Intermittant idle speed problem.

Engines, Transmissions & Final Drive questions and answers

Moderators: timk, Stu, -alex, miata, StanTheMan, greenMachine, ManiacLachy, Daffy, zombie, Andrew, The American, Lokiel

Post Reply
User avatar
Craig
Speed Racer
Posts: 6700
Joined: Wed Apr 23, 2003 11:00 am
Vehicle: Non MX-5
Location: Sydney

Intermittant idle speed problem.

Postby Craig » Sat Jun 17, 2006 3:42 pm

Hi,

If the cars in neutral and I let the clutch out the revs jump up to around 1500rpm. I can hear a switch clicking on the clutch pedal that tells the computer that the clutch is either in/out for whatever reason, but no idea why it's making my revs jump up intermittantly! :(

I've had the AFM, Throttle body, egr, idle all cleaned and it goes even harder now so I'm kinda stumped why it's doing what it's doing. Seems more prevalent when cold too although it throws no error codes so all seems well. Thoughts?

Craig
*** Audi Q5 55 Sportback - HYBRID! Zero -100 in 5.3 seconds! 8) ***
Top
User avatar
JBT
Speed Racer
Posts: 7946
Joined: Tue Jun 03, 2003 11:00 am
Vehicle: NC
Location: Brisbane

Postby JBT » Sat Jun 17, 2006 8:43 pm

What is the RPM with the clutch pedal depressed?
Image
Top
User avatar
Craig
Speed Racer
Posts: 6700
Joined: Wed Apr 23, 2003 11:00 am
Vehicle: Non MX-5
Location: Sydney

Postby Craig » Sun Jun 18, 2006 1:13 am

About 850-900...normal spec. It's almost like it thinks the air con is on and is bumping the rpms to counteract it! :?
*** Audi Q5 55 Sportback - HYBRID! Zero -100 in 5.3 seconds! 8) ***
Top
User avatar
JBT
Speed Racer
Posts: 7946
Joined: Tue Jun 03, 2003 11:00 am
Vehicle: NC
Location: Brisbane

Postby JBT » Sun Jun 18, 2006 8:53 am

I see what you mean Craig......weird......smells of some crazy ECU problem.

Is it possible to disconnect the plugs from the clutch pedal switch(es) and see what happens then?
Image
Top
User avatar
Craig
Speed Racer
Posts: 6700
Joined: Wed Apr 23, 2003 11:00 am
Vehicle: Non MX-5
Location: Sydney

Postby Craig » Sun Jun 18, 2006 1:27 pm

I could but I guess Mazda built it in for some reason. :?
*** Audi Q5 55 Sportback - HYBRID! Zero -100 in 5.3 seconds! 8) ***
Top
User avatar
Craig
Speed Racer
Posts: 6700
Joined: Wed Apr 23, 2003 11:00 am
Vehicle: Non MX-5
Location: Sydney

Postby Craig » Sun Jun 18, 2006 8:56 pm

A neutral switch eh? :? Well that would explain why it's clutch related and only happens intermittantly, as some days it's perfect, and the next day it plays up. How was it diagnosed and fixed and by whom? :)

Craig

P.S. Where is it and how much $$$ to replace? :mrgreen:
*** Audi Q5 55 Sportback - HYBRID! Zero -100 in 5.3 seconds! 8) ***
Top
User avatar
Uncle Arthur
Dodgy Award Benefactor
Posts: 1802
Joined: Wed Apr 23, 2003 11:00 am
Vehicle: ND - 2 GT
Location: Doesn't matter where I'm from-it's that your daughter is with me that's the biggest concern :D
Contact:
Contact Uncle Arthur

Postby Uncle Arthur » Sun Jun 18, 2006 9:11 pm

Sounds to me like your camel is just running a bit 'humpy'
Founder of the QLD Chapter of the Honourable Brothers of Dodgy.

Benefactor of the Perpetual Dodgy award - Inaugural year 2007.
Top
User avatar
Craig
Speed Racer
Posts: 6700
Joined: Wed Apr 23, 2003 11:00 am
Vehicle: Non MX-5
Location: Sydney

Re:

Postby Craig » Sun Jun 18, 2006 10:48 pm

Uncle Arthur wrote:Sounds to me like your camel is just running a bit 'humpy'


Who rattled your cage! :!: :P
*** Audi Q5 55 Sportback - HYBRID! Zero -100 in 5.3 seconds! 8) ***
Top
User avatar
JBT
Speed Racer
Posts: 7946
Joined: Tue Jun 03, 2003 11:00 am
Vehicle: NC
Location: Brisbane

Postby JBT » Mon Jun 19, 2006 8:14 am

I thought the NB had some switches activated by the clutch pedal and one of them was called a neutral switch. Have a lookhere and see the post by Bill Strohm.

Can you get under the dash area and press the plunger on any clutch activated switches there to replicate the clutch pedal being depressed and see if the idle RPM drops?
Image
Top
User avatar
Craig
Speed Racer
Posts: 6700
Joined: Wed Apr 23, 2003 11:00 am
Vehicle: Non MX-5
Location: Sydney

Postby Craig » Tue Jun 20, 2006 12:32 am

Yeh there's one on the gearbox and two on the clutch pedal, which is clutch in/out and the other ones a cruise control cut out. Oddly enough the cruise control sometimes wants to work too so might just buy all 3 switches and be done with it. :)

Thanks guys! :mrgreen:
*** Audi Q5 55 Sportback - HYBRID! Zero -100 in 5.3 seconds! 8) ***
Top
User avatar
JBT
Speed Racer
Posts: 7946
Joined: Tue Jun 03, 2003 11:00 am
Vehicle: NC
Location: Brisbane

Postby JBT » Tue Jun 20, 2006 7:35 am

The gearbox one might just be the reverse switch.
Image
Top
User avatar
JBT
Speed Racer
Posts: 7946
Joined: Tue Jun 03, 2003 11:00 am
Vehicle: NC
Location: Brisbane

Postby JBT » Tue Jun 20, 2006 11:22 am

For the NA8. Should be similar for NB.
Image
Image
Top
User avatar
Craig
Speed Racer
Posts: 6700
Joined: Wed Apr 23, 2003 11:00 am
Vehicle: Non MX-5
Location: Sydney

Postby Craig » Tue Jun 20, 2006 12:33 pm

That's the sucker. I wonder if you replace it from the top (remove gearstick and surrounds) or it's a reach up from underneath jobbie? :?
*** Audi Q5 55 Sportback - HYBRID! Zero -100 in 5.3 seconds! 8) ***
Top
User avatar
Garry
Speed Racer
Posts: 3481
Joined: Sun Apr 27, 2003 11:00 am
Vehicle: NB SP
Location: God's Country
Contact:
Contact Garry

Postby Garry » Tue Jun 20, 2006 12:38 pm

Underneath for sure.
Shiney black one with added red bits. Member of the fart club. Now with extra doof and Sunlong. - deceased and gone to heaven
Top
User avatar
Craig
Speed Racer
Posts: 6700
Joined: Wed Apr 23, 2003 11:00 am
Vehicle: Non MX-5
Location: Sydney

Postby Craig » Tue Jun 20, 2006 12:53 pm

Bugger, means getting underneath the car! Oh well time to ring up for some prices for the switches.
*** Audi Q5 55 Sportback - HYBRID! Zero -100 in 5.3 seconds! 8) ***
Top
Post Reply

Return to “MX5 Engines, Transmission & Final Drive”

Who is online

Users browsing this forum: No registered users and 2 guests