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My 1997 F-150 just recently (past couple of weeks) started idling rough and getting worse than usual gas mileage. I changed the oil two weeks ago, did not notice anything unusual. I checked the oil today and I noticed a gasoline smell and a thick white film on the oil filler cap. I think gasoline is leaking into my oil.
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Need year/make/model/mileage of vehicle to provide a more specific set of troubleshooting steps.
When was the last tune up? Hard starts when cold are usually caused by fouled spark plugs, worn plug wires, or weak ignition coils. Fuel systems are not as effected by temperature changes as the ignition components.
These are the most common causes for bad mileage. Tire pressure is a huge factor (Tire should be set at the factory recommendation or 1-2 psi above, but never below - Tire should also be a Low Rolling Resistance Tire) Oil level (you said it's OK, so I assume it's not above the full mark) Running extra accessories (A/C, etc) Dirty Air Filter bad Ignition timing engine running hotter than normal fuel injectors may be stuck partially open bad fuel pressure regulator faulty emission control device (this usually triggers a check engine light)
well to me that is not very good mileage . have you had the vehicle long ? also did it get better mileage when it was newer ? how about plugs wires etc what has been changed and tuned up ? I would think it would get better than that alot of bigger pickups get that good or better.hows your driving habits ? Jerry
Ok not to keen on newer vehicles actually prefer the carburated ones, but oil pressure is supposed increase on your gauge when accelerating. If it wasn't going up before and just staying at 40 the needle might have been stuck. But idle should be 40 lbs and when you work the moter (reving or driving down the road) the guage should show an increase for every 1000 rpm above idle. Second if you can get a hand held scanner (bought mine off ebay for $30) check for any codes in your computer you will probably find that you either have a bank running wrong or some other sensor that needs to be changed. I'd go with getting my own scanner it saves alot of money and time, garages make their money here.
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