Burning plastic smell leaking inside 2008 Jeep Grand Cherokee - JeepForum.com
 
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post #1 of 13 Old 10-17-2016, 06:09 PM Thread Starter
dannysheeks09
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Burning plastic smell leaking inside 2008 Jeep Grand Cherokee

I am desperately trying to figure out what's going on with our Grand Cherokee. Months back, my girlfriend and I were driving up into the mountains to do some skiing and we started to smell a burnt plastic odor(just like a hot glue gun smell). I pulled over and didn't see anything so we kept driving. The smell got stronger and stronger until we saw white colored smoke leaking inside the vehicle through the vents but mainly up through the center backseat cupholder area. Now this smell happens anytime we drive the Jeep for an extended period of time or when we attempt to drive up into the mountains.

We know that the exhaust system has some issues because it sounds pretty loud now. There is visual rust and some have rusted through some parts of the exhaust.

We've had it diagnosed multiple times. We were told the exhaust has some needed repairs but they also found a leaky trans pan as well as a leaky drive axle. They thought these fluids were leaking onto the exhaust. Due to financial restraints, we just repaired the leaks thinking because they were cheaper and we thought this would fix the terrible smell/smoke issue until we could afford to fix the exhaust too.

This did nothing. The exact smell happened in almost the same location, so we pulled over and shut the car off before it could start smoking. I waited about 5 minutes and when I tried starting the vehicle, it was incredibly bogged down and the RPMs were extremely low, so I shut if off immediately. It seemed to me have some sort of blockage in the exhaust. I let the car cool down for an hour, then it started normal so we drove home(cancelling our camping trip).

The last thing I want to do is now pay for the expensive exhaust repair and find that it didn't solve the issue either.

Does anyone have any suggestions, tips, insight on what the heck could be causing this?

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post #2 of 13 Old 10-17-2016, 07:04 PM
Jerry Bransford
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Moved to the WK Grand Cherokee section.

I'm no WK expert but that sure sounds like your heater core is leaking. I kinda doubt the low engine RPMs have anything to do with it.

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post #3 of 13 Old 10-17-2016, 07:48 PM
TurboDiesel
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what engine you got?

if its smoking mainly out of the middle console just pull it out and see whats up
takes 5 min to pull it...

2008 CRD // GDE Eco // DPF delete // 3" intercooler // OME HD // 265 dirtytracs etc.
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post #4 of 13 Old 10-17-2016, 09:32 PM Thread Starter
dannysheeks09
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Quote:
Originally Posted by TurboDiesel
what engine you got? if its smoking mainly out of the middle console just pull it out and see whats up takes 5 min to pull it...
5.7 liter Hemi V8. I just spent some time looking underneath the vehicle and around the engine. The exhaust is in pretty bad shape with rust and openings in various areas.

Also, I didn't see any more signs of fluid leaks underneath, but the coolant level was was slightly lower than it was the day I picked it up from the shop. They marked the level that day and its not dangerously low but it's about an inch or so below where it was.

But to clarify, the odor is not burning coolant. I am familiar with the smell of coolant and this is a much harsher, burning plastic smell(just like a strong hot glue gun). Just figured I'd mention it in case it sparks any ideas.
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post #5 of 13 Old 10-18-2016, 12:18 AM Thread Starter
dannysheeks09
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Would a clogged catalytic converter cause these issues? I've done a lot of reading and it sounds like this could be the culprit.
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post #6 of 13 Old 10-18-2016, 08:31 AM
TurboDiesel
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i was gonna say possibly a clogged DPF if you were diesel
not sure on the hot glue gun smell


usually when the heater cores go on these it leaks all over the passenger footwell

but the white smoke coming from the vents is the weird part, id be scared to drive it hahah
heat and everything still work fine?

2008 CRD // GDE Eco // DPF delete // 3" intercooler // OME HD // 265 dirtytracs etc.
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post #7 of 13 Old 10-18-2016, 09:39 AM
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Quote:
Originally Posted by dannysheeks09 View Post
I am desperately trying to figure out what's going on with our Grand Cherokee. Months back, my girlfriend and I were driving up into the mountains to do some skiing and we started to smell a burnt plastic odor(just like a hot glue gun smell). I pulled over and didn't see anything so we kept driving. The smell got stronger and stronger until we saw white colored smoke leaking inside the vehicle through the vents but mainly up through the center backseat cupholder area. Now this smell happens anytime we drive the Jeep for an extended period of time or when we attempt to drive up into the mountains.

