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Ron, ASE Certified Technician
Category: Ford
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Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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1997 Mercury Sable: shakes..exhaust..Rev it up a few times..it smooth

Resolved Question:

1997 Mercury Sable-If catalytic converters are bad will this cause the car to start hard. Most time you have to push gas to get it started and once started it shakes and sounds plugged up with strong exhaust smell. Rev it up a few times and it smooth out. no problem driving down road
Submitted: 6 years ago.
Category: Ford
Expert:  Ron replied 6 years ago.

HelloCustomer

When the catalytic converters go bad they can cause a hard start and a noticeable loss of power. Restricted converters will also make the exhaust sound plugged. This can effect the amount vacuum that the engine requires to run properly because of the excessive back pressure in the exhaust system.

Customer: replied 6 years ago.
It seems to have all the power while driving. I did check the plugs and 3 were dark and 3 were much lighter color. Is this normal?
Expert:  Ron replied 6 years ago.
No they should all be light in color, the dark would indacate a rich condiation. Is the check engine light coming on?
Expert:  Ron replied 6 years ago.
A simple test you can do to determine if it is in fact plugged converters is to loosen the exhaust on both banks. If it runs right then its likely restricted cats.
Customer: replied 6 years ago.
this is the code when it comes on

P0430
catalyst efficiency below threshold bank 2
Expert:  Ron replied 6 years ago.
Yes this would indacate a restricted cat, Are the dark colored plugs on bank 2?
Customer: replied 6 years ago.
2 in back and one in front but they are all on the corners
Expert:  Ron replied 6 years ago.
Well like I said, loosen the exhaust pipes where they hook on to the manifolds and if there restricted , you should notice it run much better.
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 27604
Experience: 23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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Ron
Ron
Automotive Tech
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23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs