Loss of fuel mileage after tuneup?

[AnthonySSEi]

i changed plugs and wires on my 01 SSEi and put in new ACdelco iridiums with Taylor 8.2 wires and i lost fuel
economy on the highway, could the wires be the culprit or maybe the plugs?

[Roadtech195]

are all your plugs gapped at .060 and are they the 41-101?
Are all the wires on tight?

[AnthonySSEi]

ya all at .60 and i jus checked if they were tight and they were, it doesnt make any sense.

[TenGHz]

How much loss did you get??

[AnthonySSEi]

normaly i get 27 to 28 runnin 78-80mph , now its down to 24mpg at the same speed, same highway, same tire pressure and fuel grade 93.

[Roadtech195]

Is the fuel you are using blended with ethanol?

[AnthonySSEi]

ya actualy it was , the 7 11 station contains less then 10% ethanol, could that be it?

[TenGHz]

If you don't normally use corn, that could very well be the difference.

[AnthonySSEi]

i hope thats what it is cus i dont feel like having to pull the plugs again until the next tune-up, those back plugs arent to fun to do.

[TampaSSeI95]

yea if you did not use the corn before then thats your problem. i was tryin to stay away from the corn but now its everywhere i go

[00Beast]

You used Taylor wires? Be prepared to replace them in 6-8 mos.

[wjcollier07]

That was not a very good decision for wires. Why didn't you ask here for the best suggested replacements beforehand?

Did you unplug your battery also after the tuneup? Its a longshot, but sometimes after the PCM has gotten used to a certain timing for old plugs and wires, it might try to lean towards it. Don't give it the chance..unplug the car overnight...doesn't sound right you'd lose that much efficiency just from that.

[AnthonySSEi]

ya i guess that was kinda stupid not to ask about the best wires possible, especialy since thats what ive used this club for since i started so i can see whats the best thing for our cars, what would u recommend i replace them with.

[Roadtech195]

Stock wires are fine or go to NAPA and get a set of Belden wires.

[00Beast]

Or MSD, if you want the best, and something that will last. Use the Taylors till they go, you spent money on them, might as well use them.

[AnthonySSEi]

i disconnected the batt but havent taken it on the highway to see if it helped, but how much to the MSD wires run price wise and were can i find them for our cars.

[00Beast]

Jegs; These. I believe these are correct, other wise, which ones are right?

[AnthonySSEi]

will i see any performance gains with the msd wires?

[bonnevillain]

no. wires will not give you more performance unless they were bad in the first place. Even then they will just be restoring lost power

[00Beast]

But they look better, last longer and are better than the stock replacements. And for not much more money, as well