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Discussion Starter · #1 ·
Are there any usual symptoms for the imminent death of an autobox?

My gearbox has recently started getting confused at light throttle openings. At full charge it still seems OK, but in normal around town use it has started to not change cleanly, and sometimes changes gear not quite when I expect it to. Also, it's developed a metallic scraping sound at idle.

1994, 2.3 FPT, 98,400 miles. The gearbox fluid level is correct.
 

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Take it to the shop and have them listen for the matalic sound. If it is not comming from the trans itself have them preform further diagnostics.
Some things to look for
- Sticky govenor
- seal rings on the piston behind the governor
- missadjusted kick down cable
- week or broken springs itn the valve body
 

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Mine seems to do the same thing at slower speeds. It usually occurs when throttle position is constant. I have checked my levels as well and everything is ok in that regard. Will do some more checking and report back if I can find anything.
 

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i have noticed mine doing that ...and it doesnt want to change gears between 2-3k rpm... i just got oil changed and now i think i need a tranny fluid changed... plus it seems to lurch forward when i shift from neutral to drive... anyone have idea why... also where can i find the throttle body and whats the best way to clean it?...still having problems at first start trying to keep her idle above 500 rpm or so until she is warmed up then she goes up to about 900-1000 rpm. going to try to clean throttle body 1st before i take it in to have idle looked at
 

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Mine also has trouble with idle, only at the first minute or so, seems to be worse in reverse and full lock, sometimes it stalls. I cleaned the throttle body last summer, so I don't think it's that. To clean it, remove it by taking out the 3 screws holding it in place and clean with a degreaser spray.

Harry
 

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Originally posted by gundam_007:
[qb]i have noticed mine doing that ...and it doesnt want to change gears between 2-3k rpm... i just got oil changed and now i think i need a tranny fluid changed... plus it seems to lurch forward when i shift from neutral to drive... anyone have idea why... [/qb][/b]
Well I just found an old SI bulletin On the Pc of my boss. Which mentions replacing some springs In the gearbox. It seems that are some standard troubles like yours which could be repaired by doing this. It is an in car job. The cover where the dipstick goes in the box has to be removed and then its possible.
I haven't tried it yet. But my autobox seems to be bumping into the last gear. And found in this Si that is the same springs as wich cause your problem. I will let you now what differences it has made to my car after i did this.
 

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If you are replacing the two springs as per the SI, the springs cost prob. less than $20 US ,you will whant to replace the valve body cover gasket about $30 US, if the cable as well maybe $50 US. service trans at this time if needed, , fluid, filter, addjust bands.
 

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Discussion Starter · #12 ·
Well, after talking to various autobox specialists and getting the usual "bring it in and leave £1500 and we'll recondition it" answers, I was referred to another place that sounded more promising. The chap knew a lot about the particular Saab 'box, and suggested I take off the end cover plate as he said that sometimes one of the shaft end nuts comes loose, allowing things to move enough to scrape on the casing.

So, I dropped the fluid out, and saw plenty of evidence of aluminium shavings in the oil. I removed the filter, and saw aluminium shavings there too. So I removed the end plate, and saw........ ................................................................................
.................................................. ..........absolutely nothing out of order. Both nuts perfectly tight, everything nice and clean as far as the eye could see. So I put the end plate back on, filled up with new fluid, and will have to send it to the menders whilst I'm away soon.

It still makes the same whining noise, but at least I know there are fewer aluminium particles floating about in there.

This will be my second autobox repair in a year, and fourth gearbox in about two years. Is nature trying to tell me something?
 

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Discussion Starter · #13 ·
Well it's fixed now!

Apparently the drive plate (flywheel like device) gets distorted, putting unnatural loads on the torque converter and fluid pump. The fluid pump then gets upset.

So I have:

1) one new drive plate
2) one new torque converter
3) one new pump

but I do not have

1) £1040

Apparently all the guts of the 'box were in good order.
 

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Big bill Mark

My K reg autobox (104K miles) has a slight whine just on the 1-2 change and sometimes thinks about its change up into 4th if I'm accelerating hard (have to back off on the throttle for a second before it does it!).

Thats one reason why I'm thinking of selling it soon and getting something else as I don't want to shell out approx 50% of the value of the car for a single repair.

Steve
 
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