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Pontiac Montana Engine Problems



  • hi! i've had 2000 montana the problem is when i'm driving it all the guages shuts off and when i move the steering wheels it goes back! and my fuel gauge is unstable int goes up and down and most of the time is always full even though it's not! need help!
  • kenniekennie Posts: 38
    Re the fuel gauge... this is very common in montanas... mine has done it for 3 years and it's a 2000. Just use the odometer to indicate how many Kms you've gone and then fill up... the cost to fix just is not worth it unless you have warranty. I believe the "LOW FUEL" light is indiependant of the gauge problem so when it comes on you are definately low in the tank on fuel... this is the way mine works. You would have to have the fuel sending unit replaced and it is located in your gas tank very likely... they can test that is is failing by testing the wires.. if certain voltages are read they can tell it's gummed up. Cleaner can be poured in the gas tank to attempt to clean it but i'm not sure if it is worth of the risk of plugging something or running such cleaner through your engine if you don't absolutely have to.. the cleaner I think is called sea-foam I think. Cheers.
  • ray80ray80 Posts: 1,186
    Also for the fuel gauge (I believe its applicable for a 2000), it may be an issue with the c-305 connector.
  • kenniekennie Posts: 38
    What is the c-305 connector and what does it do??
  • ray80ray80 Posts: 1,186
    Its a pass-thru connection for wiring (from inside cabin to outside/underneath). It connects various wires for things in rear of vehicle(including connection to fuel pump/sensor). While its weatherproof on bottom (underneath) it is not inside cabin, spills/ various leaks inside can cause water intrusion and subsequent corrosion of wires. Google ' gm c305 connector' and you will find lots of stuff.
    The connector should be under carpet to the rear of drivers seat (you may be able to see exactly where by looking under vehicle for a bundle of wires that come out from cabin)
  • So what does it mean when your "service engine soon" light stays on? I am having a new issue with my van and it is staying on.
  • I was driving home and my van all of a sudden lost power and kinda sputtered. It almost felt like I was running out of gas. I knew that was not true since I just got gas. There was no loud bang or anything. So I pulled into the next driveway and my check engine light came on. So I turned the van off. I got out and checked the water and oil and everything was fine maybe 1/2 quart low on oil. Engine was not overheated and no leaking oil or anything. I turned my van on and there is a clicking noise coming from the engine and it has loss of power for sure. So I am going to have to have it towed. Does anyone have any idea? Has this happened to anyone? It is a 2003 Pontiac Montana with 115000 miles and has been taken care off well. so I am a little confused. I hope someone may have some answer? Thanks
  • spike99spike99 Posts: 239

    From your statement of "there is a clicking noise coming from the engine", your high miles van (for a 3.4L engine) could have anything from blown main bearings, to broken cam to blown pistons. It all depends on the exact sound of the "clicking" and its sounds location under its hood. Best is to get a certified mechanic to investigate and confirm what could be broken.

    Also... "Do trust your gut" as well. If your van has NO rust, its tranny is still good, its steering is still firm and overall, it's still a sound vehicle, then it might be worth fixing. Fix with new engine parts (on existing engine), or perhaps fix with a new re-built engine block. But if your vehicle is near its "end of life" and engine repair/replacement is too expensive, then simply "write her off". One of those "Humpy Dumpty fell off the wall" things....

    Hope this helps....

  • My wife just had the same problem happen to her 2003 Montana on the way home from work last week. :cry: We have 98,000 on the van and we have done all of the regular service to it. Now we are trying to figure out what to do? Does anyone have any recomendations? :confuse:
  • have your fuel filter checked, mine was almost completely clogged
  • You do not need to roll anything just test it by pulling one wire at a time and crank it you will know if there is spark there are two screws per pack replace bad one
  • kgb92kgb92 Posts: 2

    The vent fan for the interior has started to intermittently stop working, I was in a drive-thru line last week and it started then. No problems until this morning as I started going to work, it would stop I would turn it off, and after 10 minutes turn it back on. My engine has also been overheating so I do use this to help cool off the engine in traffic on the way home. I drive 70 miles to and from work daily, the way home is usually rather muggy and stop and go traffic. Any thoughts? I have to replace my A/C condenser again next week, I had the blower motor and water pump replaced last year, and the serpentine belt.
  • ray80ray80 Posts: 1,186
    I would guess (because it comes and goes) it may be an issue with HVAC cluster (loose conections maybe, you could try whacking it with your hand when it goes off to see if it starts again). For the overheating you might want to check coolant level in radiator as well as overflow bottle
  • kgb92kgb92 Posts: 2
    Thank you - I will try that this evening on the way home. I pretty much check the radiator and reservoir daily, this has been happening since last summer. I think I need to replace the intake manifold again or it might be as simple as the thermostat. I have bumped up my repair schedule to Monday - I just need to make sure I get home today, so I will be working late to make sure traffic is low.
  • I have an 03 montana. the temp guage never goes below half and as soon as i slow down it goes up to where the overheat light comes on. It doesnt sputter so i dont think its actually overheating though. could it be the temperature sensor maybe? help.....">
  • ray80ray80 Posts: 1,186
    First thing I would check is coolant level in both overflow bottle and radiater If you have been adding coolant on a regular basis there may be air in the system that might require bleeding after filling with coolant to maintain proper level.
  • armesarmes Posts: 32
    Engine may not sputter until you have blown the head gaskets. Do not use this as criteria as to weather it is over heating. I know this from experience with my 02. The temperature gage would go up and down like that even after the air was burped from the system. Then, wham the head gaskets blew and that is when the engine started to stumble. :sick:
  • The gas gauge going up and down is the fuel sending unit in the gas tank. It's a $34. part on ebay, and is a moderate to easy fix.
  • pajar0913pajar0913 Omaha NebraskaPosts: 1
    I have a 2002 Pontiac Montana and just recently it started to overheat at stop lights or anytime the van is on and not moving. So today went out down town. And on the way home the van over heated so bad the red light on the dash come on and I could hardly get the van to go past 30mph. Any one have this problem before. Thanks. Read hope it's something simple. Please feel free to email me directly
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