Clutch In, Revs Down
Clutch In, Revs Down So this weird thing happened to me yesterday. I had been driving my car all day. Stopped at a store, came out 10 minutes later and started it. Didn't notice anything odd until i went to back out. The car seemed to sputter. Looked at the tach and it was at like 500rpm!!! It shot up after i engaged the clutch, would go back down for a second, and then sputter back up to normal (1100rpm) Whenever I would put the clutch back in, it would sink down to 500rpm. I did this a few times, until i pulled the car over to an empty section of the parking lot and shut the car off. Waited a few seconds, restarted, and everything was fine. Have not gotten it to repeat since. What could the problem have been??? Is this a sign of anything to worry about??? Thanks in advance
Revs going too low when clutch is in My car has started to do something very curious the past couple of weeks. Periodically when coming to a stop and putting the clutch in, my tach will dip down to about 700-800rpm, and then come back up to the normal 1100rpm. Usually happens when coming to a stop in first or second gear. Maybe this is more of a drivetrain forum question, but i'm not so sure the problem is with my clutch. Any ideas?????
Launching!
Joined: Nov 2001
Posts: 219
Likes: 0
From: Westminster, CO
Re: Revs going too low when clutch is in Have you adjusted the idle or increased the size of the idle hole in the TB? Your idle is way high for a M6. I normally idle around 750-850 per Autotap.
Only thing I can really think of is if the clutch isn't fully disengaging. If you are on a level road and have the clutch in, does the car roll forward at all?
Only thing I can really think of is if the clutch isn't fully disengaging. If you are on a level road and have the clutch in, does the car roll forward at all?
Re: Revs going too low when clutch is in I have not done anything to the throttle body. The car does not normally roll forward on level ground. I thought that an idle of 1000-1100rpm was normal for an M6 car. It has idled at that rpm ever since i got the car. If it was idling too high, wouldn't that trip a code?? Any other ideas as to what could be causing my rpms to dip like that??
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Re: Revs going too low when clutch is in My car is a 1998. It has idled that way since i got it. I have had it in for service a few times and nobody has said anything about it. If in fact the idle is bad, then how do i go about adjusting it. I don't have auto-tap.
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Verdad Gallardo Re: Revs going too low when clutch is in Could the problem just be with my tach?? Maybe my car does idle right at 850rpm, but my tach is just off. I mean, if it was in fact idling to high, wouldn't that trip a code?
Re: Revs going too low when clutch is in Did you buy it new? What duartion of time was there between the installation of the Ported MAF ends and your idle issue?
Tach could be off. But you would still have a problem with idle dipping.
Tach could be off. But you would still have a problem with idle dipping.
Re: Revs going too low when clutch is in If IAC is in control, the idle should stay
fixed after warmup. Neutral, or clutch in +
in gear, don't care.
If IAC is old and spoogy, it gets slow to
react, may "hunt" and while "hunting" may
drift too low. If it drops when you put
it in gear w/ clutch depressed, but then
recovers (if you're not flapping yer feet)
then IAC is working, but slow. Try and see.
If IAC is not in control (like with an
overdrilled blade hole, the stop screw
jacked up, etc.) then idle will respond
to everything. Including for example the
drag from a crusty throwout bearing or a
clutch that's slightly warped / not fully
disengaged and dragging.
fixed after warmup. Neutral, or clutch in +
in gear, don't care.
If IAC is old and spoogy, it gets slow to
react, may "hunt" and while "hunting" may
drift too low. If it drops when you put
it in gear w/ clutch depressed, but then
recovers (if you're not flapping yer feet)
then IAC is working, but slow. Try and see.
If IAC is not in control (like with an
overdrilled blade hole, the stop screw
jacked up, etc.) then idle will respond
to everything. Including for example the
drag from a crusty throwout bearing or a
clutch that's slightly warped / not fully
disengaged and dragging.
Re: Revs going too low when clutch is in I've had the ported MAF ends since summer, this didn't start happening until about a month ago. The idle stays constant with the clutch in no matter what gear its in. It will only do it if I am coming to a stop after having the revs up pretty high (say around 2500-3000rpm) When i put the clutch in the revs drop, as they should, but they just drop too far, then pop right back up. I've tried to listen for it as well, but to be honest with you i can't hear the engine sound like its going to low. And its not like my headlights dim for a split second, or my charge gauge is affected by it at all. This is why it kind of leads me to believe that it may be a gauge related problem. However my tach is not showing any other signs of having a problem, such as lagging or anything like that.
!Dial-up Director
Joined: Nov 2001
Posts: 3,100
Likes: 1
From: Louisiana
Re: Revs going too low when clutch is in The 98s tach is off 200rpm form the factory, at least everyone I have seen. Mine shown 1000rpm on the stock tach and 800 on the autometer/atap.
Justin
Justin