Question about 2001 Mercury Grand Marquis

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2001 4.6L mercury engine misfire. Plugs and boots have been replaced, but still have problem. What are possible causes. Engine has 70,000 miles.

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  • Bruce Hathcock May 11, 2010

    Does it have the throttle body injection or individual fuel injection? If it has injectors for each cylinder then you may have a defective injector. I would like to know if it does it all the time or on deceleration or when under power, have you done a top engine clean? A top engine clean may sound silly but will remove carbon build up and stop pre ignition from high compression making it seem to miss, it will also not allow the knock sensor to adjust the timing to keep it from pinging. So with more information I could help you find the cause.

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YOU COULD HAVE A BAD INJECTOR , OR A BAD ENGINE POSITION SENSOR. IT COULD ALSO BE OUT OF TIME .

Posted on Sep 08, 2009

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Causes cylinder misfire


Could be injector or possibly intake gasket leak.
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2009 HYundia, Accent with engine light on and runs rough, with less power


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http://www.rockauto.com/en/catalog/hyundai,2009,accent,1.6l+l4,1443451,exhaust+&+emission

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1 Answer

Engine Code 301


Code # 301??? That is NOT a valid Diagnostic Test Code (DTC) for the engine control system on a 2000 Mercury Sable.

Assuming that you mean P0301, that is a cylinder misfire code that is identifying number 3 cylinder as the cylinder with the misfire problem. MANY things can cause a cylinder to misfire including spark plugs, spark plug wires or boots, burnt valves, broken valve springs, blow head gaskets, cracked cylinder heads, bad or dirty injectors, faulty injector control circuits, Failed ignition coils...the list goes on....proper diagnosis required.

May 30, 2012 | 2000 Mercury Sable

1 Answer

Hi. I have 1997 mountaineer. The cam shaft and sensor was changed. The check engine light is back on and flashing. The engine idling rough. What could be problem?


THE ENGINE LIGHT FLASHING MAY INDICATE A ENGINE MISFIRE OR RANDOM MISFIRE
Possible causes are plugs/plug wires and or fuel injectors

Mar 31, 2011 | Mercury Mountaineer Cars & Trucks

1 Answer

From a stop, when you start to accelerate, the car skip like the transmission is out of sync. Once it starts going it shifts fine. This only happens after the car has warmed up (5-6miles of driving).


Spark Plugs--every 70,000 miles
O2 Sensors -front 2 every 100,000 miles
Clean MAF Sensor
Check coils for misfires
Trans & power steering --Fluid every 30,000 miles

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2 Answers

I have a 2002 Chevy Tracker. Lately it's developed a serious miss, almost as if you turn the key off while it's running. Almost immediately it catches back up again. I don't get backfiring. I'm trying...


Maybe its time for new spark plug,,, this is an inexpensive refresh and something the mechanic will do if he starts troubleshooting the engine miss. While you are installing the new spark plugs, give your spark plug wires a CLOSE VISUAL inspection for burns, cracks, or other defects that would cause a misfire..Once you have replaced the spark plugs..checked the wires, ..and if the miss is still there, its time for a qualified professional to look at it.. they will hook it to a diagnostic machine and tell you what happening... good luck..... and no, it hasn't "slipped timing"..

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2 Answers

I have a 2002 f-150 4x4 lariat. The computer says number four cylinder misfire, I need to know where the number four cylinder is located


1-2-3-4 Pass Side

5-6-7-8- Driver Side

1&5 at front of engine

COP Coil is about $60.00 at
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That only will work, if you got
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PO cylinder codes

Spark Plugs--replace every 70,000 miles
O2 Sensors--replace front 2 at 100,000 miles
Clean MAF and Throttle Plate

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2 Answers

My 2002 Nissan Altima 2.5 engine has a trouble code P 0302 engine misfire cylinder 2 misfire. Whay could possibly be the cause of this.


possible causes are: faulty spark plug, coil not firing or arcing, injector fouled. start with your spark plugs and if replacement is neccessary, replace with ngk or nd spark plugs.

Nov 08, 2009 | 2002 Nissan Altima

1 Answer

Extreme miss in engine


Hi ,
Ok you`ve done the usual components that fail now you need to plug into the system and read the live data and let the engine show you what it see`s the problem should be fairly obvious,you need to check the inlet hose for leaks and they also have a crankcase ventilation pipe under the inlet manifold that fails giving an air leak LeaN MIXTURE =MISFIRE the live data will show you the mass air flow sensor readings and also the engine coolant sensor can cause misfiring by over fuelling fouled plugs or black carbon deposits on the plugs,to be honest the possibilities are infinite unless you have the right dedicated jaguar software a simple code reader is ok but will only give basic data,hope this helps

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