LexusLadi

Hi,

I recently got the timing belt along with water pump replaced. While they were in there, they changed the spark plugs and intake gaskets. I also had a leak in the radiator so that needed to be replaced. The car has 97K and is a 2008 400h. Local ex-BMW mechanic shop did the work. I supplied all the parts, and he only charged me for labor.

Car runs super smooth now with the replaced plugs and we have been euphoric with the maintenance to date until very recently.

So 1500 or so miles since this major service. My wife and I have been noticing that under load typically on an incline/hill there is some noise coming from the engine. I heard it again the other day and were only noticeable at low speeds between 10-35 MPH and low RPM. (I couldn't tell you exactly the RPM's as its not provided in the instrument cluster.) It seems like the engine is struggling a bit and is rattling at the top near the back of the engine bay/ fire wall area. Maybe its the intake manifold housing? Its hard to reproduce too. Once I give it some gas it goes away. It only seems to happen once on every trip and only on hills/grades at low speed.

Going from being an even quieter and smoother running vehicle after the service to this is making me a little concerned.

Any thoughts?

Thanks a lot in advance.

LexusLadi

Also no check engine light.

I spoke to my mechanic and he said to come by so that we can go for a test drive and try and reproduce it.

Maybe the cars getting old... Maybe bad gas.... IDK

LexusLadi

Update

One dealer thought it might be the Main Bearing
Second dealer thought it might be a loose wiring harness that wasn't put back properly after the initial shop had the entire cowl and wipers off to get to the spark plugs. As I mentioned in the beginning.

I am going back to have the problem addressed by the ones who did the work in the first place.

This whole process has been a huge pain in the ***,

But on the bright side we got a brand RX as a loaner.

thomas1

Did you get the problem solved?