1992 CC 5.2 auto 4x4 156k on the ticker.


problem im having is a bit odd and hard to even think of what could be causing it.


when it snows i get extremely bad gas mileage and the exhaust stinks horrible. It doesnt happen in the rain. it wants to stall out when coming to a stop but never does, it always catches itself with a quick rev to about 1200 RPM. Sitting stopped it seems to be loading up as it progressively runs worse and stinks more at a stand still. I had this problem as well last winter but i figured it worked itself out somehow. I was wrong, now on the first snowfall its back. the truck doesn't have a converter on it anylonger as last year i thought that was causing the problem i had it cut off and a pipe welded in its place. ran perfect all summer towing my boat and being a daily driver. hottest days to coldest days no issue.

i'm curious as to wlhat controls the air fuel ratio on this thing and if there is some kind of a sensor underneith that might be getting caked with salt and ice. i looked under the hood and it doesnt seem that anything is getting wet. also had a full tuneup last year that didnt resolve the problem.

any help is appreciated

 

All the sensors control the Air Fuel ratio. The most important is the MAP and O2 sensors. The O2 sensor is underneath the truck on the exhaust pipe. It is possible it is bad. Do you have a Check Engine Light? Did you check the codes?

 

no CEl's i'll check for codes today and reply back

 

code 45 Transmission OD solenoid circuit short or open condition detected

and code 51 Fuel system lean


and directions?

 

The fuel ratio is lean. The 02 can cause this too.