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[PhilRich]

I've still got a niggling feeling it's the throttle body flap

[terry paget]

Thanks for the suggestions, chaps. I have returned the car to my son, with the tap in the hose to the AICV. This allows me to set the idle at 800rpm engine hot. If I turn the tap closed the engine stops, so throttle flap seems OK, and there is no leak anywhere else. I changed the ECU coolant sensor a week ago, Andy, but nothing changed.

[terry paget]

I am not alone. This man had the same problem.I wonder how it ended.
http://retrorides.proboards.com/thread/159186/rover-speed-mindf-before-mental

[Andy H]

I am not alone. This man had the same problem.I wonder how it ended.
http://retrorides.proboards.com/thread/159186/rover-speed-mindf-before-mental

the thread goes on to say that the cam sensor and TPS have identical plugs and had got swapped during a head gasket change. Swapping them back fixed it.

Have you recently had a head gasket done or removed parts and reffitted them at all ?

Only ask as had another rover once of a similar era that was doing something similar and after a long while found that the throttle position sensor ,and the camshaft sensor have an identical wiring plug .......am sure you can tell we're this is going lol

Anyway it was found that when he had the head gasket done prior to his idle issue they had put connectors on wrong way round TPS switch wiring was plugged into the camshaft sensor and vice versa


Long shot but worth a try and please do let me know if the wiring plugs are the same on your car as it may just be possible that's what it is

stepper motors always go faulty and stick also

I read about these wiring plugs yesterday, so came down the garage today to check mine out. Guess what? They were on back to front! I swapped em over and its purring like a kitten! Flipping unbelievable, the amount of time i have wasted mucking about with that doesn't bear thinking about. Anyway its running super sweet now so next stop MOT station! Cheers everyone!

[Nick W]

Crank sensor and speedo drive are like that on certain Transits; change the clutch and the bloody thing won't start. I swore at that for ages, Rob fixed it in seconds. Which is yet more proof of the value of experience.

[aaronjb]

Given the car here has a cam sensor fault and the idle valve isn't working.. I'd say we have a winner there!

[henryd]

Given the car here has a cam sensor fault and the idle valve isn't working.. I'd say we have a winner there!

Yep,I'd go with that too

[terry paget]

Thanks chaps. I'm glad someone had the wit to follow the thread down. Today I got my hands on the Rover again and swifly swopped the cables to throttle sensor and cam sensor. I reset the stepper motor (5 throttle openings and closures on ignition 2), fired up, and I have idle!. So.happy ending and silly me for carelessness. I am surprised that Rover used 2 identical leads and sockets to connect to 2 sensors - see pic - and that engine ran without complaint without a correctly connected cam sensor and throttle sensor. I was unlucky that no-one on either the Omega or Rover 25 forums was aware of this possibility, and lucky that Google directed me to the Retro Forum where someone did.
https://www.dropbox.com/s/p5diab7to1xq5k7/sensors%26connectors50%25.jpg?dl=0

[terry paget]

Should have mentioned that the cam sensor can be seen hanging on its lead on left of picture, having been removed from cam cover.

[aaronjb]

You won't be the first or the last to make that mistake, I expect! Glad to hear it's sorted

[05omegav6]

I wonder how many left the factory the wrong way round