S14 sr20 sensitive to weather?

Discussions concerning the M7790 cpu

Moderator: Matt

Post Reply
chau
 

Posts: 4
Joined: Tue Nov 01, 2011 11:48 am

S14 sr20 sensitive to weather?

Post by chau »

I had my car tuned in mid June and it was running perfectly. High 10 to low 11 AFR at wide open throttle. Last week while running some logs, it's now running 12.9-13.5 AFR at wide open throttle. No vacuum leaks as far as I can tell. Do you guys also experience this with changing weather? Also, I live in the northeast so it's much cooler now compared to 4 months ago.

Edit: I'm running a Z32 MAF.
Fast Guy
 

Posts: 27
Joined: Sat May 12, 2012 3:25 am

Re: S14 sr20 sensitive to weather?

Post by Fast Guy »

Have you checked your fuel pump voltage/pressure? It's now running leaner so might not be getting enough fuel.
Matt
Site Admin
 

Posts: 8961
Joined: Sun Jan 29, 2006 1:45 am
Location: Adelaide, Australia
Contact:

Re: S14 sr20 sensitive to weather?

Post by Matt »

MAF measures ambient temperature when offsetting against amount of airflow cooling the hotwire so that is taken into acccount. If the MAF is measuring lean or you have some other fueling issue (like fuel pump measured above) then it may be this

Also check your AFR trimmings (AF alpha gauges) to see where those are at
Post Reply