One thing that most technicians overlook when it comes to setting monitors is that the ecu needs to be ready to accept the input from its sensors in order for it to run its test. This basically means that if you have a full tank or near empty tank of gas, the ecu will never run a evap test. A non functioning iat sensor may not set a code but will prevent certain tests as well. Cat and o2 switch rate/response are always the last to set because of the time it takes the ecu to monitor its functions to determine if its working correctly. Did the monitors ever set with the new ecu? Although its much cheaper, I never recommend used ecu's on anything obd2. The car might function fine but this is usually a issue you run into later on. A lot of car manufactures have different ecu's or calibrations for different parts of the country or world. If you have a ecu or calibration that was for a "different" market it may be looking for something from one of the sensors that may never happen in order to start tests. I do see this quite often. It usually doesn't takes much to set monitors on a 97 car or truck. If its not setting at all, you need to look at the data the ecu is seeing to see if its all correct. If it is and you have miles on it, your probab;y better off getting another ecu. Raj
In a message dated 9/17/2008 1:24:09 P.M. Eastern Daylight Time, [EMAIL PROTECTED] writes: I'm having a devil of a time and I'm hoping the list can help me. Car: 97 w/ 99 motor. I normally run the Link, but had to swap the stock ECU back in for emissions. I swapped ECUs a month ago for my e-test that has a deadline of this friday. I just took the test and failed in order to get the 1 year extension. So here's new stuff. Some of this has been added over the course of the last month in an effort to get monitors to set. New front o2 sensor. I recycled a 30k mile old o2 to replace my original 125k stock rear o2 sensor that I thought might be "tired". new plug wires (it was time), new-ish magnaflow cat (about 6 months since putting that in). Car runs fine. Not as smooth as with the Link, but fine. It REFUSES to set the o2, cat, and EGR monitors! I've driven an honest 500 miles in various conditions. I've performed a handful of different "drive cycles" I found on Miatanet including one that claimed to be for a 97 specifically. Still nothin. I can have 2 monitors not ready in Albuquerque, but not 3. 3 is fail. Does anyone have any ideas? I never had this problem before. On a normal commute to work, this car would run and pass all tests in 2 days (4 cold-start drives). But 2 years later after running the Link, there's no joy. I just need to get ONE more test to run. I'm going crazy. thanks, Adam **************Psssst...Have you heard the news? There's a new fashion blog, plus the latest fall trends and hair styles at StyleList.com. (http://www.stylelist.com/trends?ncid=aolsty00050000000014)
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