I get 10mpg and I have NO IDEA why; I checked everything; it's ALL STOCK.
2007-02-05 12:06:27 · 6 answers · asked by Anonymous in Cars & Transportation ➔ Maintenance & Repairs
Both upstream o2 sensors are changed; plugs got 20k on 'em; oil and air filters are all new.
2007-02-05 12:12:14 · update #1
5W20 engine oil is the specified grade of oil for ALL Ford gasoline engines, 2001 to current, EXCEPT 4.0L SOHC V6. Changing your O2 sensors will achieve absolutely nothing, other than leave you $120.00 poorer unless there was something wrong with them to begin with. What kind of plugs are you using? If you are using anything that's other than the OEM Motorcraft plugs, that could cause it. How are your fuel trims? Do you have any vacuum leaks. Did you check the PCV at the back of the throttle body? Is it collapsed? How about all the plastic and rubber hoses? How about the air inlet? Is it stock. Modifying it can cause poor mileage. How about the coil-on-plugs (and I'm NOT advising you to replace it without verifying it's working first)? Does the engine misfire? A dirty MAF sensor, or ANYTHING that affects the fuel trims WILL affect fuel consumption. So will driving habits.
2007-02-05 12:52:09 · answer #1 · answered by Michael 3 · 0⤊ 0⤋
I've noticed that Ford is dumping 5w-20 in their new cars lately, here's my take. If your truck originally called for 5w30 I'd stick to it. Maybe your cylinders and rings are showing a touch of wear. When you need the extra ring seal the high end (30) of the 5w-30 is doing the trick for you. If you live in an extremely cold weather climate a 0w-30 would be better. I've gotta believe Ford's new stuff 06 - 07's have tighter clearances throughout. That would make sense. Trucks (your year) 05's and back should be using what your hand book call for. If you have no leaks around any of your pan or valve cover gaskets try a full synthetic 5w-30, less friction less heat, better detergent package, better wear qualities etc.
2007-02-05 12:52:02 · answer #2 · answered by Country Boy 7 · 0⤊ 0⤋
Use the oil that is recommended by Ford for your vehicle. If it’s a 2000 and up then it will probably say 5w-20. For the low gas mileage you may need to change the fuel filter and get the fuel system cleaned.
2007-02-05 12:32:24 · answer #3 · answered by chris t 2 · 0⤊ 0⤋
without guessing what is wrong you need some data. To get that you need to have your exhaust analyzed. could be as simple as a dirty air filter or as complex a messed up mass air flow sensor.
2007-02-05 12:14:32 · answer #4 · answered by gary o 7 · 0⤊ 0⤋
No, that oil is thin and wouldn't cause bad gas mileage. Change your oxygen sensor..... that will increase your gas mileage. Also make sure your engine is tuned up good, new air filter plugs and oil change.
2007-02-05 12:10:40 · answer #5 · answered by Anonymous · 1⤊ 1⤋
oil is too thin to cause the problem infact to thin to protect move to 1040 also carbon build up on air horn can cause bad map and maf readings clean it
2007-02-05 12:28:34 · answer #6 · answered by Anonymous · 0⤊ 0⤋