Mechanics

NEED YOUR HELP.

Nissan Altima

I have a 2003 nissan altima with a 2.5s engine automatic trans. With 94,000 miles. When I turn my engine on in the morning it does it fine, when I put my car in drive it jumps on me as if though it wants to turn off on me. When im driving down the road from time to time if feels like my car wants to turn off on me and it does sometimes but only when im coming to a stop. I changed my upstream oxygen sensor but not my downstream sensor I did a scan on it n it shows that my downstream is running lean, can this be the cause of my problem or can I be having another one, I had a trouble code p0420. I believe the the problem is with the oxygen sensor. By me letting the car run in this way can I damage the cat. Converter. Thank u 4 ur help.
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Souljahslim305
May 30, 2007.



Has it ever been tuned up? 0420 is usually a cat efficiency code, the converter may be bad if the sensor has already been changed (downstream)

Tiny
Jack42
May 31, 2007.
I have only changed the spark plugs, done oil changes every 3 thousand miles, changed the trans. Fluid. And changed the upstream oxygen sensor. Do u think that its time for me to do a valve adjustment.

Tiny
Souljahslim305
May 31, 2007.
Try cleaning the throttle bore with carb spray and a rag. Might also want to try a downstream o2 sensor

Tiny
Jack42
May 31, 2007.