What can be causing the vibrations??

Asked by Meanazbiz Oct 20, 2020 at 06:01 PM about the 2004 Chevrolet Classic FWD

Question type: Maintenance & Repair

I have a 04 Chevy Classic 2.2L. Mileage about 158000. The
car has been a little stressful. The car drives fine it speeds
up and brakes just fine, it only vibrates pretty bad when I'm
in drive at a stop light and also when I'm reversing. I took it
to chevy dealership and they fixed on if the o2 sensors.
They said the engine looked fine, just recommended me to
get spark plugs for the vibrating. The check engine light
was off for one day. I got the spark plugs replaced. But the
poor idling didn't stop. I took it back to chevy and they fixed
a wire and the check engine light came off for 3 days but
came back. I read about it might being dirty air filter or fuel
injectors or even the gas cap. Changed the air filter and gas
cap but no luck. I used some fuel injector cleaner
(seafoam) in the gas tank then some gas but started
hearing a new noise when accelerating that wasn't
happening before. I took it to AutoZone to see if i got any
codes. And i got a PO455 code that indicated it was a large
leak in the evap system. I took it back to chevy but they
want me to pay another diagnosis to check out the
problem. I don't want to keep wasting money. Anyone can
help by telling me what i need to do to find the culprit
myself.

40,170

TDolby answered 3 years ago

A P0455 is a large leak in the EVAP system. Unless you know what you are looking at, do not take it back the chevy dealer. Find a decent mechanic in your area, they will be able to fix it correctly the same day.

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