Help diagnose my ka problem. Stumbling/hesitation under wot - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

naed240sx · 04-18-2008, 02:04 PM

Its not timing. I'm convinced that it is some sort of air metering/vac leak/etc problem because of the effect that the idle screw has on the issue. Can't be timing because it was fine a week ago and had tons of power. It's a really jerky, popping, stumbling sort of problem.

naed240sx · 04-18-2008, 02:27 PM

Video showing how stable and smooth revving is...followed by hard throttle stabs. Listen to the way the throttle hits sound. To quote my friend, "it sounds like it farts"

http://s180.photobucket.com/albums/x...t=MVI_0328.flv

EDIT: video that shows the stumbling better:
http://s180.photobucket.com/albums/x...t=MVI_0326.flv

This was all just done parked, but the sound is similar and the problem persists with the car in gear.

naed240sx · 04-18-2008, 09:24 PM

After driving to the parts store, the car wouldn't start. At this point I realized I was wrong and that it must be electrical related. Replaced the alternator and now it runs like a champ.

04-18-2008, 02:27 PM	#2
naed240sx Zilvia Member Join Date: Jul 2005 Location: Houston, TX Posts: 206 Trader Rating: (0) Feedback Score: 0 reviews	Video showing how stable and smooth revving is...followed by hard throttle stabs. Listen to the way the throttle hits sound. To quote my friend, "it sounds like it farts" http://s180.photobucket.com/albums/x...t=MVI_0328.flv EDIT: video that shows the stumbling better: http://s180.photobucket.com/albums/x...t=MVI_0326.flv This was all just done parked, but the sound is similar and the problem persists with the car in gear. Last edited by naed240sx; 04-18-2008 at 02:53 PM..

04-18-2008, 02:04 PM	#1
naed240sx Zilvia Member Join Date: Jul 2005 Location: Houston, TX Posts: 206 Trader Rating: (0) Feedback Score: 0 reviews	Its not timing. I'm convinced that it is some sort of air metering/vac leak/etc problem because of the effect that the idle screw has on the issue. Can't be timing because it was fine a week ago and had tons of power. It's a really jerky, popping, stumbling sort of problem.

04-18-2008, 09:24 PM	#3
naed240sx Zilvia Member Join Date: Jul 2005 Location: Houston, TX Posts: 206 Trader Rating: (0) Feedback Score: 0 reviews	After driving to the parts store, the car wouldn't start. At this point I realized I was wrong and that it must be electrical related. Replaced the alternator and now it runs like a champ.