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Engine code p0354


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29 replies to this topic

#1 Tlove1

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Posted 16 November 2016 - 01:56 PM

I bought a 06 lincoln zephyr with 186k on it for 700 dollars. It had a misfire but I'm pretty good with cars. I get it back to my house and run the engine code and got a code of p0354. Ao.I replace all the spark plugs and wires, but the misfire still is there. So I go to cylinder 3 coil packs and I check the wire which was in really bad shape. I replace the wire and the misfire is.still there. I'm getting a reading of 11 ohms on my plug. I'm thinking the pcm is bad. Can anyone give me some advise before i shell out 300$ for a new one





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#2 Tlove1

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Posted 16 November 2016 - 01:56 PM

I meant to say cylinder 4 coil wire had promblems not 3

#3 drolds1

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Posted 17 November 2016 - 03:15 AM

Right. P0354 corresponds to #4 cylinder.  Common Ford problem.  If the wire was melted, most likely the PCM is bad.  Did you replace the coil.  Try swapping coils with another cylinder and see if the code changes.

 

Before replacing the PCM, see this video for diagnosis.

 

If the CEL is flashing (misfire), don't drive the car as this will eventually destroy the catalytic converters and that gets expensive. 



#4 Tlove1

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Posted 17 November 2016 - 09:33 AM

Thanks for the reply. Yes I bought 6 new coil packs in sparkplugs. There is zero spark going to cylinder 4. When I took tape off of cylinder 4 wiring harness the left wire fell off like I cut it ( which I didn't). Also there were three places where it looked like someone spliced into the wire. I cut the wire and installed a new wire and connector. Still got no spark. I check the resistance in cylinder 4 connector and it was about 11.3 ohms. Which was weird because all other coil packs connectors were at 6.4 ohms. Could this be because pcm was giving bad signal to cylinder 4 or does it mean I have a short in cylinder 4 wiring harness.

#5 drolds1

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Posted 17 November 2016 - 01:14 PM

When the PCM is at fault, the old coil/and or wire melt.  So if they weren't, then it might be the circuit. See if this is any help even if it's not for your engine specifically.


Edited by drolds1, 17 November 2016 - 01:15 PM.


#6 Tlove1

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Posted 17 November 2016 - 01:27 PM

So I took apart cylinder 5 coil pack wiring harness today. Well I found out that someone spliced the wires and twisted them together and taped them off smh. I took them apart cleaned them taped them off (separately) and connected the plug back in... now waiting for my pcm to get back. Do you think this is the issue I'm having. And why is it I was still getting spark from this plug.. even though when I did spark test the spark was orange.

#7 drolds1

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Posted 18 November 2016 - 01:55 PM

I thought the issue was with cyl. #4.  If you didn't have a P0355 code, the #5 should have been OK.  

 

I wonder why the wiring is so hacked up on this car.  Maybe it was rodent damage.



#8 Tlove1

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Posted 18 November 2016 - 02:02 PM

I have no idea. But cylinder 5 wires messed up..and when I performed a spark test the spark was orange.

#9 Tlove1

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Posted 18 November 2016 - 02:38 PM

So you don't think cylinder 5 had anything to do with the promblem.. like I said before cylinder 4 wiring was messed up also

#10 drolds1

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Posted 18 November 2016 - 05:00 PM

Yes, but you only had a code for cylinder 4.  It certainly can't hurt to straighten out the wiring on #5 as well.



#11 Tlove1

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Posted 18 November 2016 - 05:03 PM

Ok well I sent the pcm out. Cost me 316. But I made sure they tell me if it was bad or not... if it's not bad I have know idea what to do..I literally went threw half of the wiring harness. The only part I haven't gone threw is where the harness meets the pcm plugs. If it's not the pcm I'm going to be stumped

#12 drolds1

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Posted 18 November 2016 - 08:08 PM

Examine the plugs carefully.  They can get corroded and pins can get bent.



#13 Tlove1

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Posted 18 November 2016 - 08:40 PM

Ok they look new and you can't see the pins

#14 Tlove1

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Posted 18 November 2016 - 08:40 PM

Can I just spray some electrical cleaner in them

#15 drolds1

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Posted 19 November 2016 - 03:24 AM

Can't hurt.  This is sold at Home Depot and has good reviews and is afe on plastic.



#16 Tlove1

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Posted 19 November 2016 - 07:53 AM

Ok.. thank for all your help. I'll keep you posted

#17 drolds1

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Posted 19 November 2016 - 04:01 PM

OK.  Good luck.



#18 Tlove1

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Posted 19 November 2016 - 09:06 PM

Hey maybe you can help me out. What should the ohms be for the ignition coil connector from the harness. I surfed the Web and can't find the specs

#19 drolds1

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Posted 20 November 2016 - 03:09 PM

Neither can I but IDK how important it is.  They don't seem to test for that.  Here's a good article on how to test everything, including a section on testing the wiring to determine if the PCM is the problem.


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#20 Tlove1

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Posted 23 November 2016 - 04:43 PM

Ok so I got the pcm today. Put it in and everything is running ok.. now I'm getting a code of p0171 running lean I think. Now the engine is idling like Ime having a valve issue. Is it putting like that because of the engine code. Or is it that the valves might be sticking. The car was sitting for 8 months to a year






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