Hi:
You stated that you don't push the truck at that hard. The down side of
this is carbon build up. When it builds up in the combustion chamber it
raises NOx levels which will be noticeable on an emissions test (do you
have those where you live?). Carbon can also plug other passages in the
engine and coat the O2 sensor. I use on-ramps to regularly de-carbon my
engine, nothing like a WOT launch into traffic to keep the inurds clean ;-)
Did you notice if the check engine light even came on?
Dale
---------------
Rob S wrote:
>
> Bill Nissley wrote:
>
>> I had a sudden decrease in my gas mileage recently. I had been
>> consistently getting 14-14.7 mpg, now I am getting 13-13.5 mpg. A tank
>> was lasting me about 10 days, and now that is down to 8. The truck still
>> seems to perform the same, but I don't push it very hard so I don't know
>> if I'd notice a slight difference in performance.
>>
>> The only 2 things that I can relate it to was an oil change a Jiffy Lube
>> that I had done because I was going on a trip to Arizona (750 miles
>> round trip) and I didn't have time to take care of it. The second thing
>> was the trip itself. I left the day after the service. That is where I
>> first noticed the low MPG. It was lower on the trip than what I had been
>> getting around town. The outside temperature was in the low 100s, but no
>> overheating at all even with the air conditioner on the whole way. The
>> Viper fan seemed to work really well.
>>
>> Those 2 things may be coincidental, but since then I have had the
>> problem. Anyone have any thoughts?
>>
>> Bill
>> http://www.dakota-truck.net/profiles/dakota/Ah0EiM5qG@xcE/profile.htm
>>
>>
> I do believe that MTBE is banned in canada for the very reasons that
> were posted.
>
> It is typical to experience lower mileage when the weather gets colder -
> I think mileage and power are supposed to be best around 50F?
>
> All that said, whenever my mileage drops the first things that gets done
> are the plugs get switched. However, last time the dealer had it, they
> said that the throttle body had a lot of carbon. This was at 60K (100k
> km). They cleaned that up and I immediatley started getting another 60
> miles per tank (average a bit over 300 miles or 550km/tank in a QC with
> the 4.7).
>
> Rob S.
> Milton ON
> '00 QC 4.7 5 spd
>
This archive was generated by hypermail 2b29 : Fri Feb 06 2004 - 11:47:05 EST