Post by
NISTECH »
https://forums.nicoclub.com/nistech-u7581.html
Sat Nov 01, 2003 7:51 am
GOOD GOD!!! I hope shops across the contry arent pullin this sh**. go to a dealer man print the post i gave you and have one of the master techs look at the consult readings and look at my post. do not go to the nissan certified shop I doubt they have the technoligy to perform the reprogram I mentioned. Let me tell you what i do for a job and a story about how this problem was discovered. After I figured this out Every one i have repaired since has been what I call a gravy job. I have repaired myself and other guys on my team I have desigated this exact problem approximatly 40 times due to this problem. to be quite frank i dont understand why nissan has not addressed this with a TSB.
I am an engine specialist for a nissan dealership in calif. I am currently the crew leader for 5 technicians.
This problem first presented itself to me about 6 months ago. customer came in concerned his car would hang in gear and did not seem to have the horse power it use to. I road with him and sure enough above half throttle this car was a gutless wonder and it would hold at 6000 rpm before it would up shift into the next gear. so I go back to the dealership and told the customer on the way back I was familer with his problem and that there was a TSB on replacing the shift solonoid kit and that would need to be done. well one of my guys performed that job over the weekend and on monday when i came back to work the car was still there and I was told the car was still acting up. Well dog poop I thought. It acted exactly like other ones I had done the bulliten too? Except one thing the horse power problem was not a charicteristic of the others. So I check our Asist (nissan information data base) for any other possible no code related horsepower problems. Nada! So off to the phones I go to call nissan technical help desk for dealers only. well we went back and forth 3 or 4 days and none of their recommended advice helped me in resolving this problem. He ran it by the engineers down there and they also came up with nothing usefull for me. So now I am pretty much on my own here. I went to the data moniter section and seen what was on the screen. Drove it 6 or 7 times watching this stuff which made absolutly no sense what it was showing me. I evaluted all my print outs and took a shot at a ecm reprogram only just to see what would happen. well it certainly made a difference. After the reprogram and clearing self learned values my Air flow meter readings plummited and all the other readings fell in line with what air flow was doing. its voltage erratically jumped around 2.5 volts at full throttle. BANG I got a bad airflow meter and for some damn reason the ECM leaned this and sustituted its value in data moniter. Well at this point the car runs like absolute crap bogging and sputtering when accelerating. So I get the new Airflow meter (updated part number) and reprogram the ecm for the new part number and the car runs ti*s now.
Now the failure seems to have variable degrees of failure. some not so bad and some to the point of good luck gettin on the freeway. and injector msec will folow this variance but o2 readings will still follow the reading i indicated. Also I have done curiosity reasearch on the reprogram and cars drivabilty dropping off like that one did. some of them will not change on how they drive because it seems to be dependant on how bad the airflow meter actually is. And when I called techline back to tell them what i had found they swore to me there was no failsafe mode like i was seein. So it wouldnt suprise me if other dealers have not figured this out. That is why you should take my diagnostic steps i included with you. If they are good techs they will understand all the info I gave you and be able to make the repair. DO NOT let them sucker you into the trans replacement. the airflow meter is running like 120 bucks, thats cheap for an airflow