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Old 09-16-2015, 09:24 PM   #1
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mustang misfire help

I have 01 by 8 and 4 cylinders are misfiring both have spark and fuel both compression test come back great I'm so lost need help bad
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Old 09-16-2015, 09:29 PM   #2
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I have 01 by 8 and 4 cylinders are misfiring both have spark and fuel both compression test come back great I'm so lost need help bad

do you feel the mis-fire or just setting code for mis-fire
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Old 09-16-2015, 10:44 PM   #3
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How many miles are on your car?
Have the coils ever been replaced?
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Old 09-17-2015, 12:47 AM   #4
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Hope this helps buddy:

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Old 09-17-2015, 06:39 AM   #5
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Engine at 90k no check engine light it's missing do bad I can in plug coil it does nothing I've swapped injectors and coils around to see if that changed anything but got nothing thank you for all it help

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Old 09-17-2015, 06:42 AM   #6
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Just an after thought could intake leak cause this issue I spayed starting fluid to see if there was any change but got nothing could that still be issue?

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Old 09-17-2015, 08:21 AM   #7
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You pulled coil plugs and no difference in idle and switched them around still no difference its your coil packs

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Old 09-17-2015, 08:27 AM   #8
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On that same cylinders no matter what coil pack those cylinders are always dead

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Old 09-17-2015, 09:19 AM   #9
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Do a compression test.
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Old 09-17-2015, 10:03 AM   #10
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Are you SURE they have spark?


Have you literally seen the spark plug fire with your own eyes on those cylinders?


I had this same issue once, but the ECM was just simply not firing the coil at all.


I had brand new coils, brand new plugs, great compression-- still misfired.
Know why?


Computers. That's why. ***** computers man..
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Old 09-17-2015, 10:07 AM   #11
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Are you SURE they have spark?


Have you literally seen the spark plug fire with your own eyes on those cylinders?


I had this same issue once, but the ECM was just simply not firing the coil at all.


I had brand new coils, brand new plugs, great compression-- still misfired.
Know why?


Computers. That's why. ***** computers man..
Or you had a bad wire somewhere. OP very well might have this issue or it could simply be bad spark plugs. Or there is coolant down there fouling everything up.
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Old 09-17-2015, 10:13 AM   #12
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Or you had a bad wire somewhere. OP very well might have this issue or it could simply be bad spark plugs. Or there is coolant down there fouling everything up.
No I am certain. It was actually skynet attacking me again
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Old 09-17-2015, 10:26 AM   #13
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Yes I have spark pulled coil out while running

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Old 09-17-2015, 10:49 AM   #14
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Yes I have spark pulled coil out while running

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Remove the coil boot make sure there good I had a misfire coil boot had coolant on the side which gave me a misfire so I replaced all coilboots and no issues since


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Old 09-17-2015, 11:08 AM   #15
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none of this really makes any sense. There is spark, there is fuel, compression is good, but there is a misfire in cylinder 4 and 8, but no engine code?

either way, if the compression is in fact good, and moving coils and injectors makes no difference, then it must be a few bad spark plugs, since he didnt mention checking those. otherwise, if it was a bad wire to the coil or injector, he wouldnt confirm that there is fuel or spark.
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Old 09-17-2015, 11:53 AM   #16
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Yes I have spark pulled coil out while running

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Did you also pull the spark plug out from those cylinders and physically see them spark before you put them back in?

And how have you confirmed that you are getting fuel?

Please go into detail on this.

This thread is useless if you do not go into detail. Put a microscope on every factor here, basically.
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Old 09-17-2015, 12:37 PM   #17
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I have rotated all fuel injectors replaced all spark plug compression test shows 155 psi on all cylinders right now I'm changing intake manifold gasket as we speak

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Old 09-17-2015, 01:09 PM   #18
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none of this really makes any sense. There is spark, there is fuel, compression is good, but there is a misfire in cylinder 4 and 8, but no engine code?

either way, if the compression is in fact good, and moving coils and injectors makes no difference, then it must be a few bad spark plugs, since he didnt mention checking those. otherwise, if it was a bad wire to the coil or injector, he wouldnt confirm that there is fuel or spark.
Well with mine I had no code just a slight misfire so yes it is possible to have a misfire without throwing a code took me 3 months to trace it down lol

