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2005 Pontiac Pursuit (G5) Transmission Slipping
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curlybandit
New User
Dec 8, 2012, 12:04 PM
Post #1 of 5
(6660 views)
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2005 Pontiac Pursuit (G5) Transmission Slipping
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Hi.
A few months ago, my brother's '05 Pursuit (G5 4-door) began to have some automatic transmission slipping. It has approximately 152,000km (~95,000 miles).
To give you an idea of what's happening, it's as if the car struggles to find the right gear typically between 1st-3rd. If the car is recently started and is still "cold", it struggles to get into the right gear. It has problems going up hills when "cold" and feels like it can't catch the right gear. When accelerating from a light at typical speeds, it can feel just fine and transition from gear to gear nicely, but sometimes it sticks in 1st too long, then slips and the revs spike and then it finds second gear. If you accelerate fast/hard either from a light or when attempting to pass like on the highway, it'll slip trying to downshift then spike the revs at the point it should change and sometimes go back into that gear or find the next.
At first he took it to his mechanic who performed a transmission service. This didn't help. He then picked up a transmission from a scrapper with low milage and replaced his original with this. This hasn't corrected the problem either which leads me to believe that it wasn't the transmission to begin with.
There's never been a CEL light or code thrown.
My suspicion is that it's an ECU problem. I've been told I can replace the ECU and have it re-programmed at a GM shop.
Can anyone offer some advice as to what they suspect is going on?
Thanks.
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curlybandit
New User
Dec 8, 2012, 12:46 PM
Post #2 of 5
(6627 views)
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Re: 2005 Pontiac Pursuit (G5) Transmission Slipping
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Someone on another forum suggested that it might be "hunting" for the right gear.
It doesn't feel like it's hunting. It feels like it's slipping. There isn't a transition between gears like you'd expect even when hunting. The transmission seams to "slip" out of the gear as if I put it into neutral and then the motor revs just like it were in neutral with the accelerator depressed. It then finds a gear - sometimes the same on it was in, sometimes the next gear.
The best way I can describe it is as if it were a manual transmission and I pressed the clutch in slightly while trying to accelerate.
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Discretesignals
Ultimate Carjunky
/ Moderator
Dec 8, 2012, 1:19 PM
Post #3 of 5
(6615 views)
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Re: 2005 Pontiac Pursuit (G5) Transmission Slipping
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This might be a technical problem that requires special equipment. The transmission uses a pressure control soleniod to control line pressure. Someone is going to have to do some diagnosing here. They'll have to monitor transmission line pressure, solenoid duty cycle, and maybe even have to scope some of the circuits to see what is going on. Have to make sure the transmission electrical is operating as it should when the problem is occurring.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Sidom
Veteran
/ Moderator
Dec 8, 2012, 2:21 PM
Post #4 of 5
(6602 views)
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Re: 2005 Pontiac Pursuit (G5) Transmission Slipping
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I have to agree with that.....think it's time to have someone look at it...
Comps aren't cheap and it would suck to spend even more money on this & have the same problem......It would be even worse after all this time & money to find out it was a bad ground or loose connector....
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curlybandit
New User
Dec 8, 2012, 4:12 PM
Post #5 of 5
(6593 views)
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Re: 2005 Pontiac Pursuit (G5) Transmission Slipping
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That seems to be the only reasonable step left.
Thanks for the input!
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