Question about 2004 Lincoln LS V8

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Multi coil misfire diagnosis..called Autozone to buy parts, man says that's impossible without identifying which coils, says there is a underlying problem causing random misfires. I've had coils changed about 3 years ago, it fixed the problem so now I am confused. Also heat and air works on and off for about 3 weeks.Could the two be linked like a Vacuum leak like Autozone guy says?

Posted by Anonymous on

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I see these engine computers ( ECU ECM PCM ) fail a lot on these fords. Feel free to call us @ 888-672-4816 or 954-279-2040 and tell them Tim From FIXYA.COM sent you for FREE PROGRAMMING on YOUR NEW ECU ECM if you end up needing one. Could be a simple fix. Fault codes are a big plus. all of them matter.
Regards,
-Tim

Posted on Mar 27, 2015

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If you got a trouble code for this problem, what was the code? If you think it is a coil issue, check primary voltage and ground for the coil, engine cranking. Go from there

Posted on Mar 27, 2015

Testimonial: "yes, it runs but got "engine failure safety on"... turn car off.. then back on and drove to Tires Plus with no problems... tech hooked it up and said diagnosis was " multi coil misfire" without identifying which coil or plug... drove home fine but still shaking on idle."

  • jack layton
    jack layton Mar 27, 2015

    Some of the national brand autostores will check codes for free. Post the code number. It very well may be like Jeff posted.

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Do you mean Random misfire P0300 , that does not mean coils are bad . Most of the time a vacuum leak would cause this .

Posted on Mar 27, 2015

Testimonial: "yes..code p0300...also to note tranny bangs between 1 and 2.... and heat and ac randomly working or not past 3 weeks.. is that all caused by vacuum leak?"

  • Jeff Armer Mar 27, 2015

    Yes it is more then likey , the heater system use vacuum control actuators to control the heat an where the air comes out of the vents , defrosters, floor an so on ! Under the dash is where these vacuum actuators are !

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Cant get any spark from my coil packs on a 2005 2.7 honda santFe


1st off You have a HYUNDIA SANTE FE not a HONDA so check that you have the correct parts first.

Checking spark on these vehicles requires a special tool which shows the arc in line with the coil and plug.

An important point to keep in mind with respect to all types of ignition coils is that when the magnetic field collapses, the high-voltage surge has to go someplace. If it can't go to the spark plug, it will find another path to ground - which may be back through the ignition module, PCM driver circuit or through the insulation inside the coil itself. This can be very damaging to these parts. So never disconnect a plug wire or COP coil while the engine is running. It can be very damaging as well as dangerous to you should you become the path to ground. When a coil failure occurs on a distributor ignition system, it affects all of the cylinders. The engine may not start, or it may misfire badly when under load. But with multi-coil ignition systems, a single coil failure will only affect one cylinder (or paired cylinders in the case of waste spark DIS systems). 20406.gif On 1996 and newer vehicles, the OBD II system should detect coil problems as well as misfires and generate fault codes that identify the problem coil or cylinder. A misfire code P0301, for example, would indicate a misfire problem in cylinder #1. Of course, misfires can be caused by a lot of things. It could be a worn or fouled spark plug, a weak coil, a bad plug wire or connection in the case of a DIS or CNP system, a dirty or dead fuel injector, or a loss of compression (burned exhaust valve or leaky head gasket). Further diagnosis is always needed to isolate and identify the cause - which creates a problem on multi-coil systems that do not have spark plug wires because you can't observe the secondary ignition pattern unless you use some type of adapters or inductive pickups that fit on the coils themselves.
\ These also have ignition failure sensors that stop the spark if they sense a problem, like when you arc the cil to the block.

This is a very common problem with these vehicles they have a recall on some of them, check the hyundai web site for more info.

Oct 30, 2014 | Cars & Trucks

1 Answer

2004 Chevy HD 2500 ext cab v-8 vortec 6.0 liter 2 wheel drive. Let's see tons of problems misfire on cylinder 5 replaced coil(the issue), still runs like a beatin dog with one leg trying to chase the...


The sensor for the crankshaft position may be loose or misaligned. You may have a rust spot on the crankshaft interferring with the ability to pick up the #5 position.

Check out your alternator as stray electrical voltage will interfere with the pulses needed to fire individual plugs. Try WD40 on the wires to the coils(plugs) as stray voltage may jump to another plug.

You fixed what you identified, but how about injector pulses? Could easily misfire and give same effect as sparkmiss. You may need to get loaner tools from Autozone or others to test injectors with the lightbulb you insert in the injector harness.

I hope my solution is helpful.

