2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

an idle problem fix........(not obvious)

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Old Sep 6, 2002 | 07:09 PM
  #1  
deggial's Avatar
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Interceptor
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From: Saskatoon,Canada
an idle problem fix........(not obvious)

make a long story short...(not really , I guess)

had surging at idle at first, then car wouldn`t idle at all, had to stay on the gas to keep car running

checked the usual culprits ( TPS, BAC, connections, etc.,).

finally disconnected the BAC, upped the idle so it wouldn`t stall.

Noticed when car was in gear, clutch disengaged, rpms would drop by 200-300rpm; also when revving the engine, as the rpms dropped , at around 1200 rpm the engine run incredibly rough unless I took it out of gear.

traced the problem to a bad clutch switch. Replaced switch and no problems anymore.


Comments??
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Old Sep 7, 2002 | 02:47 AM
  #2  
deggial's Avatar
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Interceptor
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From: Saskatoon,Canada
should`ve specified `86 N/A
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Old Sep 7, 2002 | 01:49 PM
  #3  
mazdaspeed7's Avatar
mad scientist
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From: Savannah, GA
Should have searched I posted this probably 6 months ago
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Old Sep 7, 2002 | 06:27 PM
  #4  
deggial's Avatar
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Interceptor
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From: Saskatoon,Canada
I hardly come here any more, every time I do a search I came up with the stuff I already know about. Oh well
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Old Sep 7, 2002 | 07:25 PM
  #5  
Wankel7's Avatar
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From: Indiana
Bad clutch swith? How does that interrelate to idle?

James
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Old Sep 7, 2002 | 07:33 PM
  #6  
RETed's Avatar
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From: n
Sure, been there, done that...

Remove the clutch switch totally, and the idle never drops below 1100RPM or so.&nbsp This happens when the piece-of-**** plastic stopper on the clutch pedal breaks and allows the switch to slip into the now vacant hole.&nbsp This is obvious when you hear a loud click under the dash everytime to lift off the clutch pedal.&nbsp Although not identical to your problem, it's pretty similar.

Sorry, dunno why this is so, but I guess the ECU keeps track of the clutch switch and somehow bumps up idle for some screwed up reason...


-Ted
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Old Sep 7, 2002 | 08:20 PM
  #7  
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From: Tucson
ur talking about the button that has to be depressed for the car to start? my frend had a 87 sport, taped the button down so he cud jus start it up with out pressing the clutch. seem to idle and drive ok.
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Old Sep 8, 2002 | 07:50 PM
  #8  
Wankel7's Avatar
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From: Indiana
Well uh. My 86 will let me start the car with the clutch out all day. Maybe I should fix that switch.

James
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Old Sep 8, 2002 | 07:59 PM
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von
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From: sandiego, ca
Hey. My clutch pedal makes a tic sound everytime I depress it. Whats up with this? Can this cause a slipping clutch?
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