COMPLAINT: After overhaul vehicle exhibits delayed and/or a shuddering condition, when shift lever is engaged into any forward range, followed by an immediate abort to “Limp Mode.”
CAUSE: The cause may be, that during the valve body cleaning process, retainer No.3 and/or one of the small “Buttons” in the solenoid switch valve train was not installed during reassembly. These parts can usually be found in the bottom of the solvent tank.
CORRECTION: Install the solenoid switch valve train and retainer No.3 as shown in Figure 1.
NOTE: Retainer location No. 4 and Torque Converter Clutch Switch Valve Train shown in Figure 1 are for “92 ” and later only!
You can get more hot car tools like VAG K Can and BMW INPA k can for help.
COMPLAINT: When the manual selector lever is placed into either Drive and/or Reverse from the Park and/or Neutral position, a “Buzzing” noise is heard coming from the transaxle area for approximately one to two seconds and then stops. Find obd2 scanner?
CAUSE: This noise is created by the solenoid assembly which includes four different solenoids.
CORRECTION: The “Buzzing” noise described above is NORMAL. The ONLY thing that can be done to help alleviate the “Buzzing” noise, is to ensure that the Solenoid Assembly Sound Cover is present, and installed properly as shown in Figure 1.
DELAYED FORWARD ENGAGEMENT OR PREMATURE FAILURE OF THE FORWARD CLUTCH
COMPLAINT: ZF-4HP-18 transmissions may exhibit a no move condition in any forward range and works fine in reverse.
CAUSE: One cause may be that either the 3-4 or 4-3 traction valve in the valve body has stuck in a stroked position preventing forward clutch apply (See Figure 18).
CORRECTION: Remove the valve body from the transaxle. Inspect and free the valve that is stuck.
You can get more hot ones like U585 and u581 scanner to do better on auto repair.
Vehicle shakes during breakaway in reverse with medium to heavy throttle application (i.e. backing very slowly up a steep grade or backing up a trailer). Maybe you need some obd2 scanner for help?
Warm vehicle to normal operating temperature. Locate a relatively steep grade (where it is safe to stop and back up). Try backing the vehicle up very slowly from a full stop. If a sufficiently steep grade is not available, move the vehicle to an open, flat, paved area where it is safe to stop and back up. Apply the parking brake about half way. Shift to reverse and slowly open the throttle until the vehicle just begins to move. Vehicle speed should be no more than a slow walking pace. Extreme care must be taken not to overheat the transmission during this test. Do not open the throttle more than 10 seconds at a time. A low the transmission to cool by running at a fast idle in neutral for at least three minutes between attempts to breakaway during either of these tests, do the following repair:
1986 Passenger Car Application
Fifth Avenue, Grand Fury, and Diplomat
Engine Transmission Torque Converter Number
318 (5.2L) A-999 Low stall/lock up 4431113
This repair involves the replacement of the torque converter.
1. Check engine for any driveability problems. Low carburetor air flow, early EGR valve operation, etc. have been found to be a contributor to reverse shake in some vehicles.
2. Perform a propane adjustment and/or correct any other driveability problems that may exist with the vehicle, using the appropriate Driveability Test Procedure.
3. If correcting any driveability problems with the vehicles does not eliminate the reverse shake, then it will be necessary to replace the torque converter with a new one.
4. Select the appropriate torque,converter for the vehicle from the parts list.
5. Replace the torque converter per the appropriate service manual Instructions.
6. Road test the vehicle and check for leaks.
If you want to know more car diagnostic tools like fly100 and Ford scanner, you can search the obddeal.com, where you can find the useful tools.