Another Coil question.......

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LSC_YA

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Our 2001 LS8 was running great, Stopped and filled up with Amoco Ultimate and and was getting on interstate accelerated to get ahead of a group semi's. It was at about 4,500 rpm and it missed triggered check engine light. Put a couple of bottles of heat in case it was water in fuel.Ok, done a scan and cylinder 4 misfire, No longer valid but in memory.Idles and runs smooth as silk unless you make engine labor and then it will miss. My question does it seem like a bad coil or a cracked boot? My thinking is under load spark more likely to jump to ground by the way of a cracked boot.Would a coil be bad and still run smooth when not under a load, I would think it would either fire or not fire. thanks
 
thats a good as question especially the fact that u filled up with aamaco ultimate and then went on a highway n it happened because freakishly enough that is exactly wat happened to me but on left side number 8 i changed the pack and the boots on the rest didnt even think about that


wen i took it to the stealership they informed me on wat coilpak it was
 
My experience has been that the misfire is not all that noticable until you put the engine under load. It could be that the boot is bad but if I were going to crack the valve cover and replace the boot I would go the whole nine yards and replace the coils.
 
Have you had the coils looked at?....I have not read a previous post on your issue sorry...

Like I tell everyone, if one is bad and you have been putting down miles on it then the others will be stressed you are running a v8 on 7 with one missing so the others work harder and get messed up. Thats my opinion, I had the coil prob and the only way it stopped was replacing the bad coils the problem still occurred so I replaced the rest as well as they were not visibly blown but damaged from stress then it stopped.
 
have not looked at it yet,I will thursday morning. I called a friend at LM parts and said he had the coil 55.00 so i told him id be by thurs. morning.
 
OH and trust me I had that same thing happen with the semi's my issue was bad enough that the car cut out and left me fighting across 3 lanes of 100MPH semis costing up hill with no power to my components ....that was scary.

Steering a 4000 Lb car up hill with no steering after it stalled sucked to begin with.

Another thing that happens to my exp is that you should get a bunch of bad codes that dont make sense do to the electrical arc sent back through the cars system....if you are not seeing these "dumby" or "false" codes then it might just be a boot.
 
LSVIPDEMON said:
Have you had the coils looked at?....I have not read a previous post on your issue sorry...

Like I tell everyone, if one is bad and you have been putting down miles on it then the others will be stressed you are running a v8 on 7 with one missing so the others work harder and get messed up. Thats my opinion, I had the coil prob and the only way it stopped was replacing the bad coils the problem still occurred so I replaced the rest as well as they were not visibly blown but damaged from stress then it stopped.
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Not to step all over you but... the other coils don't see any increased load when one fails; they all run separate from each other and are unaffected by other coils.

However, you could reason that if one is going, others might not be far behind it (as the coils are likely from the same batch and will in theory have a similar service life provided no external factors are at play (oil intrusion, water intrusion). But even that is still speculation.
 
NateRW21 said:
Not to step all over you but... the other coils don't see any increased load when one fails; they all run separate from each other and are unaffected by other coils.

However, you could reason that if one is going, others might not be far behind it (as the coils are likely from the same batch and will in theory have a similar service life provided no external factors are at play (oil intrusion, water intrusion). But even that is still speculation.
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Ok so if the car is supposed to run on 8 packs and only 7 are working it wont make the others run harder seeing how the engine needs all 8 to perform the way it should....tell that to my LS and its Mechanic cause that was the problem we both considered and it runs like a champ, the visibly damaged ones were fixed and I got no where then the stressed out ones next after that it was fine and they verified that putting the millage on the car while runing it in less then satisfactory condition did damage the rest of the packs...Im not trying to run over you as well but if a cake asks for 3 eggs use all 3 not just 2..
 
LSVIPDEMON said:
Ok so if the car is supposed to run on 8 packs and only 7 are working it wont make the others run harder seeing how the engine needs all 8 to perform the way it should....tell that to my LS and its Mechanic cause that was the problem we both considered and it runs like a champ, the visibly damaged ones were fixed and I got no where then the stressed out ones next after that it was fine and they verified that putting the millage on the car while runing it in less then satisfactory condition did damage the rest of the packs...Im not trying to run over you as well but if a cake asks for 3 eggs use all 3 not just 2..
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Do you have any ASE certifications? Just curious, because I do. The load on a coil when we are talking about COP units is not altered when one unit goes bad. They are not interconnected on the same circuitry; they receive power from a wiring harness, store and compound that power through the coils then release it. To think that when one coil goes bad it can cause others to go bad would show a lack of the understanding of basic electrical theory. It's like saying scored cylinder walls in your number eight cylinder (lets pretend it was rebuilt and someone damaged the walls) is causing the same problem in the rest of your cylinders because it's loosing compression and not providing any power. Although they work together to provide a combined output, one is not related to the other.

