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Old 09-11-2006, 04:47 AM   #1
ccmah
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Default Crackling noise under hard acceleration

Just wondering if any of you may have some thoughts on this.

So I am in California running on Chevron 91 Octane gas (best I can get). Synthetic Oil from my recent 48k service, and the car is a 2004 WRX.

I noticed under hard acceleration, like trying to pass a car when I am already 120km/h (trying to go to 140km/h aggressive), I hear some crackling noises not consistent, but only when I floor the pedal. (4000RPM).

Any thoughts? Is this pinging or something else? I also get it from time to time if I am really taking off on a red light and rev it up high.

Thanks
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Old 09-11-2006, 04:59 AM   #2
RX Renesis
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does it sound like marbles shaking inside a tin can?
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Old 09-11-2006, 05:03 AM   #3
ccmah
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not really...well hard to say. It sounds kind of like a cracked speaker (although my stereo is not on). I mean if the acceleration noise was sound coming from a speaker - you would get some "cracked sound" only when it hits the highest of RPM.

I'm thinking it may be pinging at heavy load - particularly when 91 octane is the best I can get here.

Has anyone tried Octane Booster? Although I heard it's tough on the spark plugs.
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Old 09-11-2006, 11:04 AM   #4
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I think I have the same thing on my 04. I'm thinking it's knock...

Not the full on marbles but something along those lines!
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Old 09-11-2006, 11:30 AM   #5
ccmah
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Quote:
Originally Posted by dsmtowrx View Post
I think I have the same thing on my 04. I'm thinking it's knock...

Not the full on marbles but something along those lines!
Exactly - were you able to fix it or get rid of it?
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Old 09-11-2006, 11:57 AM   #6
jstbstn
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you can't get 94 octane in burnaby??? Have you tried a petro can for 94?
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Old 09-11-2006, 11:59 AM   #7
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Quote:
Originally Posted by jstbstn View Post
you can't get 94 octane in burnaby??? Have you tried a petro can for 94?
He's in Cali right now...as per his post.
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Old 09-11-2006, 04:47 PM   #8
jstbstn
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oops.... my bad.... carry on.
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Old 09-11-2006, 04:48 PM   #9
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Yeah, that's about right.

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You've discovered the joys of California gas. Your ECU will adjust, it will just take some time, and you will probably still have pinging.

You could try water injection to reduce the intake charge temp.
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Old 09-11-2006, 05:44 PM   #10
jlam86
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does it kind of sound like something punching? or is it more of a high pitch?
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Old 09-11-2006, 09:43 PM   #11
ccmah
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no, it's not high pitch, just more of a scratching/crackling noise. I'm almost 100% sure it's knocking/pinging now. Some folks also suggested Octane Booster, but I don't think there's enough booster to raise the Octane in a significant way.

I was also told to buy an accessport to re-flash the ECU mapping.

Anyhow, I may just buy some 100 octane (only one gas station has it here in San Jose - home of import nights...) It's still a hassle nonetheless. It's also quite expensive; nearly a dollar more per gallon.
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Old 09-11-2006, 11:37 PM   #12
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Yeah, that's about right.

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Are you running any mods or just stock? In stock form my early-run '02 WRX pinged mildly on California crapgas ... it would just get worse with any mods.
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Old 09-12-2006, 10:11 PM   #13
ccmah
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nope - it's stock...no mods. I think it's pinging that's the noise. Today I didn't hear anything...except when I really floored it to 120km/h off a merger from 40km/h and it reached over 4500rpms...but it was very mild.
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Old 09-13-2006, 01:35 AM   #14
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Yeah, that's about right.

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Does the manual still say that some light pinging is normal? I thought I remember reading that way back...
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Old 09-13-2006, 05:24 AM   #15
ccmah
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Quote:
Originally Posted by Necromancer View Post
Does the manual still say that some light pinging is normal? I thought I remember reading that way back...
yup it does - some light pinging is normal. I'm thinking about going to 100 octane for a week to see what happens. It's a shame that in California, it's 91, then 100 at the rare locations.....sure could use some Chevron 94.
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Old 09-13-2006, 06:51 AM   #16
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04 WRX's have huge problems in cali. i don't know all the details, something about the way the ECU switches between open loop and closed loop... and the reasons to the best of my knowledge are that because of the STi, the wrx fell into a lower performance class from subaru, so they nerfed the engine to be more efficient.

at least, thats what conjecture + a few hard facts would have me believe

either way, your options are 100 octane if you can find it, or perhaps toulene mixing if you're feeling brave (and cheap). not that toulene is unsafe to run in your engine. its just poisonous. eye protection and gloves time.
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Old 10-10-2006, 01:19 PM   #17
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Quote:
Originally Posted by FunkMasta View Post

either way, your options are 100 octane if you can find it, or perhaps toulene mixing if you're feeling brave (and cheap). not that toulene is unsafe to run in your engine. its just poisonous. eye protection and gloves time.
How much toulene is needed to raise 91 to around 93-94 octane? Also, is it safe (for motor/parts) to just pour it in there?
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Old 10-10-2006, 01:28 PM   #18
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So that's what that sound is....
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