03-X type 2.5, 137000
How much does #1 O2 sensor, either bank change the MPG if they are slow?
I have got the girl operational with out any MILs , went through the drive cycles and all is ok,But I have a visibly slow bank 2 sensor 1, Visibly meaning , I can watch it on the scanner while driving, bank 1 sensor 1 is pretty much at 0, bank 2 sensor 1 is mostly at -5 t0 -10, this is all at normal operating temps and freeway speed w/ cruse on. Also on start up (hot or cold) the MIL & check lite stay on a tad longer than they previously did, (a Tad is 10-15 secs.)and sometimes a slight miss on cold start. Shortly after I finished doing the repairs I would get a P0305(random miss fire)on start up cold but that has gone away so far. MPGs have took a hit also, down 4-5 mpg.I was thinking of buying a #1 02 sensor but I don't like throwing parts at anything.
PARTS IN: plugs,upper"o"rings,pvc tube,brake boost line,tuning tube "o"rings,cleaned mass air & injectors, general check of ALL LINES,hoses ports and connections.SO if any of you can suggest something I missed I thank you in advance.

 

I see I am now listed as a senior member,boy ya got that right MY odometer just clicked 64, took me four hours to replace a radiator in a 98 grand cherokee yesterday.sucks to get old, enjoy your youth gentlemen!

 

I can certainly understand that. When I spend a Saturday now working on my 1948 Chevy sedan, I can hardly move for a couple of days. I'm coming up on 66.

Regards:
Oldengineer