I have this 2008 Nissan Versa 1.8 hatchback and when the heater is on you could smell gas fumes coming out of the vents like a rich running engine. Under the hood after taking the plastic engine cover off the smell is very strong around the intake manifold and definitely smells like a rich mixture. I hooked up my Bluetooth scan tool and I read the short term fuel which average would be 3.4% and sometimes can hang around 8% and come back down to around zero. I tried spraying some brake cleaner around were the smell is coming from but nothing happened. I want to know how do you diagnose this issue? And probably some issues that could cause this. Thank You
mileage please?
159,476 miles. Transmission is automatic
If the oil smells like gas, then you have too much blow-by
If changing the PCV valve doesn't help then the engine is worn out.
Check for gasoline leaks. (The trick of spraying cleaner is for locating vacuum leaks and won't find a gas leak.)
I forget to mention I checked for gas leaks and there is none. The smell smells like a mixture of air and fuel but a rich mixture, coming around the intake manifold
A number of Nissan sites were showing similar issues with the gas smell coming through the vents.
Since the smell is strongest around the intake, you may have a fuel rail leaking (a very small leak and difficult to find).
Until you determine the source, my suggestion would be to have a fire extinguisher handy and be careful.
