i have REALLY bad gas mileage!!
#1
i have REALLY bad gas mileage!!
i have a 98 max with a JWT POP intake and Budget Y-pipe on for about 4-5 years now. i have around 120k miles and my mileage suddenly got real bad..like hummer mpg. MY exhaust smells like gas when i start my car also.
What could be the reason for this? time to change intake? faulty 02?
any input appreciated
What could be the reason for this? time to change intake? faulty 02?
any input appreciated
#7
There are so many variables here, it's foolish to start throwing things out like "Must be knock sensor!!!"
If you're smelling gas, is it leaking?
How many miles are on the car?
Have you pulled any codes from the ECU?
What color is the exhaust, if any?
What color are the spark plugs (check all 6)?
How many miles since the spark pulgs were replaced?
How many miles since your last fuel filter change?
How many miles since your last air filter change?
Have you ever replaced the knock sensor?
Is your tire pressure correct?
Is your alingment correct?
Have your driving habits or traffic patterns changed?
Is the type of fuel you've been using changed (both by Octane rating or by gas station, since some use different winter blends)?
Have you done any recent mods to the car?
Most importantly, SEARCH before you POST. There must be 10 threads a week on fuel economy.
If you're smelling gas, is it leaking?
How many miles are on the car?
Have you pulled any codes from the ECU?
What color is the exhaust, if any?
What color are the spark plugs (check all 6)?
How many miles since the spark pulgs were replaced?
How many miles since your last fuel filter change?
How many miles since your last air filter change?
Have you ever replaced the knock sensor?
Is your tire pressure correct?
Is your alingment correct?
Have your driving habits or traffic patterns changed?
Is the type of fuel you've been using changed (both by Octane rating or by gas station, since some use different winter blends)?
Have you done any recent mods to the car?
Most importantly, SEARCH before you POST. There must be 10 threads a week on fuel economy.
#12
well how about before we go guessing everything that could be wrong you check what your actual MPG is, see if your check engine light is on etc etc. Have to put a little work in before anyone can even guess what is wrong. Otherwise you will end up hearing just about every sensor imaginable as almost anything failing on your car will probably effect your mpg in some way. Take a look at the nice checklist above and then get back to us.
#27
Dipsticks are fabulous.
But seriously try http://forums.maxima.org/showthread.php?t=72447&page=2
Post number 38 talks about causes of low gas mileage, try there first.
But seriously try http://forums.maxima.org/showthread.php?t=72447&page=2
Post number 38 talks about causes of low gas mileage, try there first.
#35
If your engine is running rich, This might be a sign of 02 replacement or even MAP sensor replacement....I think it helps to regulate fuel management....I would aslo try cleaning your TB and EGR and just get all the carbon build up and other gunk out.
#37
Well i just filled up today. I did 225mi on 16.23 galons , which comes out to 14 some MPG. This is unacceptable...i am going to get some work done on it...including
-alignment
-balance
-oil change
-o2 sensor testing
-alignment
-balance
-oil change
-o2 sensor testing
#40
Here's the O2 How-to:
http://forums.maxima.org/showpost.ph...2&postcount=24
How much would be a reasonable price to have a shop test and/or replace the O2 sensor?
Or maybe the better question is: How many hours should a shop bill for those services?
http://forums.maxima.org/showpost.ph...2&postcount=24
How much would be a reasonable price to have a shop test and/or replace the O2 sensor?
Or maybe the better question is: How many hours should a shop bill for those services?