sr20 Running Problems - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

jacobs13 · 02-11-2011, 02:42 PM

Ok so i swapped in my s13 blacktop into my s14 and I ran into a few usual problems but everything seems to be right but one thing. When I start the car it usually starts up ok, but the idle will drop and and when I give it gas if I hold it at 2000 rpms it will drop on its own when im not moving the pedal. In order for it to stay running I have to keep pumping the throttle. I also hooked up a boost guage and when its sorta idling the vacuum is at about -17psi which is normal but when it the idles for a about 5 seconds with me lightly feathering the throttle it will drop to about 10 and when I rev it all the way it only shows 0psi but it blows off loud, So I was thinking vacuum leak but I cannot source any. Now when I drive the car it will be ok untill about 2k then it breaks up boggs and backfires. Ive been trying to fix these problems for about 2 weeks. I had alot of electrically problems but I think I got all those out of the way. My last 3 ideas of what the problem might be are timing, vacuum leaks, or fuel pressure. What do you guys think? And I have searched but no one really said anything about how the rpms drop when I keep the throttle steady. Any help is appreciated.

Thanks guys

jacobs13 · 02-14-2011, 08:42 AM

Ok so I got it to run to where I can drive it, when its cold and I hold the throttle at 1/4 or anywhere else the rpms will keep dropping down till it dies, but it doesn't do it when its warm. Also when its cold if I put any load at all on it it will die now matter how much I rev. When its warm I can only give it really light throttle otherwise it will bogg/sputter. Anyone know where should look next? I need some help and this is my dd.

02-11-2011, 02:42 PM	#1
jacobs13 Zilvia FREAK! Join Date: May 2009 Location: Long Beach Age: 29 Posts: 1,061 Trader Rating: (27) Feedback Score: 27 reviews	sr20 Running Problems Ok so i swapped in my s13 blacktop into my s14 and I ran into a few usual problems but everything seems to be right but one thing. When I start the car it usually starts up ok, but the idle will drop and and when I give it gas if I hold it at 2000 rpms it will drop on its own when im not moving the pedal. In order for it to stay running I have to keep pumping the throttle. I also hooked up a boost guage and when its sorta idling the vacuum is at about -17psi which is normal but when it the idles for a about 5 seconds with me lightly feathering the throttle it will drop to about 10 and when I rev it all the way it only shows 0psi but it blows off loud, So I was thinking vacuum leak but I cannot source any. Now when I drive the car it will be ok untill about 2k then it breaks up boggs and backfires. Ive been trying to fix these problems for about 2 weeks. I had alot of electrically problems but I think I got all those out of the way. My last 3 ideas of what the problem might be are timing, vacuum leaks, or fuel pressure. What do you guys think? And I have searched but no one really said anything about how the rpms drop when I keep the throttle steady. Any help is appreciated. Thanks guys

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02-14-2011, 08:42 AM	#2
jacobs13 Zilvia FREAK! Join Date: May 2009 Location: Long Beach Age: 29 Posts: 1,061 Trader Rating: (27) Feedback Score: 27 reviews	Ok so I got it to run to where I can drive it, when its cold and I hold the throttle at 1/4 or anywhere else the rpms will keep dropping down till it dies, but it doesn't do it when its warm. Also when its cold if I put any load at all on it it will die now matter how much I rev. When its warm I can only give it really light throttle otherwise it will bogg/sputter. Anyone know where should look next? I need some help and this is my dd.