backfire and check engine light

[1993gsxtalon]

ok i just drained the 5 yrd old gas to day and put about 4 gallons of 93 back in with some fuel injector cleaner when i rev just a little to much at once (not much) i get like fuel cut or something and it just bogs/stutters/or backfires then i get this check engine light for 4 secs then it goes away and drives normal until the next time i rev a little too much.

could it be a boost leak
or stuff still in the fuel sytem
or the cracks in my manifold

 

[LTUDSM]

try to replace fuel filter,and deff do a boost leak test ,those things should remove your problems

 

[1gDSM4g63]

Same situation I'm in. I haven't start my car in 10 months, but it was running fine with old fuel but I drained it out and put 93 octane fuel in and now suddenly my wideband is always lean no matter what I do with my SAFC. Clearly don't understand why it was running fine with fold fuel in and with new fuel in it runs lean.

 

[fourreGsixty3]

Did you drain the fuel lines when you changed the old fuel? If not theres one problem...if that fuel is 5 yrs old you might as well have pissed in the tank...may have had better results Replace the fuel filter, and run fuel through all the lines...there maybe consesation in the lines or somewhere in the system, and the filter may be plugged up. Also the CEL is mostlikely due to the backfire, due to setting the knock sensor off because it doesnt take much compression for the piezo sensor to emite voltage, and set the CEL off.

To the 3rd post...

WBs do have a habit of dieing...more so than narrow band o2 sensor's this may be your problem, and just be coinsidence that it is now, but it may have gone wacky months or weks ago without you knowing. If you have a friend with a wideband o2 sensor that you both know is working properly borrow that one, and see if your a/f guage moves off of lean. If was infact a bad idea to tune off the disco light show, and bad to have driven your car when tuning to try to get it off of lean, very easy way to do serious damage.

 

[1993gsxtalon]

thanks a lotfoureegsixty3 for the input i will change the filter tomorrow and inform you

 

[1gDSM4g63]

WBs do have a habit of dieing...more so than narrow band o2 sensor's this may be your problem, and just be coinsidence that it is now, but it may have gone wacky months or weks ago without you knowing. If you have a friend with a wideband o2 sensor that you both know is working properly borrow that one, and see if your a/f guage moves off of lean. If was infact a bad idea to tune off the disco light show, and bad to have driven your car when tuning to try to get it off of lean, very easy way to do serious damage.

If there is no problem fuel my Aeromotive FPR, Walbro 255 pump, and the 950cc injectors than it must be a bad o2 sensor. There is no way if there is nothing wrong with the fuel system that it cannot serve enough fuel with no boost. So the fact that widebands o2 sensor dies early might be true. When changing my SAFC setting it's pretty darn rich with white smoke coming from my exhaust and the wideband still saying it is lean. Perhaps I will switch to pyrometer unless sensor deathrate is just the same.

 

[meliketoball]

MAF sensor fell off?

 

[oldman]

ok i just drained the 5 yrd old gas to day and put about 4 gallons of 93 back in with some fuel injector cleaner when i rev just a little to much at once (not much) i get like fuel cut or something and it just bogs/stutters/or backfires then i get this check engine light for 4 secs then it goes away and drives normal until the next time i rev a little too much.

could it be a boost leak
or stuff still in the fuel sytem
or the cracks in my manifold

Holy run on sentence batman....please use proper grammar, punctuation and caps when posting in the tech sections of the forum.

LTUDSM, see what kind of bad example you're setting for newbies?

 

[oldman]

If there is no problem fuel my Aeromotive FPR, Walbro 255 pump, and the 950cc injectors than it must be a bad o2 sensor. There is no way if there is nothing wrong with the fuel system that it cannot serve enough fuel with no boost. So the fact that widebands o2 sensor dies early might be true. When changing my SAFC setting it's pretty darn rich with white smoke coming from my exhaust and the wideband still saying it is lean. Perhaps I will switch to pyrometer unless sensor deathrate is just the same.

1. Running rich = black smoke, white smoke = burning oil or coolant.

2. WB can read lean for many reasons, pre-sensor exhaust leaks for example.