Question about 1998 Chevrolet S-10 Pickup
I JUST INSTALLED AND WIRED A 1995 GM 5 LITER (305 c.i.) ALONG WITH ITS 4L60E, AND COMPUTER INTO A 1995 JEEP WRANGLER. THE TRANSFER CASE IS AN NP 207
I AM TOLD I NEED A SPEEDOMETER SENSOR WITH A PULSE RATE OF 40 ( LOOKED MY COMPUTER NUMBER ON A WEB SITE) THE SENSOR NEEDS TO MOUNT TO MY TRANSFER CASE.(ACCORDING TO THE TRANNY GUY) aND I NEED MY JEEP SPEEDO CABLE TO HOOK TO THE SENSOR SO MY SPEEDOMETER WILL WORK. i HAVE FOUND SEVERAL UNITS THAT CLAIM TO WORK, BUT THEY ARE INSTALLED TO THE ADAPTER THAT MARRIES THE TRANNY AND THE TRANSFER CASE. (TRANNY GUY SAYS IT WILL WORK IN 2 WHEEL DRIVE FINE , BUT WHEN YOU USE 4 WHEEEL DRIVE IT WILL CHANGE RATE OF OUT PUT AFTER TRANSMISSION. HELP..
SOURCE: 1999 Chevy 4x4 engaging
Check the solenoid at the front axel. This is a rather common prob. First check that power is at the axel, got power, clean and put it back. Please do not even look at the tranfer case! At worst you may need to replace the axel solenoid! Frankster016
Posted on Nov 22, 2008
The ECM or TCM may be the culprit, its also possible that a ground wire is no longer grounded or partially grounded giving you the erratic speedometer.
Posted on Dec 08, 2008
Very well could be taht the Computer is not recieving the Shift codes Correctly. Just for an Easy Solution, Remove the ECM Fuse from the Fuse panel for 2 or 3 Minutes to Reset the Computer and let me know what you get.
Posted on Dec 31, 2008
It's most likely the "four wheel drive actuator" This is located on the front differential housing. It's cylindrical shaped and has a large hex (about
1-1/4") and two wires coming out of it. Usually they short out and blow the fuse but, I've also seen where they just quit working and sometimes they just get slow to work. The "actuator" has a heating element in it and it warms up, some sort gas, causing it to expand thus engaging the front wheels. In cold weather it may take a minute or so for it to engage, so put in four wheel drive and wait for a bit and see what happens.
Posted on Jan 05, 2010
Diagnostic trouble code P1870 (Transmission Component Slippage) is a
General Motors-specific code whose set parameters are determined by
transmission type and engine size. The PCM monitors and compares engine
speed to vehicle speed after the converter clutch has been commanded ON
in either high gear or Overdrive. Should the expected rpm ratio exceed
predetermined parameters, DTC 1870 sets. And upon doing so, the PCM
elevates the transmission main line pressure and stops converter clutch
Once the vehicle has made it to a cruise state, the PCM then begins to monitor the vehicle's cruise ratio. If at some point the transmission begins to slip, P1870 sets and line pressure is elevated in an attempt to stop any further slippage and prevent further damage. This would explain why DTC 1870 Ls often accompanied by a complaint of a hard 1-2 up shift.
When this code sets, it could have any number of causes, ranging from the sump running low of fluid to a malfunctioning torque converter. Take a GM 4L60-E transmission, for example. When it's in Overdrive, the forward clutch and the 3-4 clutches are applied, as well as the 2-4 band. Now add the converter clutch. This is what the PCM monitors at cruise. If the ratio breaks away, the cause could be any of three components, the hydraulics that operate them or the electronics that control them. Fortunately, experience has shown that in most cases, the cause can be traced to some form of converter clutch failure as a result of valve body concerns. With GMs 4L80-E transmission, this code has usually been the result of a cracked converter clutch piston.
Put a line pressure gauge ($55 shipped on Ebay, or visit a local trans shop) on the pressure test port and go for a drive to verify proper line pressure. Base pressure at idle in P,N,OD should be around 70psi and around 140psi in R. Max line pressure should be at least 190psi at WOT in 1st or 2nd, 225psi is optimum. If base pressure is low, trans or pump is worn out. If max pressure is low, check EPC solenoid. If reverse is slow to engage, and line pressure does not come up to at least 130psi in reverse, replace the boost valve with a Transgo 0.049" - 0.500" boost valve (easy fix in pan), and replace the servo with an upgrade servo from a Corvette 4L60E. This will give you a more firm shift and address the DTC 1870 which is common to a weaken Boost valve or faulty EPC valve.
Posted on Jan 07, 2010
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