My wife's 2005 Escape V6 started missing, and threw a misfire #2 code. It was overdue for a spark plug change (140,000 miles) so I changed them. I also swapped the #2 and #4 COPs just in case it was a coil problem.

After changing the plugs, it ran much better but was still missing at certain speeds. The code that came up was P0403 EGR malfunction. I checked the engine and realized that I had forgotten to reattach a wiring harness. It was not on the EGR itself, but just behind it. I reattached that wire and drove it again. It ran even better than the previous test drive, but it was still missing a little bit. When I got home, I disconnected the battery overnight to clear the code and wanted my wife to drive it today to see what it did.

She said it started off fine, but as she drove around running errands it started dying and was very difficult to restart. She limped it in to get the codes read again, and then limped it home. It's showing P0351, P0352, P0353, P0356, and P0755. I've done a little research on this site and others, and it doesn't look like these COP codes usually come up all at the same time. It's certainly possible I screwed something up when I changed the plugs, but I'm not sure where to start looking. One thing that has me concerned was the RF interference issue that some 2005s had with their factory plugs. It's never been an issue before, but now I wonder if the new plugs might have had the same issue. The replacements I used are Autolite platinum.

Does anyone have any advice for me?

 

Any chance you saved the old plugs? If so, I'd throw them back in and see what happens. Kind of a pain in the neck but won't cost anything but time.

 

Four months ago, my step daughterʻs 05 Escape was a NO start one morning.

Her dad had the truck towed to a near by shop to have repairs made.

Shop owner replaced all the coils, upon re starting the truck, the PCM was

damaged.

A new PCM and coils were installed.

Unfortunately, I do not have all the details (what parts were installed, CEL

prior to failure).

I feel that the new coils were a factor to the issue.



I would have the PCM checked for damage.

First make sure ALL connections are secure and that grounds are good.

There are several threads here regarding 05 computer issues.

 

p0351 is Ignition Coil A Primary/Secondary Circuit
p0352 is Ignition Coil B Primary/Secondary Circuit Malfunction
p0353 is Ignition Coil C Primary/Secondary Circuit Malfunction
p0356 is Ignition Coil F Primary/Secondary Circuit Malfunction
p0775 is Pressure Control Solenoid B

check all the wires that had to be removed at the coils and fuel pressure solenoid and be sure they are on tight. get a hold of a scanner and clear the codes properly drive it to reset the readiness codes. then see.
as to the other man replace a pcm? sounds like a rip off there. coils yes we replace them a lot. ford with some have a extender on the coil that should always be changed with every plug change

 

I did a lot of research on this, and the consensus appears to be that bad coils can, but usually don't damage the PCM. Most people only get a code for one coil, so I was worried that the PCM was damaged. But since I needed new coils anyway, I decided to just change those first and see what happens.

I bought cheap coils ($77 for the full set) on Amazon and installed them. It was a little harder than the originals to get the wire to lock on to the coil, but once I got them on and installed the car is running great. I took it on a thorough test drive, simulating the conditions that were making it misfire before, and so far there hasn't been any misfiring or hesitation. I'd like my wife to spend some more time driving it before I'm completely satisfied, but so far so good.

 

I had 3 coils go at the same time, yes multiple coils can go simultaneously. Had two go about 2 years ago, and now just a few months ago 3 of them went. Have only one orginial coil and its in the front bank of plugs so its easy to change if it goes. After 155K I guess nothing lasts forever. Nothing wrong with my PCM. Had all the plugs changed at the same time. Should be good for another 155K. Except for that one coil pack!