Misfire under load.

Yes, get a wifi OBDII reader and download the OBD Fusion app or similar type app... Mine wouldn't throw CEL codes either but with the app you will be able to see the misfires on each cylinder.

If it is a coil, get motorcraft. My mechanic put an off brand and it didn't fix it so I was puzzled for days after until I went ahead and bought and OEM coil...

TxOutlaw said:

Yes, get a wifi OBDii reader and download the OBD Fusion app or similar type app... Mine wouldn't throw CEL codes either but with the app you will be able to see the misfires on each cylinder.

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Hey TxOutlaw. I have the Bluedriver OBD2 scanner and I can see the mode 6 data for each cylinder. None of them are showing misfires. I tried it running for 15 minutes with no change, Then I took in for a 20 min drive, rescanned a few times, no misfires reported.

I am sorry, I am misreading your post... OK. If the coil swap made stuff worse, maybe buy one coil and plug and move it around until the issue resolves. I am certain its a coil or plug.

TxOutlaw said:

I am sorry, I am misreading your post... OK. If the coil swap made stuff worse, maybe buy one coil and plug and move it around until the issue resolves. I am certain its a coil or plug.

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Just changed them. They are all new plugs and coils. I metered out the resistance on all my original coils and they were exactly the same resistance, so I will try to swap one of those at some point this week to see if that makes it clear up or not.

Sounds like it. But if it makes a difference, best place to smoke a motor is the big hose to the brake booster. If your rpm dropped by monkeying around with coils, I think your getting warm. We always say to change the boots from coil to plugs. It might be just a bad coil boot connection. Try new boots, and some dielectric grease on both ends.

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1955moose said:

Sounds like it. But if it makes a difference, best place to smoke a motor is the big hose to the brake booster. If your rpm dropped by monkeying around with coils, I think your getting warm. We always say to change the boots from coil to plugs. It might be just a bad coil boot connection. Try new boots, and some dielectric grease on both ends.

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1955moose, thanks for the input. When I installed the new accel coils they all had new boots and contacts inside the boot. I also used dielectric on the boot to plug end.

Have you tried a Motorcraft coil in the place of the Chinese one?

If you cannot read any miss in the motor, could it be a valve or head gasket problem?

Compression test next.

If things got worse by swapping coils, it's gotta be a connection. If things didn't improve, which obviously they didn't, you can rule out the spark plugs. If it was #3 plug, your misfire code would still be #3. What's confusing me is your misfire gets worse when moving coils around. Kinda crazy, but spray out the connections on the plug going to the coils. You didn't say if code is moving, or staying at #3? What I would try next is just for the heck of it, swap in one or 2 of the old boots to the new Accel coils. If your ohm readings are close, you should be fine, but who knows. If you had a compression problem it would run crappy. You haven't mentioned that, just the low idle misfires.

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Clogged cats?

He never mentioned a loss of power. Cats usually will affect acceleration. It's possible I guess. Hell, didn't we have a guy this week devin 97, that changed out his flexplate for a miss! Small misses are the toughest to find, and fix.

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