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Originally Posted by Clayton
My 95 GT will not start!! I changed the coil, fuel filter, cap and rotor, and check the timing and tapped on the maf sensor. where can i get a code tester for EEC IV. also on the 95GT is the MAP Sensor a cylindrical unit on the passenger side of the firewall with a vacuum hose coming from the intake and pluging into it and exiting to who knows where, never investagated it ....yet.
Can somebody please help or give some advice on what it may be!
thanks
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There are actually very few issues which can cause a no-start condition compared to a poor run condition. Most of the sensors do not contribute to starting.
It's still fuel, air, compression, spark. One of those items is missing. Due to the fact you have a V-8, it's unlikely that all cylinders would experience a sudden, massive drop in compression across the boards.
That leaves fuel, air and spark. It's a very good bet that air is getting into the cylinders.. but in the necessary volume? Probably. Like I said, very few sensors actually do a whole lot for starting procedures, and the sensors that do have to do with calculating fuel to inject rather than controlling the actual amount of air entering the engine.
So fuel and spark. Do you hear the fuel pump prime when you turn the key to the "run" position? Not all the way to start, but just to run. It should prime for a second or two, which is indicated by a relatively high pitched whirring sound originating from under the back of the car (fuel tank).
Spark. You've replaced the coil, which was a guess. Do you have spark? Is the spark strong? Pull the number one cylinder spark plug, and have an assistant ground the plug against a clean engine bracket. The spark should be bright and blue to blueish purple. Faulty plugs or plug wires along with a worn or encrusted cap and rotor can definitely contribute to a no-start condition, and they're cheap/easy to replace. If you have good spark, it's likely you have a fuel problem. You actually have a very wide range of timing for the engine to start. It's probably up to about 20* total. It might run like crap, but it should start.