lean sr

[surfer240]

im having a problem with my accelerating afrs they are way lean i jus got a wideband thinking i was gonna be on the rich side of the scale.... if i didnt have my wideband it would have been over! my f/p is fine 46 vac unplugged 36 otherwise raises when pedal applied, timing is on point... as soon as i give any throttle it goes from a 14.6 crusin to at least 15.1 at wot!!! ill feather the gas and when i go into it it leans. here is the kicker tho its on stock boost with a toob manifold, intake, exhaust and a walbro pretty much stock. checked for vac leaks had one under the tb nipple on left... had my vac gauge hooked up to my fpr line took that off, swapped my sr fpr for my friends ka24 fpr are they the same? didnt change anything anyways... one thing i did notice is if i have my key in the fuel pump wont shut off like it used to after a few seconds i checked my f/p and i hear it leaving the fpr but the fuel pressure is stabil on the gauge why would the pump stay on like that?

[compactfean]

So let's address issue #1. I hate to be a d!ck but I gotta ask. Did you calibrate the wide band in the car or out? If you do it with the sensor in your readings will never be right. Also do you have any data logging tools? Check your maf voltage and see if you are getting up to about 3 to 3.5 volts. When you start getting on it.

[surfer240]

thats not being a d!ck yes it was calibrated in open air maf voltage is good i think its at about 9V with key on when disconnected.. car runs rich when diconected 10.5 afrs breakes up under load but runs fine with it plugged up. tps at .5 idle and 4.05 at wot... voltage to walbro fuel pump is 12.7 car on and running 11.4 with jus the key on. injectors and coils fireing disconnected one at time to see if it changed it did for every one. any other suggestions welcome

[surfer240]

bump

[surfer240]

bump

[surfer240]

my fuel gauge has been acting up lately,my fuel pump doesnt stop priming and maybe isnt putting enough fuel to the rail at times.... fuel sending unit maybe? and if so i cant find one for sale online and junkyards around here have no 240's

[surfer240]

It went away for a while and now its back wtf!!! Ok I checked my walbro fuel pump voltage it was higher tham my friends ka-t about 12.5 volts... I pinched the return on my adjfpr it raises to 75 psi very quickly it's a 1:1 btw I have my fp set to 39 psi bumped up from stock 36 40 something with the vac unplugged didn't do anything. still uber lean I don't have data logging tools cuz it's a stock motor and ecu all I have is fmic exhaust a ss tubular manifold adj fpr 1:1 r/r .... I do have the nipple under the tb the one on the left plugged cuz I took out my charc canister the car runs great tho I don't drive it hard at all to scared I seen a 13.9 goin up the bridge in third wot to see wat it was doin no good!! Timing is at 15 degrees I jus don't understand how it can be so lean with the fp up so much on stock boost like 7-8 lbs...

[surfer240]

Bump no one knows why a stock sr w good fp and a walbro would run lean cts maybe? Anyone know how to troubleshoot the cts?

[surfer240]

Ok it took a long time to figure this out and I know there is a few people with the same problem.... So I figured out that it was my intake flows to good allowing more air than the stock air box hence stock tune.. I put a apron over the filter witch allowed less air into the motor. It seems to have worked! My Afrs are like 10.5 at wot never seen that since I had my wideband in. even bumping up the fp to 40 psi I was seeing afrs in the 13 range witch was jus not cutting it. I seen people use this method to pass emissions but it seems to have done the job in my circumstances. No more lean jus upgrades from here!!!

[PyR0NiAk]

I fail to see how this affects anything as far as how the motor runs (lean or rich).. Your ECU gets a reading on the airflow from the MAF. Your MAF is post-air box. The only thing that could be making it work is maybe your MAF is failing to read higher flow rates. Have you tried a different MAF?