Cadillac STS shaking when idling and weird smell
My Cadi has been shaking since the 4th, I first noticed it after school on Wednesday. I had filled up my tank about half way at a new gas station that i had never been to before (i always use 91 or 93). It feels a bit shaky when it first starts up but is the worst when idling at a stop sign or after pulling into a parking spot. If is runs for a few minutes or goes a mile or so it starts to smell like something is burning, but the smell seems to come from the back of the vehicle rather than the engine bay…. I will be taking it in asap but just wondered if any hooligans might know what issue im looking at. The check engine light did turn on after a while.
- 3 Replies
If it smells kinda like a fart or sulfur it may be the catalytic converter plugged up. Normally it would fault one of your o2 censors for wrong fuel mixture. 🤷 Any loss of power?
Possible misfire in the spark plugs and/or what TomTom said.
More I thought about it, it’s more then likely a intake seal or something that is warming up and sealing itself. Maybe a worn sparkplug or plug wire going bad. A clogged cat gets worse when it’s heated up normally 🤦😄 should have thought of that. Could also be as simple as the mass airflow censor on your air intake might loose or dirty. Advance auto or auto zone will be able to tell you the codes it is showing for free and would help narrow it down. Hope this helps
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