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Go Back   CleanMPG Forums » Hybrid Owners Community » 2004 - 2009 Toyota Prius II Hatch


2004 - 2009 Toyota Prius II Hatch Everything and anything relating to the Second Generation Toyota Prius Hatch.

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Pinging

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Old 07-19-2012, 07:05 PM
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Pinging

For two months I thought that I had a loose heat shield or some kind of valve problem. Every time I revved much above 2500rpm the car produced a metallic clatter. Eventually it dawned on me that it might be pinging (which would be a first for me in any car) so I put about 4 gallons of premium fuel in when it got down to half tank. Amazingly enough, the clatter is nearly gone under load. Fuel economy is up around 5% over last week, too.

What do we think? Carbon buildup? The car does have 91,000mi on it, and it probably doesn't see engine speeds above 3500rpm more than once every couple of months. Anybody have a favorite fuel additive to recommend to clean things up? Sadly, an "Italian tune-up" is impossible with a CVT without getting arrested.
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Old 07-19-2012, 07:23 PM
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Re: Pinging

Plugs?..Carbon buildup?.. I like using marvel mystery oil, seafoam is also popular but I have never tried it. Works the same way I understand, in an easier-to-apply self foaming action.
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Old 07-19-2012, 09:28 PM
Ophbalance Ophbalance is offline
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Re: Pinging

Not sure that it matters, but isn't it coming up on a plug change as well?
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Old 07-19-2012, 09:36 PM
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Re: Pinging

Plugs are due at 100k, but I could swap them a little early.
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Old 07-20-2012, 06:27 AM
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Re: Pinging

Plugs first then.. inspect them for carbon build up, some ethanol/methanol in the fuel will also help clean out the carbon slowly, mix-in 10-20% E85 if you can find it in your area.
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Old 07-20-2012, 05:40 PM
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Re: Pinging

Plugs are easy so I swapped them out. Advanced had the NGK IFR5T11 (latest OEM replacement iridium) for a reasonable enough price.

The old ones have a bit of carbon buildup but they don't look too bad for 91,000mi.





It's interesting that #1 (far left) and #4 (far right) have visibly more junk on the ceramic than #2 and #3. It must be a temperature or a mixture thing, those being the outside cylinders. They might run a touch cooler, and/or they might get just the slightest bit less air from the manifold.
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Old 07-20-2012, 07:36 PM
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Re: Pinging

I'm on my phone at the moment, Are the center electrodes still flat or are they rounded?
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Old 07-20-2012, 08:29 PM
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Re: Pinging

The electrodes are table-top flat. I just looked under 15x mag.
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Old 07-20-2012, 09:16 PM
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Re: Pinging

How much time did it take to pull the plugs? I'll be doing this in about 7k miles myself (about 2-3 months given the current commute).
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Old 07-20-2012, 09:21 PM
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Re: Pinging

Doesn't look they were a problem. Do you use the same brand of gas all the time? Try some BP or Shell.
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