Question about 1985 Pontiac Firebird

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85 pontiac firebird 5L engine automatic trans trans willnot shift until it is totally warmed then shifts normal

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  • Clint Smock
    Clint Smock Jul 10, 2010

    It just holds 1st gear? New fluid and filter?

  • folyerhrt Jul 10, 2010

    yes holds first,yes filter,fluid,will not shift until it has warmed about 1-2 miles then shifts normal

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  • Master
  • 4,669 Answers

Sounds like you might have a stuck governor valve. It is located on the drivers side near the rear, under a round steel cover about 3 inches in diameter.

Posted on Jul 11, 2010

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1997 toyota coroola dx automatic 214Kmiles. Gears not shifting correctly until car warms up.


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One year I went out and I had the same problem.. If I pushed REALLY hard to the right it would go over - and then smooth as butter it would go UP into reverse.. Driving the car & warming up the trans did little..

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Like the skip-shift solenoid works - I figured it was the Reverse Solenoid that had frozen up..

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Rebuild the trans

What have you been waiting on !
Why use a vehicle that won't shift properly?

Feb 22, 2014 | Cars & Trucks

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1 Answer

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The vacume hose on the vacume modulater on the trans mission is nt hooked to full engine vacume or the engine isn't making vacume.The governer will make the trans shift to second anyway at redline but it's preety hard on an old car to redline it just to find out/ It's possible that youv'e got the shift detent cable that hooks to the carb set too tight or it's stuck as if it's floored. with the cable disconnected it should shift out al the way real early as long as thirs vacume on the modulater. Gas mileage freaks that drive around slowly unhook th shift cale so the trans shifts into high gear real early. Not much for passing and acceleration but they get a little bit better gas mileage.

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Most likely is a shift silenoid. You can go to autozone and have them read the codes for you. Then you will know for sure.

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1 Answer

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Sounds to me like the valve body is sticking causing the low/reverse clutch pack to stick. Might try a fluid/filter change. If all else fails, at least the 700r4 is a cheap/easy transmission to rebuild.

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1 Answer

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A reason for hard shifting could be a problem with many things with various degrees of seriousness. It could be your ATF( automatic transmission fluid) is low or broken down and old. This would cause the hardness and the reason for stop and go traffic effecting it. Another possibility is your transmission is just shot, and the timing gears inside are worn and not properly shifting at the correct RPM causing a **** during shifting.

Some possibilties, not all!

~Lucas

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its the filter. changing the filter will fix this malfunction.

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Feb 01, 2009 | 1989 Pontiac Firebird

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