Need Help in dignosis: 2004 Infi G35 - First misfire, Now won't start
#1
Need Help in dignosis: 2004 Infi G35 - First misfire, Now won't start
Hello Guys,
I am new to this forum and first time infiniti owner. I got 2004 G35 automatic 3 months ago with 127k miles on it. the car was in good condition before it ran low oil (I failed to notice: My ignorance) and I had to replace Valve cover gasket and MAF sensor.
Now after 1 month of the replacement, it started misfiring. I checked the code with OBD2 and it was P0301 Cyl 1 misfire. I didn't drive the car after I read the code for 1 week (waiting for spark plugs to arrive) and thought of replacing all the spark plugs first. Before my spark plugs could arrive, when I was trying to start the car just to make sure everything else was fine, it wouldn't start! I went ahead and replaced all the 6 spark plugs when they arrived and it still WOULDN'T START. It is cranking, battery is fine but would fire the engine. I knew 1 spark plug or 1 ignition coill wouldn't prevent the entire 6 cylinder engine from starting. So I checked all the fuses, fuel pump.. they seemed working. Then checked whether the spark plug was sparking by taking it out of the engine.. and it DIDN"T SPARK (Checked 3 spark plugs)! So I am certain that there is some electrical problem that is not letting the sparkplugs work.
Kindly suggest any other diagnosis methods so that I can pin point the problem area. Also suggest if there are any other possibilities that can cause the car not to start.
Thanks,
Sanchamp411
I am new to this forum and first time infiniti owner. I got 2004 G35 automatic 3 months ago with 127k miles on it. the car was in good condition before it ran low oil (I failed to notice: My ignorance) and I had to replace Valve cover gasket and MAF sensor.
Now after 1 month of the replacement, it started misfiring. I checked the code with OBD2 and it was P0301 Cyl 1 misfire. I didn't drive the car after I read the code for 1 week (waiting for spark plugs to arrive) and thought of replacing all the spark plugs first. Before my spark plugs could arrive, when I was trying to start the car just to make sure everything else was fine, it wouldn't start! I went ahead and replaced all the 6 spark plugs when they arrived and it still WOULDN'T START. It is cranking, battery is fine but would fire the engine. I knew 1 spark plug or 1 ignition coill wouldn't prevent the entire 6 cylinder engine from starting. So I checked all the fuses, fuel pump.. they seemed working. Then checked whether the spark plug was sparking by taking it out of the engine.. and it DIDN"T SPARK (Checked 3 spark plugs)! So I am certain that there is some electrical problem that is not letting the sparkplugs work.
Kindly suggest any other diagnosis methods so that I can pin point the problem area. Also suggest if there are any other possibilities that can cause the car not to start.
Thanks,
Sanchamp411
#2
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Hello Guys,
I am new to this forum and first time infiniti owner. I got 2004 G35 automatic 3 months ago with 127k miles on it. the car was in good condition before it ran low oil (I failed to notice: My ignorance) and I had to replace Valve cover gasket and MAF sensor.
Now after 1 month of the replacement, it started misfiring. I checked the code with OBD2 and it was P0301 Cyl 1 misfire. I didn't drive the car after I read the code for 1 week (waiting for spark plugs to arrive) and thought of replacing all the spark plugs first. Before my spark plugs could arrive, when I was trying to start the car just to make sure everything else was fine, it wouldn't start! I went ahead and replaced all the 6 spark plugs when they arrived and it still WOULDN'T START. It is cranking, battery is fine but would fire the engine. I knew 1 spark plug or 1 ignition coill wouldn't prevent the entire 6 cylinder engine from starting. So I checked all the fuses, fuel pump.. they seemed working. Then checked whether the spark plug was sparking by taking it out of the engine.. and it DIDN"T SPARK (Checked 3 spark plugs)! So I am certain that there is some electrical problem that is not letting the sparkplugs work.
Kindly suggest any other diagnosis methods so that I can pin point the problem area. Also suggest if there are any other possibilities that can cause the car not to start.
Thanks,
Sanchamp411
I am new to this forum and first time infiniti owner. I got 2004 G35 automatic 3 months ago with 127k miles on it. the car was in good condition before it ran low oil (I failed to notice: My ignorance) and I had to replace Valve cover gasket and MAF sensor.
Now after 1 month of the replacement, it started misfiring. I checked the code with OBD2 and it was P0301 Cyl 1 misfire. I didn't drive the car after I read the code for 1 week (waiting for spark plugs to arrive) and thought of replacing all the spark plugs first. Before my spark plugs could arrive, when I was trying to start the car just to make sure everything else was fine, it wouldn't start! I went ahead and replaced all the 6 spark plugs when they arrived and it still WOULDN'T START. It is cranking, battery is fine but would fire the engine. I knew 1 spark plug or 1 ignition coill wouldn't prevent the entire 6 cylinder engine from starting. So I checked all the fuses, fuel pump.. they seemed working. Then checked whether the spark plug was sparking by taking it out of the engine.. and it DIDN"T SPARK (Checked 3 spark plugs)! So I am certain that there is some electrical problem that is not letting the sparkplugs work.
Kindly suggest any other diagnosis methods so that I can pin point the problem area. Also suggest if there are any other possibilities that can cause the car not to start.
Thanks,
Sanchamp411
Did you check for a blown fuse if you are not getting spark?
http://www.nicoclub.com/FSM/G35/Sedan/2004/ec.pdf
See page EC-133, 307
http://www.nicoclub.com/FSM/G35/Sedan/2004/sc.pdf
See page SC-9, SC-15
Good luck
Telcoman
#3
Hello Telcoman,
Thanks for the information. I checked all the plugs, they were getting the supply. So I tried jump starting the car again and it didn't. I was disappointed and ready to go to a mechanic just before giving a last try. I turned the key to start and this time I could sense the engine trying to start. So tried another time this time with full throttle... and guess what! The car STARTED!! Engine codes vanished. I could smell a lot of unburned fuel though. Probably because of thousands of cranks I gave it. Now it is starting and running perfectly well.
The question still lies though that why did it not start all the week? I did try it with full throttle many times. I do not know. Hopefully it will run smoothly.
Thanks,
Sanchamp411
Thanks for the information. I checked all the plugs, they were getting the supply. So I tried jump starting the car again and it didn't. I was disappointed and ready to go to a mechanic just before giving a last try. I turned the key to start and this time I could sense the engine trying to start. So tried another time this time with full throttle... and guess what! The car STARTED!! Engine codes vanished. I could smell a lot of unburned fuel though. Probably because of thousands of cranks I gave it. Now it is starting and running perfectly well.
The question still lies though that why did it not start all the week? I did try it with full throttle many times. I do not know. Hopefully it will run smoothly.
Thanks,
Sanchamp411
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