HI,
I have an 04 sti, and it has been modified. I had a walbro fuel pump and it went bad. car didnt start - banged on the gas tank and it would start then die. so i replaced it with CNT racing pump. if you check out the web site it is better the the walbro -( but i cant really be sure.) now the the car's AFR is lower then it was with the walbro. boosting around 17 psi, i was getting 14 something. now I am getting a crappy 11.1 . PLease help!!!! It was tuned for the walbro, could that be the problem. not that i have the CNT. or dose the new pump just suck!!

 

I think that's your problem....of its flowing more or less than what it was tuned for that may be throwing off your readings.... Hit up whoever tuned you and talk to them

 

so check this out---- i just put the old walbro back in and it was still running the 11.1 at boost.. this sucks .. i guess it is the tune or still not sure what to do at this point.. other then tune it ????? what do you think??

 

Try resetting the ecu

 

I have a walbro 255 for 80 comes with kit in case you need another one.

 

we will see i guess. i have the walbor back in and it was working but not sure y it is givine me different reading now. i reset the map with the access port. that didnt reall do anything.. any other ideas? the map i am useing was tuned by GST. so i guess i give them a call tomorrow. they always seem busy though... i just want to ask them over the phone if they have any ideas.. but time is money ... anyone else have any ideas.

 

I know youre trying to solicit ideas from I-club on what it could be, but you will get a range of different things.

GST is always busy which is cool but Mike will always return a PM or a message within a few hours to no more than a day.

I would PM GST with your problem, or if it suits you geographically I would just stop by. They will always take a look at the problem if you stop in.

 

Do you have any way of logging data ie tactrix or AP? Are you getting any CEL's?

 

Assuming you have the V2 Accessport you could data log and post it. Try Pming Mike, he will respond.

 

I will try PMing mike if i can find him on this.
I also want to ask all of you if it could be my filter? I did not change that. but the pump is running fine. one other thing i tried was changing maps. it was the same and ran lean, then i turn it back to the gst map and it was still running 11.1 under boost. just driving it is around its 13-15. will this be ok to drive for a bit to save up some money to fix it? thanks for everyones help...

 

I tired that i think. by remapping the and then driving under that still lean, then remapped it back and still lean.. do you think it could be the filter, pump, or tune ? Thanks

 

Okay, have you tried changing the FUEL FILTER? I'm not sure if the 04 STI is intank or right next to the brake booster.

 

I thought about that, but there has not been any problems like fluttering of fule or no issues starting up any more. ???? the parts dealer said the filter should be good for the life of the car ? Talked to Mike - gst , he said he thinks it is fine and can check my mapping - i just have to find time to get there... car has been running fine, so other then the a/f r. reading funny . its good.

 

Hey this is the problem we figured out a few weeks back that the stock o2 can only read that low right?