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Old 04-18-2018, 12:42 AM   #1
Packrat1
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2001 SW2
Default Reverse slam?......and other issues

Ok, so for the past few days my sw2 has been acting weird. First, the S.e.s. light comes on, scanner showed a po410 code. Light went off the next day. 700 miles since then and still off. Next the motor mount bolts shook loose. Cleaned the bolt, sadded blue treadlock and reassembled. Today on my way home from work I noticed a somewhat rough engagement of reverse gear. Not sure if this is considered as a symptom of reverse slam or not, but it's appears to shutter in drive too. When it shifts it acts like it's going into neutral for a split second, then goes to the next gear. No ses light currently. Problem is intermittent. Was considering wolfmans cure for reverse slam using "hydra trans tune" Any thoughts? Hope the issue isn't the input shaft nut.

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Old 04-18-2018, 07:04 AM   #2
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Default Re: Reverse slam?......and other issues

Sure, that cure process solves issues, but I would ask when was the last time the trans fluid was changed and a new spin on filter done?

It should be changed out at least every 30,000 miles, using ONLY Dexron III compatible fluid.

Secondly, what kind of heavy vibration loosens a TAM bolt/nut?
Sounds like you need to look at replacing the transmission TAM and the dogbone mounts also.

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Old 04-18-2018, 09:38 AM   #3
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Default Re: Reverse slam?......and other issues

Transmission fluid level should be checked.

A new filter and new fluid should be changed, if the car has been driven more than 30,000-miles or has gone more than 2-3 years since it was last changed.

The alternator output should be tested, to confirm that the electrical supply to the transmission, is at 14.2-14.4v coming from the battery. Anything below about 14.0v will cause shifting issues.

Symptoms of the input shaft nut will be a P0732, reverse slam/no reverse, and slamming gears on upshifting in drive.

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Old 04-18-2018, 02:53 PM   #4
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Default Re: Reverse slam?......and other issues

Quote:
Originally Posted by Packrat1 View Post
Ok, so for the past few days my sw2 has been acting weird. First, the S.e.s. light comes on, scanner showed a po410 code. Light went off the next day. 700 miles since then and still off. Next the motor mount bolts shook loose. Cleaned the bolt, sadded blue treadlock and reassembled. Today on my way home from work I noticed a somewhat rough engagement of reverse gear. Not sure if this is considered as a symptom of reverse slam or not, but it's appears to shutter in drive too. When it shifts it acts like it's going into neutral for a split second, then goes to the next gear. No ses light currently. Problem is intermittent. Was considering wolfmans cure for reverse slam using "hydra trans tune" Any thoughts? Hope the issue isn't the input shaft nut.
Quote:
Originally Posted by toggenburg View Post
Sure, that cure process solves issues, but I would ask when was the last time the trans fluid was changed and a new spin on filter done?

It should be changed out at least every 30,000 miles, using ONLY Dexron III compatible fluid.

Secondly, what kind of heavy vibration loosens a TAM bolt/nut?
Sounds like you need to look at replacing the transmission TAM and the dogbone mounts also.
not sure when it was last changed, but is nice and pink. Bought the car about 2 years ago with 110k on the clock. At 130k I changed the filter while looking for a very slow trans leak. Currently sitting at 148k. Guess it's due despite being clean and highway driven. It "hydra trans tune" a good product to use? How much trans fluid for a drain and fill? So far, ive replaced the trans temp sensor and added a filter magnet.

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Old 04-18-2018, 03:52 PM   #5
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Default Re: Reverse slam?......and other issues

Color is subjective, but should be RED, not pink.
Not familiar with that additive, whenever I have done the Wolfmans' reverse cure (on several makes of cars and pickup trucks), I have added Lucas Trans Fix from Walmart ~$11.

First off, I would ditch any magnet, depending on who manufactured the trans filter you are using, it may block those drainage holes in the top of the filter.
Ditch IT and never put one back in, especially since you are having issues.

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Old 04-18-2018, 08:27 PM   #6
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Default Re: Reverse slam?......and other issues

Quote:
Originally Posted by toggenburg View Post
Color is subjective, but should be RED, not pink.
Not familiar with that additive, whenever I have done the Wolfmans' reverse cure (on several makes of cars and pickup trucks), I have added Lucas Trans Fix from Walmart ~$11.

First off, I would ditch any magnet, depending on who manufactured the trans filter you are using, it may block those drainage holes in the top of the filter.
Ditch IT and never put one back in, especially since you are having issues.
I thought Lucas was thick stuff. Like cake batter thick. I know it helped my mother's '01 Toyota Sienna as it started to slip about every 25k miles. Works good for a slipping trans. Filter is a PowerTorque FK243. Magnet was on this side of the filter. How about a magnet on the top of the trans? Probably not much oil being slung up top, but I just feel better knowing there's a magnet grabbing some of the metal out of the oil. Trans shifted normally this morning. Started acting up again couple hours later.

