Last post on Aug 11, 2013 at 2:16 PM
You are in the Pontiac Montana
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Pontiac Trans Sport, Pontiac Montana, Van
#1382 of 1493 Re: 2000 Pontiac Montana [Wanderin_Ed]
Dec 02, 2008 (8:06 pm)
You sound like you know allot more then I do but just wanted to share that after my nephew cracked my filter housing on my 1998 Pontiac Tran-Sport I had to be careful about going through puddles... I would lose allot of my power while driving due to the filter getting wet. It to would sputter. Sounded like a jalopy strolling down the street. It sounded bad but disapated as the filter dried out. You never know, Could be something so simple. Lol!!
#1383 of 1493 1998 Pontiac Transport with DTC P0420 showing every 50-100 miles
Dec 30, 2008 (2:20 pm)
I have a 1998 Pontiac that has been plagued with DTC code P0420 showing every 50-100 miles of rural driving. I have replaced the catalytic converter (after market) and the aft oxygen sensor. No other codes are showing up when read. I can clear the code and about 100 miles, it shows up again.
The code cleared for about 1500 miles after the cat was changed and started getting more frequent. The frequency has not changed with the replacement of the aft oxygen sensor.
Car runs fines and gets 19-22 MPH in highway/town driving.
Any suggestions would be much appreciated.
#1384 of 1493 Re: 1998 Pontiac Transport with DTC P0420 showing every 50-100 miles [fryman]
Jan 05, 2009 (3:37 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 1493 1999 Montana Rear Heater
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 1493 Re: Dying while driving [mbollwerk]
Jan 23, 2009 (9:16 am)
I'm having the same problem with my 2005 Montana. Did you end up replacing the map sensor? If yes, did it help?
#1387 of 1493 Re: Dying while driving [edelandcdel]
Jan 23, 2009 (3:15 pm)
yes. changing the map sensor solved my problem.
#1388 of 1493 Re: Dying while driving [edelandcdel]
Jan 26, 2009 (10:53 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 1493 cold/wet starting running issues
Jan 27, 2009 (4:58 pm)
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 1493 1999 Pontiac Montana misfires
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.
Feb 24, 2009 (6:28 am)
I'm guessing: a bad ignition module.