Raptor2k

I got back from the dealer to check on the engine rattle that I'm getting at 7500 rpm, and I had a technician ride with me to hear the sound, and they spent a day performing tests (they werent specific, but not compression tests). After all that they said it's normal for the engine. How is it normal if I'm one of the few getting the noise?

On the receipt:

"Test drove the vehicle and verify the noise. Ck the engine and verify the noise is coming from the engine. Test drive two other vehicles and verify this is a normal operation noise. Spoke with tech line and verify the noise is normal for operating at that RPM."


So...I guess I live with the metallic rattle?

tiggerlee

So did you actually see them test drive two other 8's to verify they had the noise also? Or just read it on the receipt?

Cattywampus

I smell a big *** grill full of bull$h!t. I used to work for a dealership when I was 19. That looks like the typical bs they always did to their customers.

Skythe

if i heard a rattle at 7500 rpm i'd be bout ready to **** myself, and whenever it comes time to have shatted, that means something is very wrong.

NEVER, ignore that feeling.

Raptor2k

They also told me in person also. But obviously, it's not a rattle on most rx8s. I wonder if they found out the cause of missinmyseven's rattle.

missinmahseven

^ SA didn't even *hear* it. Deaf as Beethoven, that man must be. Or he never made the big red needle sweep past the big 6 on the dial.

Skythe

I have no rattle, therefore, I have deduced that it is not normal.

Raptor2k

pinging, and yes, I use 93 and it's been there for a while

otherside

Take it easy on the dealers, we are not all bad. Ask to go for a road test in another RX8 with the technician or service manager. That way you will know if it is operating as designed.

zoom44

you dont think its the VDI opening at 7250 as part of the normal S-DAIS function?

stickman

Interesting, I get some light, rattle-like noises when the car is not fully warmed up at low rpm, barely there type sound that goes away as engine warms up. I attribute it to various solenoids operating as it gets to operating temperature. No rattle sounds at high rpm.

Raptor2k

S-wha...?

Raptor2k

It's not on other rx8s. So it's obvious it's not normal, but they say it's normal. I shouldn't have to prove it's not normal by driving around in other rx8s.

missinmahseven

Imagine a rod, say 1mm in diamater, hooked up to a metal piece, which in turn moves a valve, kinda like a throttle linkage, but much smaller.

Imagine the renesis at about 6500 or so rpm (somehwere around there) making a particular frequency which rattles this theoretical piece. That's what it sounds like to me. Like it is being buzzed at one very narrow range of frequency. It's light metal against light metal. Soon I'll go hunting for it myself.

jaguargod

It sucks, but you have to perform due diligence to determine if the rattle is normal (you can't depend on the dealership to do it). If that means riding with a technician to verify the sound in other RX8's, then that is what you have to do. Get it fixed, and then file a complaint with Mazda.

RoXanneBlack8

i have the same issue.

when the first time i spun it to 9k it clciked so bad it was louder than the engine. over 7300 rpm the cars power would go flat and pull at a constantly slo rate, slower than normal! each time i take it over 7300 rpm it gets better and better, but im not happy anyway. pre production rx8s had this issue too and its still not resolved. the SDAIS system is quirky and complicated so they occasionally fail. whats weird is how its on only a few of them.

its at exactly 7300 rpm when the VDI opens up. fyi the apv opens at 6250. its an insanely fast clicking sound. no this sound isnt normal, they just dont kno how to fix it. WE replace the lower intake manifold plenum, that is where the vacuum solenoids and motors are positioned for the SDAIS system. it involves dropping down the engine and removing the intake manifold and replacing it. super labor intensive but its warranty so its free!

Raptor2k

Who's we? How do I replace whatever you're talking about?

Raptor2k

lol, it looks like they also replaced the spark plugs and battery, it starts up instantly

I also didn't have my engine cover on when I gave them the car, and when I came back home to add oil, they put on another engine cover, lol. It looks used, they must of misplaced it...

Raptor2k

*ponders meaning of life*

zoom44

Sequential Dynamic Air Intake System

https://www.rx8club.com/showthread.p...ghlight=S-dais

zoom44

a couple pre-production cars had an issue with the APV and/or VDI not opening(at a media day no less )- this wont cuase a clicking or rattling sound. the sound you guys are describing sounds more like ping. why would it be weird for only a few cars to have an issue? that would be normal as a couple of parts in a couple of thousand are out of spec and fail



that is the only correct way to fix VDI issues on a customer's car- replace the lower manifold

Raptor2k

Where is the lower manifold located? Should I try to ask my dealership to replace it?

zoom44

try this- ask them "if its normal then can you explain to me what causes the noise?"

seymore15074

Likewise.

RoXanneBlack8

im gonna go ahead and agree with zoom44. its gotta be a ping. i switvched gas brands a few weeks ago and it hasnt returned. i USED to use sunoco 94, then 93, now i use shell 93. perhaps the computer didnt advance the timing enuff when i was wailing on it? perhaps that 94 wasnt REALLY 94? same goes for their 93????

sat morning im running a compression test, this sucker cranks long in the morning recently and im sweatin it bad. ps i have an 06 with 3800 miles