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Old 08-25-2008, 21:59   #1 (permalink)
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Smile Missfiring on cylinder 4, 7 and cylinder 1 is reading to lean!!

I just bought this awesome expidtion an hour agoo for just 1000 bucks 'LUCKY me" knowing it had some issues in the engine. I have a scanner and came out with 3 codes which I will be posting later. But it showed my that cylinder 4, 7 r missfiring n cylinder 1 is to lean. The car also needs a new catalitic converter since I believe it has a hole in it. After a couple of research it seems 2 me that the catalitic converted may b the possible problem for this codes. N if not I will hav 2 begging by swapping coil until I find the problem. But first I will like 2 ask anyone if anybody has a link 2 a web site that has the repair manual for the expedition. I will truly appreciated ur help. Thank 4 the help every1 n I will post more info as I beggin repairing it!!!

rpmhigh
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Old 08-29-2008, 20:14   #2 (permalink)
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Re: Missfiring on cylinder 4, 7 and cylinder 1 is reading to lean!!

First off the cat converter is never the CAUSE of a problem. It fails because of a problem upstream. When an engine misfires, all the unburned fuel goes into the cat. The cat is designed to handle a certain amount of unburned fuel. But when it is too much, the reaction really heats up -- to over 2,500 degrees. That melts the metals in the cat. These coils are known for misfire failures. I know techs that have had to replace 4 or 5 coils on a single vehicle to get it running right. First eliminate the misfires. Then take on the cat. Not the reverse.

As for the manual, be a sport and drop $10 on a 1-week subscription to www.eautorepair.com
It's the only way to get reliable information. Or, if you want another online source, try ALLDATA - OEM Automotive Repair Information and Technical Service Bulletins.
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