Gassy smell comming from car
10/22/09, 03:50 PM
#1
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Gassy smell comming from car
I haven't posted on here in some time but hello to all! For about the past two weeks I have been getting a stong gassy/exhaust smell comming from my car. I can't even drive with the ac on because it smells like a straight exhaust/gassy smell is comming through the vents! It's so bad that after driving I can't even park my car in the garage with the garage door closed because the smell is so strong. I don't have offroad pipes (I know what that smells like), only highflow cats. I have had my current exhaust set up for about six months with no problems (Highflow cats/prochamber/pypes mid muffler). What could be causing this strong gas smell to come out of no where?
10/22/09, 07:57 PM
#3
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Check your PCV system, maybe it's clogged? That gassy smell is exactly like what blowby smells like and the cabin air system intake is in the engine bay....
Actually, if you have a Paxton, do you have an oil-catchcan/seperator or breathers?
Actually, if you have a Paxton, do you have an oil-catchcan/seperator or breathers?
10/22/09, 10:00 PM
#4
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You should start with the obvious and make sure none of your gas lines, rails, and injectors are leaking. There's a dye you can add to the fuel system to help you pinpoint any leaks.
10/22/09, 10:28 PM
#5
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You state it's a gassy or exhaust like smell. Do you know what it is precisely? If it's the smell of raw fuel, then definitely start checking fuel lines, pcv hoses, etc. if it's an exhaust smell, you've probably got an exhaust leak at one of the mid-pipe connections to the manifolds.
If for instance you have an exhaust leak at the manifold on the passenger side, this could cause both issues.
The front oxygen sensor on the passenger side is located in the exhaust down pipes, and thus the leak would be in front of the sensor the car uses to measure air fuel ratios. Since a leak will introduce fresh air to the pipes before this sensor, the computer will read this as a lean condition and dump more fuel into that engine bank.
This of course will richen the fuel air mix when it doesn't need to be. You'll then likely have a raw fuel smell from the engine's probable inability to burn the additional fuel that is being given to it.
If for instance you have an exhaust leak at the manifold on the passenger side, this could cause both issues.
The front oxygen sensor on the passenger side is located in the exhaust down pipes, and thus the leak would be in front of the sensor the car uses to measure air fuel ratios. Since a leak will introduce fresh air to the pipes before this sensor, the computer will read this as a lean condition and dump more fuel into that engine bank.
This of course will richen the fuel air mix when it doesn't need to be. You'll then likely have a raw fuel smell from the engine's probable inability to burn the additional fuel that is being given to it.
Last edited by jlmounce; 10/22/09 at 10:32 PM.
10/22/09, 11:55 PM
#6
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Thread Starter
You state it's a gassy or exhaust like smell. Do you know what it is precisely? If it's the smell of raw fuel, then definitely start checking fuel lines, pcv hoses, etc. if it's an exhaust smell, you've probably got an exhaust leak at one of the mid-pipe connections to the manifolds.
If for instance you have an exhaust leak at the manifold on the passenger side, this could cause both issues.
The front oxygen sensor on the passenger side is located in the exhaust down pipes, and thus the leak would be in front of the sensor the car uses to measure air fuel ratios. Since a leak will introduce fresh air to the pipes before this sensor, the computer will read this as a lean condition and dump more fuel into that engine bank.
This of course will richen the fuel air mix when it doesn't need to be. You'll then likely have a raw fuel smell from the engine's probable inability to burn the additional fuel that is being given to it.
If for instance you have an exhaust leak at the manifold on the passenger side, this could cause both issues.
The front oxygen sensor on the passenger side is located in the exhaust down pipes, and thus the leak would be in front of the sensor the car uses to measure air fuel ratios. Since a leak will introduce fresh air to the pipes before this sensor, the computer will read this as a lean condition and dump more fuel into that engine bank.
This of course will richen the fuel air mix when it doesn't need to be. You'll then likely have a raw fuel smell from the engine's probable inability to burn the additional fuel that is being given to it.
Last edited by SONICBOOST; 10/22/09 at 11:57 PM.
10/22/09, 11:57 PM
#7
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I need to change my sig because I took the paxton off..
10/23/09, 07:02 AM
#9
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I would definently say its more of a raw fuel smell. When I pulled up to the mother in laws house today the first thing she said when comming to my passanger door was, "It smells like gas!", I was like uh oh lol. I'm gonna take it to a local shop to see exactly what the problem is.
Definitely second bigray's suggestion of checking the fuel system. Had a fuel relay valve stuck in the open position on my '90 TBird, you could smell gas inside and from 5 feet away outside.
11/5/09, 04:41 PM
#10
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We'll, whoever re installed my fuel rail and injectors didn't do a good job because I was leaking fuel out of the rail.. Oh we'll, it was a pretty simple fix and she runs perfect
Those are always fun and satisfying ones.
11/6/09, 09:42 AM
#13
11/6/09, 12:55 PM
#15
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11/6/09, 12:56 PM
#16
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11/6/09, 12:58 PM
#17
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11/6/09, 12:58 PM
#18
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11/6/09, 01:29 PM
#20
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