240sx Low RPM Hesitation - Page 2 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

kholistics23 · 01-28-2012, 03:02 PM

Quote:

Originally Posted by Croustibat

Yes. but it does not mean that if they tick, they work correctly.

If it gets stuck open, or has a different flow/latency, it wont show.

Anyway his injector is working as the problem only shows on low rpm. An injector that does not "tick" means the cylinder is eithem empty or hydrolocked, so he would be running on 3 cylinders either way.

If it comes from injector replacement, my bet would be on the injector O-ring. At idle there is a lot of vacuum so unmetered air could enter there.

these orings are worth a couple of $ .

Just wondering.. don't call me a noob, but why is it that when the car is warmed up my car doesn't hesitate as much anymore, but still have the hiccups on the idle though. But when its cold it hesitates so much that I bounce around inside sometimes. Especially on first gear.

kholistics23 · 01-30-2012, 03:48 PM

so i recorded a video of how it acts. so if someone can help me out or something. 240sx Problem - YouTube

Croustibat · 01-31-2012, 02:28 AM

Quote:

Originally Posted by kholistics23

Just wondering.. don't call me a noob, but why is it that when the car is warmed up my car doesn't hesitate as much anymore, but still have the hiccups on the idle though. But when its cold it hesitates so much that I bounce around inside sometimes. Especially on first gear.

I cant say. Diagnosinc when being 8000km away is hard, i gave you the most common reasons for your problem based on what you told here.

If you had an AFR gauge and a wideband sensor, you could see what your fueling looks like, but you dont have that and it will be cheaper to just change the fuel pump and filter.

I cant hear the sound of the video (i am at work) but your idle speed looks awfully low to me. Is it usually that low on KA engines ? If it can keep that idle speed, there should be no boost leak (it either causes high idle or engine stall).

If your fuel pump is still the oem one, start by replacing it and the fuel filter.

Also check your temp sensor, idle should be accelerated when cold and it does not look accelerated at all.

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01-30-2012, 03:48 PM	#32
kholistics23 Join Date: Oct 2011 Location: West Covina Age: 28 Posts: 47 Trader Rating: (0) Feedback Score: 0 reviews	so i recorded a video of how it acts. so if someone can help me out or something. 240sx Problem - YouTube