MICHAELCORY

My 97 MAX GLE is not getting good gas mileage. I had my fuel injector cleaned and I noticed the increase in power for about a day or so then it went away. Anyone have any ideas what the problem could be. Thanks in advance.

Daniel B. Martin

Your car is using too much fuel. Four possibilities exist:
- you are burning it
- you are leaking it
- someone is stealing it
- you switched to gasohol


Burning it...
- fuel injectors are sticking open
- "tired" Oxygen Sensor
- bad fuel pressure regulator
- obstructed fuel return line
- bad Engine Coolant Temperature Sensor
- stuck-open thermostat (engine never goes into closed-loop mode)
- transmission defect (never shifts into fourth gear)


Leaking it...
Search for fuel leaks by sight and odor. However, some fuel leaks are so
tiny that they escape the human senses. One way to find them is to have
your mechanic use his exhaust gas analyzer. Switch the tester to HC
(hydrocarbons) and then pass the probe along the entire fuel system,
starting at the fuel tank, forward along the fuel lines, past the filter,
all around the engine, then along the return line and back to the tank.
The tester is far more sensitive than the human eye or nose. When the
probe passes near a tiny leak the reading will abruptly increase.


Stealing it...
Perhaps someone is stealing small quantities of fuel, not for its financial
value but as a prank. Install a locking fuel filler cap.


Gasohol...
- You may have switched from one filling station to another,
and not realized that you were also switching from gasoline to gasohol.
- You may live in one of those regions which is required to sell oxygenated
fuel during the cold weather season.

Now that MTBE is in disfavor, gasohol is the most common oxygenated fuel.
Alcohol has a lower energy density than gasoline.

cooler2000

I have 100% same problem, same year car and model, even same color!

I average 10-11 miles per gallon in city driving but on hwy it is like 350-400 miles on tank.

If you ever solve this problem please post it on this forum or email me at cooler2000@zxmail.com

Thanks!

_DRU_

wow, never heard that one before. i used to get about 250 miles per tank with driving about 75 of those miles at WOT. i just recently cleaned my injectors, changed engine and tranny oil and fuel filter and recived an additional 50 miles per tank. so now i hit about 300 miles per tank driving 75 of those miles at WOT.