When idling intermittent car shaking

[bmninada]

When idling and engine warmed up or cold doesn’t matter: off and on the car shakes. Engine RPM live view is around 750. However the throttle position live view shows intermittent jumps. When that happens the whole car shakes a bit. Happens for couple seconds randomly. In between usually like 2 or 3 minutes between shakes. The duration of shaking also varies. Sometime like a second and sometimes up to 3 to 5 seconds. Very noticeable.

 

[Silly Wabbit]

How many miles? Sticky throttle body valve maybe.

 

[bmninada]

70,000.
CODE: P0171 -finally appeared.

I am suspecting a vacuum leak perhaps? Ran live view using BlueDriver and collected short and long term fuel trim. The app said should be near 0. But if above 15% *which is what I see most of the time for short term* and if pedal is pressed - its dropping.

 

[ruthrj]

Let’s get the easy ones out of the way just as a sanity check. Is the air filter box closed and secured tight and proper? Is the engine oil cap screwed in all of the way? Throwing those out there in case a service technician might have goofed.

 

[bmninada]

@ruthrj YOU ARE AWESOME. The dealership did not put the air filter box clips on and inside there was no air filter. I had just installed a week prior a premium (not value priced) Mazda air filter. Worked like a champ now - no more jerking / shaking when idling. Engine light went away after 5 miles of drive test. Fortunately, I still had my old air filter in my recyclable trash, which BTW is supposed to taken by township tomorrow!!

 

[HyFlyer]

...The dealership did not put the air filter box clips on and inside there was no air filter...

Pffffffft and they wonder why they get the name "stealership".

Can't even do a simple task for their $185/HR shop rates they want to charge. So ridiculous.

Glad you have it sorted and hopefully no damage from driving around with no filter for ______?

 

[bmninada]

A week...approx. 30 odd miles.

 

[ruthrj]

That’s awesome news, I’m so glad it was an easy fix!

 

[badanth]

And they wonder why people don't go to dealerships for service.

 

[GTXT23]

And they wonder why people don't go to dealerships for service.

Award winning post ! ----

Let’s get the easy ones out of the way just as a sanity check. Is the air filter box closed and secured tight and proper? Is the engine oil cap screwed in all of the way? Throwing those out there in case a service technician might have goofed.

 

[DoubleCH]

Good that it's an easy fix. I'd be concerned if dirt got sucked into engine without air filter resulting in possible premature wear of engine internals in the future.