Question about 2003 Lincoln Navigator

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I do have a check engine light i forgot the code but they explained the truck was running lean could the muffler cause this

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No. your air/fuel mixture is off. The car runing lean is not allways a bad thing you will get alot better gas milage. :)

let me know what code it was maybe i can help somemore

Posted on May 17, 2009

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Is engine running OK? If so and the muffler is an economy muffler, take it back to where you had it installed and see what they will do for you. If the engine IS NOT running right , it may be running to lean and tat causes an overly hot exhaust system. You may need to have the engine diagnosed for performance issues.

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2004 F150 5.8 Triton has a hesitation problem and slight backfire. We are in Belize where gas is not always filtered as in the states. We've changed the fuel filter 3 times in the last year but still...

That sounds to me like a bad oxygen sensor and/or a bad throttle position sensor. Is the "Check engine" light on? If it is, have someone check the problem codes. Either one of these will show up as a code. Either of these sensors can cause the fuel mixture to be too lean. A lean mixture can cause both of these problem. If the backfire is in the engine and not the muffler, that us almost always caused by a lean mixture. Since the fuel filter has not helped, I doubt that is the problem. If the engine has a spark knock on acceleration or hard pull, the fuel could be to low octane. If the knock is happening, you can get octane boosters to add to the tank of gas. Good luck.


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Check engine light on, but no drivability issues, no unusual sounds, runs perfect but the light is worrying me. would a loose muffler possibly cause the light to turn on?

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If not, it could be caused by anything from a crack in a vacuum line to a bad fuel pump. (Anything that could make the engine run lean.)

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