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Idle stumbles when put in gear

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Old 10-23-02, 12:45 PM
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Question Idle stumbles when put in gear

Yes I searched!

The idle is fine when in neutral or with the clutch pushed in but as soon as I put it in first gear, it drops about 500rpms and tries to die.

The car runs good after I get it going, it's just a hassle from a stop.

Any ideas?
Old 10-23-02, 01:00 PM
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Can't live without boost.

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I have the same problem, but my car starts to drop idle up and down when the parking lights or headlights are turned on at night time.

I'm thinking it could be the alternator because my battery is brand new so it could not be hold a strong enough charge. It doesn't bother me enough right now to replace it, but I'll get to it eventually.

-Dan
Old 10-23-02, 05:10 PM
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Mine does it all the time, no accessories need to be on.
Old 10-23-02, 05:22 PM
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Mine does this too, but my car has never stalled on me. I just put a optima in not too long ago as well. My guess is the alternator.
Old 10-24-02, 10:35 AM
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My car has the same problem too...anyone has this fixed before?

Thanks in advance!
Old 10-24-02, 11:11 AM
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I posted this same question a while ago.

https://www.rx7club.com/forum/showth...hreadid=116056

Try that...
Old 10-24-02, 11:18 AM
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I see....Thanks a lot!
I shall check it out tomorrow.....
Old 10-24-02, 11:21 AM
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My volts are fine so it's not the altenator.

When I put it in gear, the vacuum drops and the a/f goes rich.
Old 10-25-02, 12:30 AM
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OK, so everyone (3 people) that has had this problem hasn't fixed it?

Someone has to know what this is.
Old 10-25-02, 01:52 AM
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Sorry, add number four. Put in gear, vacuum goes from 19 to 16, rpms drop, then recover. I've taken to blipping the throttle as I shift into first.
Old 10-25-02, 07:20 AM
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make it 5, dont pay it any mind , car has never stalled.
Old 10-25-02, 07:29 AM
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Try the clutch switch. There is a small spring-loaded switch mounted high on the clutch pedal that often breaks. My car used to die with the AC on and the clutch in as soon as I put it into first. $7.00 part cured the problem.
Old 10-25-02, 09:49 AM
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I was thinking it was the clutch switch, but I can sit all day long with the clutch in and it won't do it.

Is it $7 from Mazda, if so I'll just replace it?
Old 10-25-02, 11:12 AM
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Couple things to note: 1) When I shift into 1st from neutral, I get an oscillation in the vacuum, from 19 to 16 and back again. Does this about three times. The RPMs change comensurately, but do so FOLLOWING the vacuum (i.e. vacuum causing rpm shift, not the other way around); 2) the manual calls out for not only a clutch switch input to the ECU, but a neutral switch AND and 1st gear switch AND a second gear switch. What the manual does not elucidate is what the ECU is doing with this info. Anybody know this?

Blackscorpio's right, it doesn't stall (mine, anyway) but I'm one of the hyper **** ones that wants to know why my car does ANYTHING I don't expect. Jeez, at this rate I'll have a heart attack (myocardial infarction?) by 35! But three years of blasting my FD will be worth it.
Old 10-25-02, 04:28 PM
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I don't think it's the 1st-2nd switch because it does it in any gear. Might be the neutral switch or the clutch switch($14). So where is the neutral switch?
Old 10-25-02, 04:38 PM
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Manual page J-29, top of the X-mission, in front of blind cover housing. Probably a total bitch to get to. Manual does show the proper continuity for all this on F-186-187, as well as good locational stuff..
Old 10-25-02, 06:48 PM
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Thanks alot spurvo
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