Question about 2007 Pontiac Montana

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Adjustment for rpm - 2007 montana

Rpm below 1k but need a bit higher to get heat.

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Please don\'t try to adjust your rpms. Its computer controled and it just won\'t be good at all. Not to mention hard for your drive line when you shift into gears.

Just fix your heat, its the best option.

Posted on Jan 10, 2013

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Posted on Jan 02, 2017

wracefans24
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SOURCE: no heat on idle approx 700 rpm but lots of heat

When the engine is cold,remove the radiator cap and make sure it is full,check fluid level in reserve tank too.

Posted on Dec 20, 2009

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2000 Pontiac Montana that starts and runs fine for 7-12 min then looses throttle power. Sputters at 1k-2k for 10-15 min then runs fine for 7-15 min then runs even worse, wills sputter at 750+ rpm.


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1 Answer

2007 montana - low rpm - under 1k - no heat.


Make sure you radiator is full. There are 2 bleeder screws for that engine because its really hard to get all the air out. If its low or has too much air in it, you won't have any heat at low rpms.

Second thing is that your heater core may be a little stopped up and needs flushed, or replaced.

Thirdly, i've noticed that the Montanas don't put out a lot of heat if you're setting. But you should have some heat to keep you warm. No heat is no good.

Jan 09, 2013 | 2007 Pontiac Montana

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Could not agree with you more - was thinking that it was a circulation problem with coolant when you mentioned your suspicions.

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No heat at idle. good heat when rpm increased. why?


It sounds to me like your coolant level is low. By increasing the engine RPM you speed up the rate of flow by the water pump and this will send some coolant to the heater core giving you heat. Top up the overflow bottle and this should help. you may have to repeat this more than once to get it properly full. Hope this helps.

Dec 13, 2011 | 2007 Pontiac Montana

1 Answer

Message SHOW check the system when i start the car


Hi
Two reasons for this ...
1. the fuel pump is over pumping
2. one of the jets in the Multi Point Fuel injection system is jammed and constantly pumping gas into the cylinder.
Get a good injection cleaner fuel addative... this will solve your problem... though it will take a few days of driving before the RPM settles down below 1K RPM.
Regards
Berry

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1 Answer

I need to set the RPM a bit higher can it be done manually or is it set electronically.


Check the parts on the airhorn behind all the airfilter ductwork. On one side you will have a TPS switch. It has 2 screws and 1 electric plug. If you take it off for a second you can see if there is a elongnated slot for 1 screw. This will raise the RPM slightly by adjusting the TPS in that elongnated slot.

On the other side of the airhorn there is a stubborn set screw. It butts up to the throttle cable. This will adjust the RPM beyond the range of the TPS base idle. So to answer your inquiry the TPS can be manually adjusted to electrically raise RPM, the stubborn set screw can manually be adjusted to raise RPM.

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Hi,

The engine RPM dropping from 1K to 800 when the A/C is turned on would be because the engine is now powering another load, the A/C compressor. However, most designs incorporate a "compensator" that increase the idle back to 1K. This is accomplished with a solenoid coupled to the throttle opening. Electrically, this solenoid is powered in parallel to the A/C compressor. Once energized, the solenoid would open the throttle a little bit more. If your engine has one, then it could either be defective, not electrically connected to the compressor or the reach of the solenoid is not adjusted to push the throttle a little bit more.

Of course, there would be instances where the solenoid is simply installed.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

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