1999 taurus no start
#11
Have you checked al fuses? Also need to know if the injectors are pulsing to allow the fuel to be injected into the engine. Parts houses have a tool called a "noid" light that will flash if the injectors are being pulsed by the PCM.
#12
taurus
yes i used my noid light to see if the injectors are pulsating and they are. I also ran a compression test today on it. All six cylinders ranging from 120-180. 180 is on the high side, but should start. I have fuel spark and compression. Would unbolting the exhaust and trying to start it then be a waste of time? Let me know your thoughts. Thanks
#13
taurus
yes i used my noid light to see if the injectors are pulsating and they are. I also ran a compression test today on it. All six cylinders ranging from 120-180. 180 is on the high side, but should start. I have fuel spark and compression. Would unbolting the exhaust and trying to start it then be a waste of time? Let me know your thoughts. Thanks
#14
You do not need to unbolt the exhaust. Just remove the O2 sensor. If it starts, there is a restriction in the exhaust. Hold the accelerator all the way to the floor while cranking to clear the cylinders in case it was flooded for any reason. I would check to be sure the plugs have not been fuel fouled for any reason also.
#15
Removed the 02 sensor tried to start no luck. The wiring on the 02 sensor is all chewed up like something was biting on it. doesn't really make a difference since it was out anyways. Also tried starting car with air filer out and mass air flow unplugged. Still no luck. Put a paper clip into the Coolant Temp Sensor because if the coolant temp sensor was bad it would make the car think it was -40 degrees this would make the car think its 0 degrees with the clip inside of the prongs. Still no luck. Any more ideas? You can feel pressure coming out of the exhaust when trying o start. I have fuel, spark, compression, air, and its letting air back out. what more does this motor need! lol thanks
#20
I have been following this thread and it appears you have an unusual situation.
Way2old has been doing a great job assisting you and I hope he doesn't mind somebody suggesting an idea or two.
Here is how I see this so far, fuel gets to the cyls through the injectors only, but we have no way to determine what the on time is for those injectors other than a noid lite.
Do you have any way to measure the injector pulse width?
If your TPS loses it's ground, the PCM will get the full voltage from the TPS circuit thinking the engine is in clear flood mode. And we know it can't run without fuel. That's one of the things I would suggest for you to verify. Check all the ground connections and see if you can find the one for the TPS.
Way2old has been doing a great job assisting you and I hope he doesn't mind somebody suggesting an idea or two.
Here is how I see this so far, fuel gets to the cyls through the injectors only, but we have no way to determine what the on time is for those injectors other than a noid lite.
Do you have any way to measure the injector pulse width?
If your TPS loses it's ground, the PCM will get the full voltage from the TPS circuit thinking the engine is in clear flood mode. And we know it can't run without fuel. That's one of the things I would suggest for you to verify. Check all the ground connections and see if you can find the one for the TPS.