Haven't seen Mad Max in a good long time...

 

I went to Bondurant driving school years ago when they were still using Ford. They had 18 Cobra Vic's. Were all built with the 32 valve cobra engine and 5 speed transmission. I'd try to get one of those. Marauder doesn't even come close. Most people who attended didn't want to take home the Cobra Mustang, they wanted the Cobra Vic just like myself. Already had a Cobra in my garage at that time.

 

She was a beauty.

 

Well since akdoggie inadvertently started this collective thread of people with knowledge, mind if I highjack for a second? If not tell me to **** off and I'll start a new thread but I figured y'all are the ones I want answers from anyway

Recently got a p0306 code along with a pending p0405... anyway to tell which one is causing which problem? If the p0405 caused my misfire and I replace the cop, will I just destroy another cop cause the p0405 was my issue or if I replace the egr sensor or valve will that grenade itself again because of the misfire? Just trying to figure out which side to start from.... or are they completely unrelated and came up at the same time?

 

I think you have that a bit mis-written. If you have a P0405, that is a EGR related problem, usually the DPFE sensor unit. The P0306 is a misfire of the 2nd cylinder on the drivers side. That is where you either have a bad COP, plug, wiring, fuel injector problems or low cylinder compression as the culprit(s).

These are two separate items, and both need to be corrected for decent runability.

 

Yeah sorry I was more vague than incorrect, I was wondering if I fixed the p0306 but it was the p0405 that caused the p0306 in the first place or vice Versa how do I tell which one to fix first so I'm not wasting money and breaking parts. But that's all a moot point I guess if they are isolated from each other and I just need to fix both because one doesn't affect the other. I swear I read somewhere that sometimes those codes can be connected so I didn't know which part to start with if that was the case.

Edit* wasn't sure if I just drew the short straw and had two separate issues arise at the same time or if they were related somehow

 

In this case, I doubt that one lead to the other. I'd fix the misfire in #6 first. You will still have to fix the 405 code, but do the cylinder first. That will keep raw gas from going down the pipes and into the converter, ruining the converter.

Check the plug first. Check the boot and spring. Use dielectric grease when you reinstall. You can move #6 COP and switch it with another and see if the misfire moves. Don't clear the codes yet. See if the 30x switches to the other cylinder. If you have live reading available, see if there is a misfire on the new switched cylinder.

Also, check your PCV valve and make sure it is working right.

 

Awesome thank you for the info! I planned to try swapping the cop, I have the torque app so I think I could tell in a drive or two if it switches. I just read to check the boots cz they could fail too, didn't know that but thanks for confirming that too. The pcv valve as been on my to do list for a while as well, probably just need to replace it regardless.

Yeah when my codes came up, I was 3hrs from home with a cow and trailer in tow... had to get home one way or another... read up that I may kill my cats but my rears were cutout by the PO and I figured worst case I kill the fronts and either cut them out and bypass the O2 sensors or put two hi flows in. At first the check engine light kept flashing every 10mins or so, so each time I immediately pulled over and shut the truck off, (3x after the initial light coming on) finally turned off overdrive and made it home without anymore flashing and less issues but still some nonetheless. (Tried turning off overdrive on the way down but for some reason I was screaming at 3800rpms lost the top two gears) with it on I stayed around 1800 and wasn't shifting a whole lot. Luckily on the way back when I turned it off again it only locked out the overdrive gear. Sorry for the ramblin, I had to leave town for work the next morning so I'm bored in a hotel room trying to get a gameplan for when I get back home. Thanks again!

 

Use Motorcraft parts for the best results. PCV --- use Motorcraft.

 

Yeah I replaced my plugs and cops about 1.5-2years again and I made sure to use only motorcraft, and will make sure to replace as well White89gt gave me a link for the motor craft pcv on Amazon, it's been sitting in my shopping cart; guess it's time to click buy lol