Question about 1990 Ford F150

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Transmission Shifting Problem

I just bought this truck, 1990 F150 5.0 302 Auto 2WD, and I had a diagnostic test run on it. I had to replace 5 sensors/modules. It runs great now, except it has trouble accelerating. If I give it a lot of throttle, the RPMs climb quickly, but it accelerates slowly. I just had it timed. Before it was timed properly, it did not seem to have this issue. Is there any transmission shift sensor? Thank you for you help and your time.

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  • kevingrulke May 11, 2009

    Yes, I have checked the tranny fluid. It shifts/accelerates like this in all gears. The part I don't get is when the timing was advanced (too far) it quit doing this. But the timing was so bad my truck wouldn't stay idling. Thank you for your help.

  • fplqnewc
    fplqnewc May 11, 2010

    Is there a vacuum advance on your distributor?  Do you have points or electronic ignition?  Could there be a superchip installed on your computer that is messing with the ignition advance?  I had a defective superchip on my Taurus SHO that was causing my car to stall out from time to time (just another thought).  Removed the chip and problems went away.


    You shouldn't have to choose between good timing and good acceleration.  That is what is sounds like right now - get the timing correct and acceleration goes bad, advance the timing to get acceleration and truck won't idle.  If your truck had good acceleration prior to it being timed, then your transmission clutch plate is good.  I would focus on those things that affect the timing advance during acceleration.

  • fplqnewc
    fplqnewc May 11, 2010

    Have you tried giving it a lot of throttle in L1, L2 or even reverse to see if you have the same results? Have you checked your transmission fluid level? Also, check the color of the transmission fluid. It should be bright red and shouldn't smell burnt or look dark. Transmission shifts based on fluid pressure in the transmission. If you don't have enough fluid or it has degraded due to abuse, it won't have the needed properties to shift well.

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Need to recheck the timing these symtoms can be caused by to slow timing ing I would get the timing setat 8-10 degrees above 0 if it starts to give a pinging noise under loads back off timing a couple degrees

Posted on Feb 17, 2010

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Where is the four wheel module located on a 2001 f350 7.3 l lariat 4x4 nothing on the four wheel drive works and I checked all the fuses and are all fine