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Old 04-20-2018, 11:31 PM   #7
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Default Re: Reverse slam?......and other issues

The slamming got worse last night. It's doing it forward and reverse. Limped it home 120 miles. 1-2, 2-3,3-4 shift all feel like I'm hitting a pothole. Guessing the input shaft nut is loose. Question, what causes it to get loose?

...
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Old 04-21-2018, 06:00 AM   #8
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2001 SL1
Default Re: Reverse slam?......and other issues

Abusing the trans by jackrabbit starts like trying to 'patch out', and not keeping up with necessary trans fluid changes. The reverse slam is a symptom and if ignored long enough over time....
How many miles on it and how long have you owned it?

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Old 04-21-2018, 01:00 PM   #9
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Default Re: Reverse slam?......and other issues

Slam on all shifts makes me suspect the LP circuit/solenoid is bad. Check the fuse, then check the coil resistance (both easy to do). If nothing is obviously wrong with those, then use a gauge to check LP and verify if LP "stuck high" is the problem

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Old 04-21-2018, 01:15 PM   #10
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Default Re: Reverse slam?......and other issues

^^ Check this. If fuse in UHJB is good, the LP solenoid is suspect. Check YouTube for video on how to test resistance.

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Old 04-29-2018, 12:29 AM   #11
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Default Re: Reverse slam?......and other issues

Quote:
Originally Posted by billr View Post
Slam on all shifts makes me suspect the LP circuit/solenoid is bad. Check the fuse, then check the coil resistance (both easy to do). If nothing is obviously wrong with those, then use a gauge to check LP and verify if LP "stuck high" is the problem
LP as in line pressure? Which circuit is this fuse in?

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Old 04-29-2018, 12:33 AM   #12
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Default Re: Reverse slam?......and other issues

Quote:
Originally Posted by Cheyne View Post
^^ Check this. If fuse in UHJB is good, the LP solenoid is suspect. Check YouTube for video on how to test resistance.
ok. Will look for video.

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Old 04-29-2018, 09:35 AM   #13
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Default Re: Reverse slam?......and other issues

Quote:
Originally Posted by Packrat1 View Post
The slamming got worse last night. It's doing it forward and reverse. Limped it home 120 miles. 1-2, 2-3,3-4 shift all feel like I'm hitting a pothole. Guessing the input shaft nut is loose. Question, what causes it to get loose?
The reverse slam causes the input shaft nut to loosen. It also causes you to lose reverse and generates a P0732 code for "Second Gear Incorrect Ratio/No Second Gear".

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Old 04-29-2018, 03:00 PM   #14
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Default Re: Reverse slam?......and other issues

Yes, "LP" is line pressure. In the gen1 that fuse is labeled "TRS LP", I suspect your year is similar.

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Old 08-11-2018, 10:01 PM   #15
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Default Re: Reverse slam?......and other issues

Update: replaced valve body. The slam seems to be gone. Shifts a tad firm, but not harsh. Only drove about a 1/2 mile. Hope there nothing to worry about. Also SES light came on. Shows a code po037. Seems like an odd coincidence to show up now, but will pick up a o2 sensor in the morning.

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Old 08-12-2018, 12:27 AM   #16
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Default Re: Reverse slam?......and other issues

You will need to drive it a while for the PCM to re-learn the shift parameters. There is a procedure to do this re-learn quickly, but just driving for a while will do it. Just 5-10 miles should be enough, but you will have to be going at varying speeds that require shifting into all the gears several times.

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Old 08-15-2018, 05:26 PM   #17
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Default Re: Reverse slam?......and other issues

Ok. Drove about 15 miles today. Seems to be back to normal, but check engine light persists. Replaced downstream o2 sensor and cleared the code, but came back right away. What else would trigger a po037?

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Old 08-15-2018, 05:38 PM   #18
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Default Re: Reverse slam?......and other issues

I have no experience with that heater code, however; back in 2009 while addressing that code on a '98, OldNuc said,(P0037 Heater Circuit Low Voltage)

http://www.saturnfans.com/forums/sho...d.php?t=136349

"You can try disconnecting and reconnecting the plug. Its located on the rear cross tube of the cradle, right behind the steering rack. There is a connector lock pin in it that has to come out before it will unplug."

Last edited by toggenburg; 08-15-2018 at 05:45 PM..

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