04 lincoln Aviator misfire #8

[shospeed]

hello guys i really ran into a wall with this car and would like to get a second opinion about this issue.

it keeps giving me the CEL code of "misfire #8" I've checked the coil and spark plug by removing them and putting them in the #5 piston and the code persist misfire #8.
There is no oil on the plugs so valve cover gaskets are fine.
Wen I first saw this code I was sure it was going to be a bad coil but now I don't know.
The misfire occurs wen its at idle speeds around 600 rpms.
I've also replaced the cam sensor sense it was one of the original codes.

 

[J]

It could also be an injector, a bad valve, a bad spark plug, or worse, a bad cylinder/piston. See my thread here....I went through the same steps, ended up my piston is jacked up.

Kinda intermixed in this thread.
http://www.lincolnsofdistinction.org/vbulletin/showthread.php?t=31485&page=2

Coils
http://www.lincolnsofdistinction.org/vbulletin/showthread.php?t=32167

 

[shospeed]

Tomorrow I will test the compression and the injector should be coming in.
What's the compression on this motor?

 

[AnthraxBird]

Did you erase the p0308 after you switched?

 

[shospeed]

Yeah. And the code came back

 

[AnthraxBird]

Sounds like an injector. It could also be an intake leak also... I would do the compression test first, and also try a leakdown. Make sure you go WOT on the compression test.

 

[J]

Anything above 140-150 is sufficient. Make sure you swap the coil, boot, AND plug to the different cylinders. You can also swap injectors very easily without replacing parts. I've never had a bad injector throw a check engine code FYI.

Question: Is this a dead miss (ALWAYS misses) or is it intermittent like mine? If its a dead miss it could also be a bad wire, a chipped crank shaft pickup or something more "mechanical" vs electrical.

 

[AnthraxBird]

+1 on what J says. Also, does the engine light flash at you sometimes?

 

[J]

Flashing means it's misfiring right NOW.

 

[AnthraxBird]

Lol

 

[shospeed]

The CEL light flashes wen the misfire is happening.
It only does the misfire wen the rpm's come under 1,000

 

[J]

Flashing means it's misfiring right NOW.

The CEL light flashes wen the misfire is happening.

Yah, what J said.

 

[shospeed]

Well compression is good, coil is good, and I put a new injector after still seeing the same results. I checked the injector connector with a noidlight I noticed that the injector 8 had no power pedioticly. So now I'm thinking maybe a bad computer.
Does any body have the wiring diagram for the injectors for this 04 aviator?
I can't find it on my "on demand".

 

[budpytko]

Have you checked on Auto Zone's web site for your wiring schematic? They have lots of help with on-line manuals. You have to join the site, but it's free .

 

[shospeed]

I found the diagram on my on demand. I wasn't looking on the right spot. Next is check the wiring for the injector #8 to see if it's a faulty wire or computer.