1993 Toyota Paseo - Engine dies when clutch depressed
(Originally posted under similar question about 1996 Paseo.)
Just started happening about an hour ago on my way to work. Had the car ('93 Paseo) for about 2 1/2 weeks and it's been great. Today, the RPMs suddenly started dropping when the clutch is pressed. It drops low enough to kill the engine. Briefly tried it while parked when I got to work. Idle is fine ~1000 rpm. But, when I press clutch, it drops to 500 or less and engine starts to stutter. What's going on? This came on suddenly at the end of my drive to work. Vacuum leak? Clutch suddenly lose adjustment? Where do I start?
Checked it a bit more after work. Doesn't seem to be clutch. It's actually the brake that seems to cause the larger RPM drop. Clutch seems to cause normal fluctuations from changing engine load. Got home and started looking for anything obvious around engine. Started with vacuum lines. Didn''t get too far before I realized that the air intake had come off of the throttle body. Reconnected that and it seems to be working ok now. One of the vacuum lines from the intake goes directly to the air control valve, the other feeds indirectly to the idle control valve. So, would it make sense that this could throw off idle enough that it can't respond to changing engine load at low RPM?
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Re: 1993 Toyota Paseo - Engine dies when clutch depressed
Absolutly, Your idle control valve at the end of your fuel rail has a vacuum line and its sensitive to pressure changes. One way to double check that would be to hook everything up normally and pull that vacuum line off your idle control valve. Are the symptoms the same?
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When you push in the clutch you are pushing the crank shaft forward in the main bearings but the action of the throw out bearing for the clutch pushing the fingers of the clutch pressure forward. For the engine to stall under this condition I would be checking the throw out bearing for seizure and acting as a brake on the pressure plate. Some clutch systems are part of the engine start system where you have to depress the clutch to start the engine (safety device) This may be faulty and shutting the engine down.
Before I send you to a shop to have the vehicle scope tested. Raise the idle about 25 to 50 rpm's, and see what happens. Many years ago I had a customer with the same problem. Turned out to be an idle adjustment . If this doesn't work or you can't adjust the idle on your vehicle . Then take it to a shop who does scope testing.
Your clutch hydraulic system is compromised. Look under the dash, where the clutch pedal has a rod going thru the firewall. If it is damp with oily fluid, your clutch Master Cylinder is leaking. Also, on the side of the transaxle, there is another cylinder, the clutch Slave Cylinder. It can be leaking, also. In any case, with a condition such as yours, I would recommend that you replace both the clutch master and slave cylinders. Over time, they can wear ionterally, and no develop the proper flui pressure to release the clutch.
It sounds like a may be a sensor thats going bad mass air flow MAF or TPS throttle position sensor but you need to get it checked out to be sure can you specify a little more as to when it happens and how it happens how often under what driving conditions and so on