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Old 05-31-2007, 05:21 PM   #1
92sl jeff
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Question Automatic Transmission, engine rev high...

Hi Marino and all,
This was post 2 months ago, so i couldn't post reply;

Quote:
Originally Posted by Marino20 View Post
Hello,

If the physical outside temperature of the air is cold, then the car seems to start in 2nd or 3rd gear, and is slow to accelerate (because it's in the wrong gear - think of a manual transmission trying to start at a stoplight in 3rd). It will stay that way until the car (or air) warms up, then it will be fine the rest of the day, but if it is cold the next morning, it starts again. However, if we do not have a cool night (60+), it starts and runs perfectly. Another time, we decided to test the hypothesis by taking a weekend vacation at the beach, and while at the warm humid beach it also ran perfect. But returning to the mountain foothills caused it to be "temperature specific" again. Our mechanic has tested for fluid leaks and does not see one (and we do not have a leak on the driveway either).

I noticed the "reverse slam" fix, but wondered if anyone could figure out what is happening with this, and why it could be temperature sensitive (to cold???).

Thanks for your time!

Did you fix the problem? i got the same symptoms with my Sunfire 99 2.4l AT when it's a little cold in the morning. The engine rev high and the car is not moving much. It feels like an old clutch with no grip on a Manual Transmission. It's much worse when i'm turning (when the power steering is on). And after 5-10 minutes everything is back to normal.
Anybody, any help on this please?
...
Jeff

Saturn SL 1992 1.9l sohc ST
Sunfire SE 1999 2.4l AT4
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Old 06-01-2007, 03:13 PM   #2
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Default Re: Automatic Transmission, engine rev high...

Anyone who might know what could be wrong?
please!
...
Jeff

Saturn SL 1992 1.9l sohc ST
Sunfire SE 1999 2.4l AT4
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Old 06-01-2007, 03:27 PM   #3
yazhere
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Default Re: Automatic Transmission, engine rev high...

There are many threads about the Saturn automatic transmission and its shifting. The recommendations that are given first to check before doing is getting your alternator checked to ensure it is providing the power to send to the transmission's shifting solenoids to energize at the appropriate times. It may be as much as the serpentine belt is loose from a failing tensioner therefore not turning the alternator enough to provide that power.

The Reader's Digest version is to get the charging system checked and look at the quality of the connections from there to the transmission.
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Old 06-01-2007, 05:31 PM   #4
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Default Re: Automatic Transmission, engine rev high...

thank you for the info!
...
Jeff

Saturn SL 1992 1.9l sohc ST
Sunfire SE 1999 2.4l AT4
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Old 06-01-2007, 10:56 PM   #5
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Default Re: Automatic Transmission, engine rev high...

Quote:
Originally Posted by 92sl jeff View Post
Anyone who might know what could be wrong?
please!
My bet is on the transmission temperature sensor (a $16 item). It's the same type as the ECTS and IAT sensors, and is prone to failure to where it registers extremely cold temperatures until it warms up to slightly above normal operating temperature. That will put your transmission in safe mode and it will start in 3rd gear.

It's sitting right above the transmission oil filter and has two wires attached to it. Replace that, and I'm almost 100% sure it will fix the problem. They'll give you the NEW TYPE at the dealership that doesn't go bad with age, the OLD TYPE always fails after about 60,000 miles. Get one for your engine too (ECTS - Engine Coolant Temp Sensor). They are the same things. The IAT should be fine because it's not exposed to any fluids or extreme temperatures.
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Old 07-06-2007, 02:07 PM   #6
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Default Re: Automatic Transmission, engine rev high...

hi everybody!
Just for the records, turns out the problem was the fuel pump.
We just installed a new one and the car seems the work fine now.
Thank you guys.
...
Jeff

Saturn SL 1992 1.9l sohc ST
Sunfire SE 1999 2.4l AT4
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