Exhaust problem? - JeepForum.com
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > Exhaust problem?

Introducing MONSTALINER™ UV Permanent DIY Roll On Bed LineFS: 2007-2013 Jeep Wrangler "HALO" Angel Eye KitFS: Wranger BRIGHT License Plate LED! Just $3! Great value

Unread 12-08-2011, 02:55 PM   #1
Registered User
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!

gloaming is offline   Reply With Quote
Unread 12-08-2011, 03:40 PM   #2
Registered User
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
Fishsammich is offline   Reply With Quote
Unread 12-08-2011, 03:56 PM   #3
Registered User
Join Date: Oct 2011
Location: Albuquerque, NM
Posts: 16
Thanks for the reply!
gloaming is offline   Reply With Quote
Unread 12-08-2011, 04:13 PM   #4
JasonStebbins's Avatar
1997 ZJ 
Join Date: Jan 2009
Posts: 3,128
The jet taking off and loss of power sound like a malfunctioning fan clutch.
Common ZJ problems and how to fix them by JasonStebbins

12 things to do when your ZJ stalls by ZeeJay1997
JasonStebbins is offline   Reply With Quote
Thread Tools

Suggested Threads

Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.