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 Error Code P1870

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kennyj4
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Joined : 2007-08-16
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PostSubject: Error Code P1870   Thu Nov 29, 2007 3:29 pm

I've had an 1870 code for quite some time. The car feels like it has no power in 1st gear and the exhaust is heavier than normal. After driving I can smell a burnt smell.

Any thoughts? I've changed teh transmission fluid already and used seafoam to clean it also.
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oldsman105
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Name : Enrique Patino
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PostSubject: Re: Error Code P1870   Thu Nov 29, 2007 3:49 pm

P1870 Trouble Code; "Transmission Componet Slippage"

What year is the Riviera?

I think that trans is on its last legs
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kennyj4
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PostSubject: Re: Error Code P1870   Thu Nov 29, 2007 5:24 pm

Its a '96 with 123,000.

Other than having no power when I first accelerate it runs fine.
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Mr.Riviera
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Name : Matthew
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PostSubject: Re: Error Code P1870   Thu Nov 29, 2007 5:29 pm

check for a vac leak around the lines that go to the front of the tranny.
how does the fluid look? level?

_________________
1996 with 244k miles, L32 4" FWI -> ported N* -> Ported Gen V w/3.0" Pulley, Stage 3 Phenolic I/C, ZZP FMHE, 1.84 RR, Headers and 3" pipe to mufflers, F-body brakes, and lowered on Eibachs.
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kennyj4
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PostSubject: Re: Error Code P1870   Fri Nov 30, 2007 12:00 pm

Fluid and level are fine
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Jason
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Name : Jason
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PostSubject: Re: Error Code P1870   Fri Nov 30, 2007 1:19 pm

on the 1996 4L60e, to fix the 1870 code we stake the TCC regulated apply valve in the full-open position, which eliminates the PWM function. With the pwm function locked down, it then functions like a regular lockup. You don't need to reflash the PCM.

Don't know about the 4T60... I suppose it would be similar but you may want to check it out. THe 4L60e transgo shift kit addresses the issue. I don't know if the 4T60e transgo kit addresses it, butit includes the PWM valve, lock-up regulator valve & bushings.
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Riviera96
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Joined : 2007-01-21
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PostSubject: Re: Error Code P1870   Sat Dec 01, 2007 9:46 am

With a 123000 miles you might as well spend your time shopping around for a rebuild transmisson.
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