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Discussion Starter #1
My rover has started playing up. The story goes. On start up in a morning all seems fine and sits happily at fast idle until reaching normal operating temp. When it falls to normal idle speed the car seems to shake and become very rough. Steering wheel vibrates, gear knob shakes, interior mirror vibrates. Upon my daily morning drive down the M1 2 junctions the idle seems to feel smoother but not as smooth as it shoud be. Mirror and steering wheel stop vibrating, but gear knob stiull shaking. There is still a vague feeling of roughness to the engine though. Whilst driving all seems ok, no power loss no stalling, do get a second of vibration through out the car about 3000 revs though. Tried changing the usual plugs, dizzy cap, rotor arm, leads, fuel filter, air filter and coolant temp sensor but to no avail.
Any advice please people??
 

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Don't know if its the same on the 214 but on the 216 the warm idle speed is set independently of cold idle. Might be worth adjusting the base idle speed if poss - on my 216 you have to disconnect the wire from the IACV (can't remember what it stands for but know what it looks like!) and twiddle a screw until all is sorted. Then pull the hazard warning fuse for 10 secs to cancel the engine fault code, reinsert and you're fixed. But the 214 might be completely different...!
 

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Discussion Starter #3
Yeah, completely different on 214. There is no way to manually set the idles without a T4. Its all done by the stepper motor.
 

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mgf
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It is...

Honda 1.6 uses PGM-FI engine management, Rover 1.4 K series uses MEMS. Base idle is set in conjunction with T4 or a suitable FCR and cannot be done "manually"..

Brian.
 

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okay - teach me to stick to the cars I own! :doh:

A last bit of uninformed speculation on the 214 (my dad used to have one) - wasn't there some kind of sequence of stamping on the accelerator pedal x times, turning the key y times, and doing a little dance around the car (or something similar) that reset the MEMs and made it rethink its idle speed?
 

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mgf
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Turn ignition on, press throttle pedal through full travel and release it 5 times. Wait a few seconds and you should hear the stepper index itself. Start engine.

Brian.
 

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is it definitely to do with the idle speed?

when i had my nova (before i was got the rover) i had a problem sort of like this, and sometimes the car would just cut out completely when stood still, even if it was warm.

the problem was to do with the 'points' (i think, but not really sure) on the carburetta. all that needed doing was taking them out and blowing the dust out. my usual mechanic did it for me for free.

not sure whether you're experiencing the same but its worth finding out if it could be something this simple!

Paddy
 

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It's electronic ignition so it has neither a carburettor nor points. Have you checked that the ignition coil is ok and that it is receiving the right current from the ECU?
 

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Discussion Starter #12
Coil has been replaced.
Had a bit of success over the weekend. Had a look at the throttle body really closely and it seemed that one of the throttle return springs had come disconnected. Its the coiled spring on the throttle cable side of the housing, the one which returns the idle stop screw to the stepper motor pin. The throttle was only returning via the other spring behind the tps. Reconnected the spring and there seems to be a lot more resistance when opening the throttle by hand in the engine bay. After starting the car and doing the gas pedal "pump 5 times" trick there seems to be a definate inprovement but alas the idle is still not completely smooth, but is better. Could the stepper need adjustment via a t4? I'm assuming its the stepper at fault, or being out of adjustment as reconnecting the spring has such an improvement.
 

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Discussion Starter #13
OH, sorry DD.
I do fiddle i just can't help it. I know I shouldn't as it always ends in tears. Please don't tell me off sir. :confused:
 

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bgunn said:
Turn ignition on, press throttle pedal through full travel and release it 5 times. Wait a few seconds and you should hear the stepper index itself. Start engine.

Brian.
Isn't it:

Start Engine
Floor the pedal 5 times
Switch off
wait a few seconds
Start Engine.
 

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mgf
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No need to switch off - the actual re indexing of the stepper happens a few seconds after you press the pedal the 5th time.. Turning it off and back on again would cause the stepper to re index again...

Brian.
 

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mgf
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Re index the stepper to a "base" (sometimes called runline) position based upon the throw of the TPS. It basically calibrates the throttle shut position in the ecu, and indexes the stepper out to a "known" starting/idling position..

The ecu will then adapt the stepper offset to keep the idle within limits.

Brian.
 

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mgf
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All models with MEMS.

That means all K series cars, and T series engined cars, and very late O series cars (montego)...

Brian.
 
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