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Acceleration Problems

(1994 Mazda MX-6)
in Tomahawk, WI on February 09, 2010
I've had my MX-6 for about 4 years now, and just recently have started having problems with how it runs. It started with a very noticeable rough idle, and has progressed now so that the engine is sluggish when responding to acceleration, and when I'm anywhere near 3000rpms, the engine will shut off completely, however it will not shut off every time, but most of the time it will. I've taken it in, and the shop says that it could be a problem with the fuel pump, however they can only tell if that’s the problem after they replace it. I'm hesitant to invest $200+ in replacing a part that might not even be the problem. Anyone who has any knowledge about what the problem could be or how to check for other causes rather than just replacing the fuel pump, I would be extremely grateful
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Popular Answer
There are too many things that could contribute to this type of problem, The fuel pump could be the problem but should be easier to be certain it is the cause by "Tee ing in " a fuel pressure gauge and taping it to the windscreen of the car and then going for a test drive. When the car experiences the problem check to see if the fuel pressure drops or fluctuates. Also check the "dead head pressure" and fuel volume (it should produce 1 pint of fuel in 10 seconds). If fuel pressure and delivery is not the problem its time to verify the operation of varies sensors that tell the computer how much air is going into the engine and where the engine components are (crank shaft and camshaft position sensors) a glitch in any sensor used to give inputs to the computer will cause problems like what you describe.
Autozone have some popular workshop manuals for free on line once you register (for free) on their website .There is a company that independent auto repair shops "buy" their information from that offer a very reasonable service to do it yourselvers. You get a one year subscription to year make and model specific repair procedures, service bulletins, component locations, wiring diagrams ect.... great quality information same as the professionals have ,much better than generic workshop manuals from parts stores, much cheaper than the factory manual. or try and get an online repair manual subscription.
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