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Old 09-17-2015, 01:11 PM   #19
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I have rotated all fuel injectors replaced all spark plug compression test shows 155 psi on all cylinders right now I'm changing intake manifold gasket as we speak

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Your replacing your intake gaskets why is it leaking coolant because the slightest amount of coolant will cause a misfire

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Old 09-17-2015, 01:45 PM   #20
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I have rotated all fuel injectors replaced all spark plug compression test shows 155 psi on all cylinders right now I'm changing intake manifold gasket as we speak

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but did you put a noid on injector connectors to see if pcm is firing injectors.you have ruled out about everything else if your testing is correct
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Old 09-17-2015, 02:53 PM   #21
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I dont have noid test will have to round one up if this doesn't work

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Old 09-17-2015, 03:06 PM   #22
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I have 01 by 8 and 4 cylinders are misfiring both have spark and fuel both compression test come back great I'm so lost need help bad
Sorry, I missed the part about the compression test.

If the gasket change doesn't solve the misfire, go ahead and scan for any codes. They often will not trigger a CEL right away, so there could still be a pending code. If there is a code, it will help to diagnose this odd misfire.
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Old 09-17-2015, 05:21 PM   #23
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i dont have noid test will have to round one up if this doesn't work

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should have been checked right after finding you had spark and compression.what did the sparkplugs look like?
If you don't know a noid plugs into the injector plug on harness its a tool that flashs when pcm fires injector.
One wire is hot all the time. When pcm fires injector it applies ground to complete circuit and energize solonoid inside injector to open it
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Old 09-17-2015, 09:25 PM   #24
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Ordered noid and Bluetooth obd ii scanner

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Old 09-21-2015, 12:36 PM   #25
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Noid light came today it is flashing so that should be good then right?

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Old 09-21-2015, 08:56 PM   #26
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noid light came today it is flashing so that should be good then right?

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yes injector has signal to fire if noid is pulsing scan pcm you have checked everything else.you might want to run back over all your test.you did replace plugs right? They may look good and fire out of car but not under compression.
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Old 09-22-2015, 08:44 AM   #27
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Noid? Can someone explain please?


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Old 09-22-2015, 08:46 AM   #28
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its like a timing light. you wire it up, and it flashes whenever there is an electrical signal present. in this case, it will flash whenever a signal is sent to the fuel injector, in order to rule out an electrical issue.
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Old 09-23-2015, 11:48 AM   #29
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Ok I have a p0358 code

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Old 09-23-2015, 11:53 AM   #30
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Each ignition primary circuit is continuously monitored. The test fails when the PCM does not receive a valid IDM pulse signal from the ignition module (integrated in PCM).

Open or short in Ignition START/RUN circuit
Open coil driver circuit in harness
Coil driver circuit shorted to ground
Damaged coil
Damaged PCM
Coil driver circuit shorted to PWR
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Old 09-23-2015, 12:00 PM   #31
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Potential causes of a P0358 code include:
  • Short to voltage or ground on COP driver circuit
  • Open on COP driver circuit
  • Loose connection at coil or broken connector locks
  • Bad Coil (COP)
  • Faulty Powertrain Control Module
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Old 09-23-2015, 12:03 PM   #32
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Or you had a bad wire somewhere. OP very well might have this issue or it could simply be bad spark plugs. Or there is coolant down there fouling everything up.
its funny when years of experience positively correlates to "knowing your stuff"
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Old 09-23-2015, 12:14 PM   #33
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I think he check all of that already, from what I read above he has moved COP's around and problem did not follow but stayed on 4 and 8 cylinders, so I am leaning that there is a short in the circuit somewhere between the COP and the Control Module or the Control Module is bad!
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Old 09-23-2015, 12:41 PM   #34
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I'm leaning towards control module I checked the ground wires they are good I checked make sure getiing pulse to cool it's good I don't know what else it could be....

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Old 09-23-2015, 12:52 PM   #35
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I hate these types of issues they are a pain to track down! But sounds like you have checked all of the normal areas that would cause this type of problem! Last suggestion would be to take it to a trusted shop and have them take a look, hate to just throw parts at it and find it is something that was overlooked!
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