So I have had my g35S for about a month and a half. It ran great for a while. Recently It started feeling like its miss firing or hesitating under partial throttle in midrange. Also, when you go from low throttle to full while in gear it nosedives for a second from hesitation. It lags before it takes off pretty hard.

If under full throttle, at around 6500-6800 it just flatlines and acts as if I hit redline. No CEL either. Where do I start???

Info- Manual, 48K

 

If it's still under warranty I'd take it to the dealer and take them for a ride and show them exactly how it's acting up. If not I'd suggest resetting your ECU and driving the car hard for a while. If the person who had it before you drove it like a dog then the ECU might not be used to your driving style. Since you only have 48k I wouldn't think it would be your plugs but if the ECU reset doesn't help I'd investigate there next. Keep us updated as I'm sure you're not the only person to experience this. GL

 

Have your PCV valves checked

 

The previous owner drove it the opposite, i drive it way harder then he ever did. I'n guessing plugs as well sine i reset the ecu already. Could it be cas or cps?

 

+1 on taking it too the dealer. Assuming your posting in the right forum, you're still under warrenty

 

Thecar is now nodded w exhaust, suspension, and intakes.. I'd rather spare my self the trouble of taking it all off and driving over a 100 miles to the nearest stealership

 

If you put all those mods on recently, could need an ecu update or mapped correctly. Could be running too rich or lean or 02 is off. I read something about not disconnecting a certain "thing" when you do a throttle body clean.

Plus having it remapped would probably improve fuel economy and most other ailments you have

 

^---WHS

Adding exhaust and intakes could have changed the AF ratio to the point it fouled up your spark plugs or something. But the hesitation does seem like it has something to do with the air/fuel not being delivered correctly. Bad injectors, plugs, wires, could be lots of things.

 

Thats what I am thinking as well, the plugs might be fouled. I dont see injectors being an issue or coil packs just because of the low mileage of the vehicle. If they are, then shame on infinity for building such a piece of ****... Speaking of which, I am seeing more and more issues with the 07 g's..Dashes starting to come apart, window seals peeling, my front right brakes are making noise and are a month old, auto windows work when they want...sounds too much like a audi or a vw..