Bad gas mileage?
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Bad gas mileage? - 2/17/2008 11:13:12 AM
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sleeper_inc
Posts: 8715
Joined: 9/1/2006
From: Regina Beach, Sask
Status: online
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Lots of people seem to be PM'ing, or e-mailing me about bad gas mileage so I'll just tell you what you should do in this one post.
Bad gas mileage?
1. Pull Codes - http://therangerstation.com/tech_library/OBD_I.html
If no codes come up than continue, if codes do pop up, replace.adjust the parts as requested
2. When was the last tune up done?
If it was over 6 months ago, might be time to do it again (plugs, wires, rotor, cap, oil change, and fuel filter)
3. FPR
The FPR (Fuel Pressure Regulator) is over 20 years old on some of these cars, and more likely than not has blown its diaphram, meaning it has to be replaced (to test, pull the vacuum line off and if there is fuel in it, replace)
4. Bad/clogged injectors
The only true way to check the injectors is to have them tesed at a shop, which will cost you a few hundred dollars, so don't do this step unless your sure
5. Bad MAP/BAP
These will more than likely throw a code if they go bad, so replace if they throw a code
6. Bad MAF
These again will throw a code, replace or clean with a stock unit.
7. ECT (engine coolant temp sesnor)
These will throw a code sometimes, but most of the time they will not when cold.
8. o2 sesnor
Tell the computer your a/f ratio at hwy speeds, so replace if your fuel mileage is down on the hwy or if a code is thrown
9. Thermostat
This will keep your engine way/warm it up faster. 180* is stock, but I recomend 190* because you'll get more heat in winter.
10. Breaks dragging
This will cause your wheels to drag, causeing bad fuel mileage. To check lift your car off the ground, put car in nutral and turn the tires by hand. They should spin with some effort, but still sprin.
11. Under inflated tires
Under inflated tires don't spin as easy as properly inflated ones. Causeing less fuel mileage
12. Vacuum leaks
Car should pull 18+ inch pounds of vacuum at idle, if its pulling less you have a leak some where or your timing is off.
13. Timing
Your cars stock timing should be 10* with the spout unpluged
14. Proper Engine oil
10W-30 for summer, 5W-30 for summer
15. Speed
The faster you go, the more fuel you use
Add more if you can think of them please
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RE: Bad gas mileage? - 2/17/2008 2:10:36 PM
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MustangGuy93
Posts: 324
Joined: 7/17/2007
From: Carencro, Louisiana
Status: offline
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Also: replace, clean air filter
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