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  #1  
Old 06-22-2001, 11:59 PM
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1987 300E, w/ 209k miles. When it's hot and I'm accelerating away from a stop, there's a rattling/pinging sound coming from the right passenger footwell. (well, that's where it sounds like it's coming from) Did these engines have anti-knock sensors, or is what I'm hearing engine knock?

anthony
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  #2  
Old 06-23-2001, 09:46 AM
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Only the multi-valve engines have KNOCK sensors that allow the ignition system to retard timing. Sounds like you engine needs higher octane fuel!!
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  #3  
Old 06-23-2001, 10:20 AM
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The 300e also creats lots of carbon from the oil getting by the valve guide seals. This carbon can change the effective compression ratio and increase the octane rating necessary. A good decarbonizing treatment often can solve this if you are using an appropriate fuel.
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  #4  
Old 06-23-2001, 10:59 PM
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Thanks for the information. I'm using 92 octane Chevron gas, so it's not the octane rating. Any recommendations on a decarbonizing agent? Also, does running the engine at high rpm's help in clearing out the deposits?

thanks,
anthony
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  #5  
Old 06-24-2001, 05:39 AM
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Hi Anthony:

I am having the same symptoms as you are with my 87 260E. I have tried retarding the timing, different premium fuels (Shell, Chevron, Arco and Union 76), octane boosters and still can't get rid of my noise.

It doesn't seem like I have any power loss either. It is just a annoying sound while driving.

If I solve my problem or you solve yours, please let me know and I will do the same.

Aloha,
Eric
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1987 260E Forest Green 120,000 Miles
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  #6  
Old 06-27-2001, 12:02 AM
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Hi Anthony:

Check my post.

Knocking Solved. What was that Sound???

Aloha,
Eric
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