vancouverrx7

Guys,



This morning the car had a very hard time keeping idle/won't keep idle. I fired her up four times before she kept up. I haven't had anything done to the car recently except for an oil change and that was it. What could be the matter? I'm guessing maybe I didn't tighten the oil filter, but I just checked again and it seems tight! Otherwise, could it be some tuning issue?



Current diagnostic

Starting up was fine so I wasn't really worried about the motor

vacuum pressure is about 15-18 psi at warm idle w no flux so I'm guessing it ain't a vacuum hose/leak

Car pulls like a bat out of hell

Fuel meter seems fine, no flux under heavy accel so my fuel pump/system is still good



Relevant List of Mods:

Stock Twins

1300cc sec inj

apexi computer

GReddy 2 row FMIC

Intake

Exhaust w/ hi flow cat and precat

Efini Y-pipe

Fd3BOOST

First thing that I would suspect would be the ignition coils.

Sounds to me like for some reason or other your not getting sufficient spark. Is the car flooding out now?

vancouverrx7

FD3BOOST, I don't think it's the coils or the spark plugs because the car still pulls great. I would think that if it were the plugs or coils, she would drive sloppy. However, I do share your concern that maybe my primaries are leaky and thus they're flooding on me... But aside from pulling the plugs out to check if she's flooding is there another way? I'll be kinda pressed for time the next few days and she's my daily driver.



Also, I had forgot to mention last time that I'm hearing a strange electronic hum coming from underneath the intake manifold when the car stalls. In other words after the 2k idle for a cold start and the car stalls, I hear an electrical hum coming from the engine bay. I pop the hood to see where it's coming from and it sounds like it's directly under the intake manifold. What could this be?

pengaru

i'm guessing the temperature has dropped recently? you might have to tune the post start / coolant correction maps.

vancouverrx7

aye... that was also my second thought... but I've always left tuning to KDR or someone else who knows more about it than I do... so I guess it's either a trip out to KDR or get my local mechanic to do it... Unless someone else cares to give it a shot?

vancouverrx7

I was thinking about the coolant correction map...



On the APEXI Commander, when I go into water temps, I see the temperature in one column, and 2 other columns with numbers... What are the other 2 columns?



I remember Dave at KDR mentioning something about bringing up/down one of the columns to adjust for rich/lean fuel mixture... but I forgot and can't find where I left that sheet of instructions!