So we finally hit 100 degrees here in Coastal Georgia today. Possibly coincidentally, I started getting a nasty vibration in the steering, and the engine light came on. Vibration was at all speeds. Egine code is P0455, Evap Leak Monitor Large Leak Detected. Just drove the car around after letting it cool awhile, and the vibration seems to be better. Thoughts on what either issue might be as it relates to crazy heat and humidity?

 

the p0455 is either a cracked vacum hose on the vap system (most likely by the charcoal canister under the drivers seat) or a bad gas cap, both easy to fix the vibration is odd, have you been off-road lately? (mud caked in one of the rims??) or hit any nasty potholes (slip a belt in a tire) or have anything else leading up to the vibration??

 

No, I haven't done any crazy driving lately, but that's relative I guess. Drove it today, and no vibration. Where it happened yesterday was the same roads I drive everyday, too. Started looking for the vacuum leak, and got as far as deciding that I'm going to rip off that stupid skid plate this weekend.

 

+2 on the evap hoses, if in doubt replace. The ones by the charcoal canister are pretty easy, and a good chance of dryrotting. Another place to check is behind the PCV valve, there is a rubber hose that leads to a plastic tubing that runs behind the engine.