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Old 01-14-2009, 04:56 AM   #1
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Random dying

So lately the car will randomly die on me if I take too long to shift (or coast to a light). Started happening last week, and does so 1-2 times per drive.

Always when the car is warm.

1991 900 turbo.

Any ideas? I looked through all the vacuum connections and they looked ok...
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Old 01-14-2009, 06:18 AM   #2
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Mine does this too.


Only when warm. Drives me nuts.

I have no idea what it is.
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Old 01-14-2009, 06:23 AM   #3
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do these older generation cars have a crank positioning sensor?
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Old 01-14-2009, 06:31 AM   #4
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Mine does this too.


Only when warm. Drives me nuts.

I have no idea what it is.
I'm comfortable with chalking it up to randomness. Although it never used to ever, and now it does it regularly.

Jessop do you still have the compression tester? I think I should do that one of these days.
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Old 01-14-2009, 06:40 AM   #5
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i think when my spg had that symptom it eventually fully died and wouldnt start at all. it was some ignition piece that sits out in the driver side fender kinda, and it gets hot and acts up. i forget what it is tho...



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Old 01-14-2009, 06:53 AM   #6
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my 88 did this same thing i got a new one of the little "throttle decelerator" and it helped it out
http://www.eeuroparts.com/Main/PartD...spx?id=9314501
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Old 01-14-2009, 07:29 AM   #7
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I have JK's compression tester.

I have tried 3 different dashpots, with no luck.

Ignition amplifier maybe?

I don't think a bad head gasket will make it stall when hot, I would think it would be the other way around...
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Old 01-14-2009, 07:32 AM   #8
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I remember mine did this 5 years ago or so. We replaced the ignition module and it went away, I kept a spare in my glove compartment until the day I removed the stock ignition system.
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Old 01-14-2009, 07:36 AM   #9
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Hmm, I think I have one of those around.


Too bad the car is 20 miles away.
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Old 01-14-2009, 07:37 AM   #10
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Ignition amplifier maybe?
i think thats the thing i replaced, and what was giving me these symptoms.



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Old 01-14-2009, 08:14 AM   #11
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Quote:
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I have JK's compression tester.
That's where that went! Forgot you still had it I think you have my buffer too.

Quote:
Originally Posted by spgeebee88 View Post
my 88 did this same thing i got a new one of the little "throttle decelerator" and it helped it out
http://www.eeuroparts.com/Main/PartD...spx?id=9314501
Yes.

Quote:
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I have tried 3 different dashpots, with no luck.
Did you try a NEW decel dashpot? I bought a new one first and it worked so much different than ANY used one I had around. Meaning, it actually worked.

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Ignition amplifier maybe?
Not a bad thing to try, should be cheap at U-Pull. Go on eeuroparts and see what other cars they cross over to and keep an eye on the U-Pull R-Parts inventory.


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I don't think a bad head gasket will make it stall when hot, I would think it would be the other way around...
I'm with you on this one, doubt it would be the HG, but it never hurts to do a compression test for other reasons.

Another thing would be to pull the AIC valve and flush it with WD40 and lube it with some clean oil.
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Old 01-14-2009, 08:23 AM   #12
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The dashpot was new on the car when I got it, as well as the AIC. I flushed/lubed that as well, just to see.

I had 2 other dashpots too, and they felt the same.

And yes, I have your buffer. I moved it, and your supplies into the basement so they don't freeze.
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Old 01-14-2009, 08:27 AM   #13
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And yes, I have your buffer. I moved it, and your supplies into the basement so they don't freeze.
Schweet!

Yeah, give an ignigtion module a shot!
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Old 01-14-2009, 09:10 AM   #14
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Schweet!

Yeah, give an ignigtion module a shot!
?
http://www.eeuroparts.com/Main/PartD...spx?id=8980534

I didn't think the HG had to do with the stalling, it just came into my head as I was typing a non-related post.
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Old 01-14-2009, 09:17 AM   #15
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Another thing would be to pull the AIC valve and flush it with WD40 and lube it with some clean oil.
Clean this?
http://www.eeuroparts.com/Main/PartD...spx?id=7586019

Where is that in the engine bay?
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Old 01-14-2009, 09:49 AM   #16
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Quote:
Originally Posted by Champ View Post
Clean this?
http://www.eeuroparts.com/Main/PartD...spx?id=7586019

Where is that in the engine bay?

On top, in front, drivers side.
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Old 01-14-2009, 10:15 AM   #17
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On top, in front, drivers side.
Thank you young sage.
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Old 01-15-2009, 05:05 AM   #18
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If it helps at all, the car has started to "surge" a tiny bit if I am on the highway going between just a little throttle and no throttle. Like when you let off the gas, the car will buck a bit. Not always, just sometimes.

Does that point to the throttle decelerator thing?
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Old 01-15-2009, 05:08 AM   #19
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Now that I think about it, your c900 is a '91 and doesn't have a decel dashpot.

I still think it would be a good idea to clean the AIC valve. Very easy to do on a c900 too.
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Old 01-15-2009, 05:16 AM   #20
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If it helps at all, the car has started to "surge" a tiny bit if I am on the highway going between just a little throttle and no throttle. Like when you let off the gas, the car will buck a bit. Not always, just sometimes.
My car does this too, not sure why but I feel like it's been getting worse this winter. I know it's not the motor mount, because mine is solid aluminum. The inner drivers are OK...I think it's fueling.

As to your stalling problem (which I don't have), do the revs drop any time you shift at higher rpm? Does it happen when at low rpm? Sounds an awful lot like a bad BPV, which is somewhat common on these cars.
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