Question about 1983 Ford F150

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1983 Ford 150 6 cyl...Starts easy, idles relatively smooth, runs good up to 50 - 55 then when given more throttle engine starts to surge and can't get over 60. Would appreciate any thoughts on this.

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  • dedhaupt Jun 14, 2009

    Thanks Charlie
    Will give this a shot

  • dedhaupt Jun 19, 2009

    Charlie...Thanks once again for your insight which literally got my troubleshooting thought process going. Fuel pressure good, fuel filter good, catalitic converter appears to be ok. Got to thinking about what it was doing and got stuck on the electrical system. Checked their battery and found absolutely no water in it, replaced it and problem went away. I'm sure you can figure out why...thanks....ed



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Install a fuel pressure gauge on the system. Run the engine up to the problem speed and watch to see if the fuel pressure drops down. If it does, replace the fuel filter and re-test. If the fuel pressure still drops, replace the fuel pump.
Another possibility is a partially clogged catalytic converter.

Posted on Jun 14, 2009

  • Charlie Jun 14, 2009

    A bad catalytic converter will rattle inside when you pound on it with your fist. Obviously, you have to do this when the exhaust system is cold. The Noise inside is caused because the engine has been run excessively rich for many months. This causes the catalytic convert to overheat. The constant overheating breaks the platinum coated ceramic matrix inside the converter. Once the matrix breaks apart, it will intermittently or constantly plug the outlet of the converter.

  • Charlie Jun 19, 2009

    Good job finding a very odd problem! Yesterday I fixed a 2004 F150 which would not go over 50 mph. Catalytic converters (it has 4) did not rattle. However all sensors and electrical tests came up good. I replaced the converters and fixed the problem. The "upstream" converters had just started to clog up.

    I suspect that the battery in your customer's vehicle overheated at speed (more alternator output) and caused some sort of odd short circuit in the system. I would also check the alternator for a possible shorted rectifier diode.




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