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Car Sounds Like A Wrx ... How Do I Stop This?

PSIKO

By PSIKO,
in Engines & Forced Induction

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PSIKO Mentor

PSIKO

Posted
Posted

Hey guys,

Earlier tonight my car (which had been driving absolutely perfectly) all of a sudden started running like absolute crap, and what I can best describe as sounding like a WRX.

I limped the car home (50kms, sigh), and it seemed to only do it once the car had come up to temperature from that point on.

I am not sure whether it is the fuel filter, I haven't really changed it since I swapped to e85, though in saying that I haven't had much of a chance to drive it much

Modifications which would have an impact are:

  • RB26DETT
  • ViPec ECU running MAP
  • Running on e85
  • New spark plugs within the last couple of weeks
  • -5 turbos, full aftermarket exhaust
  • Splitfire coils (probably less than 1,000km's on them)
  • Metal headgasket with ARP headstuds freshly put in within last week or so

I've only just had it put together, and was dyno'd last week and was fine there

A mate noticed when I pulled out of the car park he thought he saw a puff of smoke but couldn't see what colour it was but thought it might be white (with nothing else after that initial small puff), perhaps ethanol perhaps something else?

A niggly problem that I have with the car is the electrics - there's a circuit breaker (180 amps or something large) which seems to sometimes prevent me from starting the car up (this happened tonight too) - could this have an impact, as there's not enough voltage going to coils or anything like that?

If anyone could suggest anything, that would be greatly appreciated.

Of course I'll be contacting the tuner, but just to get some initial ideas in case it's something easy like a fuel filter (which I will also be replacing)

Cheers!

iruvyouskyrine Grand Master

iruvyouskyrine

Posted
Posted

Running on 5 cylinders. Did you wash the car recently? Most common issue is water sitting in around the coilpacks, or your coilpacks could be on the way out.

Leave the car running rough and disconnect each coil pack one at a time until you hear no difference in sound. That's the dud one.

Sinista32 Grand Master

Sinista32

Posted
Posted

Agree with running on 5 Cylinders

Could be anything that's associated with stopping that cylinder from firing or firing at the correct time

process of elimination starting with the method above

PSIKO Mentor

PSIKO

Posted
  • Author
Posted

Cheers for the replies guys,

Yep car has been washed recently - however is it odd that it would suddenly start doing it, and across the full rev range, if it was from water from a recent wash?

Will test the cylinders this weekend as you both suggested

Badgaz - doubt it's intercooler as it's not running MAFs, cheers though

Thanks fellas

Blackkers Experienced

Blackkers

Posted
Posted

I dropped an injector once and it ran on 5 cylinders. Sounded like a wrx too, rough when driving and idling. But on deceleration the engine felt smooth again. So in gear above ~2k rpm with 0% throttle the engine felt smooth. That's how I knew it wasn't an internal engine issue

Maybe give that a go if you're worried. I suspect coilpacks or plugs

iruvyouskyrine Grand Master

iruvyouskyrine

Posted
Posted

You wouldn't believe how many times I have seen this after people was their car. But yeah pulling the clips off the coilpacks and injectors progressively is an easy and almost guaranteed way of fault finding the problem.

Good luck :)

Badgaz Experienced

Badgaz

Posted
Posted

Cheers for the replies guys,

Badgaz - doubt it's intercooler as it's not running MAFs, cheers though

Thanks fellas

So your map sensor, iat sensor and tps are reading correct? Can you data log on your ecu?

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