I have a Altima with over 200,000 of trouble free driving, thats all changed in the last couple of thousand. It started on a ocasion to sputter at low rpms but would cruise with no problem and would accelerate fine. Slowly the sputter turned to stalling. Now it acts like its starving for fuel and bogs out if you don't feather the throttle. All of this has been intermitted till a couple of weeks ago. I've tested all of the sensors, replaced just because the MAF, temp sensors, coil, distribitor, TPS, 2 sets of wires and plugs, new rotor cap and rotor, fuel filter, fuel injectors (4) new, and all gaskets for the head up, cleaned and inspected all of the hoses above and below the intake manifold, checked the power steering sensor. My distribitor had no oil in it. Checked and cleaned the grounds from the battery to the engine and body. Inspected all of the related fuses and relays for contact. The computer flashes a 55 code and my odbII scanner dosn't pickup any codes or pending codes. In the monitor mode it shows the timing advancing from a low of 20 degrees to about 38 will driving, throttle position moves from 0% to 50 or 60%. 02 sensors are producing the correct voltage, vaccume averages about 20 inches, fuel pressure at idle is 38 psi and about 43 at cruise. I,ve taped the fuel pressure gauge and vaccume gauge to the window along with several feet of clear line so I could see the quality of the fuel stream. Everything appears perfect and within specs but the darn thing will die in its tracks with all instruments reading OK. PS, weather seems to have no effect on it.

Its been a few days since I wrote the above message. Now I have repaced the computer with no improvment. I have found one thing that may be involvedm, the TBS. I replaced it last week as I wrote above, while attempting to figure this out I disconnected the TPS and found the engine will rev without bogging out or sputtering??? I plugged the old TBS in and manually rotated its shaft to about 80% open and found the engine runs and idles perfectly. It seems like its about 45 degrees out of phase. Also when I checked it with the volt meter while its mounted on the throttle body I could get only about 50% of the meter and could get about 90% of a reading while manually rotating the shaft. Both TBS read the same. Any thoughts?

G O B

 

Did you have any luck with this gob? I've had 3 trips to the garage and $900 later they are no closer to working out the problem. Happens intermittently but will sputter at low revs, hot or cold and also surge on occasions too.

 

im starting to have this problem on my 99 altima also. any ideas?