Ford F150 V6 misfire and egr codes

glowmunkey · **Joined:** Sun Sep 23, 2007 9:41 am **Posts:** 14

2002 F150 V6 - had a code P1400 for differential pressure sensor, egr flow insufficient, egr flow excessive, along with cylinder 3 misfire code and misfire in first 1000 revs code.

Symptoms are it misses under load and at idle (obviously, but trying to cover all the info here). 52K miles on the truck - plugs, pressure sensor and egr valve just replaced. P1400 code is gone now, haven't driven it enough for EGR codes to come back yet, cyl 3 misfire and misfire in first 1000 revs still present.

All plug wires tested good, switched #2 and #3 wires, cleared codes, STILL cyl 3 misfire. Truck runs only slightly better since plugs were swapped - blocked vac line to EGR, still the same misfire codes. Can the egr vac control solenoid possibly be at fault, given that the EGR valve is now disconnected from vac all together?

Any suggestions would be awesome, I'm thinking I might have to pull the #3 injector soon, but I don't have noid lights or any good way to test the injector itself, aside from swapping it to see if the problem moves with the injector... (when I pulled the plugs, there was no evidence of lean burn on cyl 3 or any other cylinders).

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jeff compton · **Posted:** Mon Oct 15, 2007 12:00 pm

It's not coil on plug? Have you checked for a vaccum leak?

Mohawkmtrs · **Posted:** Mon Oct 15, 2007 12:08 pm

Replacing the dpfe likely fixed the P1400.

Swapping injector #3 with another cylinder is a good idea. Also try swapping the coil pack with another coil pack and see if the misfire moves as well.

Good luck and keep us posted.

jeff compton · **Posted:** Mon Oct 15, 2007 3:12 pm

4.2 ltr? is it COP?

glowmunkey · **Joined:** Sun Sep 23, 2007 9:41 am **Posts:** 14

4.2, not cop, haven't tried swapping coils, it's a waste spark setup and the corresponding cylinder works fine. Going to try removing upper intake plenum, I've read about carbon buildup in the intact tracts of Fords due to the EGR.

glowmunkey · **Joined:** Sun Sep 23, 2007 9:41 am **Posts:** 14

Mohawkmtrs wrote:

Replacing the dpfe likely fixed the P1400.

Yup, so that was good, but the new EGR valve sure didn't help driveability...

Mohawkmtrs wrote:

Swapping injector #3 with another cylinder is a good idea. Also try swapping the coil pack with another coil pack and see if the misfire moves as well.

Good luck and keep us posted.

I could swap #3 and #6 wires at the coils to see if that changes anything, it'd definitely be easier than pulling out the injectors...

glowmunkey · **Joined:** Sun Sep 23, 2007 9:41 am **Posts:** 14

jeff compton wrote:

It's not coil on plug? Have you checked for a vaccum leak?

Shot some vacuum lines with carb cleaner, but figured that a vacuum leak wouldn't keep throwing only a cyl 3 misfire code... ?

jeff compton · **Posted:** Tue Oct 16, 2007 9:55 am

okay then! it's not a vacucum leak!

Kerry Ritter · **Joined:** Mon Sep 17, 2007 11:01 am **Posts:** 6

Is the number 3 cylinder on your engine the farthest away from your EGR valve? I had problem with my EGR port in my #1 cylinder NOT BEING PLUGED the other 5 where all pluged. My Engine was a 3.8 V6 Ford and has about 150K miles. I'm convinced that the emissions play an importance role on how well the engine will run, so don't dismiss that your miss could be related to your emissions circuit. Pulling my upper intake was easy, I don't know about your engine. Its hard to believe that 50K miles would develop such problem if you purchased the truck used, could it be that the Motor has more miles than you think?

Darkrooms · **Joined:** Thu Mar 29, 2007 9:44 am **Posts:** 1386

When you open your EGR valve manually with a vacuum pump, does the engine stumble and die? If you use the searchfeature you'll find that we just went over how to test the EGR system in Fords equipped with a DPFE.
If the engine stumbles and dies, then post back.

glowmunkey · **Joined:** Sun Sep 23, 2007 9:41 am **Posts:** 14

Kerry Ritter wrote:

Is the number 3 cylinder on your engine the farthest away from your EGR valve? I had problem with my EGR port in my #1 cylinder NOT BEING PLUGED the other 5 where all pluged. My Engine was a 3.8 V6 Ford and has about 150K miles. I'm convinced that the emissions play an importance role on how well the engine will run, so don't dismiss that your miss could be related to your emissions circuit. Pulling my upper intake was easy, I don't know about your engine. Its hard to believe that 50K miles would develop such problem if you purchased the truck used, could it be that the Motor has more miles than you think?

#3 is not the furthest, but almost - it's the furthest from the egr on the passenger side bank. Could be the problem - haven't had the chance to work on it again yet. I do believe the mileage on the truck is accurate, but if there is any way for an odd problem to develop on a vehicle, it will happen to one of mine...

glowmunkey · **Joined:** Sun Sep 23, 2007 9:41 am **Posts:** 14

Darkrooms wrote:

When you open your EGR valve manually with a vacuum pump, does the engine stumble and die? If you use the searchfeature you'll find that we just went over how to test the EGR system in Fords equipped with a DPFE.
If the engine stumbles and dies, then post back.

Gotta grab my vacuum pump and try it. Didn't find the post in my search... closest thing I found was the guy that just posted above with the Taurus/Sable with clogged egr passages.

glowmunkey · **Joined:** Sun Sep 23, 2007 9:41 am **Posts:** 14

Good grief! Listen to this- has anyone seen a waste spark system where one side of a coil pack goes bad, but not the other???

I never figured this was the issue, considering that the #4 cylinder shares the coil with #3, but I just swapped the wires at the coil and voila, my misfire goes to cyl #4. Here's to me thinking that I only had one issue... egr and coil failures simultaneously - woo hoo.

Guess I'm buying a new coil pack.

Mohawkmtrs · **Posted:** Thu Oct 18, 2007 7:22 am

Darkrooms · **Joined:** Thu Mar 29, 2007 9:44 am **Posts:** 1386

I wasn't aware that vehicle has a waste spark system. As far as I knew that died out in the early 90s. If you have a coil pack with two posts on it, it still may be direct ignition. Just a shared casing. How many wires to the coil? 2? or 4-5?

Ford F150 V6 misfire and egr codes

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