Have it check for DTC'S - diagnostic trouble codes ?
GEM Diagnostic Trouble Code (DTC) Index
GEM Diagnostic Trouble Code (DTC) Index DTC Description Source Action C1728 Transfer Case Unable to Transition Between 2H and 4H GEM CARRY OUT the electronic shift function test. REFER to Function Test - Electronic Shift in this section. C1729 Transfer Case Unable to Transition Between 4H and 4L GEM CARRY OUT the electronic shift function test. REFER to Function Test - Electronic Shift in this section. P0500 Vehicle Speed Sensor (VSS) Malfunction GEM GO to Pinpoint Test F . P1804 Transmission 4-Wheel Drive High Indicator Circuit Failure GEM GO to Pinpoint Test H . P1808 Transmission 4-Wheel Drive Low Indicator Circuit Failure GEM GO to Pinpoint Test I . P1812 Transmission 4-Wheel Drive Mode Select Circuit Failure GEM GO to Pinpoint Test E . P1815 Transmission 4-Wheel Drive Mode Select Short Circuit to Ground GEM GO to Pinpoint Test E . P1819 Transmission Park/Neutral Position Switch Short Circuit to Ground GEM GO to Pinpoint Test F . P1820 Transmission Transfer Case Clockwise Shift Relay Coil Circuit Failure GEM GO to Pinpoint Test E . P1822 Transmission Transfer Case Clockwise Shift Relay Coil Short to Battery GEM GO to Pinpoint Test E . P1828 Transfer Case Counterclockwise Shift Relay Coil Circuit Failure GEM GO to Pinpoint Test E . P1830 Transmission Transfer Case Counterclockwise Shift Relay Coil Short Circuit to Battery GEM GO to Pinpoint Test E . P1832 Transmission Transfer Case Differential Lockup Solenoid Circuit Failure GEM GO to Pinpoint Test G . P1834 Transmission Transfer Case Differential Lockup Solenoid Short Circuit to Battery GEM GO to Pinpoint Test G . P1865 Transmission Transfer Case Contact Plate Power Short to Ground GEM GO to Pinpoint Test E . P1866 Transmission Transfer Case System Concern - Servicing Required GEM CARRY OUT the electronic shift function test. REFER to Function Test - Electronic Shift in this section. P1867 Transmission Transfer Case Contact Plate General Circuit Failure GEM GO to Pinpoint Test E . P1876 Transmission Transfer Case 2-Wheel Drive Solenoid Circuit Failure GEM GO to Pinpoint Test G . P1877 Transmission Transfer Case 2-Wheel Drive Solenoid Circuit Short to Battery GEM GO to Pinpoint Test G . - For All Other DTCs GEM GO to Section 419-10 .
Your best bet , take it to a qualified repair shop that has the diagnostic tool to trouble shoot .
Principles of Operation
Transfer Case - Electronic Shift
The four-wheel drive, electronic shift-on-the-fly feature electrically shifts the vehicle transfer case between 2WD, 4X4 HIGH, and 4X4 LOW. The system mode is selected by the operator through the mode select switch (MSS) on the instrument panel. The operator is informed which mode the system is in by two instrument cluster indicators, one for 4X4 HIGH which is 4X4, and one for 4X4 LOW which is LOW RANGE (in 4X4 LOW both the lamps are on). Shifts into 4X4 HIGH can be made at any speed. When shifting into 4X4 HIGH with the vehicle stationary, tooth blockage may occur, preventing shift completion. When the vehicle is driven above 8 km/h (5mph) the shift will complete. When shifting in or out of 4X4 LOW, the generic electronic module (GEM) requires that the vehicle speed be less than 5 km/h (3 mph), the brake pedal be applied, and the transmission in NEUTRAL (automatic transmission) or the clutch pedal be depressed (manual transmission). (The digital transmission range [TR] sensor informs the GEM when the automatic transmission is in the NEUTRAL range position.)
The gearmotor encoder assembly is mounted externally on the transfer case. It drives a rotary cam which moves the mode fork and the range fork within the transfer case between the 4X4 HIGH, 4X4 LOW, and 2WD range positions.
The GEM uses two relays to control the gearmotor encoder assembly shift between 4X4 HIGH, 4X4 LOW, and 2WD modes. The GEM controls the pulse vacuum hublock (PVH) solenoid which supplies engagement and disengagement vacuum to control the hublocks.
The GEM accomplishes shifts by interpreting inputs from:
  • mode select switch (MSS)
  • vehicle speed signal (transmitted from the ABS system)
  • gearmotor encoder plate position
  • brake pedal switch
  • digital transmission range (TR) sensor (automatic transmission)
  • clutch pedal position (CPP) switch (manual transmission)
  • ignition switch
Based on these inputs, the GEM controls the shifts into 2WD, 4X4 HIGH, or 4X4 LOW with the following outputs:
  • low to high relay (clockwise)
  • high to low relay (counterclockwise)
  • pulse vacuum hublock (PVH) solenoid
  • gearmotor encoder assembly
The electronic shift-on-the-fly (ESOF) system has a feature which allows the driver to override the vacuum operated hublocks. When the front hublocks are manually turned to the LOCK position, the hublocks are locked at all times, overriding the vacuum operated system. If the front hublocks are manually turned to the AUTO position, the hublocks can only be locked by turning the MSS to 4X4 HIGH or 4X4 LOW position.

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1 Answer

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If my 1990 gmc sierra 1500 2wd automatic 5.7 wont shift past 2nd is it possible that if I just replace the torque converter that it will be good as new or do I have to change the whole transmission


neither
the torque converter has nothing to do with the gear shifting and unless the transmission is making weird and funny noises , there is every possibility that it is still good
the procedure that you should be following here is to have the fault codes read as it may be a servo/ solenoid that is faulty , a VSS ( vehicle speed sensor) that is faulty or a TCM ( transmission control module ) that is faulty
All of these pieces control gear shifting so the second gear or 3rd gear servo may be out or the TCM is not shifting the ratio
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