Engine Performance problem
1995 Nissan Altima 4 cyl Front Wheel Drive Manual 140000 miles
I am having a problem with my 1995 Nissan Altima. It started out wanting to stall when I was out driving and would push in the clutch when coming up on a stop sign. Then it wouldn't start back up without pushing down the accelerator a little bit. It seemed like it was having a hard time going from the normal mode back to the idol mode and it was letting the idol drop to low which was making it stall every time you came up to a stop sign. I replaced the fuel filter thinking it was starving for fuel but that didn't seem to help. I bumped the idol up 100rpms and it kept it from dropping so low when pushing in the clutch when coming to a stop that it seemed to be ok for about a week although I knew this was not the root problem. Now it has gotten much worse. It runs very rich and idols very roughly at only about 500rpms. When I unplugged the MAF it idled much better so I bought a new MAF sensor and it still does the same thing. The error codes that were pulled from it were for O2 sensor and a misfire on #3 cylinder. I replaced the rotor button and distributor cap (not that I thought that was the problem, but when I pulled the cap off there was some corrosion so I just replaced them, no change in performance) Also, if I take the break booster line off it actually idols better with the vacuum leak (i guess it would since it is idling so rich but I was just doing that to see if it was a vacuum leak) which makes me wonder if there could be a line somewhere plugged that is not allowing it to get enough air? What is telling it to dump so much extra fuel? Could it be an O2 sensor or a stuck injector? I don't think it is a fuel injector since it idols so much better with the MAF unplugged. Is there another place to plug into the computer at other than under the dash right next to the fuse block (looks like obd2 hookup there)? My friend has a " snap-on" computer and it calls for a Nissan 2 adapter which does not fit the plug under the dash so I was wondering if there was another plug someplace that we can't find?
All replies will be appreciated. Thanks
Monday, January 11th, 2010 AT 3:35 PM