8th Generation Honda Civic Forum - View Single Post - blow-by or something else, bad MPG

mamyta · 10-09-2008, 10:10 PM

Hi,

I have a 2007 Civic LX AT with about 14k miles on it.

When I pull the oil dip-stick out - there is a lot of compressed air coming out and plenty of gas fumes. could it be a blow-by? there is no black/white smoke coming out of the exhaust...

I've been experiencing bad mpg 22-24mpg (80% city). the engine is kind of sluggish and hesitates, some kind of power loss, accelerates slow...I'm experiencing these problems few months after I bought the car July 2007...

No trouble codes so far from the ECU. I've been 7-8 times to different Honda dealers - they are unable to do anything. according to them if there are no codes - the car is in perfect condition. I got the MAF and PCV valve replaced (I even paid for that even I still have warranty on the car...). Also put a new air filter as well - nothing helped so far...Tires are at 34psi, a little bit over but...

I've reset the ECU a couple of times - no difference at all...
Recent oil change (1 month ago) - no difference as well...

so my question is - could it be a blow-by and still it won't throw any codes?
I was baby-sitting my car during the brake in period and after that. I rarely go over 3500 revs... I can say - I'm driving it like my grandmother...

I can't make the dealers to run leak down test or compression test. they simply refuse. and I don't want to pay for it...Still have a plenty of warranty on my car...I have to open cases at Honda Motor Corporation - no assistance from them as well...

any suggestions?

10-09-2008, 10:10 PM	#1 (permalink)
mamyta Junior Member Join Date: Apr 2008 Posts: 11	blow-by or something else, bad MPG Hi, I have a 2007 Civic LX AT with about 14k miles on it. When I pull the oil dip-stick out - there is a lot of compressed air coming out and plenty of gas fumes. could it be a blow-by? there is no black/white smoke coming out of the exhaust... I've been experiencing bad mpg 22-24mpg (80% city). the engine is kind of sluggish and hesitates, some kind of power loss, accelerates slow...I'm experiencing these problems few months after I bought the car July 2007... No trouble codes so far from the ECU. I've been 7-8 times to different Honda dealers - they are unable to do anything. according to them if there are no codes - the car is in perfect condition. I got the MAF and PCV valve replaced (I even paid for that even I still have warranty on the car...). Also put a new air filter as well - nothing helped so far...Tires are at 34psi, a little bit over but... I've reset the ECU a couple of times - no difference at all... Recent oil change (1 month ago) - no difference as well... so my question is - could it be a blow-by and still it won't throw any codes? I was baby-sitting my car during the brake in period and after that. I rarely go over 3500 revs... I can say - I'm driving it like my grandmother... I can't make the dealers to run leak down test or compression test. they simply refuse. and I don't want to pay for it...Still have a plenty of warranty on my car...I have to open cases at Honda Motor Corporation - no assistance from them as well... any suggestions?
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