Question about 2006 Infiniti G35

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2006 g35x, hard starting and shutttering, loss of excelleration. When I pump the gas with the key in the on postion before starting, it will start up a little better, and drive with full power. I have changed the tps, #1 coil and the spark plugs all genuine from dealer. Codes in the begining were Po301 changed coil 1 then second code read P0300 multiple miss fire changed tps. Vehicle is still driving the same way. At this point I will have to have a fuel pressure test done to see if it's the pump or fuel pressure regulator? any ideas?

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  • Infiniti Master
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I would have the fuel pressure tested and also see if the MAF sensor is within specs, the MAF will not set a code in most cases.

Posted on May 05, 2017

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Posted on Jan 02, 2017

  • 36 Answers

SOURCE: engine light on scanned p0300 po301 and another

P0300 indicates one of the following
Spark plugs,
Ht Leads,
Injectors.
ignition coil.
low compression
P0301 indicates one of the following on cylinder one
engine mechanical fault (low compression)
wiring.
ignition / fuel
injector.
ECT/MAF sensor.
ECM.

not that i need to tell you but you have a misfire on cylinder one, check the spark plug <> HT lead <> injector <> low compression, as the coil supplies a spark to all cylinders i would rule that out for now apart from a visual check,




Posted on Mar 18, 2010

ZJLimited
  • 17970 Answers

SOURCE: Infiniti G35 - 2006 Sedan

Smoke on start? Could be a valve problem where all your oil is in the bottom at start? Belts are squeaking too? Maybe a tensioner went bad?

Saw this service bulletin---

TAPPING / KNOCKING NOISE FROM ENGINE AT COLD START
This bulletin amends ITB02-049. This version amends the Applied Vehicles.
Please discard all paper copies of the earlier version.
APPLIED VEHICLE: 2002 - 2004 Q45 (F50)
2003 - 2004 M45 (Y34)
2003 - 2004 FX45 (S50) with V8 engine.
IF YOU CONFIRM:
A tapping or knocking noise (similar to a piston or valvetrain noise) when starting a cold engine,
NOTE: The engine is considered “cold” when it has been OFF (not running) for several hours.
ACTIONS:
1. Dislodge and remove any carbon deposits that may have caused the noise and confirm that carbon
deposits were the cause of the noise.
• While the noise is occurring, quickly rev the engine several times to approximately 4,000 RPM. Then
release the accelerator quickly, as soon as the engine reaches 4,000 RPM.
• The noise should disappear immediately if carbon deposits are the cause.
NOTE:
• If the customer reported a noise that exactly matches the symptoms listed above, but you cannot
duplicate it, the cause may still be carbon deposits. Go to step 2.
• If the noise does not stop after revving the engine, or you observe any other noise that doesn’t match
one described above, go back to ASIST for further diagnostic and repair information.
2. To prevent this incident from occurring again, add a bottle of Nissan In-Tank Fuel System Cleaner
P/N 999MP-FSC00P to a full tank of fuel (in the vehicle’s fuel tank) according to the instructions on the
label.
• This product is proven to reduce carbon deposits on pistons and combustion chambers, as well as
cleaning other components of the fuel system.

Hope helps.

Posted on Sep 08, 2010

ranunyenye26
  • 241 Answers

SOURCE: crank but does not start (Error code P0642)

p0642 = sensor reference voltage a circuit low voltage
p0300 = means random misfire
check firing order connections and must be in place.
check also cables especially the high tension cable and coils for required resistance.
primary = 1.0 to 0.5 ohms
secondary = 900 to 11,000 ohms (as requires per model)

Posted on Aug 15, 2012

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