Its possible the 180 t stat is not allowing the PCM to go into open loop (or
closed loop ??) causing a rich condition. Truck is running to cold. What part
of the country are you in Chris??? If its been real cold out lately this
could be a problem. You may want to block a portion of the radiator (cold
months only!!) to allow the engine to run 5 to 10 degrees warmer, just don't
block the trans cooler.
After i installed the 180 t-stat, I actually got a Check engine because of
this problem.
Matt Y2K-HEMI
'00 RC 4.7L 5spd
In a message dated Tue, 9 Jan 2001 3:28:12 PM Eastern Standard Time,
bernd@texas.net writes:
<<
That method seems to work on the '97 but not later models.
Depending on how many miles are on the truck (like around 60K)...changing the
O2 sensor(s) is a good idea...but not required at anything below 50K. I had
replaced my MAP sensor (along with several other sensors...Crank Position
just
recently) and my mileage did go back up a bit...about 1mpg...nothing
substantial.
What did you modify on your intake? I hope you didn't cut the runner down
more
that 1.5"...that really messes up the mileage.
- Bernd
> Is there a "key on-off" method for pulling codes for my 99? I tried the
> sequence on the DML page but it didn't work, I think that's meant for
> GenII.
>
> After adding a 180TS, a Flowmaster, and modifying my intake my MPG
> dropped from an ave. of 15-16 down to an ave. of 9-10. Most I can get at
> 65 is 14mpg, used to be 20. That was 18 months ago, since then I've
> tried everything I can think of, and it's been to all three service
> centers in my area several times with no results. So I guess it can't
> hurt to replace the MAP and O2 sensors, I noticed another DMLer with
> mileage problems had good results with that. But before I did I wanted
> to check the codes, without taking it anywhere, see if there's any
> sensor errors.
>
> --
> Chris
> Black '99 Sport Plus CC 4x4 318 Auto. Everything but leather.
> 3" Rancho Suspension Lift, 32"x11.5" BFG MTs w/Gold Skull Valve Caps,
> SnugTop Expo w/Yakima Trac System w/Fairing, Sea Kayak and Bike Mounts,
> GoRhino Grill/Brush Guard w/2 130W KC Spotlights, Westin Side-Step Bars,
> WAAG Tail-light Guards, GTS Blackouts F & R, 180 TS, Cold K&N,
> Flowmaster, Line-X, Autolites, Window Tint, Ventvisors, No Decals.
>
>
>
>>
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