Poor MPG... sometimes
10-02-2006, 07:55 PM
#1
Poor MPG... sometimes I've noticed lately in my A4 that I'm ABLE to get 300 miles to a tank or around there if I do ONLY highway driving, but otherwise I BARELY get 200. It's really closer to 180, really.
My friend told me I might need to replace my thermostat, but I noticed this happening mostly after I seafoamed a few weeks back. I'm thinking I might have clogged up my cat or fouled an injector and/or plug, but I'm not showing any codes?
Maybe I'm just noticing it more now, but that's kind of low for miles to a tank isn't it?
My friend told me I might need to replace my thermostat, but I noticed this happening mostly after I seafoamed a few weeks back. I'm thinking I might have clogged up my cat or fouled an injector and/or plug, but I'm not showing any codes?
Maybe I'm just noticing it more now, but that's kind of low for miles to a tank isn't it?
10-02-2006, 11:00 PM
#4
I haven't done a single thing to my car and it doesn't look like any of the previous owners have either. The only stange smell I can think of is sometimes, very rarely, and very faintly, i can smell a bit of burning rubber but I've only noticed this like twice and it as almost impossible to smell. You couldn't even notice it until you stepped out of the car.
10-02-2006, 11:47 PM
#6
well you dont see to be running that rich if there arent any smells, i have a A4 also and they tend to chug a bit more then the M6s....theres several things you can do to get the mileage up a bit....new air filter, fuel filter, check your plugs, and O2s...this might give it a little bit of improvement but like i said your not really showing any symptoms.....no smell, no bog, nothing like that....and please dont let your butt start telling you things.....just give it the once over in the departments i stated and check back with us
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10-06-2006, 07:58 PM
#14
I cleaned my K&N filter recently and checked all my fluids - everything checks out but it's still happening. Maybe it's always been this way and I just didnt NOTICE but today, after my needle got to the quarter tank mark, it was empty by the time I drove 25 miles. That's not even an exaggeration.
I'm thinking it really might be a thermostat problem but I'm going to sound stupid saying this: Maybe my engine is running TOO cool? My temperature never gets to the first notch (thats like 180 isnt it?) it's always like 3/4 of the way to a quarter of full temp. Maybe my thermostat is stuck in the open position and its causing extra strain somewhere on my engine or... something?
I really can't think of why I'm getting such crappy mileage. If I did my math right, I should be getting at least 270 miles to a tank if the Trans Am gets ~18 mpg in city and has a ~15 gallon tank right?
I'm thinking it really might be a thermostat problem but I'm going to sound stupid saying this: Maybe my engine is running TOO cool? My temperature never gets to the first notch (thats like 180 isnt it?) it's always like 3/4 of the way to a quarter of full temp. Maybe my thermostat is stuck in the open position and its causing extra strain somewhere on my engine or... something?
I really can't think of why I'm getting such crappy mileage. If I did my math right, I should be getting at least 270 miles to a tank if the Trans Am gets ~18 mpg in city and has a ~15 gallon tank right?
10-08-2006, 12:27 PM
#19
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If your 02's were bad you would notice the car to run better when cold, openloop than when it's gets up to normal temp. One way to check for a clogged cat is to hookup a vacuum gauge to the car and in neutral rev the motor up to 3k rpm. If the the gauge reading goes up then there's not any exhaust restrictions. If it doesn't go up or goes down then you have a glogged cat.