Fj60 2FE Engine Codes

Joined
Jan 5, 2015
Messages
243
Location
Dallas TX
 
I have a 1984 Fj60 with a 1988 Fj62 fuel injection engine head on it. The donor engine was already desmogged so i put on a desmogged EFI on. I left my catalytic converter on when i first drove it (Because i was lazy) but as soon as i cut it off i got the engine codes 25/26. the exhaust pipe i put in to delete the catalytic converter has a ton of pin holes and it has a bad exhaust leak, could that be the cause of the engine codes firing off? with the research ive done its most likely not the O2 sensors but I dont know where to start really. the O2 sensors are before the exhaust leak so im doubtful it could cause the codes.
 

cruisermatt

Un-manufacturable
SILVER Star
Joined
Jul 22, 2012
Messages
8,196
Location
Orlando Florida
 
What are 25/26 again? AFR?

I've ran around with open downpipes before and not gotten any codes so I don't think that's me exhaust leak is necessarily your issue... Pull the O2 sensors and see if they test to spec.

How is your exhaust set up? OEM downpipes?
 
Joined
Aug 26, 2009
Messages
11,633
Location
down in a hole.
 
 
25 and 26 are rich or lean not sure which is which, but they would both flash on mine before I swapped in some new denso O2 sensors...
 
Joined
Jan 5, 2015
Messages
243
Location
Dallas TX
 
So i did some more research and concluded to fix the exhaust leak, I had a ton of holes in it and i think having no back pressure is what caused the codes. after i fixed it i reset the computer and drove for about 60miles and haven't gotten the check engine light again,
 
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