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Old 01-21-2015, 11:37 PM   #1
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Signs of bad spark plugs, or bad coils

Okay my cats aren't clogged. But I took it to a shop and we drove it. He said it could be spark plugs or coils. Possibly cylinder head. Can yall tell me what are signs of these?


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Old 01-21-2015, 11:40 PM   #2
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What's the car doing?




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Old 01-22-2015, 12:02 AM   #3
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What's the car doing?




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Okay, when I drive it normally it doesn't do anything. Idles kinda weird, but when I rev it up it doesn't make the noise. The only time It does is when I floor it. It will make this weird raspy noise. It will stop them make it that noise again. And it will keep on, even when I shift it will. While it makes that noise it acts like it doesn't wanna go and doesn't produce the power it should. The rpms will go up while the car doesn't.


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Old 01-22-2015, 12:09 AM   #4
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Alright another question How many miles on it?




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Old 01-22-2015, 12:10 AM   #5
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Could be bad cops like he said

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Old 01-22-2015, 12:15 AM   #6
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Another question does the car have a check engine light? If so what are the codes? When was the last tune up performed on the car?




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Old 01-22-2015, 12:18 AM   #7
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Sounds like it could be a bad COP.

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Old 01-22-2015, 12:30 AM   #8
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Alright another question How many miles on it?




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143,000 miles and no light. And what's a cop?...


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---------- Post added at 06:30 AM ---------- Previous post was at 06:29 AM ----------

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Another question does the car have a check engine light? If so what are the codes? When was the last tune up performed on the car?




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Also I got the car 3 months ago, so I don't know when the last time a tune was on the car.


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Old 01-22-2015, 12:32 AM   #9
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Let me give you a better description. It's hard to explain. Okay when that noise happens when I floor the car the rpms sorta decrease then increase. And makes the normal exhaust sounds.when it makes the raspy noise again, it does the same thing to the rpms. It doesn't produce the power like it should.


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Old 01-22-2015, 12:35 AM   #10
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Can you describe the noise?




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Old 01-22-2015, 12:35 AM   #11
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Wait is a COP the coils? Lol


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Old 01-22-2015, 12:36 AM   #12
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Wait is a COP the coils? Lol


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Coil on plug I believe is what the acronym is

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Old 01-22-2015, 12:38 AM   #13
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Can you describe the noise?




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Ummm, it makes this really weird deep noise. It sounds like a raspy type, that sounds very low. While it makes the noise the car doesn't run right but when it stops the car runs fine. Let me give you a better understand. When you gun it, and your traction control is on it makes that weird exhaust sound that sound raspy and deep. Kinda like that. But this is different. Just trying to describe it, it's really hard to explain.


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---------- Post added at 06:38 AM ---------- Previous post was at 06:37 AM ----------

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Coil on plug I believe is what the acronym is

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Sorry lol I'm a noob. And I took it to the mechanic and he said it could be a coil. Actually I took it to two mechanics and they said coils. Are they expensive to replace?


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Old 01-22-2015, 12:41 AM   #14
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Can you describe the noise?




If there's one thing I know it's Popsicles!

Even when I drive it at like low rpms it will make the noise, and sorta make the car run rough. The car doesn't respond correctly when it makes the noise. But when the noise stop it runs fine. But it continues to switch back and forth when the rpms climb up


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Old 01-22-2015, 12:42 AM   #15
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Alright, a good way to look at it is this lets try fixing the least expensive possible cause and go up. With that being said. I'd check the mass air flow sensor for being dirty. It could cause air starvation to the engine. Second check the throttle body for being dirty it cause the same symptom and worsen it.




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Old 01-22-2015, 12:48 AM   #16
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Alright, a good way to look at it is this lets try fixing the least expensive possible cause and go up. With that being said. I'd check the mass air flow sensor for being dirty. It could cause air starvation to the engine. Second check the throttle body for being dirty it cause the same symptom and worsen it.




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Do I just remove both and clean it? Don't use anything, just wipe it off?


