Maybe exhaust issue

BRITTANY NICOLE ELINBURG EDWARDS

MEMBER
2001 JEEP GRAND CHEROKEE
4.7L
V8
2WD
AUTOMATIC
285,500 MILES

My vehicle listed above LE model idles rough and sometimes shuts off while idling. It has become loud more so when accelerating and sometimes sounds like it has a little back fire to it while driving, but does it when you let off the gas. You can smell the exhaust really bad outside the vehicle and feel heat coming from under the hood. While standing beside the vehicle and heat comes in through floor vents while driving. It tends to shut off often when you slow down but not always. Some days this issue is better than others. Heat gauge never gets over 1/2 way mark.

1 Reply

KASEKENNY

MECHANIC
18,907 POSTS

This sounds like multiple issues. The vehicle being louder while accelerating is most likely the exhaust has a hole in it. The only way to find this out is to visually inspect it where it sounds the loudest.

As for the running rough and stalling issue that sounds like a vacuum leak so here is a guide that will help with that. However, if you need more help with this issue we need to get a new post started because we need to keep each one to one topic. So let's keep this one on the exhaust issue.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

The heat blowing on the floor sounds like a possible blend door issue in the HVAC system but again this would be another issue so we need too get a post started for that one.

Basically, we just need to keep each post to one issue and the one that is listed on the heading. There are two main reasons for this. First, it is easier to work on one issue at a time. Second, others will not find these issues that are not listed under the heading if they have the same one.

Sorry for any inconvenience but let me know what you find with the exhaust. Maybe get a video of it idling so we can hear it and then rev it up. A failed exhaust has a distinct sound so we will be able to determine if that is it just by hearing it. Then we just have to find the location of the leak.