injectors problem?

[Petersho1]

Short story;
Two months ago on daynotest with WB O2 engine runs lean AFR 15,5. No vac leak.
One month ago didn't pass emission test too hight HC unburnt fuel.

until yesterday KOEO,KOER 111 balance test 9,
yesterday balance test 3 then 9 3rd cyl 'weak'
today SHO runs bad, did BT code 2 then 2 and thrid 2- 2cyl dead
1st Q= fuel injectors right?
2nd Q= How about cats, I don't know how long I was driving with lean misfire, melted? need new ones?

60K done last winter (full) new O2, don't see any vac leak,wires and plugs new.
142.000 miles

Thanks for any help
Peter

P.S Should I clean them or buy new ones (injectors)

 

[projectSHO89]

I would make certain that the problem was not ignition before diving into the injector and its circuitry.

Swap the # 2 and #6 plug wires at the coil. Rerun the CBT and see if the problem moves to the #6.

Swap the plug between the # 2 and another cylinder, rerun the CBT.

If the CBT still points to the # 2 cylinder, then focus on the injector and its wiring.

Steve

 

[Petersho1]

I did, still #2
How about cats? If I'll take them out will I see something?

 

[AutoSHO]

Cats won't affect only 1 cyl.

 

[CheckerSHO]

a "lean" condition as indicated by the wbo2 sensor means there is too much oxygen in the exhaust. A misfire will cause that. You may not have a lean misfire, it dosn't really matter whats causing the misfire you will still get more oxygen out the exhaust when the misfire occurs even if its an ignition related misfire. I just had a similar problem on my SHO...cylinder 3 misfire from a bad plug wire causing my a/f meter to basically say there is a lean condition, but in reality the extra oxygen came from that cylinder misfiring.

 

[CheckerSHO]

Cats won't affect only 1 cyl.

I think he is concerned about the health of the cats after running with a misfire for an unknown amount of time. I think if your area has emissions testing....they could tell you by just getting an emissions test. If you have the factory Y-pipe, they are pretty bad about coming apart i believe. Every SHO i've owned so far has had the dreaded "white dust" in the cats. With the Y-pipe off the car i looked down in the bank 1 side and could see white flakes... which im pretty sure was the catalyst coming apart. Check out www.shotimes.com for more info...look under "what can **** a sho motor"

 

[Petersho1]

Thanks "CheckerSHO" for info. You made a good point.

 

[CheckerSHO]

Thanks "CheckerSHO" for info. You made a good point.

not a problem
I just noticed you have the SS Y-pipe...I doubt you would see the dust on those cats like the factory ones. If its coming apart you could hit it with a soft rubber hammer (gently!) and you should hear a rattling. Otherwise i wouldn't worry about it