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Unread 12-08-2011, 02:55 PM   #1
gloaming
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1996  
 
Join Date: Oct 2011
Location: Albuquerque, NM
Posts: 16
Exhaust problem?

I've been having another problem with my '96 Jeep Grand Cherokee Laredo since replacing my PCM last week. About ten days ago, my Jeep backfired (which it did often until I replaced the PCM) and suddenly the engine noises were EXTREMELY loud. It sounds almost like a jet taking off when I accelerate, and there seems to be loss of power. Could there be an exhaust leak somewhere? Thanks!

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Unread 12-08-2011, 03:40 PM   #2
Fishsammich
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Join Date: Nov 2011
Location: Elkhart, IN
Posts: 6
Yes backfire and after-fire create an amazing amount of excess pressure on an exhaust system and 1 or more of these can and will destroy the exhaust system.

Almost all vehicles '90 give or take and newer are quite sensitive to exhaust leaks, lose of back pressure, o2 sensors not coming up to or maintaining temperature and sending the ECU into a fault mode that allows the vehicle to run rich (a little extra fuel for the same amount of air) for over heat protection and the fuel economy and power suffer.

Not to mention the CO2 and other noxious gasses that might find a way into the interior space is amplified,,,
VERY UNHEALTHY. GET YOUR EXHAUST inspected and fixed asap
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Unread 12-08-2011, 03:56 PM   #3
gloaming
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1996  
 
Join Date: Oct 2011
Location: Albuquerque, NM
Posts: 16
Thanks for the reply!
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Unread 12-08-2011, 04:13 PM   #4
JasonStebbins
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1997 ZJ 
 
Join Date: Jan 2009
Posts: 3,138
The jet taking off and loss of power sound like a malfunctioning fan clutch.
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