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YACT: stalling at idle

N

NiteWulf

Golden Member
3.0l v6 automatic
My brother hasn't seen any constant codition where this happens, but pretty much every time he drives his minivan wants to stall when he comes to a stop (foot off the gas). He cleaned off the throttle body because of a problem that it had before, but that didn't help.

We talked about it for a minute and the first thing I came up with was a faulty mass air flow sensor. He also has a hole in the exhaust, and from what I understand it's rather large, but I don't think that would affect anything (not enough back pressure?). Neither of us is a car guy so if this sounds way out of the ballpark that's why.

Started stalling ~2 weeks ago, so I don't think it has to do with the cold weather

What do you suggest we check?

Update #1: He ran the codes and that led him to buy a new thermostat. He hasn't put it in yet, but an update is an update, right?
 
If your car has an ISV (idle speed valve) check that. I know a lot of the imports have them. It keeps the a constant idle I believe 300-600 rpm. If it's faulty, the car might stall like that. Also check to see if the car has a CTS (coolant temp sensor). If faulty, the car will either run rough or will stall at idle. Another possible one would be an intake leak of some sort. Check all vacuum hoses for leaks. A lot of the times you can take some carb cleaner and spray them over the hoses one by one. If the idle changes or you see bubbles, that could be a sign. Also for the exhaust. That won't make a difference unless it's at the exhaust manifold. Also check the idle switch.
 
In addition to the things already mentioned, it could be a vacuum leak or TPS sensor.

The ISV valve Cdubneeddeal mentioned could also be called an IAC motor, which is a stepper motor that makes tiny adjustments to the throttle plates to compensate for external factors (air temp, humidity, and the like) to keep the idle at a nice, smooth, happy RPM. It's mounted on the throttle body. These often get gunked up and stick when they age (especially noticeable in the cold). This often doesn't require replacement - you may get away with just pulling the motor off, taking it apart, and giving it a good cleaning.

I'd check vacuum hoses first - all that soft rubber gets old, hard, and brittle with age, and often starts to disintegrate. It's cheap as hell to replace all of it, they sell it by the foot at auto parts stores. I'd do this regardless - it probably needs to be done anyway.

If that doesn't fix it, I'd check the IAC motor, and clean it really good.

If that doesn't work, I'd check the TPS sensor.

Good luck.
 
A faulty MAP sensor can do the same thing, though I am not 100% sure that the 3.0 ltr had a map sensor.
like thedarkwolf said check the codes by the method shown on allpar and report back.
 
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