10.5 MPG ??? what is wrong with my car
#31
#32
@RAY it had been on for atleast a month and a half before it really started acting up,
@G35NYC. i changed the air filter a few weeks back also and it didnt change anything, also should i get a tune up before i change the clutch and headers and o2 sensors or after?
i got caught up with work for a few days so i wont be able to get the codes until this weekend. but i will post them as soon as i get them so check back and help me get this figured out please. i dont know a whole lot about car mods and stuff so all the help is appreciated
@G35NYC. i changed the air filter a few weeks back also and it didnt change anything, also should i get a tune up before i change the clutch and headers and o2 sensors or after?
i got caught up with work for a few days so i wont be able to get the codes until this weekend. but i will post them as soon as i get them so check back and help me get this figured out please. i dont know a whole lot about car mods and stuff so all the help is appreciated
#33
Seriously, don't do a thing until you get the codes. Your mods are fine. You don't need to take them off.
Like I say, get the codes first, but my guess is Passenger Side Camshaft Position Sensor. That will make your car do everything you have described - bad mileage, hard starting, CEL, etc. You're lucky to have a CEL on - at least that way you know you can read a code. Mine didn't even throw a CEL when it started acting up.
The other thing you should do is clean your MAFS, using CRC MAFS Cleaner. A dirty or bad MAFS can cause a myriad of other symptoms as well, also including everything you've described.
Do both of these before changing any O2 sensors.
Like I say, get the codes first, but my guess is Passenger Side Camshaft Position Sensor. That will make your car do everything you have described - bad mileage, hard starting, CEL, etc. You're lucky to have a CEL on - at least that way you know you can read a code. Mine didn't even throw a CEL when it started acting up.
The other thing you should do is clean your MAFS, using CRC MAFS Cleaner. A dirty or bad MAFS can cause a myriad of other symptoms as well, also including everything you've described.
Do both of these before changing any O2 sensors.
#36
#37
#38
#39
Lastly, get a tune so you can take full advantage of the mods.
#41
eturkov.blogspot.com/2010/10/diy-video-g35-spark-plug-replacement.html
I will help you out further by giving you the link to the sticky at the top of the sedan page. This will show you a number of DIY videos for service and a couple mods.
www.g35driver.com/forums/showthread.php?t=183421
A tune will remap your ecu to get the best performance out of your mods through out the entire RPM range. A lot of the members are running an Osiris tune, which gives you different maps/tunes to choose from (valet, econ, race, etc.)
Hope this helps, and good luck
#42
Replace the cam sensor first and reset the ecu by unhooking the battery and then pressing the brake pedal several times. Then see how it runs. The tuneup is a good idea if you have over 100k and it hasn't been done.
The p1273 could be a vacuum leak or intake leak. Could also be due to a Bosch O2 sensor if any have been replaced. Our cars don't like them. Use Denso sensors.
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