99 Windstar ticking

[12Ounce]

Good news! Please try to keep rainstorms out of your engine internals, hereafter. (LOL)

[SlimJimRD]

Well the noise has not come back, thanks 12Ounce.
Now the problem is misfire. Ran B -12 thru the gas tank and the engine seemed to have misfire, then went away after a couple hour trip. It is now back and has CEL showing misfire on cylinder 3 and 5. I replaced the plugs and wire about 33,000 miles ago when changing the isolator bolts. Should I try another injector treatment, change all the plugs and/or wires? Coil, can it be checked?
Just not sure how to diagnose this issue.
Steve

[12Ounce]

Since #3 and #5 are NOT on the same coil in the pack, it makes me guess something other than the pack is involved. Just the same, I would remove the pack ... clean and inspect it ... remove the plugs and cables and give everything a close check ... looking for high voltage tracks, etc.

Did you ever do a compression test?

[SlimJimRD]

I never did the compression test?
Should I as I found my old gauge that you just hold in the cylinder.

[serge_saati]

To do the compression test, open the throttle body and rotate your engine. It's a good idea to test these 2 cylinders.

When you remove the plug, check if there's oil deposit on it. If it's the case, don't replace the plug, but find the cause of the oil presence.

[12Ounce]

That type gauge works ... but it is more difficult and usually requires a helper. I think screw-in gauges are part of AutoZones loaner-tool program ... but don't hold me to that. I bought mine for less than $30.

[SlimJimRD]

Do I need to rotate the engine by hand or can I use the starter when doing the compression test?

[serge_saati]

yes, you need to rotate it by hand, with a breaker bar.

[12Ounce]

I would initially turn it by hand after the plugs are out ... just to make sure its free. But I always use the starter for compression testing. Crank it 'til the gauge needle peaks out.

BTW, don't try the test unless all plugs are out ... too much load on the starter.

[serge_saati]

Ok, you can use the starter. I recommend you also to disable the fuel pump, and also that the engine is hot when you do the test.

Pressure should be between 100-150 psi.

[SlimJimRD]

So should I just pull fuse 5 under the hood to disable the fuel pump before testing?

[serge_saati]

exactly

[serge_saati]

Don't forget to check how the plugs are connected before disconnect them.

[SlimJimRD]

Finally got around to test the cylinders.
Here is what I have for compression which I think is okay.
Cylinder 1 - 3
140 120 120
Cylinder 4 - 6
140 135 135
I did not see and high voltage tracks on the wires.
Here is a picture of the plugs which I think all look okay.
Any thoughts on what else to try and I will try and go clean the coil pack now.

[SlimJimRD]

So I took the coil out and one of the corners is cracked on the black plastic, closest to coil #6. Should I go ahead and replace it?