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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 08-17-2009, 01:46 PM   #11
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Okay, Tequila Man. Care to guess on how much time it has left? That'll probably make the decision on whether I make the down payment on a used one today, or wait a few months for you to be ready.

I've been getting this check engine code (again, P1870) for over a year now. It'* been very intermittent. Since Bill and I changed the crank sensor a few weeks back, the car'* been running beautifully. (You two would get along great.)

Now, starting Friday, I've noticed a periodic shudder when the car is cruising in third or fourth gear. You'll feel and hear a gentle vibration, like unbalanced tires, for a second or two. Other than that, it'* running great. No slips, no odd shifting, no CE lights as of late, no excessively dark or burnt fluid. It doesn't drive like a dying transmission.
2007 Pontiac G5
1999 Pontiac Grand Prix GT - Stock engine ate transmission.
1997 Pontiac Bonneville SE - Cammed engine ate transmission.
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Old 08-17-2009, 10:19 PM   #12
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Originally Posted by SignOfZeta View Post
Well, I've been getting that elusive P1870 code for quite some time. The transmission fluid'* turned a lovely shade of red, albeit with a slight burnt smell. Aside from that, when you're on the road, you can't even tell that anything'* wrong with it. It shifts smoothly and when it should, and I've never been locked out of a gear.

I decided to start shopping around for repairing the slipping torque converter clutch. One transmission shop'* mechanic said that he'* seen this code before, and suggested a complete rebuild: all new parts (minus the case), with a two-year/24,000 mile warranty, for $1800 (before tax, 6%).

I've barely begun to shop around, but what do you guys think I should do? The car has no major problems aside from that. I'd rather get this fixed before I end up stranded somewhere and forced to cater to the closest mechanic'* whim.
Have a mechanic drive your car with the computer hooked up to it. You can monitor all of the information to determine how much slip there is and so on. He should be able to determine whether it'* your transmission or the TCC. I wouldn't leave it in the hands of a random mechanic with an $1800 quote without trying to narrow it down more by taking it for a test drive w/the computer hooked up. IIRC correctly, the computer will throw out a P1870 with a slip of about 50RPM. Mine was 200RPM when I got it in. My TCC replacement, bushings, seals, and a little bit more ran about $950.

Your problem seems to be exactly the same as mine was a few weeks ago, as a matter of fact, in every single way. When the light originally kicked, the car had shifted from 4th to 3rd while decelerating. Given your problem is between 3rd and 4th, sounds like a failure to lockup, same as mine. Inside my TCC, there was charcoal caked onto a couple of the gears, another one had bad grooves. But I'd only driven my car for another 45 miles after the light kicked on, not an entire year.

Last edited by Ironduke; 08-17-2009 at 10:35 PM.
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