('09-'13) chain noise going uphill - Subaru Forester Owners Forum
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post #1 of 9 (permalink) Old 10-08-2012, 02:44 PM Thread Starter
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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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post #2 of 9 (permalink) Old 10-08-2012, 02:48 PM
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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.

Stan

Shocks > struts.
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post #3 of 9 (permalink) Old 10-08-2012, 05:20 PM
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Maybe a bad knock sensor? Would that cause a CEL?
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post #4 of 9 (permalink) Old 10-08-2012, 05:25 PM
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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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post #5 of 9 (permalink) Old 10-08-2012, 06:32 PM Thread Starter
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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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post #6 of 9 (permalink) Old 10-08-2012, 07:13 PM
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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.

I bike therefore I am
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post #7 of 9 (permalink) Old 10-09-2012, 08:58 AM Thread Starter
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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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post #8 of 9 (permalink) Old 10-09-2012, 09:30 AM
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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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post #9 of 9 (permalink) Old 10-09-2012, 08:37 PM
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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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