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2001 E55 Detonation

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Old Jul 1, 2006 | 05:25 AM
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2003 E55
2001 E55 Detonation
I have noticed that my 2001 E55 under light throttle between 2000-3000rpm has some slight detonation. I was wondering if anyone else has noticed this and what could be causing it? It is bone stock and I have tried different kinds of premium fuel to see if it makes any difference.

Thanks in advance,
Steve
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Old Jul 1, 2006 | 02:07 PM
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From: Lone Star State
w210 E55
Originally Posted by Steve 90TTZ
I have noticed that my 2001 E55 under light throttle between 2000-3000rpm has some slight detonation. I was wondering if anyone else has noticed this and what could be causing it? It is bone stock and I have tried different kinds of premium fuel to see if it makes any difference.

Thanks in advance,
Steve
Funny you mention that.I just noticed a tapping/knocking noise at low speeds on acceleration....you can't hear it outside the car, just the passengers. I'm changing the plugs to IK16 and Magnacore wires....I will keep you posted if there is any changes.
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Old Jul 8, 2006 | 11:48 AM
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From: Lone Star State
w210 E55
Originally Posted by Steve 90TTZ
I have noticed that my 2001 E55 under light throttle between 2000-3000rpm has some slight detonation. I was wondering if anyone else has noticed this and what could be causing it? It is bone stock and I have tried different kinds of premium fuel to see if it makes any difference.

Thanks in advance,
Steve
It's gone man. IK16 plugs, magnecore wires took care of it. Did I mention it is faster also?
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Old Jul 20, 2006 | 01:32 AM
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2003 E55
Replaced plugs with OEM Bosch plugs and noise still persists. Any ideas? The wires seemed to be fine.

Steve
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Old Jul 20, 2006 | 02:06 AM
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Originally Posted by Steve 90TTZ
Replaced plugs with OEM Bosch plugs and noise still persists. Any ideas? The wires seemed to be fine.

Steve
I'd try the wires next. If that doesn't solve it, it might be the coil packs. The wires are a cheap(er) fix, the coil packs...not cheap.
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Old Jul 20, 2006 | 02:15 AM
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Originally Posted by Steve 90TTZ
Replaced plugs with OEM Bosch plugs and noise still persists. Any ideas? The wires seemed to be fine.

Steve
You might be getting some carbon build-up. When was the last time you did some WOT blasts?
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Old Jul 20, 2006 | 02:19 AM
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2003 E55
It is hard to not do wot. I was on the highway last night and gave it a good run a couple times. I am a bit nervous of breaking something though.

Steve
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Old Jul 20, 2006 | 10:54 AM
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Detonation primarily occurs at lower RPMs when the engine is under a load (eg, cruising at 40 mph in fifth gear and then accelerating w/o the transmission kicking down). Try driving the car in manual mode in a lower gear where you can keep the RPMs above 3000 for a sustained period of time. If there's carbon building up in the combustion chamber, this will help blow it out.
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Old Jul 26, 2006 | 10:58 PM
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Did you figure it out?
I was wondering if you replaced the wires on your car after the plugs didnt cure the detonation? I Just looked up the price of the coil packs just for fun, and realized that they really arent very fun on the ole' wallet! My car is idleing funny and seems to have a lot of hesitation from a stop now that it is getting warm in NY.
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Old Aug 21, 2006 | 03:11 AM
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2003 E55
Problem Fixed!!!
Thanks for all your responses. I had my car in for a service and they discovered a collapsed motor mount. The noise in gone now.

Thanks again,
Steve
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