Question about 2001 Pontiac Sunfire

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Engine and trans problem

Engine often stall when slowing to stop or ideling down, and trans shifts fast and hard

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Could be the torque converter is locking up when it should not be.
Pull the TCC fuse and try it.
or....unplug the electrical connector at the trans and try it.
Any improvement means the torque converter or its control may be the trouble.

Posted on Sep 10, 2009

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ok, this can be real easy.
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Transaxle clutch wont release when hot stalls engine


Replace the Torque Converter Solenoid in
the transaxle

What you have is like coming to a stop with
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The converter clutch is staying locked & your
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When you changed the ****** fluid was it brown? If so I regret to inform you, you may need a new transmission. The brown color is due to the clutches in the trans, wearing down over time. Does it shift hard when you drive it? If it does that is another sign the trans has gone out the window.

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Idels fine when driving it sometimes loses power and stalls if you rev the idel above 3000rpm it stops and runs fine till you stop or slow down the idel below 3000 rpm it shutters and...


If you don't have a check engine light, Start with the air and fuel filter, work your way up to a tune up. Clean the throttle body as best you can on the inside, behind the throttle plate/s

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1 Answer

Idels high shifts hard and that is like every other time started put in new ecm and still have the issue


Your describing a vacume leak or a mis adjusted throttle body. Does it ever idel down? What engine is in it Desiel? If it's gas the AIS motor might be sticking or is bad. Does it run and is the check engine light on? are all the fluilds correct level? coolant level low can make the coolant senser lie about the temperture of the motor to the ecm and it'll command a high idel. Once the idel motor goes as high as it can it might be shicking and you can remove it and wash it off with carb spray and while it's out with the wire connected turn the key on and off with it in your hand and spray it with cleaner till it moves smoothly. With it retracted install it and try again, any vacume leak will make it idel fast. The trans mission will shift hard if the vacume line to it is off and it's on the back of the intake manifold and it goes to a modulater on the side of the trans. it can be off there too.

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1 Answer

What causes the vehicle to idle down then back up only when stopped or in park?


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Problems accelerating


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Engine speed hunts on idle. Auto trans slow shift.


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