Hi guys,
Today I took my Accord 97 back from the mechanic shop and I noticed pretty strong vibration inside the car. When I drive the car it runs smooth but it is vibrating at idle. Until yesterday the engine was so smooth and quiet that I couldn't even hear when the car was on. I left the car at the shop this morning for oil, transmission fluid,filters, spark plugs, front and side mount changes and I took it back later today with this strong vibration. Does any of you has an idea what the problem could be. I will appreciate your help!

 

Could be a number of things?

What is the idle rpm with the car in D4 (assuming an auto - if manual, you know the drill) sitting still - with the engine at normal op temp?

 

did they put oil back in it?

 

^^^ Oil is good to check, but don't work on it yourself, doing so dilutes the shop's responsibility.

Return it to the repair shop.

 

I'm going to echo what UhOh said...

In most cases, something they did wasn't done quite right.
My guess would be possibly misfireing in the engine, possibly from one of the spark plug wires not being connected all the way, possibly wrong order, maybe they dropped a sparkplug and it's no longer correctly gapped.

In any case, you paid a mechanic money to do this job correctly, I'd take it back and ask them to double check it and find out whats up.

*very important* Remember, we're all humans, we all make mistakes, it happens, you just want to get the job done right.

Professionals(in ANY business) hate when customers come back and tell them they messed up. But if you word like above they should be jumping at making it right, or finding the problem.