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Old 09-08-2016, 10:29 PM   #1
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2010 hard to start

I have a 2010 550s efi. It recently became hard to start the first time you try to start it each day. It will turn over but won't fire, sometimes if you turn the key off and back on a it will start. Dealer tried to fix it but didn't work. Does anyone have any idea?
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Old 09-08-2016, 10:48 PM   #2
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Start with a new plug and a good battery.
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Old 09-09-2016, 09:04 AM   #3
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I have found if you turn the key and wait a few seconds for the fuel pump to build pressure before hitting start if will fire up soon-er and not die.

And I'll second doorfx on the plug and strong battery.
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Old 09-09-2016, 09:18 AM   #4
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 Quote: Originally Posted by FirecatV2 View Post
I have found if you turn the key and wait a few seconds for the fuel pump to build pressure before hitting start if will fire up soon-er and not die.

And I'll second doorfx on the plug and strong battery.
Exactly! I do the same thing with my EFI sleds. Run injector cleaner once in a while too. I use Seafoam.
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