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How do I check for a bad coil and which one replaced three coils last year but don't know which ones where replaced ford f150 4.6 engine

The engine light is on it hi sates than gets a burst of power

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To check coils, a lot of people remove the boot from the coil one at a time to see spark. Wear rubber gloves though - it won't kill you but the shock is unpleasant.

Posted on Nov 12, 2014


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I have a 03 ford explorer codes p0307 p0316 what could cause that injects good

You have to use Google to find your codes
& study OBD2 Systems
Forget the PO316
The PO 301 thru PO 308 are engine cylinder misfires
On a 2003 --11 year old ford veh you replace ALL
8 COP Ignition Coils
They only last about 6 to 7 years
Some will set a PO300 code
Some with set lots of codes even with just one bad coil
Some coils are so bad they will shut the engine off anytime
& any where under any conditions or temp
There are alos 3 or more ways to diagnose the coils
With no experience & over 7 years on them,buy all 8 coils
from Rock Auto & replace
Also the front Oxygen Sensors get replaced at 100,000
The last number as in your 307 is cylinder #7
Some fords you have
A,B,C,D,E, etc
1,2,3,4,5 etc
PO 301,302,303,304 etc
All 3 examples are the same thing or cylinders

Aug 10, 2013 | Ford Cars & Trucks

2 Answers

Spark plug and ignition coil problems.... plugged cat?

romove poping plug start engine if thier is major air pressure coming outyou have ahole in your piston replace piston overhaule kitand new piston possible thred damage on head,replace cat,and get a dog:) good luck.

Feb 22, 2013 | 1998 Ford Expedition

1 Answer

Has a p0301 code mis fire #1clylinder , what is this problem

Just what the code & you said

Cylinder #1 (PO301) is misfiring,you have
a bad COP (Coil-On-Plug) Ignition Coil that failed

I have a 2004 LS V8 I have had one fail twice &
I had 7 fail at once ,all in the last 2 1/2 years,very,very
common on fords with cop coils

The codes on a LS are not always correct if you
have a really bad coil.

I have replaced coils based on a code as you have
I have had to walk a new coil from one cyl to the next
I also have used professional scan tool software on a note
book successfully & recently had no luck with that &
just replaced the remaining Original ford coil

So you have to learn as you go & kind of get involved
& make love to the all troublesome fords & lincolns, some
shop don't care for

I order my coils, etc from Rock Auto.Com
About 30% less than autoparts store

You can do yourself if you have a V8
If you have V6 you can do the driver side
& the pass side you have to remove the
upper intake,so then you do all 3 coils
bad or not, & save them for another day

If you go to a shop they better be on their game
& not throw parts at it

I have had a bad battery cause similar issues
I have had a bad battery cause all sorts of throttle
body issues.

Stay away from a dealer
I have seen people spend $2,500 with no results,
when a $59.00 coil & 1/2 hour of your time, would solve
the problem,IF you know the routine

Cylinder Location --Front to Back

1-2-3-4 pass side
5-6-7-8 driver side


Oct 19, 2012 | 2005 Lincoln LS

1 Answer

My lincoln keeps ETC and have had coils replaced three times (2 years ago) same problem is there a recall for this issue

No recall

Have the same car

You haven't had the correct coils or all
the bad ones replaced each time there
was an ETC Light

No one likes that car but me, or can solve the issues

Even professional scan tool software I have, doesn't
always get all the coils,need to walk a new one sometimes

Good Luck finding someone who knows & likes that system
& fords. Too bad your not my neighbor,I could solve many
issues for you,you don't even know you have.

Rock Auto.Com has the coils from Wells, for about $50.00

If you have a V6 the your in trouble with that intake manifold
having to come off.

Sep 19, 2012 | 2004 Lincoln LS

1 Answer

I replaced the coil the engine ran good drove it shut it off and the coil is badgain

It is possible that you have had 2 bad coils, but it's unlikely. You don't say what the history of the second coil was or if it was new, or had been working reliably before you fitted it. You also don't say whether you fitted a third coil. I think I would be looking carefully at the wiring to the coil, maybe there is a bad connection. It is also unlikely that the coils are being destroyed by anything else After getting it going have you re fitted the second or first coil to make sure they still don't work? Finally you have you checked the ballast resistor if there is one and whether you have used the correct voltage coil.
Also see here you may find this helpful

Nov 03, 2011 | Cars & Trucks

1 Answer

Have 1998 toyota camry LE 3.0 5 cylinder. Has been running rough for about 2 weeks. Check engine light came on. Test said spack issue on cylinder 5, Had this problem once and was coil pack. could it be the...

