I have a 2003 V10 6.8 on a F53 frame Class a motorhome. Is it possible to get P0301,P0302,P0305,P0306,P0307 AND P0310 Bosch diagnostic code reader and vehicle still runs? I just returned fro a 4000 mile trip and noticed a loss of power going up steep hills and a minor rough idle. Plug # 2 blew out approx. 500 miles ago cyclinder was repaired and coil and plug are new.

 

If I remember those are intermittent misfire codes on the various cylinders. Yeah it will run but it is just missing occasionally.

 

Thanks for the info.

 

2X. That's correct.
Are there any other codes present? Including Key On Engine Off? If not:


Visually inspect the engine compartment to make sure all coils and spark plug wires are properly and securely connected.
Examine all wiring harnesses and connectors for damaged, burned or overheated insulation and loose or broken conditions.
Be certain the battery is fully charged.
All accessories must be off during diagnosis

 

Glad that we can help him, but WHY is this being asked here? It's Completely out of place. By about 30 years.

Edit, it has now been moved from the 1967-72 forum Into the V10 forum.

 

No other codes. Just changed plugs and rechecked. Comes up no codes. You must be on to something because the plugs looked good but had at least 35k on them. Thanks for your help.

 

Looked good? Gapped correctly? Genuine Ford Motorcraft plugs?
Come to think of it,was it doing this before your V10 spit out that plug? When you got your F53 back was it doing this then? If not before but yes directly after then this is that Repair Shop's problem. It could be as simple as their tech forgot to re hook the engine to frame ground wire.
*
With no other codes but still a mis-fire, next Ford is looking at the DPFE system. Look at yours and make sure the two approx. 1/4" I.D. hoses are hooked up to it and the EGR valve exhaust supply tube. if it is hooked up correctly and the wire plug is attached to it, here is how to test the DPFE. I borrowed it from a post Reuel did elsewhere on FTE. His post was not about a F53 but testing a DPFE would be the same.


How to test your DPFE sensor.


There has been a lot of talk about the DPFE sensor going bad so I thought I would post a "how to" test the sensor. You will need a volt meter, safety pin and a 3 or 4 ft piece of hose (about 1/4" ID). If you know where the sensor is located skip to the next paragraph. Remove the black plastic cover (3 screws) exposing the throttle body and other fuel related things. Its the cover in the center of your engine that says something like 5.4L or 4.6L on it. Now the DPFE sensor has 2 rubber hoses (about 3/8" dia) coming off the bottom leading in to 2 metal tubes which are leading into a 1" metal EGR pipe coming off the exhaust manifold. On the side of the sensor is a 3-wire connector. This assembly is the DPFE sensor.
Remove the 2 rubber hoses from the bottom of the sensor. Attach a piece of rubber hose to the forward most hole in the sensor. Now carefully take a small safety pin and stick it in behind the top wire parallel to the wire. You do NOT want to pierce the wire, only make contact inside the connector. This top wire is the active feedback signal wire. It will vary from 0-5 volts or so. The middle wire is ground. The bottom wire is 5-6 volts supply. Now the top wire voltage will vary as the pressure between the two holes in the sensor varies. Set your meter to read volts, either turn the key until the accessories are on or start the engine, either way is fine. Now using your mouth apply suction to the hose and you will see the voltage change from near 0 to near 5 if you apply enough suction. The vacuum on the hose should hold your tongue and not leak. If the voltage does not vary or is stuck high or low, the sensor is bad. Do the same thing to the rear port but the voltage difference will be much less, this is the reference port.
If the sensor seems to be working then you can further test the system by doing the following. Attach the hoses to the sensor as normal. Now remove the rubber vacuum hose from the top of the EGR valve diaphragm. With the truck running apply slight vacuum to the EGR valve and this will open the EGR valve. When the valve opens you will see the voltage on the top wire of the DPFE sensor change indicating flow. When the vacuum is applied your truck should stumble or almost stall indicating the EGR valve has opened which it normally does not do at idle. I hope this helps

 

Moved to V10 forum