Q: 99 mercury sable 3.0 ohv is skipping. Change my spark plugs and wires plus the ing Coil. It is still misfiring in cylinder

asked by on

My service engine soon light is flashing on and off. Misfiring in cylinder 3 and 4 plugs wires and coil has been replace still misfiring in the same two cylinders

My car has 116000 miles.
My car has an automatic transmission.

You should check for fuel injector pulse at the injector with noid light connected to the injector connector. Retest system after clearing the codes to make sure the codes return for misfires on cylinders 3 and 4. The spark plug cables should be verified they are connected to the coil correctly or the #3 and #4 wires are crossed on the coil. If they were on wrong then clear codes and retest the system for clear codes and no misfires.

Was this answer helpful?

Hi there. If the coil, plugs, and wires have been changed then it sounds like there may be a mechanical concern. Do the same codes return? Same cylinders? Does the exhaust have a strong fuel smell? Broken/severely leaking injectors could be dumping fuel into the cylinder. Check the oil and smell for fuel as some of the fuel will enter the crankcase. If this is not a fuel injector concern, then it will need appropriate mechanical testing to determine if the compression is within spec, if there is cylinder leakage, and determine the best course of action. I suggest having a qualified technician perform an inspection to avoid replacing unnecessary parts. Your Mechanic has several available technicians that can assist you with a misfire inspection.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. 99 mercury sable 3.0 ohv is skipping. Change my spark plugs and wires plus the ing Coil. It is still misfiring in cylinder

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: My car want start when cold Without acceleration

On a car of this age, make sure all engine maintenance (plugs, wires, filters) is up to date and change the fuel filter. If the difficulty still persists, a hard starting diagnostic, performed by YourMechanic, would identify the issue. Possible...

Q: Non stop jerking when gas pedal is pressed to floor

Hey there, thanks for writing in about your 1999 Ford Escort. You may have to have the vehicle checked for misfires. You could have a bad coil pack putting out weak spark or the fuel pressure is low. It would...

Q: My neighbor has a 2002 mercury sable and he press the pedal and it revved up but didn't move

It could be that the transmission has failed. Or it could be that there is a bad CV joint. either one will leave you stranded in place. If he has heard some knocking when he went around turns for a...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.