i bought a 96 mc and it was fin but alla sudden when i stopped it died after tryin a couple things i couldn't figure it out ended up being the person that ownded it previously snapped the serpentine and put a new one on with out taking off all th refuge that got wrapped in my harmonizer and wore out my 1st position camshaft sensor.. go figure well now i have a slight slip in my trans and auto zone is telling me it's a 4 wheel drive short circuit to battery (P1870) which isn't logical so i found out it's the same code for trans slippage nut it doesn't slip at each shift and rarely at the same shift twice in a row any idea for a fix to this, 'cause if it comes down to replacing the trans i'll upgade the engine and the trans and convert it to a manual any pointers for that?

 

Doing a quick rundown on the code posted this is often caused by a worn TCC valve.





A P1870 code means the transmission is seeing a slip condition. Sometimes it points to the TCC clutch not working properly. Sounds like the transmission needs to come out. See if you can get hold of a GM diagnostic chart for this code and it will make more sense to you.

CIRCUIT DESCRIPTION:
The Powertrain Control Module (PCM) monitors the Torque Converter Clutch (TCC) slip by calculating the difference between the engine speed and the transmission output shaft speed. When the PCM detects an excessive amount of slip when the TCC is engaged, then DTC P1870 sets. DTC P1870 is a type A DTC.

CONDITIONS FOR SETTING THE DTC:

* No Throttle Position (TP) DTCs P0122 or P0123
* No Vehicle Speed Sensor (VSS) DTC P0502
* No 1-2 solenoid performance DTC P0751
* No 1-2 solenoid electrical DTC P0753
* No 2-3 solenoid performance DTC P0756
* No 2-3 solenoid electrical DTC P0758
* No TCC Pulse Width Modulation (PWM) solenoid electrical DTC P1860
* No TCC enable solenoid electrical DTC P1864
* The engine speed is greater than 500 RPM for 5 seconds.
* Not in fuel shut off
* The throttle angle is 9.5-35%.
* The transmission is not in 1st gear.
* The transmission gear range is D4.
* The transmission fluid temperature is 20-130°C (68-266°F).
* The engine torque is 70-270N.m (50-200 ft lbs.).
* The Manifold Absolute Pressure (MAP) is 0-105 kPa (0-15 psi).
* The TCC is commanded ON and at maximum apply for 5 seconds.
* The TCC slip is greater than 200 RPM for 8 seconds.
* The above conditions must occur three times with the TCC commanded OFF between each occurrence.

ACTION TAKEN WHEN THE DTC SETS:

* The PCM inhibits TCC operation.
* The PCM inhibits 4th gear, if the transmission is in the hot mode.
* The PCM illuminates the Malfunction Indicator Lamp (MIL).

CONDITIONS FOR CLEARING THE MIL/DTC:

* The PCM turns OFF the MIL after three consecutive ignition cycles without a failure reported.
* A scan tool can clear the DTC from the PCM history. The PCM clears the DTC from the PCM history if the vehicle completes 40 warm-up cycles without a failure reported.
* The PCM cancels the DTC default actions when the fault no longer exists and the ignition is OFF long enough in order to power down the PCM.

DIAGNOSTIC AIDS:

* Ensure that the vehicle's final drive ratio matches the PCM's calibration.
* Ensure that the transmission will shift through all four gears with the gear select lever in the D4 range.

 

how would i check on some of these things to narrow it down a bit

 

Google it for the most part, but contact http://www.sonnax.com, apparently they have a TCC valve replacement kit to fix this problem or swing by a good trans shop and inquire about a TCC valve replacement, cost installed is around $250-$300..

 

thanks i gotta nutha ? so 96 mc's didn't come with manual or rear wheel drive or any thing over a 3.8 any sugestions for switch to manual, switch to rear wheel drive, or a larger engine than my 3.1?