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Old 02-27-2016, 02:00 PM   #1
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2006 pontiac montana 3.9. will a bad tps cause low speed stalling? if I am on and off the gas peddle in slow speed conditions such as city driving, heavy slow traffic or long winding on ramps she has a tendency tp stall. was told to look for a idle control sensor but dont see one. thanks
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Old 02-27-2016, 04:36 PM   #2
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I think this is fly by wire(TAC)......any codes?
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Old 02-27-2016, 05:06 PM   #3
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It'* in the tranny shop for a rebuild. will scan it when i get it back. will a code come up for something like that?
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Old 02-28-2016, 10:34 PM   #4
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Yes......what I mean by fly by wire is, there is no accelerator cable.......the throttle plate is moved by an electrical motor...
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Old 02-29-2016, 08:28 PM   #5
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yes. I knew what you meant. Just trying to get some research done while I'm thinking about it. did I mention it has 342,000 on it?
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Old 03-01-2016, 12:15 AM   #6
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With a TAC system, there is no IAC valve and no separate TPS......it'* all one throttle body unit.....

What you can try is this.....

With a rag, wet with carb cleaner, clean the throttle plate AND it mating bore.....then disconnect the battery(neg first), and hold/clamp together the two battery cables for a couple minutes(this resets all modules)....reattach the battery cables(pos first)......then make sure the tube going from the snorkel, in front of the throttle body, to the back valve cover, is intact.....
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Old 03-11-2016, 07:34 PM   #7
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update! got the montana back on tuesday. my stalling problem must have been tranny related. it has not come close to stalling ounce. Iknow there are a lot of sensors on modern cars, one of them on the tranny must have been sending a bad signal or something. I cant believe how much better it runs. 750 rpm at idle. before I would take my foot off the throttle and it would dip below that and stall some times. crisis averted. till next time thanks tech.
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Old 03-11-2016, 09:49 PM   #8
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750 is a about 100 RPM higher than normal for a gas engine.
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