Pontiac - Montana :: 2004 - Hesitation Or Stumble As If Engine Cuts Out For A Second
Jan 19, 2015
I have a 2004 Pontiac Montana with 90K. If the overnight temperature has been below 40ish, there is a noticeable hesitation or stumble (almost as if the engine cuts out for a second-but never actually stalls out) on the 2 to 1 downshift when braking to a stop while the vehicle is in open loop. As the engine warms up the stumble becomes less noticeable until the temp gauge reaches the 1/4 mark at which point the stumble is gone. It won't return until the following morning - the next cold start. Our mechanic has cleaned the Throttle Body and the MAF- no change. Their transmission guy said he did not think it was a tranny issue. It has no other symptoms and seems to shift normally at all other times. What to do next??
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My van will rev really high when started and may stay that way for most of the day. Sometimes once it is turned off it will restart just fine. but when it is revving like this you have to hold the break down at stop lights, constantly slow down because it wants to take off. Now it is stalling when driving slowly. the throttle positioning censor has been replace a couple of times.
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I have a 2001 Pontiac Montana van, when i drive i feel like there is just not enough power there. Most of the time when i hit 30mph the engine drops in power, hard to explain so I will try my best. I get in turn the key starts right up with out any hesitation what's so ever! I leave for work, while driving when I come to a stop sign and stop and take off its gets sluggish so while my speedometer is going up my movement is not changing as it should so needless to say I have to do 80 85 mph just to keep up with the average moving can at 70mph.
Once in a while I will give it some gas and let go of it and it would back fire a little not sure why. Recently I had new head gaskets put on cause temperature was not staying where it was suppose to be, they smooth out the headers and did a tune up, not sure about the timing, New fluids, once in awhile the temp would climb but that cause of the fans. Took it to AutoZone they did a obd code check came back with O2 senser and nothing else, so if I replace this will it bring my van back to normal running operation? And would it be anything I could check to rule out?
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What is causing the engine to sound like it's not getting enough gas AFTER we turn off the A/C? The two times we have used the A/C, after we push the button to turn it off, the engine sputters like it is going to die ... sounds like it is not getting enough gas. It has over 178,000 miles on it and it sat for about three years before it was given to us.
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I have a 2004 Pontiac Montana minivan. I get a hard downshift from 2nd to 1st only when the engine is cold - especially noticeable in cold weather. After a mile or so of driving (or a few minutes of idling) is shifts fine. All upshifts are fine all the time. The tranny fluid level is fine and is in good condition. What it could be?
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I have a 2000 Pontiac Montana 3.4L V6. I keep getting code p0341 cam shaft sensor (replace), and code p0443 P0443....EVAP Emission Control System Purge Control Valve Circuit. I was getting p0441...Evaporative Emission Control System Incorrect Purge Flow (but I replace Canister Purge Valve that up top center right). I have also replace spark plugs and wires because it didn't seam to have any power.
(After I replace both the cam shaft sensor and purge valve) Now it does have good power but if I am moving at very low speed either stopping or starting it will almost die sometimes and sometimes it does die. If it actually dies it seams to give both the P0341 & p0443 codes but if it doesn't die and code light comes on after resetting it, it is just the p0443 code.
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I have a 2004 Pontiac Montana, and it just started making a low buzzing vibration noise when it's in motion. tone/pitch only changes with vehicle speed, not engine RPM. It becomes noticeable at about 20 MPH. Pitch starts low, gets a bit higher and faster as speed increases. Have looked for anything loose, nothing found. Braking is not a factor in the sound. Tires are good, Engine doesn't seem to be tied to the noise. Nothing noticed on body panels, air dam, etc... I suspect either transmission or possibly U-Joints.
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I have a 2004 Pontiac Montana with about 107500 kms on it (VIN: 1GMDX03E24D183870) and the coolant temperature gauge is not working properly. Sometimes when I start my van, the temp gauge is pinned at MAX temp and stays there the whole trip...other times it's pinned at MIN temp...and other times it seems to work OK.
