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Author Topic: 2000 Pontiac Montana (intermittent stall)  (Read 3188 times)

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Offline GargoyleK1

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2000 Pontiac Montana (intermittent stall)
« on: October 19, 2011, 10:57:05 AM »
3.4 liter engine
no codes
stalls occasionally
always restarts without issue

Runs fine, no other issues. 191,251 miles on it. I have been driving it for 2 days without issue. On the way to work today it just died while coming to a stop, started right back up and was fine the rest of the drive. It's a loaner and has stalled on 2 other customers. I have some ideas of where to go but I would still like your thoughts on this.

Thanks!




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Online InsaneCheverolet

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Re: 2000 Pontiac Montana (intermittent stall)
« Reply #1 on: October 19, 2011, 11:36:15 AM »
Those are lots of fun. You wouldn't happen to have a scan tool with a graphing feature or a good snap shot feature??
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Offline GargoyleK1

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Re: 2000 Pontiac Montana (intermittent stall)
« Reply #2 on: October 19, 2011, 01:45:02 PM »
Yes I do have that... Thought about hooking it up like that just not sure what to monitor first.




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Online InsaneCheverolet

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Re: 2000 Pontiac Montana (intermittent stall)
« Reply #3 on: October 19, 2011, 02:30:11 PM »
It kind of depends on how many pids of data can be shown or recorded at one time. and how fast the update rate of the scan tool is. But the things I would look at are rpm, 3x signal, 6x or 18x ( can't remember which is used in this application), Injector pulse width, Battery and ignition voltages, cam and crank signals (if available), iac, tps, and egr position. Then drive it and hit the appropriate button when it fails. The trick is to figure out which is causing the problem and which is the pcm's reaction to the problem, or what the pcm is doing to compensate for the issue. Ie rpm is dropping so the iac and fuel control are adding counts and fuel. good luck it looks like a nice day for a long drive. ;D
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Offline tbird

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Re: 2000 Pontiac Montana (intermittent stall)
« Reply #4 on: October 19, 2011, 05:46:11 PM »
I dealt with a 2001 grand prix that kept doing the same.  However it is a 2.2ltr.    Never once thru a code.   Found the vac. hose to the map sensor to be in bad shape.    Replaced the hose and its been fine for several years.     

I realize these motors are completely different.      Just throwin it out there.    Otherwise I got nothing when Insane comes in.
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Offline not-a-t a

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Re: 2000 Pontiac Montana (intermittent stall)
« Reply #5 on: October 20, 2011, 11:32:01 AM »
I agree with what Insane said. Graphing scanner with a good sample rate . I've had a few 3.1/3.4 that the crank sensor would drop out for a sec. intermittently. 
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Offline GargoyleK1

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Re: 2000 Pontiac Montana (intermittent stall)
« Reply #6 on: October 20, 2011, 04:40:35 PM »
OK thanks for the input guys. Ill see what i can come up with. Once i know ill let yall know.




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Offline Eric68

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Re: 2000 Pontiac Montana (intermittent stall)
« Reply #7 on: November 05, 2011, 08:40:19 PM »
Now I'm no wiz on any of the new stuff, but something I've seen has been the lockup converter not unlocking.  Causes stalls when stopping. 

You could also try re-setting the dwell angle on the points  :o  ;D
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Offline DavisRacing

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Re: 2000 Pontiac Montana (intermittent stall)
« Reply #8 on: November 06, 2011, 03:03:34 AM »
so any updates??
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Offline GargoyleK1

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Re: 2000 Pontiac Montana (intermittent stall)
« Reply #9 on: November 06, 2011, 09:36:12 AM »
Not yet... I drove it for 3 days and it stalled on me one time. Of course there was no scanner hooked up at that point recording. Once there was a scanner hooked up there were no other stalling issues for 2 days.

We loaned it out... And hour later it came back on the flat bed. Customer freaking out of course. I go over to it and it fires right up with no noticeable problems. It's been parked ever since as we have been getting 4 newer loaner cars on the road. I think they may be planning on just getting rid of it. It's an older van anyway.

But if something changes and I learn something I will let yall know.




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Re: 2000 Pontiac Montana (intermittent stall)
« Reply #10 on: November 06, 2011, 10:54:03 AM »
You get one like that and they can be real fun. I've driven them home and even for the weekend and still they don't act up.  It can be a real pain to diagnose because I have seen perfect lab scope patterns on sensors till they fail. Sometimes you just can't win.
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Offline DavisRacing

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Re: 2000 Pontiac Montana (intermittent stall)
« Reply #11 on: November 06, 2011, 11:18:10 AM »
LOL sounds like the lightnings , right Danny
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Re: 2000 Pontiac Montana (intermittent stall)
« Reply #12 on: November 06, 2011, 12:18:23 PM »
Ya it does. Fortunately on that one I at least had an idea. I just had to prove it. ;D
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Offline GargoyleK1

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Re: 2000 Pontiac Montana (intermittent stall)
« Reply #13 on: December 21, 2013, 10:49:08 PM »
I know its a little late on this one but I did finally figure it out.... 2 years ago... roflmao

It was the wire from the crank sensor to the ignition box (module). It seems the wire holder (plastic clip) gave out and that allowed the wire to ever so lightly touch the exhaust heat shield which over time wore a tiny little hole in the insulation. Well on the "left" turn and left turn ONLY the wire would sway just enough to touch the heat shield and ground out the signal causing the van to die.

Don't remember what I did to finally find it... I know the scanner wasn't hooked up at the time. I think it was just a feeling of what it was once I actually felt it act up a few times so I investigated further and found that... Felt like a crank sensor issue type of thing so concentrated there...

Anyway thought I would post a late follow up on it... It's been running great since then but finally blew a head gasket so I am pretty sure its done for now... [lol]  IE: not gonna get fixed.




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Offline Madduc

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Re: 2000 Pontiac Montana (intermittent stall)
« Reply #14 on: December 21, 2013, 10:51:45 PM »
Hook up some nawz to it and do it in for good! BWAHAHAHA
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