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  1. jrichker

    Engine Will a newer TFI coil work in a Duraspark II system

    Duraspark wiring Note the ballast resistor shown in the diagram: you’ll need that too If you use a coil from a 78 or later Mustang, you don't need the ballast resistor. The stock 89 Ford/Mustang ignition coil does not need a ballast resistor A simpler HEI ignition that uses the same...
  2. jrichker

    Engine K Member to motor mount nuts

    All you need is 2 full threads showing past the end of the nut. The threads on the motor mount stud are an interference fit with the nuts that come with the car. I guess that keeps them from coming loose. I could not get then to tighten down so that nut firmly contacted the K member, even with...
  3. jrichker

    Throttle Position Sensor Voltage Climbs!

    Troubleshooting loss of signal ground Revised 21-Aug-2013 to rewrite the MAP/Baro testing of the signal ground and moving the testing the computer’s internal signal ground test procedure to the last place. 1.) The computer pin 46 signal ground is a critical component: it provides ground for...
  4. jrichker

    Ignition switch wiring & nss voltage should be?

    Recall on Ford Ignition switches: Revised 7-June-2014 to add Torx bit picture and source. Also added replacement ignition switch wiring pigtail picture, part numbers and sources. Some of the symptoms of ignition switch problems are things that don’t work or are intermittent like radio, turn...
  5. jrichker

    Electrical 89 fox 5.0 crank no start when cold

    @DruryFoxbody Dump the codes: Codes may be present even if the Check Engine Light (CEL) isn't on. Dumping the computer diagnostic codes on 86-95 Mustangs Revised 26-July-2011. Added need to make sure the clutch is pressed when dumping codes. Codes may be present even if the check engine...
  6. jrichker

    Engine Idle issue - Possible Vac leak - canister purge valve?

    Thermactor Air System Some review of how it works... Revised 25 May 2019 to re-order paragraph sequence and add lean burn description for newer cars The Thermactor air pump (smog pump) supplies air to the heads or catalytic converters. This air helps break down the excess HC (hydrocarbons)...
  7. jrichker

    1989 GT cranks but won't start

    I'm the guy who wrote the checklist, and I have been driving and fixing pushrod 5.0 EFI Mustangs since 1991. Do the checklist, you don't have to be a mechanic to understand it and make it work for you.
  8. jrichker

    Engine 89 lx 5.0 sporadic missing and dies

    Step 1 Dump codes sticky Look at the top of the 5.0 Tech forum where the sticky threads are posted. One of them is how to dump the computer codes. Codes may be present even if the CEL (Check Engine Light) isn’t on. You don’t need a code reader or scanner – all you need is a paper clip, or if...
  9. jrichker

    Drivetrain Speedo problem

    The lights for the vanity mirrors on the sun visors must have the hard flap covers in place and be in good shape. There is a switch next to the mirror that is activated when the mirror is uncovered.
  10. jrichker

    Motor not sitting correctly with new motor mounts

    The motor mounts look very similar, but are not the same. There is a left side mount and a right side mount, and the ones I got had no markings straight out of the box. You may have them switched side for side. The motor mounts use a an interference fit nut which is an odd size. I could not...
  11. jrichker

    93 Cobra Power Upgrades Help

    Since your 93 Cobra already has some of these mods, there are items in the first step that do not need not to be considered for replacement. Far too many people put a dab of this and a dollop of that, and then wonder why the car doesn't run worth beans. Then they think off the shelf computer...
  12. jrichker

    Engine With all smog components deleted, will that activate a CEL?

    Some basic theory to clarify how things work is in order… EGR System theory and testing Revised 29-Sep-2013 to add code definitions for EGR sensor and EVR regulator. The EGR shuts off at Wide Open Throttle (WOT), so it has minimal effect on performance. The addition of exhaust gas drops...
  13. jrichker

    1991 Mustang 5.0 Vacuum Hoses

    Always check the code definition before replacing parts. It will save time, money and sweat,,, Code 34 Or 334 - EGR voltage above closed limit – Revised 26-Sep-2011 to add EGR cleaning and movement test for pintle when vacuum is applied to diaphragm Failed sensor, carbon between EGR pintle...
  14. jrichker

    Engine Distributor problem HELP!!

    For best results, upload video to YouTube and the post the link in your post. You will be surprised at how easy it is and how well it works "sparks coming out from my hold down screw ". Is the bolt that holds the distributor in place what you are talking about? What kind of sparks are you...
  15. jrichker

    1991 Mustang 5.0 Vacuum Hoses

    Some basic theory to clarify how things work is in order… EGR System theory and testing Revised 29-Sep-2013 to add code definitions for EGR sensor and EVR regulator. The EGR shuts off at Wide Open Throttle (WOT), so it has minimal effect on performance. The addition of exhaust gas drops...
  16. jrichker

    Engine ECM Issues

    They have a definite life cycle and after 22 or more years, they start to fail. The failure mode is they dry out because the liquid electrolyte leaks out. Then they burn up or blow the top out of the can that they are packaged in. A clue to failure is the top of the can starts to bulge. When you...
  17. jrichker

    Electrical Drained battery and check engine light.

    The computer will relearn the adaptive settings after 15-20 minutes of normal driving. Be sure to include at least 7 minutes of highway driving for best results. Dump the codes: Codes may be present even if the Check Engine Light (CEL) isn't on. Dumping the computer diagnostic codes on 86-95...
  18. jrichker

    Electrical Wiring power from trunk to front

    Rear mounted battery wiring recommendations For a battery cut off switch, see https://www.moroso.com/catalog/product/view/id/8487/s/battery-and-alternator-disconnect-switch74108/category/3114/ is the switch https://www.moroso.com/pub/media/instructions/74108_instweb.pdf is the installation...
  19. jrichker

    3g Alt Voltage Regulator Sense Wire?

    Evidently you didn't look very closely at the diagram - the main connection for the yellow wire after the alternator is the wiring connection that goes directly to the battery positive terminal. On a Fox body Mustang that is the battery side positive terminal connection of the starter solenoid...
  20. jrichker

    Fox check valve broke off

    The EGR ports are 5/8" coarse thread - use some short bolts from Home Depot . They will do the trick to make plugs for the heads if you want to plug them. You might cut the bolts off until they are about 1/2"- 5/8" long. I just cut off the heads of the bolts and used the cutoff tool to make a...
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