OK People

[way2old]

Well we got one that is kicking us pretty badly. 2000 Crown Vic P71. When it feels like it, the coolant temperature light will come on and the engine will just cut out like the ignition is shut off. We have determined that it is placing itself in fail safe coolant mode. However, the coolant temp and cylinder head temp are working properly. All scan data looks normal. Nothing out of the ordinary. Vehicle came ion for small fire under the vehicle and we determined it started from something on top of converter on drivers side. All sensors work normally and the PIDs are correct. Fuel pressure is dead on the money, new plugs. The only thing that comes up is the OLDRV(not OLD RV re-tired ) I am assuming that is something that controls open loop fuel in the vehicle. I have never seen it and can't find acronym for it. Soooooo, if anyone has any bright suggestions, or just suggestions(for you re-tired), they are more than welcome. Next step is to check wiring to see if anything is out of whack there. Thanks all.

UPDATE: just left vehicle. Did about 3 almost wide open throttle stomps in the bay. Check engine light came on and then car died. Lost all communication with PCM while this occured. Unplugged power relay and plugged it back in.--had power. Stomped it again--check engine light came on, no power to scan tool no start. Turn key off and started right up next try. Somewhere there is a gremlin that is laughing real loud. Keep ya informed. At least we have it narrowed down to electrical. Oh, also no codes.

[DanD]

Where are you getting that acronym from, I’ve gone through two or three lists and can’t find it anywhere?
The only thing I can think it may stand for is open loop driver, which I’ve also never heard of?
I would be doing the same as what you’re thinking of doing that’s to go through the harness. Your guys may have repaired all of the visible fire damage, but if a couple of wires shorted during the fire you may have a couple of wires fused together farther down the loom.
Man am I glad it’s not my job, scary to think of the time that may go into finding something like this.
Good luck to you Tom let us know what you find.
Dan.

[way2old]

I couldn't find it in any Ford source I have either. It came off a Nemesis scanner with manufacturers enhanced data. I will be sure to let ya know, and believe me, i WILLNEVER forget the fix.

[way2old]

OK all. We found the problem. It was circuit 915, pink and light blue wire going to the PCM and DLC.(Multiplex wiring system) Ford's famous wiring harness under the battery had corroded the wire where there were only a couple of strands left and the torque of the motor was causing it to lose power. only got about 14 hours in this one. Glad we are not on flat rate.

[DanD]

That’s great you guys found the problem and it must feel quite satisfying that the car didn’t beat you. Like you said though; you’re not on flat rate; can you imagine walking up to a customer and presenting a bill for 14 hours to fix one corroded wire. We both know that it can take that long to find but I still have a problem convincing a customer. They look at you as if you have two heads; thinking why couldn’t you find it faster. I can almost guarantee you that they think we’re fleecing them for the time.
That is also why I think a thread like this is so beneficial for the general public to read.
YES IT DOES TAKE TIME TO FIND THINGS LIKE THIS, WE DON’T HAVE EXRAY VISSION AND WE CAN’T SEE A MILLI VOLT VOLTAGE DROP ACROSS A CIRCUIT WITHOUT A METER CONNECTED TO THAT SPECIFIC CIRCUIT.
WE DIDN’T DESIGN, BUILT OR BUY THESE VEHICLES; WE’RE HERE JUST TRYING TO REPAIR THEM. Well after warranty I mite add; there are no TSB’s for a car off warranty.
This is a feather in your shops cap Tom, feel proud.
Dan.

[way2old]

Thanks Dan. Called the 3 local Ford dealers and they all said the problem was a bad coil that was causing RF interference. I asked them if that were the case, wouldn't the Police radio do the same thing when keyed? They had no answer for that. Thanks for the moral support and for being here for us.

[re-tired]

way ta go tom . I figured it was somewhere between the bumpers. ;D