Mar 03, 2012 | 2004 Chevrolet Silverado 2500HD

1 Answer

I had the check engine light come on, so I went by Autozone to have the code reacompd. The result was a cylinder 1 misfire. I then cleared the codes. The light came back on in a few miles. So I...


Yes you can have an "internitent" spark issue, because some misfires only happen under a specific condition, rpm, load, fuel trim. so first things first you have to find out what is cuasing the misfire, GM cars use a 3 pack coil system, and for the most part when you have a misfire on one cylinder you get it on 2 becuase each coil fires 2 times in the engine rotation, so you should pull the coil and check it with an Ohms on each post, now pull another coil pack and check that one agaist the other,then do this one more time with the last, this will give you a good idea, not foul proof though, of weather you have a bed coil before you go buy one, so lets assume that its not the coil pack, check your wire with a KV test, barrow one from autozone, the higher the Kv the faster the spark is going to ground, this will tell you if you have a bad wire / plug, refference it with the rest of the wires, very low Kv cirut is open or has a high resistance, very high Kv, shorted to ground. if it is non of the above then you are looking at replacing a controler that is under the coil packs, this can be tested with about a $6,000 osiliscope, but since you probly don't have one in your garage, better just test everything else and if that all passes just go buy a control moduel. Happy hunting...
Test, retest, and test again, Don't waste money parts swapping.

Mar 31, 2011 | 2008 Chevrolet Malibu Classic

1 Answer

CEL light flashing-shuddering when idle. 03 passat 1.8 Turbo. Thinking its an air leak somewhere? Can hear air but can't figure out where its coming from...


A flashing cel indicates misfiring. A common problem is a bad ignition coil. The easiest route for diagnosis is the check the trouble codes(autozone and some other parts stores will scan for free, or an OBDII code reader is not too expensive to buy). The code should tell you which cylinder is misfiring(PO301 means cyl #1, 302 cyl #2, etc). Once you know which it is, swap the ignition coils around. If you have a #1 misfire, swap coils 1 and 4, clear the codes, then check it again. If the misfire moves, you know you've got a bad coil. If the misfire is air or fuel related, as with an intake leak, other codes should come up as well as the misfire.

Feb 08, 2011 | 2003 Volkswagen Passat

2 Answers

97 v8 cougar check engine light is on autozone man said misfire on number 4 cylender doesnot missfire all the time what is the problem


You don't mention the DTC, but I assume the fellow @ Auto Zone knew what he was talking about. If it is an intermittent misfire, I'd first look into plug wires. A broken wire can sometimes misfire....but it'll only get worse with the passage of time.

Might be a really good time to consider a tune up....plugs, wires, air filter, etc.

Jan 01, 2011 | 1997 Mercury Cougar XR7

1 Answer

Engine hesitation, misfiring


Your car is equip with coil paks one of them is not working properly. Take it to an AutoZone or a parts store that will scan the computer and pin point which cylinder is doing the misfire. Buy the coil pak for about $65 dollars or you could take it in and pay $270 for the problem.

Feb 09, 2010 | 2002 Ford SVT Focus

3 Answers

Would a transmission flush cause misfiring valve, cylinders, etc in a Jeep Liberty 2005 (over 51,000 miles?


No. A misfire would not be from a transmission flush. A misfire would be due to bad spark plugs, bad fuel pressure, or bad compression.
If you have never done so, replace the spark plugs first. If it still continues take it to a mechanic for diagnosis.

Jan 12, 2010 | 2005 Jeep Liberty

5 Answers

2002 mercury sable. misfiring. taken it to get looked at. cant find why its misfiring. check engine light is on.


first take it to have the codes extracted then post them and I may have an idea as to what may be wrong with it. I know autozone will extract the code for free some other shops may as well.

Jan 02, 2010 | 2002 Mercury Sable

2 Answers

Random Cylinder Misfire


The cam sensor code is the part to concentrate on, also check the timing belt for excess play causing the camshaft to whip, this will cause a random miss.

Oct 30, 2008 | Saturn SL1 Cars & Trucks

7 Answers

Random Cylinder Misfire


The problem is the ignition control module such is under the coil packs. It seems to be an internal problem in the design. I have seen it many times and if you don't belive as many will not. So disconnect the modules electrical connector and just let it sit for two to three days. After that clean ir replace your sparkplugs, they will be fails up dew to it running lean and rich. Plug it in. Plug it in and wala its fixed $ but only for a week or two then back to the same thing so in short change the ignition module and save time and money, and don't forget to thank your friendly neighbor hood mexican mechanic.

Jul 09, 2008 | 2000 Buick LeSabre

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