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Changed battery and sounds like holes drilled in muffler

zman1858

By zman1858
in 986 Series (Boxster, Boxster S)

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zman1858 Member

zman1858

Posted
Posted (edited)

1998 boxster...Changed battery and now sounds like holes drilled in muffler.....very loud when starting, idle off...runs fine,no power loss...sound gets a little better in 5th gear. There is a small vacuum leak in one fuel injector (will fix when cooler weather),never effected much. The loud muffer sound is from the driver side. Unhooked mass flow, same thing....help...car sounds likea 16y/o kids honda civic with the jacked up muffler that always wants to race.....

Edited by zman1858
zman1858 Member

zman1858

Posted
  • Author
Posted (edited)

The exact same kind that came out....what does that matter.......sounds gets better as I drive, but still loud,,,possble plug fouled out ?????...I am going to change them tomorrow

Edited by zman1858
mikefocke Member

mikefocke

Posted
Posted (edited)

The ECU has to relearn after a battery is disconnected for a while. Other than the battery being loose or the mounting hardware, can't think of another reason the battery would affect the sound ... unless the car hadn't been run for a while and the injectors got all fouled up. Any codes being thrown?

Edited by mikefocke
  • Upvote 1
zman1858 Member

zman1858

Posted
  • Author
Posted (edited)

daily driven....changed plugs, runs better...a leak in the catalytic converter appeared from no where. There wasn't one there before....very strange. I can feel the air when I put my hand up to it. If I run straight pipes and remove the cat's. what do I do with wires from the O sensors

Edited by zman1858
mikefocke Member

mikefocke

Posted
Posted

You need to keep those O2 sensors plugged in and sending the right signal or your engine management will throw codes and affect any anti-smog inspection. Not to mention you don't want a constant CEL on as it could mask any future problem. So how about a used CAT from a junk yard or someone parting out a car for a racer? Or what are called sports cats? As long as it has the bung to screw in the sensor.

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