The only way the "load" on a coil is increased is when RPM's increase because they don't have as long to regenerate. As you disconnect coils, the output will stay constant on the rest of the coils and the resistance does not increase. This is fact; I'm not making it up. One coil failing will not CAUSE your other coils to fail.
 
Pipe down killer... if you paid attention to what I said, I USED to be a mechanic. My profession now is in the realm of law enforcement and I have the day off. And petty rants? You must be referring to the SINGLE objection I took to wheels being called rims.

If you believe everything the mechanics and the dealership tell you... well, good luck! (they misdiagnosed your problem once already and their theory of increased load can't be wrong?)

I'm not arguing that the engine itself is not experiencing an increased load do to cycling a dead cylinder. But that increased load does not like-wise raise for your coil. If one injector fails, does it cause the rest to fail? That's essentially the same problem, just going from an ignition problem to a fuel problem. Injectors contain electrical coils as well called a solenoid; the failure of that solenoid will not cause the rest to fail, or work harder. The job of an ignition coil is to provide a spark. That coil will provide the same amount of energy for a given charge time and supply voltage, every single time for the serviceable life of the coil. There is nothing that will change that; even grounding out the coil doesn't change that. What that does is increase resistance through the coil, which in-turn generates heat and causes the coils inside the unit to fail. If you don't believe me, give the tech guys at MSD a call: 915-855-7123 (7-6 MST). Ask them if one bad coil on plug will cause other units to fail; after-all, they actually manufacture ignition coils.
 
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did you get the part about it happening on freeways....this means the engine is working veryhard...the rest of the coils must compensate for the loss causing you to give more throttle and the other coils working harder than they should......you are correct it dosent have a direct affect from one coil to another like a virus its the overall effect that counts. And as long as electrical current is arcing off of it it may indeed go back to the other coils.

Im not makeing this up its what the ASE certified Mechanics at Haldeman Lincoln told me this is FACT.
 
NateRW21 said:
If you believe everything the mechanics and the dealership tell you... well, good luck! (they misdiagnosed your problem once already and their theory of increased load can't be wrong?)
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Actually they kept blaming my "WHEELS" being 20" and my trany not registering the diameter, then they found the leak on the pack # 8 it was replaced and I still had the problem.....then I told them dont touch anything on my car but the packs replace them all they did a stress test and found that yes it did cause further stress. They got me new packs all around and my car runs better than new....

That is just to ironic for me,think about it....
 
ok this is getting out of hand. id like to add my two cents. if one cylinder or coil fails and your running on 7 then the others will NOT work harder. they will work the same as they are supposed to -1 cylinder which you will notice loss of power or if your only getting a miss once in a while then you will feel a quick hesitation while driving. but the others will always perform to specifications. they will not compinsate for the one cylinder giving a problem. a miss will feel the same as a car thay has 1 bad plug wire that is arching out. and fyi i am a lincoln ase tech. so you might wanna go to a more reputable dealer.
 
OK - Lets all settle down. I deleted all the bad posts. Lets try to get back on topic and treat each other with a little respect.
 
Update

Changed the #4 coil today and the miss is gone. The plug wells was dry, which I was glad to see. When first started the check engine light was still on, and still missed. I unhooked battery for about 15 min. and tried again and check engine light was off and miss gone. Thanks to my sweet little wife and her small hands......So for now all is well...thanks for the help
 
37,283 miles on my 02V8...All this coil talk is fairly upsetting...
Between the coils and the tranny talk , what the hell did i get into?
Still got the sweetest ride in my subdivision tho...LMAO
ps.Thank god for women with small hands.
 
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ksbga said:
37,283 miles on my 02V8...All this coil talk is fairly upsetting...
Between the coils and the tranny talk , what the hell did i get into?
Still got the sweetest ride in my subdivision tho...LMAO
ps.Thank god for women with small hands.
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Hundreds..if not thousands..of LS owners read this forum. Those of us whose coils and transmissions are fine don't create posts to simply say that. So obviously the bulk of talk about coils and transmissions are going to be posts about issues. Not "hey, just letting everyone know my #8 coil is doing well today".
 
harsh

Ise....A little harsh there , but i see the humor in it.
I was only saying , I knew little about the Ls's when I bought ours , and see some disturbing trends with failures.
 
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Its the 50 thousand mile club. You might see more then the trans and coils...LOL...its frustrating at first but eventually it all gets straightened out and you'll love the car. Not everyone will face the same problems as far as transmission...I have not a single problem with mine but they did do extensive work to find out what was causing the shutter before they claimed misfire. The window was actually funny...the damn switch was going all by itself on the drivers door control panel and I hear the window...UP...DOWN...UP...DOWN.I looked in my side view and was like WTF!!! and saw it going up and down...Then I just laughed...I new it was coming from other reports I read but didn't know when, then it broke ( the motor brackets holding the window).....but I knew it was all the 50 K mile curse. That can be fixed in a day if they can get the parts fast....
 
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