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

Go Back   Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum > General > Tech Talk > S Chassis

S Chassis Technical discussion related to the S Chassis such as the S12, S13, S14, and S15.

Thread Tools Display Modes
Old 07-09-2013, 06:41 PM   #1
Leaky Injector
Join Date: Aug 2007
Location: Buffalo, NY
Posts: 50
Trader Rating: (3)
1989RHS13 is an unknown quantity at this point
Feedback Score: 3 reviews
Odd Fuel Leaning out issue

Hey Zilvia! Here's the low down. I have an 1991 KA-T coupe. Lately i've been noticing something that is becoming more increasingly annoying with it. Day driving (lights off, Rad fans on) is perfectly fine. My AFR's are where they are supposed to be, yadda yadda. BUT here lies my problem. At night (light on, rad fans OFF this time), while holding the throttle steady (say on the thruway) my AFR's gradually decrease, like 14.7-15.2 then lower to 15.6-16.8 and eventually 16.8- --- full lean on my gauge. Then if i step on it and boost for a few seconds, it'll stay at proper AFR's for a while, and then repeat.

Now a few things i've noticed, if i turn my headlights off, the car will run fine with no leaning out issue. BUT the more electrical accessories i have turned on (ie. lights, rad fans, inside fan, fog lights) the leaning out issue happen more extremely.

I'm pretty much stumped here, but the issue has got to be either electrical, or maybe my ecu is just going brain dead.

My fuel pump is hard wired, i'm running an adjustable fpr which is functioning properly, a nissan quest alternator...i'm just trying to list things that i think may have something to do with this issue.

any input is much appreciated!
1989RHS13 is offline   Reply With Quote
Sponsored Links


240sx, fuel, lean, nissan

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT -6. The time now is 12:23 PM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2022, vBulletin Solutions Inc.
Copyright ? 1998 - 2022, Zilvia.net