Stalls out sometimes

Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
Your really going to waste a lot of money here approaching this in this manor. There are dozens of things that can cause symptoms as you describe but the 0/2 sensors are not one of them. The rear sensors have no effect on engine performance at all. This could be a bad mass Air Flow sensor but I still wouldn't replace it without some testing to verify it first.
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Thursday, October 11th, 2018 AT 7:32 PM (Merged)
Tiny
MIKEY122
  • MEMBER
  • 1 POST
  • 1999 PONTIAC MONTANA
  • 3.4L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 13,754 MILES
I have a 99 pontiac montaina V 6 when I put it in reverse it wants to stall out and it does and it soometimes want to do the samething in drive have checked the vacums and they are alright and put in a new fule censuer and punp but still have the problem it also revs up and wants to jump at stop lights.
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Thursday, October 11th, 2018 AT 7:32 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
For a start, I'd check anything that has to do with idler air system. Any applicable trouble codes? Some of the national brand autostores will check codes for free.

If your going to work on your own vehicle, at the least, an obd2 code reader is handy.
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Thursday, October 11th, 2018 AT 7:32 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Just to add, it runs ok off idle? There is a low idle code, p0506, don't know if that that code is set on your vehicle? You would check for any air restriction and check the iac.

Also your intake manifold gasket has been known to leak.
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Thursday, October 11th, 2018 AT 7:32 PM (Merged)
Tiny
DEALLIEB
  • MEMBER
  • 1 POST
  • 1999 PONTIAC MONTANA
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 220,000 MILES
I hope you can help with this one. I recently replaced all 3 ignition coils in my 1999 Pontiac Montana. About a month later it started acting like it was gonna stall. Then one day I turned the corner and car stalled. I could get it to turn over but it wouldn't start. Eventually some guys came over and got it started and I made it home a few block away. After that I left it parked and drove it a few blocks a couple days later. It would still hesitate, mailnly when I pressed the breaks. My brother in law replaced 3 of 6 spark plugs because that all he could reach. Now when I turn my car on the engine light flashes and when I put my car in any gear it stalls/ shuts off. Does this have anything to do with replacing the ignition coils? I also know I need a tune-up, Any ideas? Thanks!
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Thursday, October 11th, 2018 AT 7:32 PM (Merged)
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Remove ignition module and have it checked at most autoparts stores, if OK, then have fuel pressure checked.
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Thursday, October 11th, 2018 AT 7:32 PM (Merged)
Tiny
JIMWIN67
  • MEMBER
  • 1 POST
  • PONTIAC MONTANA
My 2000 Montana just had the fuel pump replaced, we just got it back yesterday and it keeps stalling out. It has about 215000 kms its is a V6. What can the problem be?
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Thursday, October 11th, 2018 AT 7:32 PM (Merged)
Tiny
WALLY83
  • MEMBER
  • 8 POSTS
My 2001 does the same thimg it turn out to be a egr valve sticking open my would work fine and then stop at lights stall but starts fine again and while taking off it would cut out and backfire
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Thursday, October 11th, 2018 AT 7:32 PM (Merged)
Tiny
KRICHES
  • MEMBER
  • 1 POST
  • 2000 PONTIAC MONTANA
  • 6 CYL
  • FWD
  • AUTOMATIC
Why does my pontiac montana stall right after I start the van?
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Thursday, October 11th, 2018 AT 7:32 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the fuel pressure if it's within specs and also if the injectors pulsing?
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Thursday, October 11th, 2018 AT 7:32 PM (Merged)
Tiny
DANAHOW
  • MEMBER
  • 4 POSTS
  • 2000 PONTIAC MONTANA
Other Category problem
2000 Pontiac Montana 6 cyl Wheel Drive Type unknown Automatic 120000 miles

when you shut off the car my antifreese pours out and im going through about 1 gallon every week or so.
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Thursday, October 11th, 2018 AT 7:32 PM (Merged)
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Where exactly is it pouring out.

Have you noticed any problems with drive ability?
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Thursday, October 11th, 2018 AT 7:32 PM (Merged)
Tiny
DANAHOW
  • MEMBER
  • 4 POSTS
It's driving just fine but we noticed that when it starts to get low the heater quits working, it pour out close to the front of the motor
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Thursday, October 11th, 2018 AT 7:32 PM (Merged)
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Is it possible that you can get me a picture of where its coming out off?

It only comes out when the engine is off not on?
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Thursday, October 11th, 2018 AT 7:32 PM (Merged)
Tiny
DANAHOW
  • MEMBER
  • 4 POSTS
When I shut it off is when it happens
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Thursday, October 11th, 2018 AT 7:32 PM (Merged)
Tiny
ED ARMES
  • MECHANIC
  • 129 POSTS
Could be coming from the engine oil cooler located at the base of the oil filter. These are an aluminum casting and will leak under high coolant temperatures which occur minutes after the engine is shut down. The extra heat that develops after coolant stops circulating will open up a smalll crack in trhe casting or welds. I have seen these leak before. About $ 250 from dealer. :Lol:
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Thursday, October 11th, 2018 AT 7:32 PM (Merged)
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Ed sounds pretty reasonable, that would be just about the only thing that would be causing it to come out of the radiator when the engine is off.
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Thursday, October 11th, 2018 AT 7:32 PM (Merged)

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