Originally Posted by jameswbarton57
I just bought this truck with 70K miles.
The engine runs smooth but due to getting only 10.5 mpg I decided to change spark plugs. I removed champion platinums and NAPA told me an Autolite titanium was a good replacement. The titaniums have a split circular electrode.
Now I get worse mpg. Does this sound logical? If so what type of spark plug and plug wires are good for the 2001 V10 I see a good deal on Bosh Platinum wires but am wary of making something worse. The current wires are mopar they do not look bad but they no longer fit tight on the plugs.
The analyzer shows no misfires.
Also the temperature gage shows only about 170. It seems to get better mileage when it is 90 degrees outside than when it is 70 degrees?
Any advice on plugs, wires, and thermostat temperature
Yes, it does sound logical. If you put the wrong plug in, then the engine will not run correctly. Look at your EPA sticker, it will tell you what to replace them with.
The PO may have put a 170 t-stat in it, which IMHO, is too low. The engines were designed to run at 210, and thus will not operate correctly. The computer may think that the engine is still warming up and keep it in a cold loop, meaning it's dumping way more fuel than what is needed causing the bad mileage.