2005 town car, cleared the P0308 and P0358 code, could it be the PCM ?

10

Asked by 05TownCarPCM May 23, 2020 at 11:25 PM about the 2005 Lincoln Town Car Signature Limited

Question type: Maintenance & Repair

Car starts and accelerates fine, issues start when slowing down, but does not stall out. Changed coil and plug twice, putting in new, drove for 30 minutes and then the Check Engine Light comes on and stays solid.

3 Answers

10

Thank you for your response. So this leaves the PCM itself, maybe the fuel injector or the plug on clips to the coil or fuel injector itself. Will let you know the outcome in a few days. Just another thought, if the PCM cannot control cylinder 8, why does the car run fine for 40 minutes, THEN the check engine light comes on and stays solid ?? Thanks again.

10

Also got this code. The P0316 code is a generic powertrain code related to the ignition system or misfire. When this code appears, a misfire has been detected on startup during the first 1,000 revolutions. Codes related to the P0316 include: Random/Multiple Cylinder Misfire Detected. So it appears to be the PCM itself. Will update, still checking it out.

10

Update on my code issues. I took the car to a mechanic to check it out. He recommended replacing the crank sensor and camshaft sensor, which we did. This did NOT fix the issue. We checked the new coil (that I installed) that replaced the old coil which was prompting code P0358 Misfire, that new coil checked out fine. So we pulled the new Champion Platinum Plug # 3401 which I installed and gapped properly. Bingo, there was the problem. The insulator was broken (defective) and would move during a compression stroke causing the misfire. We replaced the $4.50 plug and the car ran just fine. Lesson learned, DO NOT USE Champion Spark Plugs. I will be contacting the automotive store where the plugs were purchased and Champion Headquarters. So a defective plug caused a lot of headache and cost. Cost of both sensors was about $85.00 plus the installation cost of $120.00 for labor. The cam sensor is VERY EASY to change. The crank sensor is a ROYAL PAIN. So a defective $4.50 Champion Spark Plug cost me about $205.00 to repair these issues that didn't exist. Lesson learned, DO NOT USE Champion Spark Plugs. Should Champion respond, I will let you know what their answer was.

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