Contour Enthusiasts Group Archives Forums General Troubleshooting 99 SVT only getting 19 Mpg consistantly

But it isn't "always" starting from the same point. Different pumps, different stations, even different temperatures and humidity can cause the actual amount fueled when "topping off" to be more, or less than the time before it. not a drastic amount, but still there.

If the previous suggestions for maintenance don't help. I SERIOUSLY suggest a UIM/LIM teardown and cleaning. you can't mess it up with the HOW-To posted in the Duratec Maintenance FAQ. With more than 33K miles on your engine, you're likely getting pretty dirty. Restore stock horses, and increase your current mileage with this procedure.




Ray

Okay, folks, my '95 Mystique with the 2.5, CD4E gets 25 MPG give or take 1/4 gallon. I almost always fill up at the same station. I fill it the same way every time. My driving from Mon. to Fri. is the same "to work and back", 30 miles round trip per day. Weekends I put on any where from 75 to 275 miles (I fill up on Fridays before work, mostly). Most of my driving is on a freeway @ 68 MPH. On 2 occasions I got 27 MPG. I usually fill up at around 1/4 tank. Tyre pressure is 44PSI per tyre manufaturer (Kelly Charger 205-50-15). I replaced the air filter shortly after I got this car in July. Actually runs crappier since then; Fram filter. The one I replaced was whatever CARX uses. Another bad thing I did after I replaced the filter was to put in a bottle of Gumout fuel injector cleaner. Since then I let the car idle for about 2 to 5 minutes in the morning, otherwise it acts like it is starving for fuel. Is 25 MPG normal for this type car, engine, trans?? And to say also, I got this type of mileage before the filter and Gumout situation. Car has 94700 miles.

Later. Pepse.

I only get 18mpg on average on mine. Then again I comute in bumper-bumper traffic almost every day. 19 sounds fine if your comute involves heavy traffic.

some things to think about:

is odometer accurate? changing tire size may change odometer accuracy.

wider, stickier hi performance tires will yield lesser gas milage than narrow, harder compound tires.

if your imrc is not working correctly, that can affect milage.

after that, there are a lot of things engine related that could affect things. clogged cats, bent exhaust pipes, spark plugs & wires, air filter, egr system, etc.

could be something mechanical:

maybe your brakes are binding up or you have bad wheel bearings.

everything is stock. except for a high flow drop in air filter that was added in june. tires are on the stock rims and are 215/50R16 BFG Traction TA's

and crap... i have no idea what all these abbreviations mean... someone needs a guide for newer people on here. I know UIM and LIM but the others in the last reply... i have no idea... like what is imrc?

My 98 2.5 5 speed gets a consistant 26.5 to 27 mpg in a mix of 80% stop & go & 20% highway driving. Strictly highway it might pull 29-30. If these cars had a real overdrive that would drop the rpm's to 2200 or so at 65 (instead of 2900 or so) I'm sure 35 mpg would be no problem. The engine has more that enough power to pull a taller overdrive.

To be accurate, that isn't my finger.

that picture was pulled fromt he original IAC removal faq.

Also, as for terms, and abbreviations:

we DO have a guide.

Linky

For the 0420, search on that term (P0420, or 0420) in troubleshooting for more than enough info.

Synopsis. Could be anything that causes your air:fuel mix to be off (enough to make the car think that the cat if failing) or the cat could be failing.

plugs/wires, fuel filter, fule pressure, air leaks, exhaust leaks, etc.


Start with a good cleaning of the air filter, fuel filter, and change your plugs(possibly your wires too) (most V6 users opt for autolite app764 double plats for consistant performance on the waste spark ignition system in the contour.)

Ray