vafc crap new problems
03-11-2007, 03:28 PM
#11
3.0 BAR
Join Date: Aug 2003
Location: NE-PA
Posts: 4,666
Re: vafc crap
Originally Posted by ososlohatch
i havent been drivin it due to the fact i cant even get it to run right in my garage..lol. im not sure why it would go to 10:1 then a second later jump to 16:1 
then die ? wtf im not throwing anycodes but i dont have a stock o2 sensor hoooked up, thats the only thing i could think of
then die ? wtf im not throwing anycodes but i dont have a stock o2 sensor hoooked up, thats the only thing i could think of 
03-12-2007, 12:44 AM
#13
0.0 BAR
Join Date: Feb 2003
Posts: 0
Re: vafc crap
Originally Posted by slo_crx1
If anything that would make it run a hair bit richer. I used to do that as an old trick to squeeze a little extra fuel...would disconnect the o2 and let it pop a code for it on my old pg7's and d16's
Pre-OBD and OBD0 immediately ignore O2 upon a quick enough change in MAP or RPMs. OBD1/2 will continue to respond to the O2 until TPS goes over 4.0 volts. Further, OBD1 is really good for rich stumbling part throttle if you don't have an O2 sensor hooked up... the ECU sees 0 volts coming from the ECU, ASSumes lean, and starts dumping fuel.
03-12-2007, 03:05 AM
#14
3.0 BAR
Join Date: Dec 2002
Posts: 3,830
Re: vafc crap
Unplug o2, engine warmed, 6-7sec of sustained decel injector cutoff, and an OBD0 will CEL the o2 like clockwork. Dont know if obd1 error checks the same.
vafc's look cool at night, while FMU's rape your pump and get the job done.
vafc's look cool at night, while FMU's rape your pump and get the job done.
03-13-2007, 09:16 PM
#16
3.0 BAR
Join Date: Aug 2003
Location: NE-PA
Posts: 4,666
Re: vafc crap
Originally Posted by Joseph Davis
Careful.
Pre-OBD and OBD0 immediately ignore O2 upon a quick enough change in MAP or RPMs. OBD1/2 will continue to respond to the O2 until TPS goes over 4.0 volts. Further, OBD1 is really good for rich stumbling part throttle if you don't have an O2 sensor hooked up... the ECU sees 0 volts coming from the ECU, ASSumes lean, and starts dumping fuel.
Pre-OBD and OBD0 immediately ignore O2 upon a quick enough change in MAP or RPMs. OBD1/2 will continue to respond to the O2 until TPS goes over 4.0 volts. Further, OBD1 is really good for rich stumbling part throttle if you don't have an O2 sensor hooked up... the ECU sees 0 volts coming from the ECU, ASSumes lean, and starts dumping fuel.
What's your fpr set at anyway? Could be a bit high. Never seen someone have such a weird issue with an afc before
03-14-2007, 12:43 AM
#17
3.0 BAR
Thread Starter
Join Date: Apr 2005
Posts: 6,036
Re: vafc crap
Originally Posted by slo_crx1
Hmm...maybe that's why my old trick used to seem a little doggy at first and then take off like a raped date. I always thought the cel would make it read off the timing and fuel maps 100% of the time that way...good info to know. I rarely dabble in the obd1 world just yet, or at least in the way it functions, so the obd1 info is def. good to know.
What's your fpr set at anyway? Could be a bit high. Never seen someone have such a weird issue with an afc before
What's your fpr set at anyway? Could be a bit high. Never seen someone have such a weird issue with an afc before
03-14-2007, 03:12 AM
#18
1.0 BAR
Join Date: Feb 2006
Posts: 358
Re: vafc crap
ok i was having the same problem but had to take my ---- off to drive it daily. but my fuel would not be corrected by the ecu. im guessing i had it wired wrong. could you let me know thrue pm with map wire to hook it up to. i mean the pin# and maybe how the grounds go on and where. thanks. i looked everywhere and got 3 different answers and none of them have worked. lmk. thanks
