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  1. jrichker

    Gas fouled plugs

    Most auto parts stores will loan you a gauge if you have a credit card and not charge you if you bring the gauge back in good condition. Otherwise, here is Plan B... Fuel pressure gauge adapter fittings: http://www.holley.com/products.asp?product=17945NOS AN 4 to 1/16” pipe...
  2. jrichker

    Electrical Fuel pump

    Fuel Pump Troubleshooting for 87-90 Mustangs Revised 1-Dec-2015 to add fuse links diagram. Clue – listen for the fuel pump to prime when you first turn the ignition switch on. It should run for 1-3 seconds and shut off. To trick the fuel pump into running, find the ECC test connector and jump...
  3. jrichker

    Help with RF cobra 75.

    The following are diagrams courtesy of Tmoss & Stang&2birds Complete computer, actuator & sensor wiring diagram for 91-93 Mass Air Mustangs 5.0 wiring diagram for Fuel Injectors, Sensors, and Actuators See the following website for some help from Tmoss (diagram designer) & Stang&2Birds...
  4. jrichker

    Resolved Close to solving rough cold & hot idle, I think, but not sure how to move ahead

    Be sure to disconnect the battery after replacing the Baro/Map sensor. The computer will need to learn the adaptive settings with the new sensor in place. The car may run a little rough for a short while, but after 15-30 minutes of driving, it should smooth out.
  5. jrichker

    Engine No crank

    Do the checklist, it works and if you use it correctly, you will find the problem. I have been driving and fixing these cars since 1992, and that experience is reflected in the checklist. No Crank checklist for 5.0 Mustangs Revised 24-Oct-2013 to update voltage drop figures. No crank, slow...
  6. jrichker

    Electrical Injector pulse and 5v reference

    Computer will not go into diagnostic mode on 91-95 model 5.0 Mustangs Revised Dec 23 2017 1.) To clarify signal ground connections on the engine mounted fuel injector wiring harness and add diagram for the engine mounted fuel injector wiring harness 2.) To add warning about...
  7. jrichker

    Header Bolt Snapped off Please help

    Left unattended, the hot exhaust gases will damage the cylinder head flange where the exhaust manifold bolts on. Did the bolt share off flush with the block? If not, here is the first thing to try The exhaust manifold needs to be removed, which may break off more bolts. Once the exhaust...
  8. jrichker

    ECU on Stock 93 Mustang

    if you dump the codes and only get three 11's in a row and a 9 on the cylinder balance test, there is nothing to be gained by replacing the computer system but a bunch of headaches trying to make the replacement system work. Dump codes sticky Look at the top of the 5.0 Tech forum where the...
  9. jrichker

    Resolved Close to solving rough cold & hot idle, I think, but not sure how to move ahead

    Fix the codes first, You must fix the code 22... Use a vacuum gauge to test the idle vacuum - you should see 16"-19" of vacuum at 675-750 RPM engine idle. You should see 18"-21" vacuum at 1000 RPM. If the engine will not run smoothly at 1000 RPM, you may have mechanical problems. Post any...
  10. jrichker

    Engine Car idles fine, but will not rev with MAF plugged in. HELP!?

    Code 29 - Vehicle Speed Sensor (VSS) is an electronic sender mounted on the speedo pickup gear on the trans. It works the cruse control for both 5 speed and auto trans cars. The VSS is used to tell the computer to speed up the idle as you slow to a stop. This helps keep the engine from stalling...
  11. jrichker

    Engine Oil pressure help

    The drill needs to be a 1/2" drill set on low speed in order to get the pump to prime and move oil. It takes 60 - 90 seconds or more to get oil flow and pressure. The drill needs to turn counter clockwise. Look and the numbering on the distributor cap or firing order. The HO firing order is...
  12. jrichker

    Engine Problems in AL

    Since you have replaced some parts, clear the codes and drive the car before dumping them again. How to clear codes. Clearing the codes by pressing a button on the scan tool or disconnecting the test jumper used to start the code dump does not erase the “learned settings”. All it does is erase...
  13. jrichker

    Electrical a9p dead pin 33 & 46

    An A9P is am auto trans computer and it will work OK with a standard trans However, the internal wiring is different, so don't be too surprised that you get different resistance readings when you compare them side to side Computer will not go into diagnostic mode on 91-95 model 5.0 Mustangs...
  14. jrichker

    Interior and Upholstery Mystery bolt

    All the body bolts are metric and may be problematic to correctly size by eyeballing them. Each MM is about.040 of an inch Home Depot has a plastic size gauge that has bolt diameters and lengths See https://www.homedepot.com/p/Everbilt-12-in-Plastic-Bolt-Gauge-801004/204276636#overlay Bolt...
  15. jrichker

    Engine Fuel pump won’t turn on

    Fuel Pump Troubleshooting for 91-93 Mustangs Revised 6-Feb-2016 to add fuse link diagram Ignition switch in the Run position, engine not running tests. Clue – listen for the fuel pump to prime when you first turn the ignition switch on. It should run for 2-5 seconds and shut off. To trick...
  16. jrichker

    Electrical Starter blowing mega fuse to trunk battery

    Under no circumstances connect the two 10 gauge black/orange wires to the 3G alternator. If the fuse blows in the 4 gauge wire, the two 10 gauge wires will be overloaded to the point of catching fire and burning up the wiring harness. The secondary power ground is between the back of the intake...
  17. jrichker

    Electrical Master kill switch

    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...
  18. jrichker

    Electrical Ecu not sure a9l crank no start

    Have you done all this checklist and not skipped any steps? Shortcut: https://www.stangnet.com/mustang-forums/resources/no-crank-checklist.64/ It’s Decision Tree time: No spark = go to step #1 & 2. Good spark - what is a good spark can be a subjective judgment. If you have any doubts, borrow...
  19. jrichker

    2k RPM Idle at startup

    You guys with idle/stall problems could save a lot of time chasing your tails if you would go through the Surging Idle Checklist. Over 50 different people contributed information to it. The first two posts have all the fixes, and steps through the how to find and fix your idle problems without...
  20. jrichker

    Need help troubleshooting a possible EEC startup problem

    You guys with idle/stall problems could save a lot of time chasing your tails if you would go through the Surging Idle Checklist. Over 50 different people contributed information to it. The first two posts have all the fixes, and steps through the how to find and fix your idle problems without...