Question about MagnaFlow 2003 Nissan Altima - 3.5L V6, with federal emissions system - Catalytic Converters

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My o3 V6 Altima cuts out while driving and sometimes difficult to start afterwards-smells like gas fumes code is PO345 What is it?

My o3 V6 Altima cuts out while driving and sometimes difficult to start afterwards-smells like gas fumes code is PO345. I`ve tried carb & injector cleaners but problem is still there. What is it?

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Repost in Cars and Trucks. This is inverters.

Posted on Nov 06, 2012

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The smoke test should have caught the problem provided the shop looked at the gas tank too. There can be a problem in the electric solenoid valving for the canister which can be concealing a leak beyond the solenoid valving. If the solenoid is closing off the flow, then it can also close off the leak.

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You should have the body computer scanned for trouble codes to find out whats going on with the ABS and traction control.
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The gas pedal was pressed too much before starting and now it doesnt start and it smells like gas a lot


It is flooded. Sometimes difficult to start afterward

if this is the case you have to floorboard the gas pedal - which floods the carb more so and keep it there for two minutes. Then try starting it. If and when it starts - ease off the gas or blow the engine.

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Sounds like the clutch is worn or the throw out bearing. You will need to have both checked. As far as the gas fumes go, check your air filter to make sure it doesn't need to be changed, if your fuel injected check to make sure you don't have leaks around your injectors. Finally check the gas fume collector for damage or bad vaum lines.

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When you fill the gas tank you can smell fumes but it is not leaking on the ground.


There are, of course, many possibilities, but if you are smelling fumes it is likely that they are coming from the engine compartment. If you smell the fumes when you first start the car, it may be that one or more of your fuel injectors have begun to leak. They are the four cylindrical devices connected to the fuel rail down low in front of the cover that is marked PGM-FI. You would be able to see dampness on one or another if it is leaking. Another possibility is a leak in the fuel line itself regarding its several connections. Without a manual and pics, it is difficult to indicate the positions of many parts, but if you trace your fuel line backward from your fuel rail to the fuel filter and so on, you might be able to find a leak. A VERY small amount of fuel will allow you to smell it, so I wouldn't expect to see gas flowing out somewhere. Sometimes, simple overflow from filling the tank will give you a short-term odor.
Sorry I can't be more help. A Haynes manual would be a good investment.

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It sounds like you've done everything else right. Have you consulted with the dealer you bought from? How about EcoQuest? If it's not the O3 level being too high, then perhaps there's something goofy with the unit. If it's under warranty, pursue that option. You should have contact infor with the unit; respond if you need it and I can post it.

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