Engine light staying on

[Kevin Ray]

Go on my car a little and the engine light blinked a few times and went away. I tried to make it do it again but couldn't. Went to a buddy of mine mechanic shop to check it out and it was a Po300 code which was a cylinder misfire. He then performed a re-learn on it and now the engine light is staying on. Ford dealership can't take it until the 12th of May. Anyone have any suggestions, is it a quick fix?

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[95CobraR]

I'd say a bad plug wire. I say test all plug wires going to the spark plug.

 

[Kevin Ray]

It runs fine no miss at all and just turned 20,000 miles

 

[Deleted member 35644]

First impression is a failing coil pack.

 

[95CobraR]

First impression is a failing coil pack.

I've never heard of a failing coil pack. It's either busted or good--it doesn't fail slowly. ;)

Here:

Park it on a secluded road. Rev the Vodoo engine to 4000 Rpm. Drop the clutch. If it doesn't pull hard in each gear, you have a problem.

 

[Kevin Ray]

Did that and it still a beast but the engine light is staying on for some reason

 

[Deleted member 35644]

I've never heard of a failing coil pack. It's either busted or good--it doesn't fail slowly. ;

Sell that to someone who hasn't experienced it. 2006 Mazdaspeed 6, driven 80 miles with a failing coil pack. Not failed... failing. Drive until the sputtering and cel flashing starts, shut down & allow to cool, re-start, rinse & repeat. Drive it to the dealership the following Monday, no flash or sputter, CEL code was for a misfire. R&R, never did it again.

 

[95CobraR]

Sell that to someone who hasn't experienced it. 2006 Mazdaspeed 6, driven 80 miles with a failing coil pack. Not failed... failing...

You had an old worn out Mazda, and you think a Shelby GT350 thread is a good place to post it?

 

[Deleted member 35644]

You had an old worn out Mazda, and you think a Shelby GT350 thread is a good place to post it?

It's for the benefit of those who think they know everything. And this happened in 2007, so not old and worn out. See, you learned something again.

 

[Cobra Jet]

A P0300 misfire code is a generic "random" misfire code, it could have been anything that tripped it. A sudden change in load or throttle state can create a log event or a twitch in crank or cam sensor events can trigger a random misfire event.

If it were a cylinder event - whether spark plug/coil pack, it wouid have then been a specific misfire code that would be a P0301-P0308 (last # designates the cylinder).

You could swap coil to coil to try to find it, but without a starting point - meaning a specific cylinder misfire code - it's anyones guess at this stage.

This thread may give some enlightenment to Ford's misfire strategies:
https://www.mustang6g.com/forums/threads/good-tech-article-on-ford’s-misfire-strategy.108076/

Also here is a pdf snip from the Ford Shop manual. It's NOT VooDoo specific, but is S550 "Coyote" specific. I'm including it because it gives a bigger picture of how to diagnose a misfire events from the generic to the actual cylinder event codes. It's also most likely a similar process on the VooDoo, maybe someone can confirm OR include the same strategy/diagnosis for the VooDoo.
https://www.mustang6g.com/forums/attachments/hd-misfire-detection-pdf.538665/

--
Not sure what your buddy did at his shop as far as trying to clear the code or his relearn process - but you can also try disconnecting the battery for a solid 10-15 mins, then reconnect and see if the code clears.

If it does not clear, then I would start by checking any ground wires and/or do a wiggle test on the connectors for each coil pack, as well as anything else your buddy may have tampered with in the engine bay.

A relearn won't trigger the light to stay static... but who knows what he did.

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