November 25, 2005i have a 302 in an 87 f-150 from a 89 bronco and all of a sudden i cant get it to start. i checked and there is no spark, i replaced the coil and that didnt do the trick. what are some other possibilities that it could be?
Forums : Engines-Gasoline 8-cyl : No spark in an 89 302 (43 Views)
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November 26, 2005Assuming this is TFI, although I don't think it would matter for duraspark--
#1. Check the power relay on the computer. And this means remove the relay and jumper it so it's always on (with a paperclip or piece of wire or something). I learned that lesson the hard way--just because a relay clicks doesn't mean it works.
#2. If that checks out, see if you're getting a tach signal--e.g. is the pip sensor in your distributor working properly? I guess the only way to test this would be to check your tach and see if it climbs when you crank. If you don't have a tach, hook up a multimeter.
#3. If both of those check out, which are quick and easy to do then I'd say your TFI module is bad. You can check it out by measuring resistances, there's places online that tell you what the values are. You'll need a shallow wall 5.5mm socket to get the thing off too. Might as well pick one of those up at the parts store while you're at it... I believe they're called "TFI wrenches".
And that's all there is really unless a wire is broke somewhere.
November 26, 2005The distributor-mounted TFIs are notorious for burning out suddenly. I think there was even a class-action lawsuit over them. Get a Haynes manual & a decent multimeter ($10-50) and follow the ignition diagnostic procedure. It WILL identify the fault without throwing part$ at it.