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Old 05-15-2016, 08:26 AM   #1
birchmj
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Wrench Repeated replacement of TAAT Solenoid

I have a 2002 SL1 with a TAAT Automatic Transmission. I have had to replace a solenoid in the transmission now going on my third time. It will work for about one month and then burn out again. When it burns out (verified using an ohm tester), the car will no longer take off in first gear (starting in 2nd or 3rd). When I change the bad solenoid, it is all good for about another month.

I assume that I should be looking elsewhere for the true cause. Any ideas? What should I test or replace. I really appreciate any suggestions!

FYI...I have put on a need wiring connector to the transmission as the original was burnt. I have had to change the 10 amp fuse at the same time as the wiring connector because the fuse was also burnt. Both are good now.

Thanks

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Old 05-15-2016, 08:31 AM   #2
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Default Re: Repeated replacement of TAAT Solenoid

Connector tightness in the buss plate for the solenoid that contentiously fails. Finding a good buss plate is the best approach.

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Old 05-15-2016, 08:42 AM   #3
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Default Re: Repeated replacement of TAAT Solenoid

And where are you getting your Solenoids from?

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Old 05-15-2016, 09:19 AM   #4
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Default Re: Repeated replacement of TAAT Solenoid

@Chazberry: I bought the solenoids on ebay from usa.industries

If you have a suggested trusted supplier, I don't mind payer a higher price for the quality.

@OldNut: Thanks for the suggestion on the bus plate. Will a loose connection to the bus plate make the solenoid go bad? When I take out the solenoid, it indeed test bad out of the 4.5-6.0 ohm range without the bus plate connected. I can buy a new bus plate to make sure that isn't the problem.

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Old 05-15-2016, 10:47 AM   #5
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Default Re: Repeated replacement of TAAT Solenoid

Quote:
Originally Posted by birchmj View Post
@Chazberry: I bought the solenoids on ebay from usa.industries
I'm pretty sure any units you get on ebay are gonna be "used". I recently replaced my LP Solenoid with a "new" one I got from Amazon for about $50.

Are your "bad" Solenoids reading low resistance? That's an indication some windings have shorted. I don't see how any poor connections at the Harness Connector or the Bus Plate would cause that - unless you see some obvious over-heating at the Solenoid posts.

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Old 05-15-2016, 11:09 AM   #6
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Default Re: Repeated replacement of TAAT Solenoid

PS - I also did some contact pressure checking. See this fwiw . . .
http://www.saturnfans.com/forums/sho...7&postcount=10

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Old 05-15-2016, 01:36 PM   #7
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Default Re: Repeated replacement of TAAT Solenoid

Buss plate connections are well oiled. Funny things happen when you energize and deenergize a roll of wire through a less that 100% connection. The one you are interested in is the inductive effect of having that suddenly deenegized solenoid terminal voltage climb up to several thousand volts. This shorts turns as you asked about.

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Old 05-15-2016, 04:18 PM   #8
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Default Re: Repeated replacement of TAAT Solenoid

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Originally Posted by OldNuc View Post
Buss plate connections are well oiled. Funny things happen when you energize and deenergize a roll of wire through a less that 100% connection. The one you are interested in is the inductive effect of having that suddenly deenegized solenoid terminal voltage climb up to several thousand volts. This shorts turns as you asked about.
Ah - those deadly inductive spikes!

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Old 05-15-2016, 07:34 PM   #9
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Default Re: Repeated replacement of TAAT Solenoid

The not funny thing is those large wire wound resistive heating elements will produce enough of an inductive spike to fry the contacts in a temperature switch. engineering department was baffled. If I was failing solenoids I would be going after the buss plate if the top connector was not fried.

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