Question about 1996 Ford Crown Victoria
Sounds like you're on the right track. A bad TPS and ISC motor sensor
will cause the problems you're experiencing. Your ECM relies on the
readings it gets from the TPS to be sure there is enough air getting to
the engine. If the ECM gets a bad reading and thinks not enough air is
getting to the engine, it will cut the fuel supply, hence causing your
engine to die. Your ISC relies on the reading from the TPS as well.
It detects from the ECM if the throttle plate is closed or not. If
it thinks the throttle plate is fully closed, it will start allowing
air to enter the engine and bypass the throttle plate. If your ECM
starts seeing some unmeasured air coming from ISC and detects the
throttle plate is open (which it may not be due to a bad TPS reading),
the ECM will again cut the fuel supply to avoid the risk of detonation.
So, replace your TPS first and see if that cures your problem. Also, check the resistence readings of your ISC to be sure that is within spec. If your problem still occurs, check your Intake Air Temperature (IAT) sensor in your air filter housing. Be sure your spark plugs, plug wires, and distributor are all in good shape as well. Replace your fuel filter if you haven't done so in the past 2-3 years.
Posted on Jun 23, 2008
You can purchase the wiring diagram for $5.99 from the following site: http://www.wiring-diagram.com/. You can also purchase a wiring diagram book from the following link: http://cgi.ebay.com/ebaymotors/2008-FORD-CROWN-VICTORIA-MARQUIS-WIRING-DIAGRAM-MANUAL_W0QQitemZ120394723100QQcmdZViewItemQQimsxZ20090320?IMSfp=TL090320147007r15080.
Hope this helps,
Posted on Mar 23, 2009
and check out pages 156 - 161. They provide all you have asked for!
Posted on Oct 11, 2009
I HAVE HAD THE SAME PROBLEM ON SEVERAL CROWN VICS I HAVE WORKED ON ,& SOME OF THEM A SET OF PLUGS STOPPED IT,AND SOME OF THEM HAD TO HAVE 1 OR MORE COIL PACKS REPLACED, BUT THE PROBLEM THAT I FOUND THAT IF PLUGS & ALL COIL PACKS HAD BEEN REPLACED,AND IT WAS STILL IN THE IGNITION, IS THE WIRES GOING INTO THE PLUG ON THE COILPACK UNDER THE INTAKE TUBE, IF YOU REMOVE THE INTAKE TUBE,LOOK CLOSE AT THE WIRES FOR ANY BARE SPOTS,& LOOK AT THE BOTTOM OF THE INTAKR TUBE IF YOU CAN SEE WHERE IT HAS RUBBED IT,IT IS ALMOST A GIVEN THERE IS A BARE SPOT OR CRACKED INSOLATION ON THE WIRE, ENOUGH TO CAUSE A MISFIRE, (FYI) IT TOOK ME MANY TIMES OF INSPECTING BEFORE I LOOKED CLOSE ENOUGH TO SEE THE BARE SPOTS, BUT ALL YOU HAVE TO DO IS STRIP THE HARD PLASTIC AROUND THE WIRES BACK ENOUGH TILL YOU SEE GOOD CLEAN LOOKING WIRE,THEN SEPERATE THE WIRES AND IF YOU HAVE LIQUID ELECTICAL TAPE USE THAT AND THEN TAPE THEM WITH ROLL ELECTRICAL TAPE ,BUT IF YOU TAPE THEM UP GOOD SO WHEN THE WIRE IS BENT ENOUGH FOR THE INTAKE TUBE TO CLEAR ,& YOU CANNOT SEE THE WIRES GOING IN TO THE PLUG WITH A ROLL OF ELECTRICAL TAPE THAT WILL WORK TOO, I HOPE THIS TRICK WILL WORK AS GOOD FOR YOU AS HAS ME ON DOZENS OF CROWN VICS, ESPECIALLY P71 POLICE CARS.
Posted on Dec 05, 2009
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