Tried to search but didnt find solution...

Ok, car is 350z -04 manual with DE motor. Bought it as a project car and done some maintanance... and now it is back on road again

Car starts perfect when totally cold or "hot". Broblem is, when driven to normal temperature and let to cool down 20-30min, it takes a long to start the car (5-10sec)... It always starts, sputtering few seconds and then start to idle normally.

Recent maintanance ( <100 miles, which would possibly effect this):
-Spark plugs replaced
-Engine grounds cleaned
-Both cats and all o2&af sensors replaced
-intake manifold cleaned & gaskets replaced
-oem pvc replaced
-tb cleaned
-new battery

Otherwise bone stock except k&n intake, kinetix cats, unbranded exhaust. 130k miles. No error codes anymore (had few from old cats/sensors). Otherwise engine works fine, no missfires etc.

Suggestions?

 

camshaft sensors

 

always a good place to start and furthermore crankshaft position sensors.

Only get OEM Nissan or Hitachi.

It may be wise to clean your mass airflow sensor too

did you do the throttle body reset procedure?

 

I think i start with these, if no luck, then new cam+crank sensors.

Thanks!

 

I agree with bealljk and travlee. It is probably camshaft sensors or crankshaft sensors.

But.. Question: Are you reading any codes?

 

Not any codes.

 

I replaced both cam sensors and crank sensor. No luck

BUT, when i changed new fuel dampeners i noticed that system wont keep fuel pressure at all when engine stopped. So, next is fuel pump, i assume there is leaking non return valve somewhere in fuel pump assembly. Since car is high mileage, going to reolace whole assembly.

 

New Evap canister & fuel pump assembly (Hitachi), now it starts perfect cold, warm, hot



-evap canister got a quite big hole (!) on side
-fuel pump just old, new one "sounds" better (no loud whine)