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Old 09-16-2018, 03:58 PM   #1
gveinot
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2000 SL2
2000 SL2
Default S Series Automatic pulling forward at idle

A while back I posted an issue in which our 2000 SL2 automatic ( now 450,000 km ) was creeping forward at idle while in drive, 2nd, or reverse. The issue was worse when the engine was cold on first start and once warmed up the issue was less noticeable. At cold start the car would literally go 20km/h and shift into second gear. You had to hold quite a bit of pressure on the brake to keep it stopped. The issue was never idle speed, that was normal. The cause was the TAAT valve body. I swapped it today and now everything is normal. This was an interesting one as this valve body shifted perfect and the fault I described would disappear once the engine was warmed up for more that 10 minutes. I'll post more details on the condition of the solenoids later in this thread. I hope this post helps someone else out down the road.

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Old 09-30-2018, 07:32 PM   #2
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2000 SL2
2000 SL2
Default Re: S Series Automatic pulling forward at idle

I took the removed valve body apart that caused that cold start "pulling away at idle" issue and discovered something very interesting. All the solenoids except the Line Pressure one are coming apart, you can wiggle the bottom part of the solenoid and it will move about 1/16 on an inch. Only the Line Pressure Solenoid is tight. All 5 have the same electrical resistance between 4.5 - 5 ohms. This valve body has about 200,000 km on it. It was a new one I bought in 2010-2011, well the Saturn dealer said it was a new one. This one never had a reverse slam issue, I did replace the line pressure solenoid and the TCC at different times in the past 5 years. So I am thinking with 2nd, 3rd, and 4th gear solenoids not tight I suspect the valve body was not able to create enough pressure when cold hence the pulling away at idle in both forward and reverse. I hope this helps someone else. I remember seeing a few other posts on this weird issue but the OP never commented on a fix or if they just gave up.

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