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My 2007 cobalt ls kind of sputters or pops almost like a small backfire when I slow down from 5th gear not only that but I smell exhaust in the cabin so I'm assuming I have a leak somewhere my question is would a short ram intake or muffler I put on affect that and how much could it cost

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It sounds like you have distrurbed the fuel/air mixture. Any change in intake or exhaust pressure will do this. When allowing more air in, or a free flowing exhaust, or a leak in the exhaust, it will cause the mixture to become leaner unless the computer is reprogramed. This will cause a popping when decelerating.

Posted on Feb 15, 2014

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Posted on Jan 02, 2017

ginocussen
  • 216 Answers

SOURCE: honda vt 750 backfires

First check all spark plugs(NGK are a good brand) / HT leads / plug caps. Secondly, Check that the valves are properly gapped - if they are tight they will leak the cylinder gases past the valve(s) and this will cause a misfire. A losse or leaking manifold will also. if you have aftermarket pipes then it may need to be rejetted to suit. If you got them at a dealer they will know the right jets. I couldnt find an english manual but here is a german on that may help with diagrams etc... Good luck. Rate if good.
Thanks

http://www.carlsalter.com/download.asp?fileid=072111110100097095086084055053048095067045067050086095039057055095040103101114109097110041046112100102

Posted on Mar 26, 2009

  • 112 Answers

SOURCE: Havin problem with 5th gear (OD) Bike slows down

Sounds like the clutch might be going bad.

Posted on May 17, 2009

wayneman01
  • 301 Answers

SOURCE: i took off the plate rester off the stock muffler

The backfiring won't harm anything, it is just annoying. You can reduce the backfiring on deceleration to a minimum - or maybe eliminate it completely - by having the carburetors synchronized.

To be safe, you are probably going to be better off in the long run if you put the arrestor plates back in. Not just from a noise level concern but also because this modification may cause your allready lean-running engine to run even leaner. This can cause driveability problems in cold weather and perhaps a slight reduction in engine life.

Posted on Nov 01, 2009

  • 346 Answers

SOURCE: I have gas leaking from a hose that is protruding

The hose is a bowl vent from your caburetors, and the backfiring is due to excess fuel getting into your engine. It has nothing to do with your exhaust, yet.

Your bowl floars are sticking and allowing fuel to flow into the carbs even though the bowl is full. You have to take the bowl off, figure out why it's sticking, and repair it.

The exhaust will actually make your engine run lean a bit if you don't have any compensation equipment (EFI or electronically controlled fuel jet) on your bike, so you'll have to tune accordingly for it.

Posted on Jan 05, 2010

  • 635 Answers

SOURCE: backfiring on deceleration from exhaust pipes

May be running too lean or too rich. Check the color of your plugs, black dry and sooty means they are rich, white with blisters lean.

Posted on Apr 03, 2010

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