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Old 02-16-2018, 03:40 PM   #1
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Default P0303 & P0316 Codes?

Cylinder misfire codes. Coil? Spark plug?
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Old 02-16-2018, 03:56 PM   #2
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year make model and engine is helpful. some sort of ford i assume?
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Old 02-16-2018, 04:00 PM   #3
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2004 Mercury Sable DOHC 3.0
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Old 02-16-2018, 04:07 PM   #4
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more than likely a coil. when were plugs done last? cyl 3 is on the firewall bank, which means pulling the intake. so i'd do plugs and 3 coils, since cyl1 and 2 coils are probably near failing too.
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Old 02-17-2018, 02:50 PM   #5
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Thanks. The car is up for sale for $2,200 so I want to fix the misfire but don't want to spend a lot on it. I ordered one coil and plug. New owner can change them all if they want.

Looking at vids on youtube it looks like, instead of pulling the intake, you can pull off the wiper motor cover (or whatever it's called) which is 4 clips and 3 bolts. This gives enough access to get to the back plugs.
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Old 02-27-2018, 02:11 PM   #6
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UPDATE: I pulled off the wiper cover and tray and could access the bolt... But I couldn't get a wrench on it. If I had one of the flexible socket extensions, maybe. Instead, I removed the air cleaner assembly and then took out the intake bolts. This let me move the intake a couple inches (leaving the vacuum lines attached) which, combined with the removed wiper cover and tray, was enough to get a socket in there.

Took an hour to get to the bolt and 5 mins. to replace the coil and plug (old plug was fine). Reassembled, cleared the codes, test drove and all is good.

Thanks for the advice.
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