Question about Mercury Cougar

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95 cougar 4.6L has a P0306 code. Comp. on it is good but on cyl. 2 is low. Plugs and wires have been changed. When oil is squirted in cyl. 2, comp. is normal. What am I missing?

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P306 is misfire cllinder 6 plug or coil or wire on number 6 is bad

Posted on Aug 22, 2010


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My scanner is showing 2 codes 303 & 306..i know its for #3  cyl. any advice /next step/is it coils? / plugs? /help

Common Problems That Trigger the P0306

Worn out spark plugs, ignition wires, coil(s), distributor cap and rotor (when applicable)
Incorrect ignition timing
Vacuum leak(s)
Low or weak fuel pressure
Improperly functioning EGR system
Defective Mass Air Flow Sensor
Defective Crankshaft and/or Camshaft Sensor
Defective Throttle Position Sensor
Mechanical engine problems (i.e.—low compression, leaking head gasket(s), or valve problems

I hade the same problem and changed the cranckshaft sensor and that was it. Above I have included the possible reasons for this code if you meant P0306.

Oct 02, 2016 | Cars & Trucks

2 Answers

Changed headgaskets ,new fuel pump, new spark plugs and wires,still white smoke comes out

did you check the head for cracks some times when a car is over heated and you drove it a long way it cracks the head.
you can send it to a auto machine shop that can pressurize the head for this

Mar 06, 2016 | Cars & Trucks

1 Answer

Misfire in 2002 mercury 4.6. tested coil its good. low comp. on # 7. any help

Low compression can come from 3 places. Intake valve, exhaust valve or rings. Squirt some 30 weight oil in the spark plug hole and retest the compression. If it goes up the rings are worn. If not then a valve is leaking.

Aug 28, 2014 | 2002 Mercury Mountaineer

1 Answer

Loosing ump gutless plugs have 140,000 no codes in comp.

I would definitely do a complete tune up. Plugs, wires, oil change, fuel filter and air filter.

Feb 04, 2010 | 1998 Ford F150 Regular Cab

1 Answer


P0301 = Cyl no 1
P0306 = Cyl no 6

If you have changed plugs and leads and confident that they are now ok you need to run a compression check on all the cylinders, I'd emagine they should all be running at approximately 150psi per bore, if 1 & 6 are down it could be the head gasket, timing or piston rings.

Nov 25, 2009 | 2003 Ford Taurus

1 Answer

Flashing Check Engine Light 99 Camry

light flashes when comp. picks up a skip pull code and it will be po300 random miss p0301 p0302 p0303 p0304 all are for that # cyl that has the miss best bet change wires and plugs check for oil on wire to plug end in spark plug hole leaking valve cover gasket or spark plug tubes...

Dec 31, 2008 | 1999 Toyota Camry

2 Answers

1989 Ford Escort 1.9 TBI turns over but won't start. It is getting spark and plenty of gas. Timing belt is tight and did not jump time.

open the oil fill cap look inside (the hole in the valve cover ), is the camshaft turning? if not the cogs are stripped off the timing belt belt
note:i believe this engine is an interfearence engine. meaning when the cogs strip off the belt or it breaks, the valves can and usually do

Dec 11, 2008 | 1998 Ford Escort

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