Firstly, I wanted to say hi to the forum. Let me make this as least painful as possible. I have a 2007 E350 Super duty XLT van. Like a month ago my check engine light lit up. I scan it an got these codes p0171, p0174, p0300,p0304,p305,p0306,p0308,p0420,p0430. I understand the definition on the codes so I cleaned the MAF sensor for the first 2 codes. I checked the coil and found 3 out of the 4 coil bad.(got them replace). My thought for the other 2 codes 420 and 430 might be due to the misfires. Correct me if Im wrong. Well a week ago I got the some of the codes back 300,304,306,308,420. Any idea why??? I read somewhere where I can test the coil pack with an OHM meter but have no idea how and the instruction I read didnt make much sense? whats the resistance I need to look for? Can someone give me some some help? Can someone explain it like me would understand it. By the way I have another van 2005 e350 super dutyXLT and got similar codes 171,300,300,303,304,305,353,430,2195,2196 what are the chances that I might be something similar on both van. Someone said to check the fuel pressure regulator????? Any ideas???? I really need some serious help with this as these vans I used to transport kids with health problem. Any help will be much appreciate. Many thanks

 

First advice I'd offer is posting this to the Modular Engine Forum----its more engine related than E Series van for the most part.

I'd also add I'm experiencing something vaugely similar and have been advised to look for vacuum leaks.

As far as the COP testing resistance checking isn't that reliable---I had a bad coil that tested "good" yet still wouldn't fire. I simply removed it and reconnected to the wiring harness, held it close to a metal object and cranked the engine, looking for it to throw a spark from the electrode. No spark, connected a known good COP and repeated all this--got a good spark that time. This is probably the most reliable way to test a COP IHMO.

Best of luck!

 

thanks JWA I'll be trying something on mooday to see what happens.

 

The lean codes do not necessarily have to deal with the MAF. Lean codes can be caused by silly things like forgetting to put your Oil filler cap back on or if it doesn't seal. Any unmetered air getting into the engine can cause a lean code. Check the throttle body, there is a inlet on the front and the hose makes makes a sharp turn that often breaks causing that fault code. If the PCV value isn't in place (just hanging) you can get this code also. If your intake boots are cracked it will cause those faults also.