Mechanics

TRYING TO PASS EMISSIONS

2004 Ford Crown Victoria • V8 2WD Automatic • 1,115,000 miles

2004 Ford Crown Vic P71, sensors not ready to test Catalyst and EGR. Have done Drive cycle routine from ford, NO GO. Have reset computer and then done Drive cycle routine NO GO, Drove vehicle over 1500 miles still NO GO. The computer keeps saying sensors not ready to be tested, any suggestions?
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BCdkar
January 17, 2011.



The possibility might be that there is something in the drive cycle that has been overlooked. The drive cycle is supposed to be an OBDII standard and I have found that different car makers intepret this several ways, some will not allow the engine speed to exceed a certain value while others approach it as a "this needs to occur before this monitor will run to completion" while others are quite strict about certain input values such as coolant temperature or a sensor out of range. It may also be due to a software issue within the control unit, being a BMW specific technician, I have seen this in certain 4 cylinder BMW cars, it required the replacement of the engine control module. As to your problem, the message is as I read it, the 2 monitors that do not complete are the EGR and the Cat, in California, there is a allowance for no more than 2 monitors to be incomplete and still allow testing to be successful. The 2 that you state are the 2 that require a particularly long trip that is not interrupted and may also have something to do with a malfuntion of the EGR system. Is there more information available? Have you talked to Ford?

Dr. Hagerty
Jan 17, 2011.
I followed the FORD drive cycle to the letter 3 times then after that diod not work I decided to try resetin everything and doing the drive cycle, that did not work. Went on a trip drove over 900 miles in about 3 days time multiple starts when destination was reached and then except for the occasional bathroom gas stop It was a straight drive. Still no go. I talked to ford they have no idea, But they will be glad to bring it in and take a look at it for standard labor rate! I replaced 2 O2 sensors and than drove around normal stuff for a week still no go tried drive cycle again still no go, Last thing done was another weekend trip that was 365 miles one way and 300 of those was driven straight thru on the way down on the way back we stopped at some sites. The car runs and drives great no problems at all that I can see, there is a small dead spot I noticed last night in the gas pedal but its hardly noticable at all but it is there don't know for how long its been there. The problem is Illinois will not pass unless ALL sensors are ok so that kinda bites. I also Do not have a lot of money to throw at the problem it all kind of hit at a slow point in work. I have been out an additional 20 bucks buying 10 day trip permits for which I can only get 1 more of this year for this car! I Did check the EGR valve and tube and it all appears good with 0 blockage in the pipe.
I should also mention that I know how to and do work an all my vehicles including my 7.3 diesel so I am not afraid of getting dirty but I have no where to turn and I am not going to start throwing parts at it. One last thing as I knwo this is a rambling post, I did talk to a police car mechanic and he talked to another guy and according to them the car needs to be driven. That is the only answer I get from anyone it seems. If it turns out to be something real expensive I am just going to register the car in my bros name at my house and at least I will get a year or 2 of driving into it before it has to be tested.

Tiny
BCdkar
Jan 18, 2011.
Great feedback my brother. I will be talking to my friends that work on the police fleet too, other than what is on the page now, I dont have anything to add. I will bookmark the page and return with something when it shows up.

Dr. Hagerty
Jan 18, 2011.
Is there anyway you can get a reading of all the sensor values and post them here? By seeing what the sensors are doing may give us some insight as to what may be the underlying problem.

Tiny
Way2old
Jan 19, 2011.
That is an excellent request, I second it.

Dr. Hagerty
Jan 19, 2011.