got a 1994 b2300 mazda truck turns over wont start, changed battery, plugs, wires, starter, ignition module, fuel pump, fuel filter, had entire electrical checked at shop came back fine. have paid out almost a grand and it still does not start. my mechanic has given up on it and towed it back can someone please help
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1994 Mazda B2300 Question: turns over wont start
Answer #1Superbob March 28, 2011, 12:31Master
You need to check fuel pressure (should be around 35 PSI with fuel pump activated, like when you turn the key to RUN (fuel pump runs for 1 second, I think), or when you turn the key to START. If the fuel pump's not running at all, check that the inertial fuel cutoff switch under the brake power booster has not been tripped. If you can push the button in and it clicks, it was tripped. It can be tripped by releasing the park brake sometimes. Check that you have spark when cranking the engine. Check that you have injector pulse using your test light or meter at the injector connectors. If you have all that OK it should start unless the timing belt has failed and skipped enough teeth that the engine won't run. I'd assume that the shop has checked all this and it's all OK but any one of these factors would prevent your engine from starting. I'm assuming that the engine won't even fire, not that it'll start and die which is different than no start at all.
Word to the wise: Don't spend money, time and energy replacing parts unless you've diagnosed that the parts are faulty. Sounds like a lot of guesswork's been done here and nobody's gotten lucky. If nothing works for you, tow the truck to a Ford or Mazda specialist. These things are not so hard to diagnose if you have the right tools and experience and know the vehicle.
If you want to find a specialist, here's a directory link for you: