2006 Mustang GT Misfire/Runs Rough

[Dacoda Williams]

Hello, I recently bought myself this 2006 Mustang GT as a project, I've always wanted one, I come from the world of clapped out Volkswagens, and I'm not as familiar with how these cars behave. I'll link a video, but the car seems to be intermittently down a cylinder, I've already done coils and plugs, is there anything I should look at next, any way to diagnose if its a fuel injector or another component, hit me with what you got. The car is stock outside from the CAI, and a cat delete the previous owner did, (and cherrybombs) the car is NOT tuned. Codes p0316 and p0300, video below of the sound/codes/it running.

https://youtube.com/shorts/ahQw3NL3jV0?feature=share

 

[KLJ777]

How did the plugs look when you pulled them? Was one or two fouled or lean ?

 

[Dacoda Williams]

How did the plugs look when you pulled them? Was one or two fouled or lean ?

No, they were all dry and looked fine actually, all 8 of them.

 

[Dacoda Williams]

How did the plugs look when you pulled them? Was one or two fouled or lean ?

Heres what they looked like, I know theres only 7, but I had to dig them out of the trash. The 8th one looked the same.

 

[JC SSP]

What CAI do you have?

Please post pics.

 

[Dacoda Williams]

What CAI do you have?

Please post pics.

I dont have a pic of it, at work atm, but its a basic no tune required SR performance one, I have a tune made, but it doesnt make a difference in how it runs tune or not.

 

[GriffX]

You can measure the resistance of the ignition coils. Should be around 4 kOhm (if I can remember correctly).
All coils should have approximately the same value.

 

[Dacoda Williams]

Yea, I neasured the coils and fi with a multimeter and theyre all within spec.

 

[07 Boss]

It's going to be tough to track this down but it looks like it's not effecting one particular cylinder so I would look at broader causes as opposed to individual ignition or fuel components. I mean it could be anything from a crank sensor to an EGR valve.

 

[moooosestang]

Are they aftermarket coil packs? Some of the aftermarket are notorious for misfires. how many miles is on the car? you are probably going to need to do a compression test to make sure the engine is healthy.

 

[Dacoda Williams]

It's going to be tough to track this down but it looks like it's not effecting one particular cylinder so I would look at broader causes as opposed to individual ignition or fuel components. I mean it could be anything from a crank sensor to an EGR valve.

Ill check both the EGR and Crank pos sensor, any reccommendations on how to check those parts, or should I just play it safe and order replacement ones ?

 

[Dacoda Williams]

Are they aftermarket coil packs? Some of the aftermarket are notorious for misfires. how many miles is on the car? you are probably going to need to do a compression test to make sure the engine is healthy.

The ones i pulled off were OEM, the ones I put on were aftermarket but all read properly with a multimeter, The car only has 130k, motor is original.

 

[Candy10]

Be a lot easier if only one plug was fouled lol. Have you done any data logging? May be able to track down the issue that way

 

[Dacoda Williams]

When i bought the car initially it had a code for a cylinder 2 miss, but after clearing and a few drive cycles that is what popped up, I guess I can take a datalog tomorrow to and from work and post it here.

 

[Dacoda Williams]

Lets hope I did this right, I went ahead and took a trip to my local Oreiley's, (had to pick up some 3m tape for mounting something anyways). I just hit datalog on my way before I headed out, played with the car a bit so you could see anything, I'm not an expert on what I should be seeing here so I trust yall's more experienced brains. (This run was done WITH a Brenspeed 93 tune made for my car with its mods and CAI, just wanted to rule that possibility out).

https://drive.google.com/file/d/1ETDDspFUfSBAKLJPeZKZCusvRgzmM_-J/view?usp=sharing

 

[Juice]

P0316 misfire at startup, google it.
Could be fuel/spark, could be crank sensor or cam sensor.
I would put stock airbox on and restore to stock (remove tune). This costs nothing to do.

 

[Dacoda Williams]

P0316 misfire at startup, google it.
Could be fuel/spark, could be crank sensor or cam sensor.
I would put stock airbox on and restore to stock (remove tune). This costs nothing to do.

I tried that before posting, I thought the same and figured it was worth a shot.

 

[XJCasper]

Random thought...

Have you verified that all 8 sparks plugs have not backed out? With my 2005, I had 2 sparks plugs back out. Happened 2 times in the first 1500 miles. After 50,000 miles, have not had any issues.

Reminds me. I should toss some new plugs in.

 

[46addict]

Compression test first to rule out the possibility of something more serious.
If that checks out then I would start looking at the crank sensor. If one of the cam sensors went bad I would think it would throw a cam sensor code for that bank, not a random misfire code.

Before you start buying parts though I would put the OE coils back on. Aftermarket coils get be trusted even if the resistance is good. Then pull back the wire loom on the coil pack/cam sensor/crank sensor wiring harnesses to make sure nothing is frayed or broken.

 

[MasterofDisaster]

I had a misfire back in May. I tried changing the plugs, but no effect. I tried changing the coils, but no effect. I could hear the fuel injectors working, so I took it to a shop w/ the expensive analyzers. Turned out it was my computer. I hope that's not the case for you. I would, at this point, take it to a shop with an analyzer.