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Old 02-01-2008, 07:44 PM   #1
Albiem
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Question Engine stalls when clutch is pressed

My 1994 Saturn SL2 with 1.9L twin cam engine and 5 speed manual transmission stalls when I press the clutch while stopping. The problem first appeared a couple of months ago but only when the A/C was off. Now, the problem is getting worse and happens when the A/C is either on or off. Any suggestions?
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Old 02-01-2008, 07:59 PM   #2
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Default Re: Engine stalls when clutch is pressed

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Originally Posted by Albiem View Post
My 1994 Saturn SL2 with 1.9L twin cam engine and 5 speed manual transmission stalls when I press the clutch while stopping. The problem first appeared a couple of months ago but only when the A/C was off. Now, the problem is getting worse and happens when the A/C is either on or off. Any suggestions?
does keeping on the gas slightly as you press in the clutch keep the engine running?
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Old 02-01-2008, 08:14 PM   #3
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Default Re: Engine stalls when clutch is pressed

Yes, but it's kinda difficult to do since I am trying to stop!
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Old 02-01-2008, 08:35 PM   #4
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Default Re: Engine stalls when clutch is pressed

Based on how scratchy my clutch was getting before I replaced it, I suspect that your pressure plate and throw-out bearing are shot. That basically means install a clutch kit.
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Old 02-01-2008, 08:58 PM   #5
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Default Re: Engine stalls when clutch is pressed

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Yes, but it's kinda difficult to do since I am trying to stop!
i think you need to go into the the How-to library and look up a post by Barnowl on the clutch hydrualics. follow them and see if that leads to any results.

Also try the creep test. On level ground in an open parking lot, put the clutch in and give it gas. If the car moves, then like above, your pressure plate fingers are probally on thier way. a new clutch assembly would have to follow.
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Old 02-02-2008, 05:25 PM   #6
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Default Re: Engine stalls when clutch is pressed

Thanks for the advice. My clutch has started slipping a little bit lately. I will give the creep test a try and let you know what happens.
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Old 02-02-2008, 05:34 PM   #7
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Default Re: Engine stalls when clutch is pressed

does the car maintain an idle properly when in neutral?
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Old 02-03-2008, 03:23 AM   #8
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Default Re: Engine stalls when clutch is pressed

A failing clutch can't possibly make the engine stall in this situation. If it slips, the engine will idle or race independently of the car speed. If it fails to disengage, the car movement will keep the engine running.

Your engine is supposed to idle fast (1200-ish) when you coast in neutral (or clutch down), and then drop to 800-ish when you stop. The IAC (idle air control) valve accomplishes this. I would suspect that yours is faulty.
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Old 02-03-2008, 10:18 AM   #9
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Default Re: Engine stalls when clutch is pressed

I believe that a failing clutch can make an engine in a marginal state of tune stall. The pic below shows the condition of my pressure plate when I finally changed it. The throwout bearing had a groove worn in its face. I put the replacement off as long as possible. At the end, I could barely shift into first gear; I sometimes used second. The car was hard to start and I started to hear a clunk from the clutch after startup. There was a lot of noise from the clutch that I had grown accustomed to. At a stoplight, the engine would shudder when I depressed the clutch, but did not stall, as it was in a good state of tune.

When replacing the clutch, I found that there was still a fair bit of material left on the friction disc. It was not close to slipping. After replacement, I found that the engine started easier as the starter faced less resistance. The clutch was quieter without the clunking and groaning.

I don't recommend letting your clutch get as bad as mine was.

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Old 02-03-2008, 10:30 AM   #10
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Default Re: Engine stalls when clutch is pressed

your throwout bearing was probably shot, so when you were pressing on the clutch pedal you weren't getting fully dissengaged. The failing the creep test is a sure sign of a bad throwout. My truck started doing that all at once, couldn't get it into first at all. Had to start it in neutral and force it into second to get it to the repair shop. I didn't wait, waiting on something like that isn't the greatest thing for the synchros.
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Old 02-04-2008, 03:51 PM   #11
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Default Re: Engine stalls when clutch is pressed

I tried the "creep" test with favorable results (no creep). The clutch slips somewhat in first gear upon takeoff. The car used to idle at around 1200 rpm with A/C on and about 800 rpm with A/C off. Since then, the idle drops to almost 0 no matter whether the A/C is on or off. As of yesterday, I noticed that the A/C is not cooling properly. Any thoughts?
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Old 02-04-2008, 04:01 PM   #12
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Default Re: Engine stalls when clutch is pressed

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Originally Posted by madpogue View Post
A failing clutch can't possibly make the engine stall in this situation. If it slips, the engine will idle or race independently of the car speed. If it fails to disengage, the car movement will keep the engine running.

