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

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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. 

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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.

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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

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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.

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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.

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

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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

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

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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

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

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

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Can I just spray some electrical cleaner in them

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

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

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OK.  Good luck.

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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

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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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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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Did you have the battery disconnected for storage?   If so, it's in the "re-learn" process. Drive it for a few days with lots of starts - run a number of miles - shut off, cycles.  Then see how it runs for you.

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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

 

Scotty kilmer has a video that is for that same code, and might be relevant to you. That code means too much air or not enough fuel. on my '10 the intake manifold was plastic. You can do his trick with the carb cleaner (or starting fluid) 

 

When i got that lean code it was also able to register that a cylinder was misfiring. I replaced that cylinder's injector (after getting confused about chevrolet cylinder numbering vs ford) and it worked fine after.

 

Edit: grammar

Edited by 4N1M4L

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Thanks for you responce.. im not getting a misfire code just bank 1 being to lean... i replaced the gaskets in the intake manifold. I also sprayed every hose with carb cleaner and also the intake and all over anywhere there could be a leak, nothing. Im trying to replace the bank one oxygen sensor as we speak and see if that helps.. Also im doing a furl pressure reading tommorrow to see if there is a glogged injector or something.

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Thanks for you responce.. im not getting a misfire code just bank 1 being to lean... i replaced the gaskets in the intake manifold. I also sprayed every hose with carb cleaner and also the intake and all over anywhere there could be a leak, nothing. Im trying to replace the bank one oxygen sensor as we speak and see if that helps.. Also im doing a furl pressure reading tommorrow to see if there is a glogged injector or something.

 

Any luck?

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Nothing yet.. its hard to start when its cold out andd when its been sitting. But once started it will start back up qith no promblem.. havwnt figured out the po171 code, no money. Also im hearing clanking knoning noise coming from bank 1... it only happens when the car is first started cold. Goes away within 15-30 seconds.

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