Question about 1995 Ford Mustang

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My 1995 mustang is throwing code PO240 saying camm sensor circuit something. i replaced the camm sensor, crank sensor, crank sensor connector and the ecm. no clue on what it could be. if you have any answers please let me know

Posted by muhles90 on


1 Answer


I wouldn't expect a professional to replace all you mentioned,so did you just throw parts at it yourself and why?
Other than a MIL Lamp and one code,what are the issues?

Posted on Sep 17, 2010

  • 3 more comments 
  • muhles90 Sep 17, 2010

    No I was told to change these parts by an ASE certified technician who I am friends with and I am also a state certified technician so I'm completely clueless on what i am doing. My main problems are that it idles rough and from 55-65 mph the motor vibrates. When my friend hooked it up to his scanner it said unable to detect cylinders from the same code.

  • Anonymous Sep 17, 2010

    Between the two of you,both knowlegable as you stated,what tests were performed and how were they done. Are you following a factory diagnostic chart or tree or are you beyond that? Are you using an oscilloscope on these components, one at a time,before replacing. Too many items to fail around the same time!
    Have you checked the mechanical condition of the engine. Go back to basics. Did you do a cylinder leak down or consider cam wear or bearing issues.
    Are you sure the vibration is in the motor and not the drivetrain?

  • muhles90 Sep 17, 2010

    no the only test done were from a high end mac scan tool. the motor only has 25000 miles on it so i wouldn't suspect any wear on the cam i could be wrong. i really haven't had much time to perform a cylinder compression test or any other diagnostic testing. it kind of stumped both of us. i figured it was just the cam sensor since thats what the code was for then again it was also saying unable to detect cylinders. By the way if this helps its also a 3.8 v6

  • Anonymous Sep 17, 2010

    I will keep getting back to you, but what concerns me,is your ASE friend having issues with this. Codes don't tell you what to replace. They are sensors out range, for a reason. Codes only point you to an area, to start your diagnostic testing. You need to know the systems your working on, and have experience or reference material to follow. The ability to use logic is the key to solving your issues. Your not stumped,your need to know what does work and stick to basics.Work on the engine drivability first,then the higher speed vibration. Always learn every components function,then test it. Get a wiring diagram, if you need to back probe to test live data.

  • muhles90 Sep 18, 2010

    thanks for the help. like i said i just havent had time to have my car worked on especially since its my only means of transport. my buddies shop has been busy lately so hes just going by what ive told him its doing and the code. He hasn't been able to actually look it for further diagnosis. if you come up with any explanations email me at [email protected] thanks again



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Have a 2001 won't start no spark new crank and can and coil pack code keeps saying its no reference signal from crank position sensor

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1990 ford mustang lx 5.0L Code 54 How do i fix this

Fault Code 54

Description: No fuel injector sync pickup signal during engine rotation
Power loss light: On
Limp-in mode: Logic module will guess at injector timing

Possible Causes:
Bad connection or wiring - Check the wiring and connections between the hall effect sensor (located underneath the distributer cap) and the logic module. Check the continuity of the two 3 conductor cables coming out of the sensor--these are prone to fatiguing and breaking inside the insulation where they exit the sensor if the cables are not properly tied down. You may be able to resolder them. Clean and regrease any corroded connectors with dielectric grease and repair any shorts.

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Trigger Parameters
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