CEL no code???
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CEL no code???
I have a 2002 Expedition with a 4.6L. Last week the CEL came on and it started to run rough. When I connect my code reader it does not come on and I can get no codes. The code reader will work on mt 2005 GMC. It haso also worked on the Expedition in the past. Does this indicate I may have a connector problem with the connector? I plan to go to Autozone and see if they can read any codes tomorrow. Is the DTC fused or something? THANKS for any ideas.
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Thanks for the quick reply. You are correct, hte fuse was burnt. I swapped out the fues and I can now read the code. I have a miss fire on cylinder #4. I had this problen in the past and cleared it by changing out the COP boots. I hope it is that cheep this time. Thanks again.
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Well its back. Should I just change the COP and plug on cylinder #4, or should I do all 8 COP's nad plugs? THANKS again.
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Have to given thought as to a possibly bad injector? Your best bet to avoid spending for wrong parts is to swap the COP, plug, and injector, one each to another cylinder (each to a different cylinder). When the misfire code moves from #4 to one of the other cylinders, you've found the bad component. Make sure you write down which of the three components went to which cylinder.
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I would not switch all of them around. IMO, #4 Coil is the hardest one to get to, but I would switch #3 and #4. Also, I would never change just 1 plug on my Expy. If you are anywhere near 100,000 miles, I would change all of the plugs. Then, if you really wanted to, you could switch the boots around. I use Autolite Double Platinum plugs. I think APP103. They must be DOUBLE PLATINUM or OEM Motorocraft plugs. Also, use dielectric grease inside the boots and on the actual electrical plugin. Be generous!
Use anti-seize on the plug threads and there is a trick to getting the plugs in. Use 2 spark plug sockets. 1 with the rubber insert, 1 without. Place the plug in the socket just enough for the rubber to grip it, then start the threads. Get about 3 turns on it, and then use the socket without the rubber insert to finish the job. I found that doing it this way makes the job easier.
Use anti-seize on the plug threads and there is a trick to getting the plugs in. Use 2 spark plug sockets. 1 with the rubber insert, 1 without. Place the plug in the socket just enough for the rubber to grip it, then start the threads. Get about 3 turns on it, and then use the socket without the rubber insert to finish the job. I found that doing it this way makes the job easier.
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