2009 Prius Need Help Diagnosing Engine Noise/Vibration

Hi Everyone,

Pria has been running well except I've been noticing a change in sounds. One symptom has been diagnosed as "misfiring". Mechanic suggested getting spark plugs replaced (111,000 miles). During test drive I couldn't reproduce other sound.

Back when I was Prius test driving most had a vibration occur soon after stopping at a light. A vibration caused from switching from electric to engine mode maybe? My final choice only did this now and then. Seems to be occurring more often now. Recently I've turned car on and got out to get something out of back seat and car actually jolted slightly during what sounds like a change from electric to engine mode.

I actually drove almost 1.5 hrs to an independent master hybrid tech because I've lost confidence in local dealership. Need to call him tomorrow to let him know new spark plugs did not take care of other noise.

Any ideas? Someone said this could have something to do with the regenerative breaking or some about relay something or other. Can't remember now. : /

Thanks!

Maria

 

No, I don't think it sounds like that. It sort of reminds me of when a regular car is downshifting. Might not be using proper terminology. : }

Thank you for responding!

 

Thanks for your quick responses!

My big concern is taking good care of expensive components and not getting stranded somewhere. : } I was used to all the hybrid noises and even this "chug and rattle" (perfect description) but it's definitely a bit exagerated. Actually noticed it more after coolant valve and oil temp sensor were replaced but not immediately after. Don't want to revisit that one!

Is the MAF sensor hard to get at? Expensive to clean off. : ) Might have to go back to dealer for my regular oil change/tire rotations because it's most economical. Just had very expensive oil change and tire rotation when getting spark plugs replaced. Kind of feel more comfortable going back to this independent mechanic for sensor but such a drive. He did include examining under body well and did hybrid battery test. Noted cracked plastic engine shield (next repair) but said car looked like it was in really good shape.

 

When you say "these can be cleaned...takes some care" do you mean more than one sensor should be cleaned?

I went to Bob's Motor Workshop in Milford, MA. His testimonials include diagnosing some problems with a salvaged 2009 Prius. Dealership couldn't figure it out. Sounds like he really thinks things through but I was taking a shot in the dark and hoping to find someone closer.

 

Oh...ok. Thanks for clarification. Not something I should mess with. I have chemical sensitivities. So far cabin and engine air filters are the extent of my DIY. : ) I'll call for a quote although really not in the mood to find out cost. : } Thanks!