When it's pinned at MAX temp, I check the actual temp that the on-board computer is seeing, by using my OBDII scan tool...and I get about 87 degrees C when I'm halfway into my trip (i.e. - when the van is at operating temp), which seems OK. All the other analog gauges are working perfectly.
I read a lot about the issues with "connector C305" on the Internet on the Montana vans...could this be the problem?
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First, a little background on my truck. 2007 with 5.4, 122000 miles, oil changes with 5-20 Motorcraft and Motorcraft filters, plugs done by dealer 40000 miles ago. The truck has developed a ticking noise, kind of like a lifter (I know these engines don't have lifters) that is most noticeable from the side of the truck near wheel. ticking speeds up with the rpm. Also around same time, between 40-55 under load there is a bit of a stumble, but I can gas thru it. I'm guessing these are related. I'm thinking spark plugs again, but shouldn't I get more than 40000 out of them? I might just take it in, since I've got oil leak somewhere around back of the oil pan, but figured maybe might get some clues first. Also, no CEL.
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I own a 2004 Pontiac Grand Am V6... recently it has developed a rough idle - kind of like the car is hiccuping - and it hesitates when I accelerate from a stop. Now, it doesn't have issues changing gears so I'm not inclined to believe its a transmission issue...thought it might be the fuel filter, but I changed it and that did nothing.. I'm not getting a check engine light, which is frustrating because if I try to pull the codes it won't throw me any... so it's a guessing game now. I've gotten mixed reviews - anything from a bad catalytic converter to a faulty O2 sensor or idle air controller or a bad head gasket.. but my exhaust is completely clean...others say maybe its bad spark plug wires or other electrical issue (which is a whole other ball game) or possibly bad fuel injectors causing a misfire?
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Vibrates above 45 mph. Did have tires balanced . Still happens.
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My 2000 Pontiac Montana squeaks while accelerating. There is about 55,000 miles on it. At first I thought it was a belt but it would squeak the whole time if so. It only squeaks (like a mouse), every time accelerating.
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I have a 2001 Pontiac Montana that was overheating. It was low on coolant, and using coolant. I took it to a mechanic who checked it out and found exhaust gases in the coolant. He initially told me that it was a bad head gasket. After doing a bit of research, I am told that it could also be an intake manifold gasket. I know I am losing coolant, but I cannot tell where. I don't think it is going into the oil, as my oil level does not go up. I do not see coolant leaking below the vehicle, so perhaps it is going into the exhaust? Or leaking slowly on top of the engine where it is burned off before it can go on the ground.
Is there any test I can do to determine which gasket is bad before tearing into the vehicle? I thought about sending an oil sample off to determine if I am getting any coolant in the oil, but I don't know if that would be useful information at this point.
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I have a 2006 Pontiac Montana, The little engine picture came up on my dash. I took it to the car parts store to have the code read and it came up as an O2 pre-heater sensor. My husband has been trying to google how to fix it and can't come up with anything. It doesn't even come up as to where the part is located.
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I have a 1999 Pontiac Montana that has recently started whining when I accelerate. It stops after I take my foot off the gas pedal. It usually takes about 15 minutes of driving before the whining starts. It started about 4 months ago and has recently become louder.
Van has 85K miles.
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The passenger air bag indicator light got pushed in so I need to get the vent panel off so I can push the light back flush. I do know the surrounding of the radio pops off without any tools. But taking that off doesn't get me anywhere. I still don't see access to remove the vents.
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I have a 2006 Pontiac Montana SV6 with 80,000 miles on it. Recently the dashboard warning "check gas cap" has started coming on. I have replaced the gas cap and cleared the code and it is doing it again. It seems like it is more likely to do it when the gas tank is 1/2 or less full but it also did it today with almost a full tank. The code from the computer said P0455, what this could be?
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I have a 2002 pontiac montana that needs the head gasket replace. Mileage is 152,000 miles with a v6 engine. I would like to get at least another 75,000 miles once the repair is done. Is it worth doing as alternative is to scrap the van and buy a new vehicle...