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Old 01-22-2015, 12:54 AM   #17
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I use brake cleaner. It's strong stuff it will get any crap off of them. To clean the throttle body either have someone in the car (don't clean the it with the engine running) holding the accelerator to the floor while you clean it, or use the throttle cable with your hand. I'd recommend the first one, had someone at the shop I work at get their finger stuck in the throttle body and it wasn't pretty at all. Don't inhale too much of the brake clean fumes it will get you wasted (unintentionally happened to a coworker).




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Old 01-22-2015, 01:04 AM   #18
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I use brake cleaner. It's strong stuff it will get any crap off of them. To clean the throttle body either have someone in the car (don't clean the it with the engine running) holding the accelerator to the floor while you clean it, or use the throttle cable with your hand. I'd recommend the first one, had someone at the shop I work at get their finger stuck in the throttle body and it wasn't pretty at all. Don't inhale too much of the brake clean fumes it will get you wasted (unintentionally happened to a coworker).




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I will do this tomorrow! Il let you know if it helps the car! Thank you for telling me this as well!


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Old 01-22-2015, 01:06 AM   #19
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Signs of bad spark plugs, or bad coils

Bro before you do it make sure you got safety glasses or something over your eyes. If even a single drop of that brake cleaner gets in your eye, it will light up your world.
Speaking from personal experience.



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Old 01-22-2015, 07:52 AM   #20
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Bro before you do it make sure you got safety glasses or something over your eyes. If even a single drop of that brake cleaner gets in your eye, it will light up your world.
Speaking from personal experience.



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Thanks man, I'm gonna do this after school. I just hope I can get this fixed and go back to installing my mid pipe!


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Old 01-22-2015, 08:03 AM   #21
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I gotta ask ??????????

Why Brake Cleaner???????

CRC as well as Gumout make a Throttle Body Cleaner Probably more company's but these are two I know that do sell it.

Why not use it and not Brake dust cleaner????

Just wondering !!!
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Old 01-22-2015, 09:00 AM   #22
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Why Brake Cleaner???????



CRC as well as Gumout make a Throttle Body Cleaner Probably more company's but these are two I know that do sell it.



Why not use it and not Brake dust cleaner????



Just wondering !!!

Ronnie

We've tried throttle body cleaner. We use brake cleaner on nearly every job; exhaust work not so much. It has so many uses besides what it was made for. And brake fluid cleaned it quicker and better.




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Old 01-22-2015, 09:22 AM   #23
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Signs of bad spark plugs, or bad coils

Can't you just swap out the coils to see where the misfire is?
That's what I would do in my last car. I'm sure you can find out if it's plug or a coil that way.


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Old 01-22-2015, 09:28 AM   #24
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Can't you just switch the coils


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That's a good idea but he stated the car doesn't have a check engine light. If it was a coil that cylinder would develop a misfire and a DTC. Considering that spark plug wouldn't receive any voltage. But that is generally the way auto techs check to see if the coil is bad.




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Old 01-22-2015, 09:51 AM   #25
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I forgot to mention what ever you do don't get the brake clean on your paint.




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Old 01-22-2015, 12:40 PM   #26
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Don't use brake cleaner, period. They sell MAF cleaner and that's what I would use. You don't want to damage it. Also, make sure it's unplugged when you do this.

If it's running that bad, I would expect to see a CEL (check engine light). Just to clarify what I read up a few posts... When you punch it, it makes a lot of noise, RPM's go up, but the car doesn't really go anywhere?
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Old 01-22-2015, 12:46 PM   #27
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Don't use brake cleaner, period. They sell MAF cleaner and that's what I would use. You don't want to damage it. Also, make sure it's unplugged when you do this.



If it's running that bad, I would expect to see a CEL (check engine light). Just to clarify what I read up a few posts... When you punch it, it makes a lot of noise, RPM's go up, but the car doesn't really go anywhere?

