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Weird Noise When My Car Revs To 5000 Rpm

RBTWENY5

By RBTWENY5,
in Engines & Forced Induction

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RBTWENY5 Community Regular

RBTWENY5

Posted
Posted

ok when im driving and i rev it to 5000 rpm it makes this weird noise its almost like its tapping out but it taps out really fast like brbrbrrbrbrbrbrbrbr lol its never happened before so if u know what it is or could be then please let me know

also when i got my exhaust put on i asked them for a decat pipe so they just welded in a pipe but that sensor that goes into the stock cat yer they didnt put that in should it be in there or doesnt it really matter could this be my problem?

paulr33 Grand Master

paulr33

Posted
Posted

the tapping and brbbrbrbrbr is the engine detonating / misfiring

stop loading the engine up, stop loading it up on boost and find out the cause

likely causes

- boost too high

- crap fuel

- broken vac lines etc

- mangled boost controller

- poor boost control

- unlimited boost

- issues with fuel delivery - too lean, pump dying, rail shagged, injectors shagged

when did it start?

what did you last change?

what ecu? what boost control?

what other mods?

89CAL Grand Master

89CAL

Posted
Posted

so your using a boost controller of some sort?

I thought it might be detonation but its to hard to tell... can u desecribe it any better?

Does it push through the miss or does the miss at 5000 stop the car from reving any further

Just put as much info as you can think of up here and ull get a better answer

even if you think its pointless information just put it up anyway.

GT-RZ Community Regular

GT-RZ

Posted
Posted

sounds like a rev limiter at 5k lol. coils wouldn't be constant enough to literally hold it at 5k. neither would fuel delivery or boost problems.

think you need a better description. if it intermittently cuts out then it could be any of the above but if it drives perfect up to 5 then holds it there....

RBTWENY5 Community Regular

RBTWENY5

Posted
  • Author
Posted

yer it runs fine up until 5000 rpm its like a car tapping out but faster tapping if that makes sense i dont really hold it i mean like as soon as i hear it i back off or just change gears so i dont know if it goes away or stays but i f*kin want it gone bad how can this be solved like can i put the car on a dyno n find the problem or do i have to just keep replacing things until it goes away

RBTWENY5 Community Regular

RBTWENY5

Posted
  • Author
Posted

nah it happens whenever i boot it i mean it just started happening on sunday and i kinda didnt pay to much attention but it happened again today in third gear so i havent actually driven the car to see when it happens cos im to scared that sumthin is gonna f**k up

Wacky Dee Veteran

Wacky Dee

Posted
Posted

you'll only get guesswork here because it can be so many things... sounds like something you should be taking the car to a performance car specialist/mechanic for. Get it on the dyno and let them figure out what the problem is before it becomes worse.

Beer Baron Grand Master

Beer Baron

Posted
Posted

no it's not a 'ping coming from the exhaust'. I'm sorry but there is no such thing.

a hole in the exhaust will not cause an engine to ping, nor will it cause a missfire, nor will it cause the engine to cut at 5,000rpm. all it will do is leak exhaust gas which will make the car sound like it has an exhaust leak.

it's pretty hard to diagnose over the net. take it to a mechanic.

RBTWENY5 Community Regular

RBTWENY5

Posted
  • Author
Posted

yer i took it too boostworx today and they said its probably missfiring so ill get them to get it on the dyno

but today i drove it too see if it would stay at 5000rpm n not move or once it got past 5000rpm it would be fine and it didnt do it at all so i dunno whats going on there

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