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Ping/rattle from cheap gas...

 
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Old 10 Feb 2013, 07:22 pm
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Default Ping/rattle from cheap gas...

Getting a light rattle when I run 89 octane or lower. I've read that's from a tiny bit of gas getting into the cylinder early. Is that true and is there a way to fix it? Recently replaced the plugs wires and cover gasket.
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Old 10 Feb 2013, 07:57 pm
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Default Re: Ping/rattle from cheap gas...

Run some fuel injector cleaner through it can't hurt. Also might try a different brand of fuel.
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Old 11 Feb 2013, 03:09 am
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Default Re: Ping/rattle from cheap gas...

I believe PT's have a knock sensor.
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Old 11 Feb 2013, 09:43 am
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Default Re: Ping/rattle from cheap gas...

Yes to everything and as usual a new member with little information to help them?
Try..

What PT you have
What country you are in
How many miles on your PT

To start?
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Old 11 Feb 2013, 08:25 pm
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Default Re: Ping/rattle from cheap gas...

If you have a turbo you shouldn't run that low of octane. I agree with Nitro more info is needed.
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Old 13 Feb 2013, 10:12 am
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Default Re: Ping/rattle from cheap gas...

Sorry guys. It's a 03 base. Had a motor swap last year. Car has 190k+, motor has about 70k. I'm in the US, specifically Nashville, Tennessee. I filled it up with 93 octane the other day and haven't had a chance to drive too far yet as I work within 2 miles if my house. I've helped my dad work on older, pre-efi cars and he always used a timing light to make slight adjustments for this kind of thing. I wasn't sure if there was a way to adjust the timing or if it would have to be reprogrammed or something beyond my abilities. Thanks and I apologize for the lack of info earlier.
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Old 13 Feb 2013, 10:53 am
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Default Re: Ping/rattle from cheap gas...

In the old days, this would call for a "highway tuneup". You find an open stretch of road and floor the throttle, and hopefully burn off some of the carbon deposits inside the cylinder that are causing your pre-ignition (ping).
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Old 13 Feb 2013, 11:56 am
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Default Re: Ping/rattle from cheap gas...

Quote:
Originally Posted by cdc3jj View Post
Sorry guys. It's a 03 base. Had a motor swap last year. Car has 190k+, motor has about 70k. I'm in the US, specifically Nashville, Tennessee. I filled it up with 93 octane the other day and haven't had a chance to drive too far yet as I work within 2 miles if my house. I've helped my dad work on older, pre-efi cars and he always used a timing light to make slight adjustments for this kind of thing. I wasn't sure if there was a way to adjust the timing or if it would have to be reprogrammed or something beyond my abilities. Thanks and I apologize for the lack of info earlier.
Can't change the timing, it's computer controlled. but you might want to try some other brand of fuel first. Then if that doesn't fix things, replace the spark plugs and the wires if they're either old or original. If the ends of the plugs are really crusted with carbon, then you'll know that there is a lot of carbon buildup in the cylinders, which WILL cause knocking. 2 reasons. The buildup of carbon raises the compression ratio and the carbon coating in the cylinder head tends to heat up in spots and burn while the engine is running. That essentially acts like a continuously ON spark plug, igniting the fuel prematurely when it's injected. Lastly, the knock sensor might be bad, so try replacing that if all other things fail.
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