Mr_ET

I am puzzled by the way the car idles after startup when already warm.

It will idle very low around 500rpms AF ratio is around 20:1 and of course it wants to die. Let it idle like that for about 2 minutes and it comes back to normal and idles around 14.5-15.

Another problem, probably related to this one, is that sometimes when I stop at a light and rev it to go after it turns green the car will either bog for a quick second 8:1, 9:1 AF and then go or just completely die there. This also does not happen all the time.

Could this be a problem with a vacuum line or the o2 sensor?

I can take some pics of the vacuum line setup tonight if you guys need.

Mr_ET

any help would be appreciated

0mtber

iTrader: (2)

Have you had the car tuned yet ?
If not, sounds like you need to...

Sprockets

iTrader: (6)

I have the same problem, although I don't have a wideband hooked up. Replacing the fuel pump and filter didn't solve the problem, so I'll try a cap and rotor next. When I pull up to a light, rpms drop and the car might die. If I rev the engine while backing up, because I don't want my 6 puck clutch to shudder, the car might die. It's annoying.

Mr_ET

car is street tuned and the turbo edit map used to idle a friends car with the same engine and injectors just fine.

I am sure it has nothing to do with the tune.

Could this have anything to do with the IACV?

Yesterday when I did a cold start it idled really really rich like 8,5:1 - 9:1 for about a minute and settled.

If the tune is constant which it is how could my idle be so rich and then so lean all at idle?

fastcrxsi90

i assume your running closed loop except in boost....therefore when you first start the car your running off the fuel map, and when it warms up your afr is adjusted by the nbo2.

if you run too lean at startup most of the time, i would richen up the map around where you idle...and let the nbo2 adjust for the rest of the map until you figure it out.

i dont know why you would get variations from 20afr to 9afr depending on the day...

dbiker207

sounds like a bad idle tune. what happens is the vaccum flucuates and ecu starts reading off a different cell in the map. do you have dataloging with map trace? if so turn on the map trace and adjust the cells around the top left of the map so there is only small differences.

Mr_ET

I'll have a look at that. The car has always been harder to start since it's been running the 450's and the chipped ecu.

the really rich condition only happens at cold starts
the really lean only happens during warm starts

both last at most 2 minutes and then it idles fine.

when I leave at a light it will also sometimes dip down to really rich and either bog or die. Could this also be because of the tune between 1000-1500rpms being too rich or would this have to do with some type of leak or o2 sensor malfunction?

thx for the help guys appreciate it!

Mr_ET

bump for some help could lowering the cold start fpr of 45psi in Turboedit help it start more positively and make it idle right during warm up?

blackeg

its in the tuning. on occasion when tuning with uberdata if my car was jjust a little bit rich or a little bit lean at idle, it would go like off the scale. kinda why i just said *** it and set the idle to like 13.8:1 when hot. no lean starts no super rich starts.


it also has to do with how the tuning program uses and corrects for the iacv and coolant temp

JDMisGOOD

It's definately in the tune.

bch5428

ive had the same problem with my car, tuned on TE. it fluctuates while idling from ~12-17:1 afr. its really annoying. i tuned the car previously, had the idle perfect and put in my other motor and it idled horribly.

ive gone through two IACVs, altered cold start fuel pressure, and even turned the idle up, it still idles low around 500rpm and surges; sometimes. still trying to figure it out.

b20beast978

good thread...im havinf teh same issues. At starty up motor runs lean but then runs bit rich after that. AT stop light car feels like it wants to die when it goes under 1k rpms...

bch5428

thats my TE fuel table thrown into excel.

dbiker207

try lowering e1-e5 to 2.75, e6-e7 to 3.00, lower f1-f5 to 3.30, and f6-f7 to 3.60. then check idle a/f. if its off highlight cells b1-f7 and +/- a percentage for the entire area. i think whats happening is the map is switching between column d and e or e and f at a given rpm.

mrbsponge

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr_ET &raquo;</TD></TR><TR><TD CLASS="quote">car is street tuned and the turbo edit map used to idle a friends car with the same engine and injectors just fine.I am sure it has nothing to do with the tune.

Could this have anything to do with the IACV?

Yesterday when I did a cold start it idled really really rich like 8,5:1 - 9:1 for about a minute and settled. <U>again----&gt;the tune</U>

If the tune is constant which it is how could my idle be so rich and then so lean all at idle?</TD></TR></TABLE> <U>because its not set up properly</U>

JaredKaragen

it isn't hard to tune out the cold start-up once the car has a decent tune...

in crome it a pretty simple adjustment.

Mr_ET

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mrbsponge &raquo;</TD></TR><TR><TD CLASS="quote">[/B] <U>because its not set up properly</U></TD></TR></TABLE>

Would providing my fuel map on a xls doc help you guys see why my car is doing that?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JaredKaragen &raquo;</TD></TR><TR><TD CLASS="quote">it isn't hard to tune out the cold start-up once the car has a decent tune...

in crome it a pretty simple adjustment.</TD></TR></TABLE>

would you be able to describe how you do it in Crome? Maybe some of it will resemble what I need to do in TE and give me an idea

dbiker207

post up your .bin file and i will take a look

Mr_ET

could you guys help me post it here I have never posted a file

or should i just take a printscreen of it?

mrbsponge

yes post up a shot of the low cam map not just fuel but timing as well,

and judging from the use of turbo edit, im guessing the car is OBD-0 right?

Mr_ET

obd 0 sohc zc non-vtec I will send dbiker207 my bin tonight so hopefully he can share it with you guys.

bch5428

nice. im interested in your results.

all go teg

my car is doing the same thing. it starts up fine, then idles lean and every time i come to a stop the car dies. i cant figure it out for the life of me.