how to adjust a/f ratio
12-21-2006, 07:48 PM
#11
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Join Date: Dec 2005
Location: Lil' Rhody
Posts: 22,376
RE: how to adjust a/f ratio
ORIGINAL: 94gtcoupe
if he isn't burning all the fuel in it wouldn't make the timing slightly higher(1 or 2) hwlp to burn all the fuel??? and yea lowering the fuel pressure would help but it's kinda hard to do with out a adjustable fuel regulator isn't it?
if he isn't burning all the fuel in it wouldn't make the timing slightly higher(1 or 2) hwlp to burn all the fuel??? and yea lowering the fuel pressure would help but it's kinda hard to do with out a adjustable fuel regulator isn't it?
12-22-2006, 12:39 AM
#13
6th Gear Member
Thread Starter
Join Date: May 2006
Location: earleville md
Posts: 10,357
RE: how to adjust a/f ratio
yea i just wanna lean it out a little to pass emissions, then put it back to normal. runs fine, timing is stock, all that good shyt. but its failing by such a little bit if i lean it out a little i think i can get it to pass. yea shes failed 4 times now, i have a new egr comming in the mail(thanks to r.barn, thanks again man). originally it failed nox and the unburnt fuel thing(cant remember name of it), and now i got the nox to pass(tried that "guarenteed to pass" shyt, n it helped, but didnt pass, guess i get my money back now, lol). ii wouldnt even say its running rich, theres no signs of it at all, just wanna try to lower it down a little for emissions testing, then back to normal.
12-22-2006, 01:34 AM
#17
4th Gear Member
Join Date: Sep 2006
Location: Virginia
Posts: 1,292
RE: how to adjust a/f ratio
I don't know for a fact that it would work, but try unblolting the exhaust just a little, mabye a 1/4 inch gap. If you do it to much then the machine might read a leak (Don't know what machine they are using). It lets some air in with the exhaust and generaly helps lower all the numbers.
12-22-2006, 02:24 AM
#18
2nd Gear Member
Join Date: Dec 2005
Location:
Posts: 296
RE: how to adjust a/f ratio
high nox = high combustion temps above 2500 dg f check timing(to far advanced will cause high nox),egr, lean A/F mixture will cause high nox, and check catalytic converter.
high hc = lean miss fire. check ignition system, plugs, plug wires, timing(put at stock or 2 degrees lower than stock), internal compresion, vacuum leaks,air injection system.
high co = running rich/incomplete combustion. check carb, injectors, dirty filter, air injection system(air pump)
if push comes to shove just replace you cats and you shoud be fine!!!!!! i hope this helps you it would suck for you to sell you car over bar(bureau of automotive repair). I got this from bar smog check inspection manual. one more class and i get my smog license.
high hc = lean miss fire. check ignition system, plugs, plug wires, timing(put at stock or 2 degrees lower than stock), internal compresion, vacuum leaks,air injection system.
high co = running rich/incomplete combustion. check carb, injectors, dirty filter, air injection system(air pump)
if push comes to shove just replace you cats and you shoud be fine!!!!!! i hope this helps you it would suck for you to sell you car over bar(bureau of automotive repair). I got this from bar smog check inspection manual. one more class and i get my smog license.
