Coil Pack burned??

[Shephard_boy13]

So my last two fill ups i have noticed my mpgs have gone down drastically. Normally i can get about 255 miles to a full tank, these last fill ups i have only gotten 220 or less before completely empty. I made sure when i filled up and each time i could put in 17.4 gallons...
So i decided to dig into the engine and see if i could find the problem. Upon inspecting i found that the contact point with the spark plug wire to the coil pack was all grey/ash colored and the other two were still nice and gold/shiny. Could this be the culprit? and if so would changing all 3 more then likely solve the issue?

 

[Hesk11dog]

So my last two fill ups i have noticed my mpgs have gone down drastically. Normally i can get about 255 miles to a full tank, these last fill ups i have only gotten 220 or less before completely empty. I made sure when i filled up and each time i could put in 17.4 gallons...
So i decided to dig into the engine and see if i could find the problem. Upon inspecting i found that the contact point with the spark plug wire to the coil pack was all grey/ash colored and the other two were still nice and gold/shiny. Could this be the culprit? and if so would changing all 3 more then likely solve the issue?

do you have a picture of the bad coil? you can also pull all three coils and check the resistance of them to see if it is within spec. use a ohm-meter and check the two prongs where the electrical plug goes and the spark plug spring with the wire-connector pin. not sure of the specs but all three should be the same and if they differ, there is your culprit. could be a bunch of other things as well and since it hasn't thrown a code??? it is hard to narrow it down yet

 

[Shephard_boy13]

do you have a picture of the bad coil? you can also pull all three coils and check the resistance of them to see if it is within spec. use a ohm-meter and check the two prongs where the electrical plug goes and the spark plug spring with the wire-connector pin. not sure of the specs but all three should be the same and if they differ, there is your culprit. could be a bunch of other things as well and since it hasn't thrown a code??? it is hard to narrow it down yet

I can post a pic here in a bit. I'm at work clearing some things up. Also I did a spark plug change about a year and a half ago, so about 10-13k miles ago and the plugs look pretty burned already. I used Denso on all of em. I'll post pics of that too.

 

[gamefreakgc]

DENSO dual-ground plugs right?

Check the resistance (ohms) with a multimeter first per the FSM specs, or if any of them are significantly different than the others. It might have been water or a contaminant that entered the wire somehow as well. A multimeter will cost you about $10 at a cheap hardware store if you don't have one.

At the very least, I think you might be due for new spark plug wires since the one seems to be corroded. You could measure the resistance on each wire as well (one prong at each end) but chances are that ash colored one is bad.

 

[Hesk11dog]

I can post a pic here in a bit. I'm at work clearing some things up. Also I did a spark plug change about a year and a half ago, so about 10-13k miles ago and the plugs look pretty burned already. I used Denso on all of em. I'll post pics of that too.

Second on the double ground denso or NGK plugs!!!normally when something changes that quick, from one tank to the other, you always want to think electrical but this problem can come from lots of different components. check the vacuum lines for noticeable tearing. Have you cleaned the MAF or throttle body in awhile? could be running lean or rich depending on the plug color.

 

[Shephard_boy13]

DENSO dual-ground plugs right?

Check the resistance (ohms) with a multimeter first per the FSM specs, or if any of them are significantly different than the others. It might have been water or a contaminant that entered the wire somehow as well. A multimeter will cost you about $10 at a cheap hardware store if you don't have one.

At the very least, I think you might be due for new spark plug wires since the one seems to be corroded. You could measure the resistance on each wire as well (one prong at each end) but chances are that ash colored one is bad.

Yes they are Denso dual ground, same one as manual calls for.
I bought the blue ngk spark plug wires last time I changed the plugs but didn't use since my wires looked good. Didn't have signs of carbon tracing and were firing just fine. Was thinking about putting them on today.

 

[Shephard_boy13]

Second on the double ground denso or NGK plugs!!!normally when something changes that quick, from one tank to the other, you always want to think electrical but this problem can come from lots of different components. check the vacuum lines for noticeable tearing. Have you cleaned the MAF or throttle body in awhile? could be running lean or rich depending on the plug color.

I cleaned both of these about a year or so ago when I changed plugs. I could look at em again to make sure though...good thinking ��

 

[Shephard_boy13]

So my last two fill ups i have noticed my mpgs have gone down drastically. Normally i can get about 255 miles to a full tank, these last fill ups i have only gotten 220 or less before completely empty. I made sure when i filled up and each time i could put in 17.4 gallons...
So i decided to dig into the engine and see if i could find the problem. Upon inspecting i found that the contact point with the spark plug wire to the coil pack was all grey/ash colored and the other two were still nice and gold/shiny. Could this be the culprit? and if so would changing all 3 more then likely solve the issue?

so here is the burned ignition coil