Correct, the rpms go back and forth when it makes the wired low raspy noise. It will go back to sounding normal then go back to making the sound again. It does this through out the whole gear. I have to keep it in 4th because in 5th it will make the noise at low rpms and shake the car sorta


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Old 01-22-2015, 12:52 PM   #28
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Correct, the rpms go back and forth when it makes the wired low raspy noise. It will go back to sounding normal then go back to making the sound again. It does this through out the whole gear. I have to keep it in 4th because in 5th it will make the noise at low rpms and shake the car sorta


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Given that it's running that bad and you have no CEL showing, I feel like something else is going on, like in the drivetrain. I'm thinking you might have a problem with your clutch or throw out bearing. A clutch slipping can be noisy and if it's grabbing and slipping, it could seem like the engine is misfiring, etc. Does the noise go away when you push the clutch in?
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Old 01-22-2015, 12:58 PM   #29
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Correct, the rpms go back and forth when it makes the wired low raspy noise. It will go back to sounding normal then go back to making the sound again. It does this through out the whole gear. I have to keep it in 4th because in 5th it will make the noise at low rpms and shake the car sorta


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It could possibly be the injectors are clogged. If you've already tried cleaning the mass air flow and the throttle body that would be the next place to start. But to rule out the coil and spark plug they car needs to be driven with a diagnostic scan tool hooked up to it. You can monitor the engines misfires (if any).
Also brake clean will not hurt them what so ever. I've personally use it cleaning both of them on my cars with absolutely no damage what so ever. But use whatever you want just given an auto techs input on the situation.




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Old 01-22-2015, 01:12 PM   #30
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It could possibly be the injectors are clogged. If you've already tried cleaning the mass air flow and the throttle body that would be the next place to start. But to rule out the coil and spark plug they car needs to be driven with a diagnostic scan tool hooked up to it. You can monitor the engines misfires (if any).
Also brake clean will not hurt them what so ever. I've personally use it cleaning both of them on my cars with absolutely no damage what so ever. But use whatever you want just given an auto techs input on the situation.




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You'd think injectors causing it to run that bad would throw a code. Maybe the CEL bulb is out lol. OP, do you have a handheld tuner for your Mustang? If so, you can use that to read the codes in memory. If you don't, an auto parts store can read them for you.


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Old 01-22-2015, 01:20 PM   #31
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Signs of bad spark plugs, or bad coils

It's difficult to give an accurate diagnosis without actually see the car and witnessing the symptom. I've witness cars with injector issues not giving a DTC but the clutch and bearing are a possibility. The description he gives us is somewhat vague. I completely understand it is difficult describing a cars behavior over a keyboard. When it's much easier to give possible fixes in person.




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Old 01-22-2015, 01:23 PM   #32
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That's a good idea but he stated the car doesn't have a check engine light. If it was a coil that cylinder would develop a misfire and a DTC. Considering that spark plug wouldn't receive any voltage. But that is generally the way auto techs check to see if the coil is bad.




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Not necessarily I was reading somewhere that sometimes when they fail it is only effected noticeably under load and there for no cel

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Old 01-22-2015, 01:27 PM   #33
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http://www.fordf150.net/forums/viewtopic.php?t=64741
That is what I was talking about. My parents expy did the same thing with no code. Set of cops fixed it right up

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Old 01-22-2015, 01:31 PM   #34
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Not necessarily I was reading somewhere that sometimes when they fail it is only effected noticeably under load and there for no cel

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That isn't always the case. But it is a very good idea and often works. I'm basing my opinion on the fact the car has 145,000 miles and he isn't aware of a tune up being preformed on the car. But judging by the description he's giving us it sounds like the engine is being starved of fuel or air. As already stated it could be the clutch or bearing sticking.




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Old 01-22-2015, 01:34 PM   #35
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That isn't always the case. But it is a very good idea and often works. I'm basing my opinion on the fact the car has 145,000 miles and he isn't aware of a tune up being preformed on the car. But judging by the description he's giving us it sounds like the engine is being starved of fuel or air. As already stated it could be the clutch or bearing sticking.




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Just reread from the beginning. Didn't realize he has had it for 3 months, a tune up would be a good idea indeed.

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