Engine Performance problem
1999 Dodge Caravan 6 cyl All Wheel Drive Automatic 170000 miles
3.8L V-6 Grand Caravan ES AWD owned since new and always maintained and oil changed religiously. Runs like a top, clean exhaust, etc. And yet the fuel mileage has gradually declined by about 3+ mpg since new (was good for an easy 16/24, now about 13/19). I burn no oil between oil changes and power is good, so don't think engine wear is a factor. Transmission rebuilt 17K miles ago and still shifting nicely with no slippage. Filters are clean. Plugs replaced about 35K miles ago. Injector body decarbonized per recommendation of dealer to no affect.
Dealer says this is normal for higher mileage vehicles. Maybe for my 1965 Chevy with worn out cylinders, but I'm skeptical in this case. What are the other lilkely culprits if the cylinders are assumed to have little wear and considering it runs perfectly? The exhaust is still all original and I sometimes wonder how the cat is doing, but so far not affecting the way the car runs.
Friday, July 23rd, 2010 AT 1:41 AM