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Alright, my '06 SV6 AWD has a major problem...I'm about to blow it up! But seriously, I've had an issue for a few weeks now with intermittent acceleration/hesitation problems. Basically it started as a rare occurrence and is happening more often now. Yesterday, it did it consistently for 20 minutes on one trip around town. 1 hour later, it didn't happen noticeably at all on the way home. It happens while accelerating, usually from a stop, but also sometimes when cruising at highway speeds.
The car does not stall or stumble. Everything sounds fine and smooth, but when accelerating from a stop, the car will stop accelerating and the speed slowly drops off. Pushing the accelerator down further to the floor does nothing for several seconds, then the power returns and the car responds to whatever position the pedal is in. If you haven't pushed further it continues accelerating where you left off. If you've got it to the floor, it takes off quickly. When cruising at speed, you don't notice anything until you start slowing down, and the pedal reacts the same way. NOTE: The engine does not rev up when this is happening. It's not like the tranny is slipping.
It really seems like a fuel delivery problem and not transmission. It has all the normal symptoms of a failing pump. And about 2 months ago, I had the fuse for the fuel pump melt (not blow). These problems didn't happen immediately after, but they did happen a few weeks after that.
That said, I have noticed that when cruising I occasionally hear a light clunking noise that sounds like the rear diff engaging. I assume this is just due to play in the drive train. I also had to recently do the expensive versatrack fluid flush and fill to get rid of the diff groan. But I still feel like it's probably fuel related because the engine doesn't rev up.
Here's what I've done so far:
1. Checked the wires at the problematic C305 connector. I already had to completely redo that connector several years ago as the PO had removed the connector and directly twisted all wires together covered the with tape, and filled hole with silicon. BTW, GM does sell all of those harnesses with length of wire, connectors, and heat shrink covers for reasonable $$. Anyway, found 2 wires with insulation slightly shaved off. Neither was for the fuel pump, everything else still looked good.
2. Checked voltage at the gray fuel pump wire just after the new harness (about a foot before the fuel pump). And checked the ground at the same location. Haven't checked at pump connector because I don't want to drop tank just yet. Both were fine with almost no resistance on power between that location back to the fuse box. So, it doesn't look like a bad or shorted wire unless it is in that short length up to the fuel pump that I cannot access w/o dropping the tank.
3. Checked fuel pressure at the fuel rail. The pressure when primed and idling is a consistent 60-62 psi. I know the manual states 60psi as the max. Maybe this has something to do with it?? Perhaps my cheap actron pressure guage is a bit off or perhaps the pressure regulator is bad. Could this cause the issue.
4. Checked for DTC's with code reader. No active or pending codes.
The other things I think could be the cause based on internet research:
1. Accelerator Pedal Position (APP) sensor
2. Throttle Position Sensor (TPS)
3. PCM
4. O2 sensor
The problem is that all of those things tend to set a DTC from what I've read. I still think the fuel pump us going bad and the pressure was fine because the problem is intermittent. I just don't want to spend the $$ on a new pump to find out it was something else.
Tomorrow, I will have access to a scanner that can log 10 seconds of data from the computers while driving. I think that might shed some light if I can get the problem to happen when recording. I'm not familiar with fuel trims and the lot.
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My 2011 stick shift no air Accent has a hesitation or stumble on light acceleration that comes and goes. It may not occur for weeks then re-occurs. It is hard to reproduce intentionally. It never occurs in cruise. The CEL is not on. Most often occurs at 1400 to 1500 rpm with slight acceleration or a slight increase in load as coming to a slight hill. I tried injector cleaner a few times and changed air filter. It seemed more reloaded to induction airflow so I changed the MAP sensor. I understand the 2011 Accent does not have a MAF sensor. It is still occurring. It is fine in steady cruise as well as in hard acceleration. I am wondering if it is a TPS sensor problem. It has 60,000 miles and otherwise runs fine.
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I own a 2002 Pontiac Montana van with 36,000 original miles. The past year it started making a loud whining noise that seems to come from the rear of the vehicle. It seems to be worse in summer than in winter. It iis really loud when turning into a parking lot or when turning sharply to go thru a drive thru at a restaurant. I have taken it to several mechanics and also to a dealership, and no one seems to be able to find the problem.
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