gapboi210

wow my spelling sux

gapboi210

seems like it would have to be the coil. what about the connection that goes into the coil.. not dirty or cracked?

trf4x4

mine to. Good enough for yotatech.

trf4x4

Nope, I cleaned the connections with that electical spray. I thought maybe a coil when this all started. I swapped 3 and 5 around. I got the same code. #2 and #5 misfire.

gapboi210

then it has to be before the coil i would think. No cracked wires? seems the coil is not getting a constant power.

trf4x4

I'll check the connector out in the morning. I'm guessing the wire is coming out of the wiring harness. I guess I can follow it down as far as I can to see if it minght be broken somewhere along the way. I would think it would be kind of hard to tell though. I'm up for anyhting though. Thanks

trf4x4

I'm wondering of you turn the ignition on if that sends juice through the wires to the coils. Can you test the current that way?

gapboi210

I don't think it will because they get spark by readings from the crank sensor.

trf4x4

Ok. That rules that idea out. Thanks. I guess I'll wait and see what they have to say about it in the morning.

Elton

i would take out the coils and looks them over very good and see if you can see any cracks anywhere

playswithfire

Hey trf4x4:
I would also take a good look at the coil paks, just to make sure they are OK. If you haven't already done so, I would check the primary and secondary resistance of the paks with a simple ohmmeter. (Switching the 3 and 5 paks like you did was good, but this is a more definitive test).

You mentioned cleaning the contacts between the wiring harness and coilpak, but did you also clean the contact area on the pak where the spark plug wire connects? The metal in the area should be shiny. (If it is corroded, it will take more than just spray contact cleaner to clean it up).

You also mentioned installing new NGK plug wires. Your old wires had clips on them that you probably removed and put on the new wires. The clips for coilpaks 3 and 5 are just a little different than the clip for coilpak 1--did you replace the clips correctly?

Finally, when you reinstalled the plugs, wires and coilpaks, did you use enough dielectic grease?

Anyway, these are some of the things that are quick and easy to check. btw, I was knocking my head for several months with misfires--all caused by me not using enough dielectric grease, which resulted in corrosion and poor contact between the coilpaks and the plug wires. Good luck, John

trf4x4

Thanks John, Idid just about everything you mentioned above. I did'nt use any dielectric grease though. All I used was a little antiseize on the plugs. Is the dielectric grease used on all electrical connections? Thanks for the help. Tommy

playswithfire

Well Tommy, I'm just a weekend mechanic at best, but here's what worked for me. On the 3.4 V6, I placed dielectric grease on a total of 9 areas:

• The ends of the plug wires, at the connections to plugs 2, 4 and 6.
• The ends of the plug wires, at the connections to coilpaks 1, 3, and 5.
• On the coilpaks, at their connections to plugs 1, 3, and 5.

For each of the above 9 areas, I used a dab about the size of a pencil eraser, and applied the grease with a plumbing-type flux brush. Some sources say to apply it to the metal contact areas, other sources say to apply only to the areas adjacent to the metal (because it is non-conductive). I placed most of the grease adjacent to the metal, but didn't freak if a little got on the metal contacts.

If anyone knows a better method, chime in, cuz I got alot of conflicting info when I googled for methods to apply the grease. Anyway, its what worked for me, so good luck. John

trf4x4

Ok John, Thanks. I'm fixin to head into town and pick up some of that grease. At this point, I'm up for anything. I'll let you know how it goes. Tommy

yota_krazy

make sure you dont get any of that anti-seize on the electrode of the plug. Also check connector pin fit on the connector to the coil pack, try wiggling around the wires with the truck running and see if you can get it to misfire.

trf4x4

I went yesterday and bought some them $77 wires from the stealership. I figured even though I allready had the NGK wires on it, I go 100% OEM. I'm still getting the same code. I will try to wiggle the connectors and wires in the morning while it's running. Thanks for the imput. I think I'll find it eventualy. I may be broke by that time, but what can i say. I love driving this truck.

Elton

wow $77 dollars take them back

trf4x4

I thought it was pretty steep my self. At this point I'm willing to try anything. As of right now I have a set of Iridium plugs, a set of NGK dual electrode plug, and a set of wires sitting in my garage. I have Denso plugs and OEM wires in the truck right now.

Elton

so this all started when doing the tune up ?

yota_krazy

did you loosen that ground connection on the drivers side of the plenum to get it out of the way? maybe its loose?