NOTED A SWEET SMELL WHEN RUNNING,
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2004 Nissan 350Z Question: MY CAR IS REPORTING PO172,I HAVE CLEAN MAF,CHECKED FOR LEAKS,THE CAR RUNS FINE
Answer #1lightsaber August 03, 2013, 09:23Technician
P0172 = System too rich bank 1 which is the side of the engine with the #1 cylinder for a V-6, or V-8. On a 4 cyl engine the code effects the whole engine. How clean is your air filter?
ReplyD BRADEN, August 04, 2013, 00:25Rookie
will try replaceing air filter
the smell i am smelling is alot like the car is running rich,but would the effect the car preformance? the car runs fine with no noted power lose, i hope that it as easy as a air filter,will change tommorrow and will let you know,
thank for the info.
Replylightsaber, August 04, 2013, 05:23Technician
The PCM sets the too rich code because it is beyond the limits of adjustment the pcm has.
Other possibilities include excessive fuel pressure, leaking injectors, clogged IAC valve or passage, malfunctioning TPS, MAF, MAP or ECT sensor, malfunctioning EGR system, restricted exhaust, or malfunctioning canister purge system, or a lazy oxygen sensor, according to the Haynes manual.
A sweet smell from the exhaust usually indicates burning antifreeze, as in a blown head gasket.