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Old 05-21-2014, 13:36   #1 (permalink)
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'03 Lincoln Aviator Cylinder 7 Misfire

I've had this intermittent misfire for the past couple months, mostly only at idle . It's a Cylinder 7 Misfire. To diagnose I've put all new plugs in, swapped the cylinder 7 coil pack with cylinder 5, also reinstalled the old fuel injectors on the left bank cylinder. Still have cylinder 7 misfire. My next step is to do a pressure test.

After some research online, I'm scared that I've found the problem noted in this tsb: http://ww2.justanswer.com/uploads/ke...sb06-05-13.pdf

Been reading around different posts scattered across the web and many have posted it's a common issue.

If it is in fact a leak through the exhaust valve and I do have to replace the cylinder head, can I possibly do it in my garage at home without taking the engine out?

My main concern is the timing chain. I don't want to mess the timing up. I've been reading through Alldata and ChiltonDiy and looks like it's a big job.
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Old 05-21-2014, 14:01   #2 (permalink)
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Re: '03 Lincoln Aviator Cylinder 7 Misfire

Do a compression test to be sure that's what it is. It is a big job and you should need special tools to be sure to get it right. If you have access to Alldata, you can see what's involved.
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Old 05-21-2014, 15:41   #3 (permalink)
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Re: '03 Lincoln Aviator Cylinder 7 Misfire

Quote:
Originally Posted by Bert View Post
Do a compression test to be sure that's what it is. It is a big job and you should need special tools to be sure to get it right. If you have access to Alldata, you can see what's involved.
Going to do the compression test tomorrow.

I have access to alldata and Chiltondiy.com. On alldata it doesn't have instructions just for the cylinder head, its in the complete engine disassembly. Chilton has replacement instructions for the cylinder head but not as visual (not many images), and I'm afraid of messing up the timing.

So far it's looking like I'm going to take it into a shop :(.

Autozone has reman cylinder heads starting at $550 going to $800, rockauto has it at $750 and its ~$1,500 from the ddealer. Would I need fine going with the $550 one from amazon?

http://m.autozone.com/autozone-mobil...znuv?id=875572
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Old 05-21-2014, 17:33   #4 (permalink)
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Re: '03 Lincoln Aviator Cylinder 7 Misfire

You might get the info you need here. http://www.autozone.com/autozone/rep...96b43f802e77b5

I don't know about the cylinder head quality from anywhere but Ford. Why not have yours rebuilt if it is a valve problem?
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Old 05-21-2014, 19:40   #5 (permalink)
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Re: '03 Lincoln Aviator Cylinder 7 Misfire

Agree with ^^^. Don't want an inferior cylinder head.


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