Rattling noise underneath

Tiny
SUSAN J. PATTERSON
  • MEMBER
  • 2008 JEEP LIBERTY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 71,600 MILES
First rattling noise was in the front part of the engine. I took vehicle to the dealership and they found that my water pump was in need of changing. That was done and the rattle started again as I was leaving. Took the vehicle back to the mechanic who could hear the rattle. The vehicle was put on the rack and two technicians checked underneath and could not find anything loose. The noise comes back at acceleration. The noise will not occur when idling on flat surface but occurs on slight upward incline idling. The noise sounds like a tin can rattling. Thanks.
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Sunday, July 9th, 2017 AT 4:54 PM

5 Replies

Tiny
HMAC300
  • EXPERT
It may be the converter is going bad if you bang on it with your hand and hear rattling that is good sign or maybe a plastic shield under engine hits or the converter shield rivets are broken. See link.
https://www.2carpros.com/articles/bad-catalytic-converter-symptoms
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Monday, July 10th, 2017 AT 6:52 AM
Tiny
SUSAN J. PATTERSON
  • MEMBER
After 3 weeks of rattling, the problem has been solved. I had other mechanics listen at the rattle. The problem was the starter. The insides became loose and would hit the flywheel on when going at a slight incline.
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Thursday, July 27th, 2017 AT 6:04 PM
Tiny
KEN
  • ADMIN
Nice work, we are here to help, please use 2CarPros anytime.

Cheers, Ken
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Friday, July 28th, 2017 AT 4:46 PM
Tiny
SUSAN J. PATTERSON
  • MEMBER
Thanks, Ken. It has been 3 weeks of troubleshooting. I would like to take this opportunity to explain all that I went through trying to determine what was going on. The rattling sound started and I immediately had the Jeep towed to the dealership. The mechanic who checked found my waterpump was shot. That was replaced and the rattle was still there. He checked the exhaust system, catalytic converter, heat shields. No problem there. Still had the rattle. Had another garage check for the rattle. No answers. Had a neighbor who was handy with cars listen to the rattle with a mechanics stethoscope and he heard the rattle at the idler pulley. I went back to the dealership and told the mechanic to check the idler pulley. It was bad and had it replaced. The rattle was still there. He told me that he had 74 Vega with the exact same rattle and it was the starter. The starter was pulled out and the insides were completely loose. He replaced the starter and the rattle was gone. It just goes that way sometime. I bought this Liberty brand new in 2008 and all I ever had done besides basic maintenance was replacing the brakes which is a common problem with Jeeps. The mechanic that did the repair has worked on my Jeeps since 1996. He had never heard this type of rattle with a Jeep starter just on a Vega from his teenage years. Again, thanks for the opportunity to explain this. And if anyone else gets this type of tin can rattle in the engine department to please check the starter.
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Saturday, July 29th, 2017 AT 1:28 PM
Tiny
KEN
  • ADMIN
Glad you could get it fixed, that kind of problem can be tough. Please use 2CarPros anytime we are here to help

Cheers, Ken
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Saturday, July 29th, 2017 AT 8:25 PM

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