Your engine is supposed to idle fast (1200-ish) when you coast in neutral (or clutch down), and then drop to 800-ish when you stop. The IAC (idle air control) valve accomplishes this. I would suspect that yours is faulty.
I agree, worn clutch is not going to cause this stalling problem. It is somewhere in engine management. (IAC, TPS or such not clutch here)
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Old 02-04-2008, 05:03 PM   #13
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Default Re: Engine stalls when clutch is pressed

I'm with the other two, if its not creeping on you, then the clutch is disengaging properly so something else must be going on here, unrelated to the clutch.

By any chance, when the engine stalls, do you have your other foot on the brake? Could be a bad brake booster, leaking vacuum that size will stall an engine easily.
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Old 02-04-2008, 06:06 PM   #14
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Default Re: Engine stalls when clutch is pressed

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I'm with the other two, if its not creeping on you, then the clutch is disengaging properly so something else must be going on here, unrelated to the clutch.

By any chance, when the engine stalls, do you have your other foot on the brake? Could be a bad brake booster, leaking vacuum that size will stall an engine easily.
The engine stalls immediately when pressing the clutch pedal. If I momentarily "blip" the accelerator to increase the revs, the engine will slow but not stall.
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Old 02-04-2008, 06:19 PM   #15
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Default Re: Engine stalls when clutch is pressed

Does it matter how far down you press the clutch? What I'm getting at is the clutch switch. When you press the clutch all the way in, it operates the clutch switch, which allows you to engage the starter. I wonder if there is a wiring issue and when you push the clutch all the way in it triggers the switch and kills the car. Try not pushing the clutch all the way to the floor and see if it still stalls out.
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Old 02-04-2008, 06:31 PM   #16
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Default Re: Engine stalls when clutch is pressed

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Originally Posted by Albiem View Post
The engine stalls immediately when pressing the clutch pedal. If I momentarily "blip" the accelerator to increase the revs, the engine will slow but not stall.
I have had to do this with the A/C running. Learn how to heel-toe and it will help a bunch, until the problem is fixed. I have practiced my heel-toe tremendously through necessity for this very same problem.
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Old 02-04-2008, 07:16 PM   #17
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Default Re: Engine stalls when clutch is pressed

Quote:
Originally Posted by Albiem View Post
I tried the "creep" test with favorable results (no creep). The clutch slips somewhat in first gear upon takeoff. The car used to idle at around 1200 rpm with A/C on and about 800 rpm with A/C off. Since then, the idle drops to almost 0 no matter whether the A/C is on or off. As of yesterday, I noticed that the A/C is not cooling properly. Any thoughts?
passed the creep test eh? well pressure plate is good and so is the hydraulics. there fore, along with everyone else here, clean your Throttle body. make sure the IAC passages are nice and carbon free.
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Old 02-05-2008, 07:04 AM   #18
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Default Re: Engine stalls when clutch is pressed

I think the problem here is going to be a dirty throttle body, IAC or TPS. That said, this is a new guy. So you're supposed to ask, have you changed your ECTS?

And I just got a cool new blown ECTS with green crud. So, I made a new pic.

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Old 02-05-2008, 03:46 PM   #19
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Default Re: Engine stalls when clutch is pressed

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I think the problem here is going to be a dirty throttle body, IAC or TPS. That said, this is a new guy. So you're supposed to ask, have you changed your ECTS?

And I just got a cool new blown ECTS with green crud. So, I made a new pic.

I hate to sound dumb but, what is an ECTS? and where do I find it? Also, where is the OBDC connector found on a 1994 Saturn SL2?
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Old 02-05-2008, 04:36 PM   #20
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Default Re: Engine stalls when clutch is pressed

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I hate to sound dumb but, what is an ECTS? and where do I find it? Also, where is the OBDC connector found on a 1994 Saturn SL2?
ECTS is short for engine coolant temperature sensor.You will find it here labeled PCM sensor.
http://www.saturnfans.com/photos/sho...4/ppuser/32343

The data link is located under the driver's side dashboard.
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