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rpmdiag, Tech and Instructor
Category: Mercury
Satisfied Customers: 7892
Experience:  Since 1975
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97 cougar 3.8L 6 cyl xr7 'check engine soon' light flashing

Customer Question

97 cougar 3.8L 6 cyl xr7
'check engine soon' light flashing and loss of accelleration only 25-30 mph
shut down engine and restart runs ok
replaced plugs, coil pack, fuel filter and had a fuel induction service
Submitted: 1 year ago.
Category: Mercury
Expert:  rpmdiag replied 1 year ago.

Hi, welcome to Just Answer. I’m Ron and I’ll be helping you
Before we get started though, Please understand that I don't know
your skill level or tools you have to assist us. Also understand that
I can't see, smell, hear, or touch the vehicle either, so patience is
appreciated. JA is a great Q/A site, but it does NOT replace a
repair shop.
My goal is to make you happy and get a great rating in return for
my time. Sometimes I have to give you bad news that I know you
didn’t want to hear, so please don’t shoot the messenger.

Okay, we need to check to see what the codes are that are being stored in the computer. Most car parts stores will check this for you for free with their code reader. A better idea is to have the computer scanned with a scan tool that gives us the codes and the data we need to help diagnose the issue. Most commonly though the CRANK sensor needs to be looked at for this problem.

Thanks, Ron