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davemar

Mi16 high idle. Throttle body testing?

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davemar

I'm trying to get to the bottom of the high idle I've got on my Mi16 engine (1.9 running normal Motronic ECU). I've checked the throttle switch and that seems to function fine, and the electrics are all good.

 

I'm suspecting the throttle body plates aren't sealing as snuggly as they should when the throttle is shut. Am I right in thinking that at idle the throttle plates should be totally sealed shut and the idle relies on the air passing via the ISCV to get the air supply? So is there an easy way of testing how leaky the plates are?

 

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Tom Fenton

There is also a manual bypass with an adjuster screw. If you have checked everything else then you can adjust on that.

Refurbishing the mi throttle body isn’t hard I’ve done a few. The bushes the spindles run in wear out. 

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davemar

I gave it a good clean up recently when giving the engine bay a deep-clean. So clearing the muck out might have knocked the bypass adjustment out a bit. The lack of dirt might also be letting a bit more air through now too. I'll take it off and have a closer look.

 

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davemar

I gave the bypass screw a bit of a clean, and when it is now wound all the way in the idle drops to around 1300rpm. Still a little bit high, but not too bad. The spindles feel OK, and there's no unwanted movement in them.

 

 

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petert

Have you verified contacts in the TPS with a multimeter?

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davemar

Yes, two of the pins become connected when the TPS switches.

 

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