Do I need a tune up?
#1
Do I need a tune up?
Hi, I've owned my 2003 G35 coupe for about 2 months now and I'm wondering if I should get it checked out. The car runs great but I'm getting an average of 13mpg. My wife drives the car everyday day to school, which is a 10 minute drive. I know the short runs are not the greatest for fuel economy, but I was still expecting a lot better, especially since it's so much lower than what Infiniti claims it should get. I’m not expecting great fuel economy from this car but I’m wondering if there is maybe a problem that’s more serious and the poor fuel economy is an indication of the problem. The car is not driven hard and I just recently had an oil change and put in a new air filter, I was going to have the fuel filter changed but the guys at the oil change place didn’t know where the filter was, so I guess I’ll have to have it done at the dealership. If anyone has some advice it would be appreciated.
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#7
Originally Posted by GWord256
Ouch that sucks. I just got 23mpg+ on my last tank. 23.426 to be exact. I always write down my miles on my Gas receipts. Even my worst was above 18mpg.
Something is terribly wrong there. I hope you and your wife are putting in the correct gas.
Something is terribly wrong there. I hope you and your wife are putting in the correct gas.
I reset my ECU, but I guess I wont know if it worked until after a few days.
The crazy thing is I had a 1997 Formula Firebird with a 350 in it before this car and it got about 18-20 mpg, I was really shocked when I started getting worse gas mileage from a car with less power and a smaller motor.
Last edited by Jono; 03-17-2007 at 02:16 AM.
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#8
Originally Posted by Jono
We're putting in the right gas, I know that’s not the problem. I do the same thing as you, I write down the miles on the receipts, the best I ever got was 16 mpg, and that was mostly highway miles.
I reset my ECU, but I guess I wont know if it worked until after a few days.
The crazy thing is I had a 1997 Formula Firebird with 350 in it before this car and it got about 18-20 mpg, I was really shocked when I started getting worse gas mileage from a car with less power and a smaller motor.
I reset my ECU, but I guess I wont know if it worked until after a few days.
The crazy thing is I had a 1997 Formula Firebird with 350 in it before this car and it got about 18-20 mpg, I was really shocked when I started getting worse gas mileage from a car with less power and a smaller motor.
hopefully reseting the ECU fixed your problems!
lets hope!
#9
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Originally Posted by GWord256
Ouch that sucks. I just got 23mpg+ on my last tank. 23.426 to be exact. I always write down my miles on my Gas receipts. Even my worst was above 18mpg.
Something is terribly wrong there. I hope you and your wife are putting in the correct gas.
Something is terribly wrong there. I hope you and your wife are putting in the correct gas.
23?! you drive thing like a girl or what?!
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Originally Posted by Jono
Thanks for the advice, I will try resetting the ECU. The car has 45,000 km's (28,000 miles) on it, so the plugs should still be good, but you never know.
be fouled..pull 1 out from both sides and take a look see
#12
Get a reputable shop to do a proper fuel system service including MAF and TB cleaning; our VQ's don't need tuning till we pass 100K and there is actually nothing to "tune" except changing of the plugs and the service I just described...
Also, It is stupid to re-flash etc. without doing the complete fuel system service, but both would be a huge improvement.
Also, It is stupid to re-flash etc. without doing the complete fuel system service, but both would be a huge improvement.
#13
I reset the ECU and that did nothing, so yesterday I replaced the spark plugs. The first plug I took out, I think it's cylinder 2, looked like it had oil on it, all the other plugs seemed to be dry though. I'm going to run the car for a couple days and pull the plug again and see what it looks like, hopefully I don't have a problem, but if I do the car still has warranty. What do guys think? Thanks.
#14
As much as I hate to say this these cars are really bad when it comes to fuel economy. I work 10 minutes away ( city driving ) and if I'm lucky I get 225-250 per tank. Now on the expressway I get up to 350 miles per tank running it. So go figure. I would recommend taking it to the dealer and have it checked out.
#15
Originally Posted by htownboy
Get a reputable shop to do a proper fuel system service including MAF and TB cleaning; our VQ's don't need tuning till we pass 100K and there is actually nothing to "tune" except changing of the plugs and the service I just described...
Also, It is stupid to re-flash etc. without doing the complete fuel system service, but both would be a huge improvement.
Also, It is stupid to re-flash etc. without doing the complete fuel system service, but both would be a huge improvement.