Car seems like its hitting a rev limiter

Discussion in 'Fox 5.0 Mustang Tech' started by egobr8r, Nov 13, 2012.

  1. Ok 92 fox; swaped out the 4 cyl for the eight and also automatic to a stick. Car starts and idles fine and drives fine until you floor it, it seems like the car is going to go but then all of a sudden it seems like it hits a rev limiter. It does it in first gear and second. But sometimes you can roll into the throttle in first and it doesn't have a problem but it still will do it in second. List of stuff on the car and what I have done so far, rebuilt 302,gt40p heads explore upper and lower intake; 24 lbs injectors, mass air meter calibrated for the 24lbs injectors,cai, shorties headers, brand new wires and plugs (auto lites) and changed the fuel filter. But still have the 7.5 rear end under the car , any help would be greatly appreciated and thanks in advance.

    Ps yes I have the 92 computer and harness
  2. You put your thread in a forum specifically for people who have tuning questions about things like injectors, MAFs and aftermarket tuners such as Tweecer, Moates or Anderson PMS. Therefore you post will not been seen by people who may have an answer but do not visit the Tuner forum. Convertible top problems have nothing to do with tuning an engine.

    My advice to you is to twofold:
    1.) Send a PM to one of the moderators and have your thread moved to 5.0 Tech
    2.) Next time you start a thread, think about where it goes. If you are new to Stangnet, please read the terms of service and give extra thought to where your new thread belongs. There is some help in the text below to help you find the best place to start your thread.

    Tuning problems go in 5.0 Tuning, with specific emphasis on modifications to the injectors, MAF and computer, along with aftermarket tuners such as Tweecer, Moates or Anderson PMS.

    General tech problems go in 5.0 Tech. Tech is for suspension, electrical, brakes, body, engine repair and general troubleshooting on the computer & trouble codes

    Tall tales about your 5.0 Mustang, pictures of your 5.0 Mustang project and stories about your last trip to the race track go in 5.0 Talk.

    Do this and you'll get the best answers quicker and not get lost in the maze of posts about everything but the type of problem you are having.

    Having said that, here's some help...

    The TFI module mounted on the distributor is usually the culprit for a high speed miss on a warm engine. If the problem does not occur when the engine is cold, the TFI module is definitely suspect. You may need a special socket to remove the TFI module, but most auto parts stores will have one for $5-$7.

    Be sure to use plenty of the heat sink grease on the new TFI and clean the old grease off the distributor.

    View attachment 138301

    See Automotive Tools Specialty | Auto Mechanic & Technician Diagnostic, Testing Equipment | Thexton
    diagram courtesy of Tmoss & Stang&2Birds

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  3. Sorry for bringing up a 3 year old thread from the dead... But please tell me if you found the problem!! This is the only thing i can find on the internet that has the same symptoms as me. hopefully you still use this account lol. Thanks