2005 Mitsubishi Endeavor

Hi McGrifken,

Thank you for the donation.

When the exhaust smells like rotten eggs, the cause should be from the catalytic coonverter. With the A/C turned on, the engine could be running richer than it should.

Get the catalytic converter checked first.

The vibration duirng accelerating and engagement of the 2nd gear indicates the trans might be failing and the 2nd clutch is faulty.
This would require pressure testings to confirm if it is hydraulically inclined or mechanical.

What could cause the engine to run rich? Also, I just got back from driving the car and the shaking doesn't happen between gears. It's when I'm first accelerating for about 1 second and then it runs fine.

The jerking indicated could be misfirings and that would cause the engine to run rich, at least for one cylinder. When any cylinder misfies, fuel is not burnt and this fuel would get thrown out through the exhaust system.

Shaking during acceleration indicates possible faults with the spark plugs and/or related parts.

I responded to a similar question about the 'egg smell' from another post. I have it ,too. Ours is a 2005 Endeavor with approx 57,000 miles. The smell comes and goes, is very unpredictable, and unfortunately for us, did NOT happen when I shipped it in to the dealer :/ TODAY, our issue is a rattling noise on acceleration. Its as if when you accelerate, and ONLY when you push the gas pedal--- it sounds as if you were blowing across a sheet of paper, or blowing into a fan... That rattling-type noise that would result. Upon inspection at home, all parts on the muffler seem to be intact. It sounds as if it is coming from inside the hood/engine area-- versus outside the car/below the passenger area or tailpipe. I am at a loss on this one. Any ideas would be a great help. Thanks!

Have the catalytic converter checked. Rotten egg smell are most likely to be from a bad converter and the rattling noise indicates the inner parts have disintegrated.

Use a mallet to tap the converter to test for rattling noise.

Thanks, KHLow2008... I will have to have the cat converter checked now. At least I know Im not going crazy telling the dealer something that wouldnt happen when I brought it in last time. Unfortunately, my warranty is now up..it wasnt back then.... I dont know how theyre going to deal with this one. :/ I found my rattling noise to be nothing more than a loose/broken off piece of shield/guard- whatever it is technically called. Unfortunately,again, only a dealer can order it around here. So, off I will go. Back to the dealer. :/ Attached is a pic of what shield I am talking about. Thanks :)

That is the heat shield for the exhaust and are quite common for them to cause vibrating noise.

Good luck for your visit to the dealer. hoep they are able to come up with a good remedy for you.

Happy New Year.

Thanks, KHLow2008... I did take it to the dealer today. They informed me that Mitsubishi tells them to 'just rip it off'. We'll see how this goes. I go in Thursday. Theyre going to 'look at' my cat converter, but since there is 'no engine light, or codes, we can't do anything for you'.... How convenient. But hey, its going to be documented TWICE in my file, so...... :/ I got 9 more months of warranty, I found out, so THAT was a nice tidbit of info....It'll be close if I hit the 60000 miles first, or the 5 years. :)
Thanks for all your input. Have a great New Year,too :)