91 , ok
8valve or 16 ? very important , vastly different EFI.
4wd ?
manual tranny?
I'll assume you did the basics (tune up, done, ok).
compression, check valve timing, must be correct.
code 12 , great.
8v does not have a MAF ( but you didn't say what engine)
Just tell us how many fuel injectors do you see?
I have a bogging page.
powerloss
does car idle proper at 800rpm hot?
and 1200 rmp cold?
does car have lots of power COLD and bogs only HOT.?
when you answer these questions, we can find out
what your engine and EFI are doing.
welcome to Suzuik forum.
you got a good deal, here where I live once you fix this problem the car is worth 1200 to 2500.
good news, if the basics are good, we can fix this cheap. (engine and tranny not blown)
worry the CAT last , as it is almost ALWAYS a victum. Not a CAUSE.
yes it can be tested , with a pressure gauge. its easy if you have gage.
since I have no idea what country you are in or smog regs, I can
not help much.
Many times,when the cat clogs, you fix the EFI condition and then run the car and the cat will clear out in time. But if you are due a Smog check in the next 30 days, then my help is of no use, SEE?
If you say where you live ( General) we can give vastly better advice.