We know that the exhaust system has some issues because it sounds pretty loud now. There is visual rust and some have rusted through some parts of the exhaust.

We've had it diagnosed multiple times. We were told the exhaust has some needed repairs but they also found a leaky trans pan as well as a leaky drive axle. They thought these fluids were leaking onto the exhaust. Due to financial restraints, we just repaired the leaks thinking because they were cheaper and we thought this would fix the terrible smell/smoke issue until we could afford to fix the exhaust too.

This did nothing. The exact smell happened in almost the same location, so we pulled over and shut the car off before it could start smoking. I waited about 5 minutes and when I tried starting the vehicle, it was incredibly bogged down and the RPMs were extremely low, so I shut if off immediately. It seemed to me have some sort of blockage in the exhaust. I let the car cool down for an hour, then it started normal so we drove home(cancelling our camping trip).

The last thing I want to do is now pay for the expensive exhaust repair and find that it didn't solve the issue either.

Does anyone have any suggestions, tips, insight on what the heck could be causing this?
Hi dannysheeks09,
I am sorry to hear about the burning odor and smoke in your Grand Cherokee. We want to make sure your vehicle is safe and performing optimally, so if you decide to take it in for a diagnosis please feel free to reach out with your VIN and contact information—I would be happy to help you set up an appointment at a certified Jeep dealer.

Anna
JeepCares Social Media Specialist
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post #8 of 13 Old 10-18-2016, 09:42 AM Thread Starter
dannysheeks09
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Yeah pretty much everything runs great besides the smell and it's loud due to the exhaust issues. If it were my car, I'd probably keep driving it until I regretted it but I can't have the lady keep driving it. My plan is to just take it to an exhaust repair shop and hope I don't get ripped off ha.
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post #9 of 13 Old 10-18-2016, 06:50 PM
TurboDiesel
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might be cheaper to buy an aftermarket exhaust and pay for install depending on how bad yours is if they have to weld and bend all new pipe...

never gotten a custom exhaust done tho hahah

2008 CRD // GDE Eco // DPF delete // 3" intercooler // OME HD // 265 dirtytracs etc.
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post #10 of 13 Old 10-18-2016, 07:52 PM
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Quote:
Originally Posted by Jerry Bransford View Post
Moved to the WK Grand Cherokee section.

I'm no WK expert but that sure sounds like your heater core is leaking. I kinda doubt the low engine RPMs have anything to do with it.
I'm with stupid there.. LOL

Heater core issue. Does the issue go away with the a/c and heater all turned off? Is the anti freeze level low? yes to either will point to heater core issue.

It's either the heater or or the blower motor motor going out. If no anti freeze loss then blower motor burning out. This will also go away if you turn off the blower motor / fan

Life is hard-John Wayne
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post #11 of 13 Old 10-18-2016, 07:57 PM
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And as a 2nd thought it could also be the guy driving the car in front of you.

Life is hard-John Wayne
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post #12 of 13 Old 10-18-2016, 09:18 PM
bensylrm
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I'm trying to think of anything plastic near the exhaust that may be melting or burning due to the exhaust leak. The emergency brake line runs near there... I can't think of any wires or something plastic like that in the area. Has the heat shield been compromised? What direction from what part(s) of the exhaust are affected? If the hot gasses are blowing sideways, it could be heating up and melting something a foot away. Pictures? Might be worth the time to poke your head under there and look all around. I tend to shove my cellphone camera where my eyes can't reach.

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post #13 of 13 Old 10-19-2016, 10:37 AM
Mp5ben
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Have you checked under your seats? A lot of wiring harnesses run under there and there are also air vents that can push the smell back and make it appear to come from no where. Maybe a wire is shortinf and getting the black tape around it very hot and smelly.
Other than that, have a friend follow you in another vehicle and look for any smoke while you're driving.

Also worth checking the valve covers and seeing if you have an oil leak that's burning off

05 WK Limited, HEMI 5.7, QD II, OME HD, 255/75/17 Mud terrains
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