60 replies to this topic

[Alpenflitzer]

You said it is an early Japanese SPI.  What is the year? Does the car has a accelerator pedal switch?

[AgentHubcap]

The car is a 1994 Mayfair. I'm not sure what a pedal switch looks like. It has a cable from the pedal to the throttle body, but nothing else at the pedal

[FlyingScot]

I asked this in #2 but no matter if there isn't anything else at the pedal it doesn't have the throttle switch (used for idle control on early SPI MEMS system)

FS

[Alpenflitzer]

Did you check if you have a "ROVER" repairshop in the area? Sometimes they either have a Microcheck left from the old days or there is an older mechanic who knows about Rover Minis.

 

I got hold of an old telephone book from 1990 and found several rover repairshops. Last but not least one shop was still alive and they had a mechanic who knows about Minis.

[AgentHubcap]

Unfortunately, minis haven't been sold in the US since the 60s.  I'm 70% sure that the vac lines either got damaged or exposed a crack when I took the manifold off.  I've got a set of new lines that I have to put in, but haven't had time.

[FlyingScot]

Vacuum lines are you can read on here are the most common defect. Don't forget the fuel trap, it's needed to protect the MAP sensor which is inside the MEMS ECU.

FS

[Alpenflitzer]

One of the most critical vac pipes is the little black one going from manifold to fuel trap.

 

Since I changed to silicon with 3 mm dia. I never had vac problems again. They do not need the black ends - you just stick them on the nipples.

[AgentHubcap]

Managed to change the vac hoes today with brand new 3mm ID silicone hoses.  The car is running again, but it is still has the hesitation issues when cold.

 

Things I've changed up to this point:

Coolant temp sensor

Oxygen sensor

Intake temp sensor

Vac hoses with 3mm ID silicone hoses

Thermostat (88C)

[FlyingScot]

Have you checked the wiring I quoted in #18?
Replacing parts without checking they are connected properly to the ECU will not have any effect.
Without a diagnostic set up you need to confirm that the wiring isn't an issue (or the connectors or relays).
Both the PTC and the heater element in the lambda sensor are fitted to aid when the motor is cold (but different functions)

FS

[AgentHubcap]

The o2 sensor heater is getting power.  

What is the PTC?

[FlyingScot]

Heated plate under the inlet manifold  image.jpeg   53.03K   3 downloads


 image.jpeg   62.02K   4 downloads

FS

[AgentHubcap]

Ugh...not looking forward to checking that guy. I know it is plugged in at least.

Is that an item that fails?

[FlyingScot]

Just check it gets a voltage when ignition turned on and car cold.There's only one lucar connector to it.
They burn out especially if the relay in the MFU (multi function unit - aka relay box) gets stuck or the wiring is duff.

FS

Edited by FlyingScot, 01 January 2016 - 01:13 AM.

[Alpenflitzer]

PTC = Pressure Temperature Compensator - Inlet - SPi 1992-96

 

Cost approx. 140 GBP !!

[AgentHubcap]

"only" £99.75 from minspares