Code 31 and 22??
Ok I've got a really annoying problem that I just
can't figure out. I have a 1988 ford f150 and have
been getting codes 31 and 22. We took it through
emissions and it failed horribly. So we got an obd1
ran the codes and replaced the egr sensor and
map sensor we'll also got a new O2 sensor and a
new egr valve. We replaced the sparkplugs got a
new fuel pump and filter checked all the lines to
make sure there was no vacume leak and when we
were all done the truck ran smooth. We took it
through emissions and it passed with flying
colored the truck ran like a dream then about three
days ago the check engine light came back on and
it started running rough again and the same 2
codes are popping back up the we replaced the
whole system and its still reading the codes we
even checked the new parts to make sure they
weren't defected. Now here's the part that's
messing with us we went outside to turn it on this
morning and the light was off the truck was
running smooth we drove it all day with no
problems went to turn it off . a few minutes later
we turn it back on and the truck started running
rough again the check engine light back on and
the same 2 codes popped back up. I have no idea
what else to do. The last thing I can think of is
carbon build up but I'm not sure. Is there anyone
who might know what the problem is your
suggestions would be very helpful at this point.
Also sorry for the long message.