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Mk1 1.8 Idle Problem

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rossyl
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Re: Mk1 1.8 Idle Problem

Postby rossyl » Fri Aug 09, 2019 9:04 pm

So....it's not the ICV or the Throttle Body.

I was having a new clutch fitted when it was spotted that the "switch" that lets the ECU know that the car is in gear, was discovered as completely broken.

This was replaced.

It now idles spot on. Dead on 900rpm.

Thanks to Freelance Mazda.
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Re: Mk1 1.8 Idle Problem

Postby Mazda Mender » Sat Aug 10, 2019 9:50 am

I did ask about pressing the clutch???
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Mk 1 Eunos 93 black V.S II 1.8 ,
Mk 2 .1/4 Roadster 99 black & gold V.S 1.8 being rebuilt,
Mk 1 Eunos 90 1.6 (claimed by daughter)
MK 2.1/4 Blue V.S Roadster 1.8 99 ...being rebuilt

http://www.mx5oc.co.uk/ http://www.mx5nutz.com/forum/ http://miata.net/ http://www.autolinkuk.co.uk/
rossyl
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Re: Mk1 1.8 Idle Problem

Postby rossyl » Sat Aug 10, 2019 11:31 am

rossyl wrote:Hi

So I finally got round to giving it a decent run. Sorry for yeh delay in responding, but wanted to drive it for a while to have a proper look before getting back to you.

As above, I changed the MAF which I feel has now "settled down".

It now very occasionally surges to above 1000 RPM, then drops just above stalling.

Or very occasionally, drops pretty low for a shirt while before recovering.

It tends to happen when the car is hot, after a hard run, and is then sat idling and stationery.

Dipping the clutch makes no difference.

Would appreciate your thoughts.

Thanks


Yep...I had checked that and clutch in or out made no difference to idle
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Re: Mk1 1.8 Idle Problem

Postby Mazda Mender » Sat Aug 10, 2019 12:04 pm

Idle drop with pressing the clutch is common from a dead or busted clutch switch.
M-m
The Disclaimer:-
This post is a natural product made from recycled electrons. The slight variations in spelling and grammar enhance its individual character and beauty and in no way are to be considered flaws or defects, the articles/answers/comments are provided for information purposes and they are not intended to substitute informed professional advice, I or mazdamenders.net cannot personally be hold responsible for any damage occurred from following this procedure or any injuries from it. Proceed at your own risk.


Mk 1 Eunos 93 black V.S II 1.8 ,
Mk 2 .1/4 Roadster 99 black & gold V.S 1.8 being rebuilt,
Mk 1 Eunos 90 1.6 (claimed by daughter)
MK 2.1/4 Blue V.S Roadster 1.8 99 ...being rebuilt

http://www.mx5oc.co.uk/ http://www.mx5nutz.com/forum/ http://miata.net/ http://www.autolinkuk.co.uk/
rossyl
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Re: Mk1 1.8 Idle Problem

Postby rossyl » Sat Aug 10, 2019 12:17 pm

Unfortunately didn't have that symptom.

Thanks for all the help though
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seagryhill
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Re: Mk1 1.8 Idle Problem

Postby seagryhill » Mon Aug 12, 2019 8:37 am

Thanks for closing this one out, it's always appreciated. Another source of a rough idle issue and added to the (long) list.

Interesting that when this and other sensors fail it seems to result in a rough and erratic idle. Sounds like the ECU software has a bale out clause if it detects an error that it cannot relate to a specific error code. Do the later cars with OBD have as many issues with rough idle?
Mk1 G-Ltd Eunos 1.8 (well sort of, all the bits except the shell)
Mk2 1.8 restored (was dead, now it's alive)
Toyota Hilux for towing MX5s on trailers

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