Search results

  1. jrichker

    87 gt t5 swap idle issues

    Computer & interchange information. The Mass Air computers from 89-93 are interchangeable with a few exceptions. Just be sure you use the MAF & MAF sensor from the same series computer. The auto transmission computers use a different start circuit than the manual computers. You can use an auto...
  2. jrichker

    Engine 1990 GT suddenly dies while driving

    Does the radio or blower motor for the A/C and heat quit at the same time? If they do, the problem is in the ignition switch. If not, the problem may be in the computer power relay or fuel pump relay. TFI and PIP problems usually make you wait until they cool down before they will do a restart.
  3. jrichker

    Blowing pip sensor

    There may be a mismatch between the distributor and the TFI module. They all look the same but the wiring scheme is different. How the TFI ignition works in 86-93 model Mustangs: Revised 15 Feb 2022 to add need for thermal conductive paste on the TFI module. Tools needed: DVM, noid light...
  4. jrichker

    Engine Engine - Need to know how to get to the vacuum reservoir for the smog pump.

    I need to find the vacuum reservoir for the smog pump. If you look at the 2 solenoid valves on the passenger side inner fender well metal, there are the 2 Thermactor Air (smog) pump valves that control the flow from the smog pump to the cylinder head or the exhaust system. Smog pump solenoid...
  5. jrichker

    90GT dumping fuel

    Short answer: Fuel pressure regulator failed. Remove vacuum line from regulator and inspect for fuel escaping while pump is running. Some more on the subject of fuel pressure... How the fuel pressure regulator works Revised 5-Jan-2014 to add how to set fuel pressure, Step 1.) Check fuel...
  6. jrichker

    Fuel Return Line for EFI Conversion

    @VasiliBrown The tank may fit, but the 86 fuel tank quantity sender has the wrong internal resistance. The fuel gauge will never work correctly. Fuel gauge sender ohms Copied from bstrd86 86 and older are 73 ohms empty, 8-12 ohms full. '87 up are 16 -22 ohms empty 145-158 ohms full. Fuel...
  7. jrichker

    Fuel Return Line for EFI Conversion

    Two Words DON'T DO IT This is not the "Roadkill" TV show, it is your life and you car. There are several risks involved. (1.) The return line circuit was never designed to carry the pressure and volume that the returning fuel develops. Restriction in returning fuel volume result in the fuel...
  8. jrichker

    Engine Please help !!

    I wrote the checklist.... Do it and you will find your problem...
  9. jrichker

    89 strange no spark, tfi question?

    How the TFI ignition works in 86-93 model Mustangs: Revised 15 Feb 2022 to add need for thermal conductive paste on the TFI module. Tools needed: DVM, noid light, safety pin. Theory of operation: The TFI ignition in 86-93 Mustangs has 4 main components: the ignition switch, the coil, the TFI...
  10. jrichker

    Distributor Install

    This doesn’t prove that the block is a HO block. Some trucks evidently use a HO firing order with a low lift cam (this will result in less than the desired HP output). However, it will definitely prove that a block can’t be HO because the firing order is wrong. Remove the #1 & #3 spark plugs...
  11. jrichker

    Engine OOOPS - dropped something down the intake when removing the lower intake manifold.

    I dropped something down the intake when removing the lower intake manifold... It was most likely a small screw or washer. When you remove the upper intake manifold, it is easy to cover up the openings in the lower intake once you have the upper intake removed. The lower intake is a different...
  12. jrichker

    Electrical CEL always on, after reset, KOEO code 66 and KOER code 98 & 66

    Code 66 or 157 MAF below minimum test voltage. Revised 2 Nov 2019 to add details on MAF testing Insufficient or no voltage from MAF. Dirty MAF element, bad MAF, bad MAF wiring, missing power to MAF. Check for missing +12 volts on this circuit. Check the two links for a wiring diagram to...
  13. jrichker

    70mm throttle body on stock intake?

    The stock heads are the bottleneck - they limit the flow so badly that any change in throttle body size is a waste of time and money. See https://www.stangnet.com/mustang-forums/threads/flow-rate-for-5-0-cylinder-heads.713161/post-7027297 for the flow numbers. OR Head Flow Data In CFM-Source...
  14. jrichker

    Fuel New fuel pump = low pressure

    PIP Sensor functionality, testing and replacement: Revised 17-Jul-2014 to add check for loose PIP mounting screws The PIP is a Hall Effect magnetic sensor that triggers the TFI and injectors. There is a shutter wheel alternately covers and uncovers a fixed magnet as it rotates. The change in...
  15. jrichker

    Electrical New Clock Spring nothing works on steering wheel still

    Simple first step. The horn shares the same fuse as the cigarette lighter. Look closely at the lighter socket and be sure there isn't a coin or washer laying in it. The horn circuit has a button that supplies ground, a relay that uses the button to switch the horns on and off, and two horns...
  16. jrichker

    Electrical Hard to Start, Rough Idle, Won't Rev Up/Barely Any Power to Drive

    There are two different 5.0 firing orders - which one do you have? This doesn’t prove that the block is a HO block. Some trucks evidently use a HO firing order with a low lift cam (this will result in less than the desired HP output). However, it will definitely prove that a block can’t be HO...
  17. jrichker

    Electrical Hard to Start, Rough Idle, Won't Rev Up/Barely Any Power to Drive

    The odd duck is the 93 Cobra computer, labeled X3Z which is internally calibrated for 24 lb. injectors. Use the MAF & MAF sensor from the X3Z computer to avoid problems with the computer's internal calibration. Try and avoid the 93 Cobra computer if you can. You should be able to use the...
  18. jrichker

    runs great, for 5 minutes

    Wrong answer... Code 15 or 511 - No Keep Alive Memory power to PCM pin 1 or bad PCM (Memory Test Failure). Revised 4-Jan-2019 to add removing any custom tuning chip for minimum configuration testing. The voltage to the Keep Alive Memory (KAM) is missing (wiring problem) or the KAM is bad...
  19. jrichker

    runs great, for 5 minutes

    @Jamie C. Fuel pump pressure & regulator test Check fuel pressure: The local auto parts store may rent or loan a fuel pressure test gauge if you don't have one. Disconnect the vacuum line from the fuel pressure regulator. Check it for evidence of fuel present in the line by removing it and...
  20. jrichker

    Electrical 1987 - IAC valve (Diode & Ohms)

    Since the diode has greater resistance than the solenoid coil, you will never see it when you measure the resistance with a Multimeter or DVM. The meter will see the lowest resistance (the solenoid coil) and return that value. Using a diode as a dampener in automotive circuits: Theory of...
Top Bottom
Back
Forums
Menu