today i noticed my cars check engine light was on, i also noticed it seems to run better (more responsive)

i checked the codes and found out i didnt put gas cap on all the way - reset gas cap (but didnt reset code)

after abt 2-3 cool-down/warm up cycles the light turned off - and performance was back down to what i was used to

anyone have any thoughts on this??

1997 Camaro SLP LT4
E85 conversion
dyno tuned

 

What was the specific code you had when the SES light was on?

 

442
and
1416 (i just deleted 1415 and 1416 via LT1_Edit)

if it matters this is a speed density tune w/ no MAF (pcm programmed for this)

 

Probably because the fans were always on. Makes the motor run cooler.

 

thats not it..cause i have a SLP fan override switch and tried that before
even when the car reached 175deg (where it normally runs at) it felt like it had more pull with the CEL on

maybe something abt being stuck in open loop?? thought the dyno tune would be better than preset non-feedback open loop????

 

You need some fine tuning to your tune..possibly running lean with the ses off.

 

does it run richer when the SES light is on? if so, how can i richen it up via LT1_Edit?
via VE or PE tables? or both? neither? something else?



i know E85 likes rich

 

None of my lists show P0442 as a valid code for the 97.

 

What fuel pressure are you running with the E85?

 

according to my snap on MT2500:
P0442 Evaporative Emission Control System Leak Detected (small leak)

 

got a BG alky pump that is 200gph, 150psi
the regulator was set to 60psi during dyno tuning

 

i caused another 442 error - SES light came on.. and i raced my neighbors cobra 2 times - then i reseated gas cap - after 2-3 cooldown/warmup cycles the light went off and we re-raced 2 times

with the SES light on i had him by 1 1/2 car
with the SES light off i had him by abt 1/2 car (his front bumber even w/ my door mirror)

his car: 2004 cobra, dyno tuned, pulley, LT headers & catback, 445RWHP

(just to make sure i want mental when i thought car had more pull)

 

Maybe I need to set my SES light on. LOL But really it sounds like it's a fueling problem. With alcohol different temps require diffenret fueling requirements alot more than gasoline so your tune is must be off a little. So when the SES light comes on it goes rich, which helps out your fueling problem. I would have the car retuned at the dyno and add more fuel to see whats going on.