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sweaty 07-25-2013 07:59 PM

Unsuccessfully Changed Spark Plugs
I have a 2004 Ford Taurus Wagon with DOHC engine. I just changed all 6 plugs, put in new coils in the back, and replaced the 6 gaskets under the intake manifold.

After reassembling everything, I started it up. It idled smoothly for a minute and then it made unusual sounds, then sounded like a cylinder was cutting out.

What do I do now?

ukrkoz 07-25-2013 09:49 PM

Check all connections? Something's loose...

caveeagle 07-25-2013 09:57 PM

is this a coil-on-plug motor?

Why do you suspect the plug change is your problem? The pugs, themselves are pretty hard to screw up.

cjm94 07-25-2013 10:19 PM

It's possible something went down the intake when you had the plenum off. Figure out what cyl is missing and do a compression test.

sweaty 07-26-2013 04:39 AM

It is a coil-on-plug motor. I was careful to connect everything back. I did notice that a little plastic clip that secures a connection to one of the back coils broke off. It was very brittle. I taped it with electrical tape.

Is it also possible that a coil is not secured to a plug? I guess anything is possible. I'm trying to fix this myself as a garage want hundreds of $ to take off the intake manifold to get at the back plugs.

sweaty 07-26-2013 05:43 AM

I started it up this morning. It sounded like all 6 cylinders were running. It idled faster, then slower, faster, slower, died out.

cjm94 07-26-2013 06:53 AM

May have knocked off a vacuum hose. Listen for a loud sucking noise when it's running

caveeagle 07-26-2013 09:08 AM


Originally Posted by cjm94 (Post 1221118)
May have knocked off a vacuum hose. Listen for a loud sucking noise when it's running

If you suspect a vacum leak (I would), you can also spray some carb cleaner around. A vacum leak should suck up the carb spray (engine running) and should level off the rpm enough to make the leak obvious.

digitalplumber 07-26-2013 09:13 AM

Does this car have an IAC valve?

sweaty 07-26-2013 12:57 PM

I took off the intake manifold again to make sure everything is tight. I also used the correct bolt tightening sequence. After spraying card cleaner, I think there a vacuum leak at the EGR valve. But I don't know how to fix it.

caveeagle 07-26-2013 01:27 PM

can you post a pic of your EGR valve?

Some have a gasket at the base where they bolt on.

Sometimes the EGR valve get clogged up with carbon build-up. You can clean them off with brake cleaner that sometimes helps.

If you truly have a vac leak, you need to resolve that first.

ukrkoz 07-27-2013 05:39 PM

1. you DID have a poor connection on one of the ignition coils. One that you taped.
2. If you replaced all six intake gaskets, chances are, you have air leak at one of them.
- old gasket material may have not been completely removed, causing air leak
- gasket was damaged during installation
- sealant was not applied
- an air line was broken or loosened
Are you using straw to shoot solvent at the engine, or wide spray? Use straw, as wide spray gives wide area of possible air leak
- it's a job that requires at least several sensors to be disconnected. Are they all connected back and tight?

Jdwilson112 03-29-2014 03:57 PM

Probably stating the obvious but did you verify all of your wires are going back to the correct plug, look up firing sequence if needed and double check. Sometimes it's the easiest things

ukrkoz 03-29-2014 04:47 PM

There is no wires going to plugs. He has ignition coils.

r0ckstarr 04-01-2014 11:30 AM

By any chance, is this misfire causing a check engine light to come on?

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