Exhaust overheating burning carpet in trunk

Asked by Chris Jul 10, 2016 at 02:01 PM about the 2004 Pontiac Grand Am GT

Question type: General

My car was running rough so I changed the
spark plugs and coil packs and now I'm
getting a horrible burning smell, carpet in
trunk is blackened burnt and HOT! But heat
shields are intact as far as I can tell and no
exhaust leaks. What could be causing this?
It didn't do this before I changed out the
spark plugs and coil packs.

5 Answers

101,595

How is the catalytic converter? When they get bad they can get red hot.

320

Have you been loosing performance lately, especially on hills? It could be a bad cat, Bad Injectors, Timing issue, Burnt out Exhaust valve.

Car is fine as far as I can tell. I found a wire not connected to a spark plug. Plugged it in properly, cleaned air filter too and test drove it ( city and highway speeds). Regained lost power, no more gas smell and metal floor of the trunk doesn't feel overly hot anymore. ( I pulled up the carpet, etc.) No longer running rough. But thanks!

Cat* is what I meant not car. Sorry, smart phones sometimes aren't so smart.

101,595

Okay, well a spark plug not plugged in would certainly cause a rough running engine lol. The air-fuel mix going into that cylinder wasn't being burned, and instead going into the exhaust where it did burn, hence the super hot exhaust. You must have been throwing O2 codes like crazy too.

1 people found this helpful.

Your Answer:

Grand Am

Looking for a Used Grand Am in your area?

CarGurus has 2 nationwide Grand Am listings and the tools to find you a great deal.

Postal Code:

CarGurus Experts

  • #1
    tenspeed
    Reputation
    10,970
  • #2
    james sparrow
    Reputation
    2,360
  • #3
    John Saffrahn
    Reputation
    2,280
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Honda Civic
193 Great Deals out of 4,001 listings starting at $440
Used Ford Mustang
40 Great Deals out of 1,622 listings starting at $5,977
Used Toyota Camry
44 Great Deals out of 1,139 listings starting at $2,500
Used Chevrolet Corvette
21 Great Deals out of 778 listings starting at $15,900

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.