OK im new to boosting my car.. and im running a in the mean time fuel setup

vortec fmu 12:1 disc...
missing link map bypass

every day or so i get a CEL....fuel metering too rich... i clear it and it runs fine for a day... then come on.....but it only seems to come on when im driving very low rpm....not ever in boost..

help me out guys.. someon has to have experienced this once before




Modified by pornstarSR at 9:45 AM 4/21/2004

 

Check your fuel pressure first.

Could be a stuck FMU.

is your O2 new??

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by pornstarSR &raquo;</TD></TR><TR><TD CLASS="quote">PS and dont give me crap about the fuel setup... im only at 5psi..(with 2 psi spikes...all the sudden)</TD></TR></TABLE>

Make a note to yourself, an attitude like this will get you no where here.

 

not hard to figure out, your car is running to rich.

when you are at low rpms and not boosting your car is getting too much fuel. better to be rich that lean. i'd leave it.

 

I think it's your suspension.

(well you didnt' want to hear that it's your fuel setup....)

-PHiZ

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PHiZ &raquo;</TD></TR><TR><TD CLASS="quote">I think it's your suspension.

(well you didnt' want to hear that it's your fuel setup....)

-PHiZ</TD></TR></TABLE>

haha, owned

 

i got a cel for not having enough fuel once (i scaled for 450cc injectors twice on accident using uberdata)

 

dude you guys all took that the wrong way...

what i didnt want to hear was....."ditch the fmu" as an answer...

but yeah im running rich.... it just popped on on the way home...cruising at light throttle....

i was under the impression that the fmu didnt do anything till it saw boost...

but it could be stuck... ill have to check that..

02 sensor is new

yeah ill check my suspension...it could be doing it..

 

The ECU looks at O2 sensor input to adjust the Short Term and Long Term Fuel Trim values.

So basically, you're either really running that rich at partial throttle, something is up with your O2 wiring or the O2 is just tired/clogged up from running so rich.

You say O2 is new....how long after you were initially boosting on the old O2 sensor did you get this code...or did this code pop up from the use of the new O2?

 

ive been boosting for about 5 days...

02 worked fine on the NA setup...

wireing has never been touched (meaning no A/F ratio gauge)