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Old 06-08-2014, 07:23 PM   #1
Jerry52992
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Mad Reverse issue

I have a 2001 SL1, sometimes (but not always) especially when it's just being started after sitting all night, when I put it in reverse it does nothing for severel seconds and then SLAMS into reverse, shaking the whole car. What could cause this issue?

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Old 06-09-2014, 03:24 AM   #2
Razzle Dazzle
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1995 SC2
Default Re: Reverse issue

Reverse slam is indicative of needing new transmission electronics, usually.

The repair procedure my roommate has taken with the countless Saturns he's acquired for cheap because of reverse slam is valve body. Alternative cause one a 2002 SL2 once was a dying PCM. Valve body is a fairly easy job because it's on the top end of the transmission, or wait for someone to come along and tell you how to properly test it.

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Old 06-09-2014, 09:17 AM   #3
SLfun
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Default Re: Reverse issue

Step 1, check your trans fluid level....

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Old 06-09-2014, 10:51 AM   #4
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2001 SL1
Default Re: Reverse issue

When was the last time the transmission fluid and filter were changed?
Reverse slam.
Step 2.
Drain out all the transmission fluid and use an new tranny filter. Refill using only Dexron III fluid. Next, start the car, put into reverse 'gear' against an immovable object like a tree, stump, brick wall....or (do it safely tho!) and pull up on the emergency brake. Let the car idle in reverse for like 30 minutes. You will effectively flush out the torque converter and mix in new fluids up into the TC and (my experience agrees with this) and eliminate the dreaded reverse slam before damage to the tranny can occur.....unless the slamming has gone on for a long time, or like someone is heavy on the gas pedal WHILE going into reverse .... then there is real mechanical trouble brewing!

This whole cure is the result of WOLFMAN's genius.

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Old 06-09-2014, 02:49 PM   #5
Razzle Dazzle
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1995 SC2
Default Re: Reverse issue

Also check your transmission temperature sensor. It's the same as the ECTS, in fact, if it's never been changed, go to a parts store, buy an ECTS, and replace the TTS with it.

It's the same sensor with the same failure habit.

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Old 06-11-2014, 07:43 AM   #6
tx3nc
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Default Re: Reverse issue

Neglecting fluid changes can cause varnish buildup in the valve body which can cause this problem. If the Wolfman's cure doesn't fix it, then the next step is to replace the valve body. About $100 on Ebay. I'd get one that has had the sleeve modification done to it. If that doesn't fix it, then the nuts on the transmission shaft's need to be replaced. Not a technically difficult job but it can be intimidating.

I did the repairs in that order. The valve body fixed the reverse slam issue then about a year later it started vibrating in the 1->2 shift. Replacing the nuts fixed that.

Search the forums for this issue. It is a common problem but doesn't need to be expensive to fix if you have some mechanical ability.

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Old 06-11-2014, 08:57 AM   #7
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Default Re: Reverse issue

Quote:
Originally Posted by tx3nc View Post
Neglecting fluid changes can cause varnish buildup in the valve body which can cause this problem. If the Wolfman's cure doesn't fix it, then the next step is to replace the valve body. About $100 on Ebay. I'd get one that has had the sleeve modification done to it. If that doesn't fix it, then the nuts on the transmission shaft's need to be replaced. Not a technically difficult job but it can be intimidating.

I did the repairs in that order. The valve body fixed the reverse slam issue then about a year later it started vibrating in the 1->2 shift. Replacing the nuts fixed that.

Search the forums for this issue. It is a common problem but doesn't need to be expensive to fix if you have some mechanical ability.
If you ever buy a $100 valve body, especially on ebay, and expect it to do something is like throwing a round into a shotgun chamber and thinking it won't go off when you pull the trigger.

The parts alone for a valve body rebuild are $100. If you buy a $100 valve body you just paid triple for a junkyard core.

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Old 06-11-2014, 08:31 PM   #8
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Default Re: Reverse issue

Quote:
Originally Posted by Special Forces View Post
If you ever buy a $100 valve body, especially on ebay, and expect it to do something is like throwing a round into a shotgun chamber and thinking it won't go off when you pull the trigger.

The parts alone for a valve body rebuild are $100. If you buy a $100 valve body you just paid triple for a junkyard core.
What do you charge for a valve body?

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Old 06-14-2014, 12:05 AM   #9
D Spear
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1998 SC2
Default Re: Reverse issue

you need to change out your valve body, your input and output nuts might be loose. I just replaced mine today, got it off ebay for $200 and it was resleeved. shiftritetransmissions located south of Chicago. it was very easy.

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