A fuel filter would not have an effect on one cylinder
& you know how long it was in the car
It could be there 3 to 5 years & be just fine

Don't assume that a code last time that pointed you to a bad
coil will happen that way again.

Codes don't really tell you to change anything
You could have a code for #5 & walk a new coil for 4 cyl's
until you get to # 6 now you found the bad one.

You have several coil packs that feed more than one
plug, you have more to consider

I approach this the way I am, as you most likely
can not test anything, because you lack the proper
equipment ,so you have to do things the hard or longer
way of trial & error. Just don't throw money & parts at
it in doing so

Are the O2 Sensors really old? Over 80,000 miles
Do you have any vacuum leaks including exhaust before
the O2 & converter?

Sep 22, 2011 | 1998 Toyota Camry

1 Answer

How to change the #3 coil pak in a 2007 ford freestar

You unplug the coils wire connector

Remove 1 bolt holding the coil
Should be 7mm or close to that

The coil should be about $70.00
at parts store

Only change it ,if you got a PO303
Code. The last # is the cylinder

Don't be supprised if that isn't the bad
coil. If you have problems I will walk you
thru how to move a new coil to the bad
cyl ,without all the test equip the pros have

Usually the #3 will be on the engines right
or pass side at the back,on a V6

If your engine is transverse it will be
next to the dash or firewall. I don't
have all that off the top of my head

May 26, 2011 | 2007 Ford Freestar Limited Minivan

1 Answer

Is Ford still repairing the coil problem on the LS V8 2003. I had one done in 2008 (it was covered by Ford) and forgot about it. The Check Engine light came on so I had another coil fixed at another shop...

Never go to a dealer
If you don't do your own work, stay with the
local repair shop

Your out of warantee a long time ago

You will loose one or two coils a year
They are $59.00 at the auto parts store
One bolt,10 min ,and your done

If you have a V6 and they go bad on the pass side, you have to
remove the upper intake for coils or plugs

Other fords the same. You know what not to buy next
time, or look over the motor first

I have spent $59.00 on my 2004 V8 and others
on this site are up to $4000.00 at a dealer and nothing
fixed,point made.
You need to know the technology and how it works,test
first,not the dealer way,then replace parts if necessary

Dec 15, 2010 | 2003 Lincoln LS

1 Answer

2000 expedition 5.4 lt run fine when cold when warm misses bad anyone know whats wrong??

a very common problem for the 5.4 fords is the coil packs going bad. normally misfires once heated up and under slight load ( in overdrive going up a grade) if the check engine light is on, it can help pinpoint which cylinder is misfiring. if plugs haven't been replaced within last 50-60k miles, plan on replacing plugs, and usually the coil pack that goes bad is one of the rear ones, but impossible to tell without a scan tool. if you don't own one, take it to a shop

Feb 20, 2010 | 2000 Ford Expedition

2 Answers

I have no spark i replaced the spark plugs spark wires and the coil pack and still nothing my power distribution box is fine any ideas

Crank engine with distributor cap removed, is it turning?
(That is if it has a distributor cap, some newer cars don’t have one)is it turning?
Broken timing belt or chain?

Are you getting power to the + positive side of the coil (small wires) with key on ? Hint; I use a needle pushed into the back of the plug so as not to damage the wiring.
If you have power then wiring from the ignition switch is OK. It usually is.
Hook your test light to the - negative side of the coil (one end on the - terminal and the other end on a ground). You should have power on the - side of the coil with the key on and engine off.
Crank the engine while watching the test light. Get a flashing signal at the test light when cranking?
If so and you have no spark the coil is likely dead. (don’t rely merely on resistance tests for a coil, a weak coil can test ok for resistance but still give no spark. It happens but is unusual. I learned this the hard way!)
No flashing signal?
Check continuity in all primary circuit wiring for opens.
If they are good,
It is time to check the pulse generator in the distributor. (That is if it has a distributor cap, some newer cars don’t have one, if it doesn’t then the ECM or computer sends signal via the crankshaft position sensor and the camshaft position sensor)
With the engine in non-running condition connect your A/C voltmeter to the pair of wires at the pulse generator and crank the engine. You are looking for an A/C signal that makes 4-6 volts of A/C. Got this? If so the ignition module is dead or has a bad ground. If not (more likely) you have a dead pulse generator in the distributor.
If you have three wires in the distributor signal wire you have a Hall effect sensor. I forget how to test that one. (Chrysler stuff)

If this part of the primary ignition tests ok then check wiring to ECM pinouts for opens. Wiring tests ok. ECM as last resort.
Hope this helps...........

Sep 29, 2009 | 1992 Ford Ranger

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