13 replies to this topic

[ClassicAsh]

My mini cooper Spi seems to run well but I have noticed that it seems to hold onto the revs to long, by that I mean if you come of the throttle the revs seems to stay at around 2000 rpm for four or five seconds before dropping down to the normal idle speed of approx. 1000 rpm. all the vac pipes are new and a good fit, and the engine has been refurbished. am I missing something simple? any ideas? thanks.

[cian]

Throttle linkage adjusted?

[pusb]

Throttle cable sticky?

[ClassicAsh]

the throttle cable sees to be fine in operation  having had an assistant operate it while I watch and the linkage sees ok to operate ok too.

[domdee]

this might be something to do with a leaking vacuum/breather pipe. Think ive read it before elsewhere. might be wrong though. typical for mpi/spi modles

[Sprocket]

Throttle cable adjustment maybe. see pinned topics.

Edited by Sprocket, 09 February 2017 - 01:19 AM.

[domdee]

http://www.theminifo...st#entry3225242

[ClassicAsh]

had a good poke about and everything seems ok cable seems to run in the correct place and isn't sticking, and all the breather pipes are new including the elbows etc. hmm another head scratcher ! but thanks for the reply's all

[brivinci]

This seems to be becoming a common issue with these. I have the same issue and have read a few threads over the years related to the same issue. Mine drops to maybe 1500 for a second or two (could be more) and then finally settles at the correct idle speed. All of my vac lines were replaced with proper silicone replacements to avoid the originals easy fail rate. My cable is fine as well. Everything seems to move as it should. Manually pulling back throttle pedal when this happens does not bring the revs down any quicker.

 

I do remember reading a thread where someone took apart there throttle body and found that a seal for (maybe) the butterfly shaft was torn and causing some erratic running/idle conditions.

[brivinci]

http://www.theminifo...st#entry3225242

Nice thread. Thanks!

[FlyingScot]

Check your TPS for smooth changes. It's a potentiometer and wears causing a noisy signal and/or a dead spot.
You can either measure on volts by backprobiing the connector or in plug and measure on ohms between the centre and outer pins.
This can confuse MEMS as it needs the output to tell the throttle pedal is at idle (first versions used a switch to do this)

FS

[brivinci]

I think this is the next thing I am going to do. Thanks FS

[ClassicAsh]

I will give the suggested things a try this weekend and see what happens. thanks all

[Alpenflitzer]

Cold: rpm 1200    warm= 850 rpm so it is told by the "Repairbook".

Have you checked this one?