I have a 1999 Silverado that I have not been driving that much
(since October 2013). One of the last times that I drove it
it started to run a bit rough, it back fired and farted a bit,
then I parked it and only drove it a few times for maybe six
miles each time. No back firing, but it was still running
a bit rough.
It is about time to change the fuel filter on it, again, and
put in some good fuel before I do anything else.
Anyway, a couple of years ago I replaced both post cat O2
sensors because of the thing coding out. Approx two months
later the RB post cat sensor started coding again, but the
truck ran fine and I foolishly just ignored the service engine
light. Of course I could not find the receipt to exchange the
part (found the LB receipt LOL!), and at 110 dollars I was not
going to dump the money on it due to other circumstances that have
changed into other circumstances.
To put it plainly, I cannot afford to dump $110 on the truck
at the moment. I am wondering if the truck was sensing a rich
mixture and leaned out the RB too much. If this is the case,
is there a way to parallel the LB sensor temporarily? I suspect
I can mess with the connectors to make sure that they are making
good contact. Both replacement sensors were Bosch and had factory
pigtails. I cut off the old sensor pigtails and might be able to
fab something together without hacking into the truck wiring.
I just hope that the cat wasn't fried. The truck did smell like it
was running hot in some fashion. I might have cooked the thing
I figure that if I run the sensor in parallel it will at least give
the right bank a close approximation of the proper mixture to dial
into the RB.
(not proof read or spell checked - sorry)