Question about 2000 Mercury Cougar

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2000 mercury cougar is hestating when you step on the gas. Ichanged spark plugs wires and coil pack also changed fuel filter. check engine light is on and reads po300 multiple misfire.

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  • kickercomp20 Sep 21, 2009

    Fuel pressure is perfect I hooked a guage to it

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A multiple misfire code can relate to a fuel problem check filter pump pressure let me know alan wrench

Posted on Sep 13, 2009

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Related Questions:

1 Answer

2000 mercury cougar will not start


If it is getting spark I will assume the timing belt is working.
You say the fuel pump is good, so what is the fuel pressure at the rail ?
Are the spark plugs wet or dry ? Can you get it to try to start by using starting fluid ?
You may have to get someone to check the computer for trouble codes which requires a scanner or code reader.

Apr 06, 2013 | 2000 Mercury Cougar

1 Answer

Engine misfires at cruise speed 54-55 mph


Okay,it could be a lot of things.......SPARK PLUGS and wiring,coil packs, egr valve erratic and changing positions, vacuum leak.
Dirty fuel filter or gas cap not venting can cause problems.But those are rare. don-ohio (:^)

Nov 08, 2011 | 2000 Mercury Grand Marquis

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Engine turns over but won't start. plugs and wires changed


A diagnostic check of the vehicle will pinpoint your no starting problem,but if that isn't an option for you and you want to do the work yourself, follow these step's:
Check for spark WHILE TRYING TO CRANK THE ENGINE. If no spark is present,check to see if there is power coming from the switch during cranking. If you have spark,check to see if you are getting fuel. If you aren't getting fuel,check your fuel filter(it coud be clogged) and check ALL fuse's. If you aren't getting spark AND fuel,then check the crank sensor as it is the controller for spark and fuel delivery.

Mar 28, 2011 | 2000 Mercury Cougar

1 Answer

Have misfires on firebird hestation and acting


could be fuel pressur regulator or coils

Apr 12, 2010 | 1994 Pontiac Firebird

1 Answer

1999 Mercury Cougar 2.5 V6, had a cracked head and/or blown headgasket. Had the motor replaced now it is skipping on one cylinder.


pull the leads one at a time from the coil pack. if you pull a spark plug wire and the engine rpm doesn't change and there is a weak or no spark the coil pack is likely the problem.

Oct 05, 2009 | 1999 Mercury Cougar

3 Answers

2000 mercury cougar hesitating/jerking


I had the same kind of problem and I ended up solving it by actually checking for recalls for the 2000 Cougar and when you do, you'll see that there is a fuel pump recall. I dont' know if you've already done this but I figured i'd post this and try and help out!

Much luck

Aug 10, 2009 | 2000 Mercury Cougar

1 Answer

2000 mercury cougar hesitating/jerking


First, disconnect neg battery cable 10 minutes and reattach to clear codes.
Lean condition means it is not getting same fuel as other side of engine.
Since you had it scanned before, try Autozone to see if new results.
You might try a TPS switch which regulates spark and fuel feed. At lower speeds EGR starts to open-you should have code for a problem there.

Aug 10, 2009 | 1990 Mercury Cougar

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