G35 Sedan V35 2003-06 Discussion about the 1st Generation V35 G35 Sedan

Car suddenly sounds quieter??....

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Old 05-10-2019, 01:29 PM
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05 Infiniti G35 Sedan
Question Car suddenly sounds quieter??....

Hello, I have a G35 sedan and i have been running it with a resonator and muffler delete for the past year and about two days ago i noticed that car sounded a lot quieter than it normally is. I have had no recent maintenance done to the car whatsoever. The only thing to note is that i noticed my car was quieter after getting some gas. Could bad gas somehow cause the car to sound quieter? Friend suggested it could be my catalytic converters. Anyone else ever had this issue?
 

Last edited by autog354x; 05-10-2019 at 09:43 PM.
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Old 05-11-2019, 11:19 AM
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Yep, it's happened to me before, you probably got some bad gas with low octane.
 
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Old 05-11-2019, 11:37 AM
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Originally Posted by [email protected] View Post
Yep, it's happened to me before, you probably got some bad gas with low octane.
Did the issue fix itself? I ran through the bad gas and currently have it running on 93 octane.
 
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Old 05-11-2019, 12:01 PM
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The only time it ever happened to me it was immediately fixed with the next tank of fuel.
 
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Old 05-11-2019, 12:39 PM
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I am about to run out of gas that i put in after this issue started happening and it still persists. I wasn't even sure if ECU reset would help but i did it anyways and didn't make a difference. If it were the catalytic converters i assume they would throw a code wouldn't they?
 
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Old 05-11-2019, 10:51 PM
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Not necessarily, the downstream sensors won't throw a code until the data they're sending is out of spec. You can have melted spots in the cats and still have a running engine, Is there any chance that you got a bunch of water up into the muffler or something? I've seen wierd things happen like people parking right next to a high pressure sprinkler in a park that actually worked water back up into a muffler although it wasn't really a "muffled" sound it just sounded like complete **** and was belching water out when he was on the throttle. Took a week to finally get it all evaporated though.
 
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Old 05-12-2019, 12:59 PM
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Originally Posted by [email protected] View Post
Not necessarily, the downstream sensors won't throw a code until the data they're sending is out of spec. You can have melted spots in the cats and still have a running engine, Is there any chance that you got a bunch of water up into the muffler or something? I've seen wierd things happen like people parking right next to a high pressure sprinkler in a park that actually worked water back up into a muffler although it wasn't really a "muffled" sound it just sounded like complete **** and was belching water out when he was on the throttle. Took a week to finally get it all evaporated though.
The thing is that im running a pipe straight back from the cats. No resonator or muffler is present. Car is usually parked on an incline and there is no sprinkler system nearby. Would adding dry gasoline help get rid of water you think?
 
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Old 05-12-2019, 02:11 PM
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I'd say at this point it would be a good idea to disassemble the exhaust and see if there's something wrong with it or the cats. The bends on the cats makes it hard to see the element itself but you can with an inspection mirror and flashlight.
 
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Old 05-15-2019, 08:09 PM
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So it looks like the issue resolved itself...took some time but car sounds normal now. Thanks for your help Cleric!
 
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Old 05-15-2019, 11:36 PM
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Yep, sounds like bad gas. Glad it's all fixed
 
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