Question about 2000 Ford F150 Flareside SuperCab

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PO 305 misfire changed plugs wires and coil still have code

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  • Ray Davila Apr 21, 2013

    MY CAR JUST GOT REPAIRED WITH THE PO 305. SOLUTION WAS TOO MUCH CARBON DEPOSIT ON THE EXAUHST VALVE ON PISTON # 5 MAYBE DO TO INPROPER OIL CHANGES OR LOW OCTANE GAS

  • Ray Davila Apr 21, 2013

    I FORGOT THE HEADS HAVE TO BE REBUILD. MAKE SURE U TAKE VIDEO & AUDIO OF UR CAR BEFORE U TAKE IT IN TO UR MECHANIC.

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It is a misfire on cylinder 5 it can be caused by low fuel pressure or a defective coil or bad injector, it could also be valve adjustment on that cylinder. Please rate me for the help I have given and if you need more info just post and I Will answer.

Posted on Jul 29, 2009

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Posted on Jan 02, 2017

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What does po 305 cylinder 4 misfire mean? Po 316 misfire on startup? po 300 random misfire? Po 305 Cylinder 5 misfire?


Hi Micaela:
I'd be looking for ignition problems like shorting out spark plug leads or a bad distributor cap. Try running it in a really dark place and see if you can see sparks around the plug wires.

May 13, 2015 | 2004 Ford Explorer Sport Trac

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Po316, po 300, po301, po305 2004 ford freestar


These codes are making me lean towards the ignition coil pack.My stepson's 2001 Sable 3.0 v6 had one cylinder misfiring(5-code P0305),which shares a coil with cylinder 1(code P0301).I diagnosed it by trading wire 1 and 5 at the coil,and the code changed to P0301.You have codes for the two cylinders on the same coil,so this is most likely it.(these codes would also trigger P0300(Multiple Misfires Detected) and P0316(Misfire Detected First 1000 Revs)).

Oct 14, 2012 | 2004 Ford Freestar

1 Answer

What's your problem? my 2004 mercury monterey has eight codes ,po301,poo53,po106,po316,po300,po304,po305,and po306


PO 300 is multiple misfires detected
PO 301, 304, 305, 306 are misfires in cylinders 1,4,5,&6
PO 053 is HO2S Bank 1 Sensor 1 Heater Resistance
PO 106 is MAP/BARO CKT Range / Perf
PO 316 is Misfire detected 1st 1000 Revs.

On a misfire, I usually push towards the spark plugs, plug wires, and coil packs / distributor coil.
You have PO 106 and PO 053 that need to be inquired about at nearest AutoZone.
They can give you an idea as to what is the problem on these.

Did a MAP sensor **** out and cause all the misfires ?
Did a misfire cause the MAP sensor error?
You see what I'm saying ?...Something caused all the misfires...thinking MAP...but not that familiar with the function of the MAP.

Hope this helps...

Aug 13, 2011 | 2004 Mercury Montery

1 Answer

I got code PO 305 on a 2002 Mercury Grand Marquis, what is the spark plug wire part called, is it #5 coil, and should I replace the coil and spark plug and what should the spark plug be gapped at? Thank...


I got code PO 305 on a 2002 Mercury Grand Marquis, what is the spark plug wire part called
This will have a direct coil over ignition with a coil over each spark plug. The coil is the electrical part over the spark plug. The coil also has a rubber part that is called the boot or spark plug boot. The boots can be purchased separately but the coils will come with new boots.

is it #5 coil,

Have you checked to see if there is any spark coming out of the number 5 coil?



and should I replace the coil and spark plug and what should the spark plug be gapped at?

When was the last time the spark plugs where changed? It may be due for all the spark plugs to be changed. The spark plug gap is usually listed on the emissions sticker under the hood. It should be .050 - .056 or very close to that.

May 16, 2011 | 2002 Mercury Grand Marquis

2 Answers

Scanner is showing code p0316. Misfire first 1000 revs. What can cause this?


A cylinder misfire

Forget the PO316 and 1st 1000 Rev,that is a Ford thing

No other PO Codes? PO 305 for cyl #5?

If you have individual coils (COP Ignition )
one is bad. Last number of a 300 code is the cyl
maybe. Unless it is really bad,then get back here
for more help

Feb 26, 2011 | 1998 Lincoln Town Car

1 Answer

What would cause a cylinder 5 misfire in my 2002 jeep grand cherokee 4.7L


04jeeplibertypo305changedinj coil plug counters stayed high for #5 saw spikes on other cyls changed chk sensor no spikes on any misfire counter a week later back with a po 305 ?

May 14, 2010 | 2002 Jeep Grand Cherokee

1 Answer

PO 305 misfire on 4.2 2000 f-150 changed plugs,coil pack and wires still have problem any suggestions?


Faulty or clogged injector. Engine mechanical issue (low compression, bad valve). po305 is misfire of #5 cylinder. Look specificly at the cylinder for the problem.

Jul 29, 2009 | 2000 Ford F150 Flareside SuperCab

2 Answers

Engine light comes on. Code is PO305 #5 cyl mis fire.


po 305 is cylinder 5 misfire detected. I would check the plug wire for starters

Jan 30, 2009 | 2005 Chevrolet Colorado

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