5 replies to this topic

[ken22]

hi can somebody throw any light on the following problem.mini cooper 1992 spi,starts on the key and ticks over fine,while still cold accelerates ok.after about a minute when warmed a bit press the accelerator and it races up and down the revs and sometimes back fires in the fuel unit. If it was a carb model i would be looking at an air leak but spi i,ve no idea, i,ve checked the inlet manifold for leaks checked all the small bore suction pipes,changed the air temp sensor on the fuel unit,pulled the fuel pump out to check for leaks everthing seems fine,so any ideas anybody

[Fast Ivan]

sounds like it could be the throttle pedal switch, make sure its not getting fouled/restricted by carpets and check the switch itself

[xrocketengineer]

Try disconnecting the Oxygen sensor. It comes into play after the car reaches operating temperature but not while cold. It should run fine without the sensor. If not, something else is causing the problem.

[Island Mini]

Must be the throttle position sensor on the inlet manifold surely. If you're ticking over fine. Try disconnecting it. And also try disconnecting the stepper motor. If that helps I would say you're best just picking up a second hand spi manifold as that would be cheaper than buying the sensors. Also clean your lambda sensor while you're at it as suggested earlier as I found a few months ago it made a massive change.

[Captain Mainwaring]

sounds like it could be the throttle pedal switch, make sure its not getting fouled/restricted by carpets and check the switch itself

 

They don't all have this.

[ken22]

sounds like it could be the throttle pedal switch, make sure its not getting fouled/restricted by carpets and check the switch itself

bingo throttle sensor it was, thanks to all you guys for your input ,what a great site.