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Pontiac Montana

1454 messages,  Last post on Nov 30, 2009 at 10:36 AM

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What is this discussion about? Pontiac Trans Sport, Pontiac Montana, Van

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#1384 of 1454 Re: 1998 Pontiac Transport with DTC P0420 showing every 50-100 miles [fryman] by john1432 Jan 05, 2009 (3:37 pm)
Replying to: fryman (Dec 30, 2008 2:20 pm) P0420 is a unique code that will set when the pre and post o2 sensors toggle at the same rate and speed. ( indicating cat has no reserve capacity ) The ecm will also perform invasive testing of the cat. Many of the 3.4 engines are known for repeat head gasket and or intake manifold issues, extended operation with coolant contamination will damage cat. Have you noticed any coolant or Oil loss? The design of this engine and its intake gasket can cause engine oil consumption ( not as popular as coolant on this vehicle ) the only other suggestion would be oem converter I've obtained them from salvage yards opposed to generic.
#1385 of 1454 1999 Montana Rear Heater by critter2008 Jan 18, 2009 (12:02 pm)
No vacuum going to the rear heater airbox to let hot air into the rear vents... anyone know where the vacuum line starts?! I'm pulling my hair out trying to find the vacuum source!
#1386 of 1454 Re: Dying while driving [mbollwerk] by edelandcdel Jan 23, 2009 (9:16 am)
Replying to: mbollwerk (Nov 29, 2008 7:21 pm) I'm having the same problem with my 2005 Montana. Did you end up replacing the map sensor? If yes, did it help? Replies to this message: bikeral (Jan 23, 2009 3:15 pm) mbollwerk (Jan 26, 2009 10:53 am)
#1387 of 1454 Re: Dying while driving [edelandcdel] by bikeral Jan 23, 2009 (3:15 pm)
Replying to: edelandcdel (Jan 23, 2009 9:16 am) yes. changing the map sensor solved my problem.
#1388 of 1454 Re: Dying while driving [edelandcdel] by mbollwerk Jan 26, 2009 (10:53 am)
Replying to: edelandcdel (Jan 23, 2009 9:16 am) I did not change my MAP Sensor. My problem ending up being the non-mechanics they hire at Wal-mart. My wife had taken the car to get an oil change. Somehow the personel had unhooked the whole air intake from the filter to the throttle body. They did not replace it correctly leaving a huge gap between the housing the Mass air flow sensor. Once I realized that, I hooked up the air filter and intake tube correctly, my problem went away.
#1389 of 1454 cold/wet starting running issues by rock_lab Jan 27, 2009 (4:58 pm)
Hi everyone!   I have a 1999 Pontiac Montana (3.4 L, extended cab) with 200k miles, it was the first new car I ever bought, and I find it to be a good vehicle. I've driven this GM-Doraville product from Florida to Nova Scotia and Virginia to California. Yes, the transmission needed replacement at 140k, and the head gasket blew at 170k. However, the latter was on a family trip through the Mojave desert when I was really pushing it (even then, this van got me to San Diego - did not strand me in Las Vegas - and I will forever be grateful). I like Pontiacs and I hope to drive this one another year or two.   About 6 months ago, the car began intermittently to have trouble running from a cold start: it would start fine, but would sputter and misfire when I would give it gas and try to run above idle. (The exhaust smells very rich while this sputtering occurs.) After about 5-10 minutes of idling, when the engine warms up, it runs ok. The weird thing is, when it is really cold (~25 F in LA, that's lower Alabama, brrrrrr) the car starts and runs ok, without the warm-up... so, this problem is related to temperature or moisture (cold here means dry, too). I never get a check engine code when starting, but if I get on the highway and step on it, it runs a bit rough and I've seen two codes: 'misfire on #4 cylinder' and 'Catalytic converter under efficiency.' A dealership mechanic kept it a week, with this behavior, and he could not figure it out. (He did say he tried a new coil pack, with no change.) I replaced the thermostat and the fuel filter yesterday, but no change. Also, the spark plugs and wires were new at 170K.   I'd be grateful for any suggestions to help me fix this.
#1390 of 1454 1999 Pontiac Montana misfires by jackkorno Feb 24, 2009 (6:07 am)
Hi their, I have a 1999 Montana I have tried to read the OBD2 however I can not seem to get a connection, so no codes.   What would cause me all kinds of Misfires ? At times it runs okay, then the check engine light will flash and she will misfire.   Can anyone give me a list of things to do to it. ? or check.   just got a new fuel pump that cost me $700 what a money pit.
#1391 of 1454 misfire by kkollwitz Feb 24, 2009 (6:28 am)
I'm guessing: a bad ignition module. Replies to this message: jackkorno (Feb 25, 2009 2:36 pm)
#1392 of 1454 Re: misfire [kkollwitz] by jackkorno Feb 25, 2009 (2:36 pm)
Replying to: kkollwitz (Feb 24, 2009 6:28 am) I will stick a new one on. And see what happens. Thanks
#1393 of 1454 Misfire on #1 by jackkorno Feb 28, 2009 (6:16 am)
Misfire on #1 could this just be a plug and wire ? it is on a 1999 Pontiac Montana.   Any help would be great ?

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