfortunately I am away from the car and have no pics.

As suggested I definately do not have a throttle pedal switch.

Is the Throttle Position Sensor a servicable item and is there away of checking it for condition?

I do not know if I made it very clear but the car does rev and drive (so far only on the drive) and only dies when the throttle pedal is released.

Ounce again thanks for all the help, it is appreciated.

[DaveRob]

The TPS is replaceable...to assess the state of it you will need a digital multimeter with an ohms range.... if you dont have one I pass by the wittering area regularly ...if you want I can pop in with my diags kit and my electronics stuff and help you out....send me a pm if you need this..

Cheers
DaveRob

[R F Developments]

Thats very good of you, thankyou.

Lucky for me I have a number of replacement parts ,all be it second hand, as the car came with a spare engine including injection system, loom, sensors and ECU.

I will let you know when I manage to get the car here. (Located in Mansfield at moment due to lack of storage space.)

Thanks Steve.

[BoyracerAU]

Just a thought.

I've read many times that a lot of people have been under the mistaken impression that indexing the throttle can be done using the throttle pedal. This is not the case, it needs to be done from within the engine bay. Just a thought.

[R F Developments]

Yes I did the indexing under the bonnet, thanks for the thought.

Cheers Steve.

[R F Developments]

Hello all.
Just to update things on my situation.

Theis weekend I ran the car again. After about 5 mins of static low speed running the car appeared to decrease its own idle speed to an acceptable level of about 1000RPM.
Upon throttle application engine responded with a slight misfire (nothing major) and returned to the increased RPM on throttle release.
At this stage I took the car for a sneaky run up the street. This resembled a display from the Red Arrows as a large amount of smoke was released from the exhaust. This soon dissapeared and with a further 10 mins of static running all appeared OK with an idle speed of about 1000 RPM.

I can only presume and hope that the contaminents which had been in the cylinders (anti deterioation oil) and oils in the head from the machining process had been affecting the oxygen sensor and thus engine running.

I will keep you updated upon future developments and would like to thankyou all for you intrest and help.

Steve.