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Idle Speed Valve Gasket? Remove without removing air intake?

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andymaxwell
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Idle Speed Valve Gasket? Remove without removing air intake?

Postby andymaxwell » Mon Jul 27, 2015 6:37 pm

Hi All, quick question if that's ok.
I would like to remove my idle speed valve from my 1998 1.8 RS Import. Do I need to purchase a gasket for it, and can I remove it without taking off the throttle body?

Many thanks :)
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Re: Idle Speed Valve Gasket? Remove without removing air int

Postby Mazda Mender » Tue Jul 28, 2015 12:16 pm

Why are you removing it?
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 fettled,
Mk 2 .1/4 Roadster 99 black & gold V.S 1.8 being rebuilt,
Mk 1 Eunos 90 1.6 (claimed by daughter)
Mk 1 Eunos 96 1.8 blue B2...being fettled
Mk1 Eunos 93 1.6 black S special being fettled
http://www.mx5oc.co.uk/ http://www.mx5nutz.com/forum/ http://miata.net/ http://www.autolinkuk.co.uk/
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Re: Idle Speed Valve Gasket? Remove without removing air int

Postby Lazza » Tue Jul 28, 2015 12:18 pm

I doubt you'll get the ICV off without removing the TB. It's held on with 2 big Phillips screws which often need an impact driver to undo them.
I've never had to replace the gasket myself... but if I didn't have a spare lying around, sods law says I would tear it.
Lazza

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Re: Idle Speed Valve Gasket? Remove without removing air int

Postby andymaxwell » Wed Jul 29, 2015 3:37 pm

Thanks for the replies. I'm investigating a minor high idle speed problem. I've looked through many forum posts and cleaning out the ISV seems to be a good place to begin.

I don't wish to lumber you with the problem as it has been done to death in other places, but just in case I'm on the wrong tack and you fancy a look:
* Car sits at 1050rpm when warm, even after setting the base idle (jumpering the diagnostics box) to 850rpm.
* If I drive up to the traffic lights *in* gear the revs will drop below 1050 and carry on until it stalls. But if I instead keep it rolling, depress the clutch and stop the revs will climb back to 1050rpm.
*When the engine is cold and I'm coming to a stop, occasionally the revs will drop down below 1050rpm but it is accompanied by a hunting sound (feels like it's going to stall too). The car will then 'notice' this and the revs then climb back up to whatever they were before (being cold usually above 1050rpm).

For your further info I have already:
*checked the PCV valve (it was all ok but replaced the rubber socket thingy in the cam cover anyway)
*checked all breather hoses those leading to the throttle body from the cam cover
*cleaned the throttle body (the grey 'seal' on the bfly valve was already missing)
*changed spark plugs
*changed air filter
*cleaned air flow sensor in the air intake

To do: Check charcoal filter and hoses.

:obscene-drinkingcheers:
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Re: Idle Speed Valve Gasket? Remove without removing air int

Postby Lazza » Wed Jul 29, 2015 10:43 pm

A few things I'd check - engine temp sensor on the back of the head, O2 sensor & MAF but first I'd check to see if the neutral switch on the gearbox and clutch switch on the pedal are working.
Lazza

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Re: Idle Speed Valve Gasket? Remove without removing air int

Postby Mazda Mender » Thu Jul 30, 2015 7:17 am

Lazza wrote:but first I'd check to see if the neutral switch on the gearbox and clutch switch on the pedal are working.


:text-imwithstupid: :handgestures-thumbup: :coffee:
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 fettled,
Mk 2 .1/4 Roadster 99 black & gold V.S 1.8 being rebuilt,
Mk 1 Eunos 90 1.6 (claimed by daughter)
Mk 1 Eunos 96 1.8 blue B2...being fettled
Mk1 Eunos 93 1.6 black S special being fettled
http://www.mx5oc.co.uk/ http://www.mx5nutz.com/forum/ http://miata.net/ http://www.autolinkuk.co.uk/
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Re: Idle Speed Valve Gasket? Remove without removing air int

Postby andymaxwell » Thu Jul 30, 2015 8:58 pm

Thanks chaps I will give it a go and report back :).
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Re: Idle Speed Valve Gasket? Remove without removing air int

Postby andymaxwell » Wed Aug 05, 2015 10:48 pm

When checking the sensors and switches I think I'm going to get a garage to do it, I have a multimeter but am fairly clueless about what settings to use and more importantly I guess what voltages to look for (unless there are posts I've missed on how to check these things?).
I guess with the switches they are either on or off but would a garage know all the correct voltages to look for when checking the sensors?
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1998 Mk2 1.8 6-speed Jap RS
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Re: Idle Speed Valve Gasket? Remove without removing air int

Postby Mazda Mender » Fri Aug 07, 2015 7:32 am

Where are you?
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 fettled,
Mk 2 .1/4 Roadster 99 black & gold V.S 1.8 being rebuilt,
Mk 1 Eunos 90 1.6 (claimed by daughter)
Mk 1 Eunos 96 1.8 blue B2...being fettled
Mk1 Eunos 93 1.6 black S special being fettled
http://www.mx5oc.co.uk/ http://www.mx5nutz.com/forum/ http://miata.net/ http://www.autolinkuk.co.uk/
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andymaxwell
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Re: Idle Speed Valve Gasket? Remove without removing air int

Postby andymaxwell » Wed Aug 12, 2015 10:43 am

In the good old south-west, Bristol. And you?
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Re: Idle Speed Valve Gasket? Remove without removing air int

Postby Lazza » Wed Aug 12, 2015 11:13 am

andymaxwell wrote:In the good old south-west, Bristol. And you?

In his profile info. That's a nudge by the way. Location helps us recommend someone close to you who might be able to help :wink:
Lazza

2001 Mk2.5 MX5 1.8 Sport
BRP MP62 Supercharger
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