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2010 Mercury Other engine shaking for some time

Tiny
ABUIBRAHIM
  • MEMBER
  • 2010 MERCURY
  • 4.6L
  • V8
  • RWD
  • AUTOMATIC
  • 113,000 MILES
I have mercury grand marquise 4.6L 2010, the car start flashing the check engine for some time with some shaking in the engine and if I go to the back side there a sound with this shaking like BF BF BF BF, the car looks like sucking the air from the exhaust and push in same time fast in idle while the car stop only,
this issue goes and back to normal if I let the fuel level in the middle 1/2 but if I refill a full tank its back again, I want to know what is the causes for this issue?
I changed the sparks and some coils and I clean and check fuel injectors and I changed also the fuel filter
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Wednesday, December 16th, 2015 AT 9:39 AM

9 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Scan for codes and check fuel pressure with a gauge auto parts rent it.
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Wednesday, December 16th, 2015 AT 10:43 AM
Tiny
ABUIBRAHIM
  • MEMBER
  • 13 POSTS
I checked the code and its says coil7 I change it and no change shows up in the engine, about fuel pressure I dont know whats the way to do that iwill ask about it
thanks
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Wednesday, December 16th, 2015 AT 10:49 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check compression and have coolant system pressure checked for a blown head gasket.
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Wednesday, December 16th, 2015 AT 10:51 AM
Tiny
ABUIBRAHIM
  • MEMBER
  • 13 POSTS
I checked the compression its shows 90 psi about coolant system I did not change the coolent fluid since 5 years
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Wednesday, December 16th, 2015 AT 10:54 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Compression is to low so it's either a blown head gasket or a valve problem most likely. It should not be lower than 20% of other cylinders.
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Wednesday, December 16th, 2015 AT 12:31 PM
Tiny
ABUIBRAHIM
  • MEMBER
  • 13 POSTS
I will do wash and remove sludge from engine might be help, thanks for your help
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Wednesday, December 16th, 2015 AT 5:27 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
That won't help if compression is low.
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Thursday, December 17th, 2015 AT 5:22 AM
Tiny
ABUIBRAHIM
  • MEMBER
  • 13 POSTS
So what I should do if the compression is low?

Do you think if the fuel system semi-plug some where is will cause the low compression?
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Thursday, December 17th, 2015 AT 5:26 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Have it properly diagnosed to see if compression is low it may be a burnt valve or head gasket problem. Fuel pressure has nothing to do with compression. I have no further comments or suggestions.
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Thursday, December 17th, 2015 AT 6:07 AM

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