mrjonger

Anyone want to venture a guess? The car sat for a few weeks. I drove it around town, parked for several hours, and then started driving home when I heard the noise as I started pulling away. The frequency of the slap matches the rpms. The suddenness of the onset has me thinking that it's not bore scoring or piston slap - I mean those would get gradually worse over time right?

https://photos.app.goo.gl/a2Z8iWBqErueTHR67

https://photos.app.goo.gl/BsEWfNXzXseCRKn19

Thanks in advance

Horsepwr

They play but without sound?

mrjonger

Is the video on mute by any chance? If you hover over the video, there's a speaker button that pops up towards the bottom.

Horsepwr

Nothing, it just see it playing. It opens up in some weird google form, can you post a different way?

LexVan

Didn't watch video.

How's your serpentine belt?
How's your water pump?

Mike Murphy

mrjonger

Agree Murphy. It's going to the indy tomorrow on a flat bed. If it didn't sound so bad, I'd be trying to fix myself. I just posted in the off chance someone could say it's definitely part x - then I could go about doing something without starting the motor.

Lex - Serpentine belt is less than a year old. Water pump is a little over 2 years old.

pmkazz

Sounds like maybe an exhaust leak...

Ahsai

Since the car has been sitting for a few wks, I would just drive it a few days and see. Just make sure the oil level and preasure level is good. Could be just a clogged lifter. It may unclog itself after some driving.

mrjonger

There's a response I didn't expect. I don't know, I'm hesitant in fear of really screwing something up. If it's stuck lifter, I'd rather pay the indy for an hour and have him tell me that haha.

Ahsai

Sure. Always best to have someone checking it in person.

808Bill

Indy might just do the same thing (which scares me) start it and drive it...I hope he really knows these engines!

rogazilla

Just from reading all of these stories, there is a few thing you can check quickly and try to rule it out. These are just my notes from reading all the knocking, ticking stories over the last 2 years.

1. Isolate noise, see if it comes from the Cat, Exhaust, head, block, water pump, oil pump... If you are afraid of starting the engine at this point which is understandable, skip this step.
2. Drop the oil filter, collapsed filter causes a similar noise. Also a chance to check for metal or other pieces which then point to bigger problem
3. Check spark plugs, loose plugs makes that clicking, knocking noise that goes with revs too. Doesn't get louder but it does go faster/slower.
4. Drop the oil sump

The above 4 seems to be something easy to do and its what I would do in that order. I am think item 2/3 are probable due to it happens very suddenly.

Splitting Atoms

Since you are taking it to your Indy, this may no longer be applicable, but I would drain oil and inspect oil filter. If there are no particulates, you have ruled out most of the costly failures. If no particulates, I would run it and see if I could isolate the noise to a particular location.

mrjonger

Thanks everyone, I'll keep this in mind for next time. Car is on it's way to the indy. We'll see what he says. The indy has a great reputation and was a referral from my old trusted indy in LA (Callas).