2007 E63 Stumbling on acceleration when cold - Mercedes-Benz Forum
 
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post #1 of 6 (permalink) Old 01-29-2019, 07:07 PM Thread Starter
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2007 E63 Stumbling on acceleration when cold

2007 E63 Stumbling on acceleration when cold

Just noticed this in the last 3 months.

What is the suggested testing and service?

I am not the original owner and I did not get the service records with the car.

What should I check and replace first?

1.....Fuel Filter

2....Spark Plugs??

3...??

Car has 89k miles.

Love this as a daily driver. 500HP no turbos to worry about.
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post #2 of 6 (permalink) Old 01-30-2019, 01:09 PM
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Add MAF check, EGR valve and tube cleanup(if fitted). Check for any vacuum leaks also, especially the small tubes at the front end of engine; for sec air system, map sensor and intake flaps. Read o2 sensor activity as well.


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post #3 of 6 (permalink) Old 01-30-2019, 01:49 PM Thread Starter
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Thanks noetico. I'll put those on my checklist. Thanks a lot for responding.
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post #4 of 6 (permalink) Old 01-30-2019, 01:58 PM
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Quote:
Originally Posted by sker66 View Post
Thanks noetico. I'll put those on my checklist. Thanks a lot for responding.


No problem... I forgot; err... As a side thingy... You can also give it a blast of seafoam through the intake, you can put the straw through the hose of the secondary air valve actuator. Check YouTube for videos on how to use seafoam. It just cleans things up for you especially as you've had this kind of rough combustion probably for a while.


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post #5 of 6 (permalink) Old 01-30-2019, 04:37 PM Thread Starter
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Cool noetico......I'm adding that to my list. I'll let you know how I make out. Thanks for takeing the time to answer my Thred! This site has been a lifesaver owning older Mercs!
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post #6 of 6 (permalink) Old 04-24-2019, 11:05 PM
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You have a leak unmetered air would be the most common before anything do a throttle reset see if it changes


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