car leans all the way and sputters

nonvteclude · Post by **nonvteclude** » Mon Aug 03, 2009 9:40 pm

hi, I am new to this forum but have read close to every post to try and resolve my issue. nothing seems to match what im going through. one day i was driving to work and had to floor the car to merge, when the car back fired really bad and whenever i would hit the gas it would sputter really bad and wideband would show full lean. i pulled over to check for any major issue (wasnt getting any cels and all gaugees looked good) so turned it off back on but was still there. so drove to get to safer spot and it cleared up. well now when i cold start the car it will drive fine for most of the day then starts doing it again. i can not seem to figure this out. ive changed plugs, wires, rotor cap, replaced aem fpr w/ stock, fuel pressure is steady at 42 psi. please take a look at this datalog, problem was happened at 4:50-5:00 and 5:35-5:45.

setup
95 prelude h23, 9-1 pistons, stock head, bkr7e plugs, stock ignition, turbo, hondata 4bar, s300 w/boost control, walboro 255 and rc 750. can give any info needed.

thank you

kinetics · Post by **kinetics** » Tue Aug 04, 2009 6:59 am

Clogged/faulty injector?

Post by **Spunkster** » Tue Aug 04, 2009 10:12 am

It looks like you are trying to run closed loop off of a wideband input and that will not work.

Closed loop can only be run from a narrowband input.

nonvteclude · Post by **nonvteclude** » Tue Aug 04, 2009 11:37 am

the wideband is not connected to the ecu. its still running on the narrow band.

Post by **Spunkster** » Tue Aug 04, 2009 12:54 pm

Looking at your datalog you can see thay your short term trim is alwys way off which means that the car is not properly tuned to run in closed loop. After only a few minutes your long trim is up to -4%. A properly tuned car in closed loop will be at 0 + or - 1% after many driving cycles.

nonvteclude · Post by **nonvteclude** » Tue Aug 04, 2009 8:50 pm

ya i noticed that too. i looked at some old data logs to compair and it wasnt that bad before. so did some testing after looking at the af and lamba voltage and i found a wire that was cut and had two strands holding it together which turned out to be the green/white wire for the o2. so resoldered the wire and replaced the o2 sensor (under warranty) and so far is driving fine. if it didnt fix it i have a tune set up and will see what happens. thanks for the replies.