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Old 10-08-2012, 01:44 PM   #1 (permalink)
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Default chain noise going uphill

When driving my '11 5MT, naturally aspirated Fozzie uphill, I sometimes get noise like a rattling chain. I can prevent this by shifting at higher revs, 3000 - 3500, but I feel guilty pushing it so hard. Is this normal behavior? Thanks!
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Old 10-08-2012, 01:48 PM   #2 (permalink)
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Sounds like you are lugging the engine. Revving the engine up is much healthier for it than what you are doing now, revv it up and don't worry about it.

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Old 10-08-2012, 04:20 PM   #3 (permalink)
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Maybe a bad knock sensor? Would that cause a CEL?
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Old 10-08-2012, 04:25 PM   #4 (permalink)
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Again, I agree with Stan. Probably lugging the engine, which causes a "rattling" noise almost. That's very bad for the engine. Driving with it uphill at 3500 RPM is fine. Drive the car throughout the RPM range, it's healthy for it.
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Old 10-08-2012, 05:32 PM   #5 (permalink)
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Ok, thanks. But what is that sound? Is that the timing chain? Also, what does CEL stand for? Thanks again.
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Old 10-08-2012, 06:13 PM   #6 (permalink)
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Not lugging - it is pinging. Manufactures are pushing the timing to a very fine line in the name of emissions and economy.

From page 7-2 of the owners manual:

! Fuel octane rating
This octane rating is the average of the
Research Octane and Motor Octane
numbers and is commonly referred to as
the Anti Knock Index (AKI).
Using a gasoline with a lower octane
rating can cause persistent and heavy
knocking, which can damage the engine.
Do not be concerned if your vehicle
sometimes knocks lightly when you drive
up a hill or when you accelerate. Contact
your SUBARU dealer if you use a fuel with
the specified octane rating and your
vehicle knocks heavily or persistently.
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Old 10-09-2012, 07:58 AM   #7 (permalink)
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Very informative. I wonder if changing to a mid grade gas would help. I understand Subaru recommends 87 octane gas. Would it harm things to try the next higher grade. I am in California, where they use a special formulation for lower emissions. I wonder if that is a factor. I don't think you can consider an engine lugging that is going at 2700 rpm.
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Old 10-09-2012, 08:30 AM   #8 (permalink)
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CEL = "Check Engine" Light

This light is activated whenever one of the various sensors throughout the vehicle experiences a 'fault' condition and sends a code to the Engine Management system. The code can help pinpoint the problem condition as each code has a specific definition. The mechanic who services your car can use the code to troubleshoot the problem and repair it.
If the light comes on, it isn't necessarily a catastrophic situation, but should be checked out by a knowledgeable repair person.
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Old 10-09-2012, 07:37 PM   #9 (permalink)
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Quote:
Originally Posted by Rwinner View Post
Very informative. I wonder if changing to a mid grade gas would help.
I am also in California (lucky us and the current fuel prices) and I also get the pinging while going uphill around the 2,500 - 2,700 rpm- push harder to 3,000 rpm and it stops.

Just a FYI there is no such thing as "Mid-Grade" fuel- what is really going on is the pump is mixing regular and premium together to get the "Mid-Grade". I have thought about trying a tank of premium, but the pinging is so mild and only happens on a brief part of my climb home that I just ignore it.
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