tshaw024

Just got a 2004 Cayenne S. Not getting great gas mileage, going to change out the spark plugs and spark plug wires, and put in two new K&N air filters. Hoping to pick up 2-3 MPG. I have the plugs and air filters but I bought the wrong spark plug wires. Can anyone tell me what size/brand I should get? Nobody seems to know what fits where I live. Thanks...

911SLOW

For the 2004 M48.00 engine you need 8 x FGR6KQE spark plugs.

Porsche part number is 999 170 218 90, but I am sure that you can find them cheaper.

Welcome to RL.

Slow Guy

Are no plug wires on the Cayenne, they're coil packs that connect directly to the plugs.

You may want to replace the coil packs (6 or 8) at the same time you replace the spark plugs, call Sunset in OR, Hennessey in Atlanta or Suncoast in FL to get the best price on the latest and greatest versions of the coil packs (don't know the latest vs. off hand).

Plenty of threads on the subject, use the search feature.

John, love the avatar, beautiful!

911SLOW

Bill thank you, and thank you because by reading the post quickly I thought he wanted the spark plug part numbers..


Coils according to the last PET update 270/27 are still the 948 602 104 05 however I believe that some newer versions exist ending with .07 to .10.

Dennis C

A 2-3 MPG increase in mileage would be nice... maybe you could get it up to 14 MPG!

Slow Guy

I think I remember seeing .07 a while ago, I think mine are .05's but they were replaced some 2 yrs ago.

Slow Guy

I get just under 16 but I usually drive 80 - 85 on the hi-way. If I wore a lighter weight shoe I bet I could do better....

cordsig79

i was hearing and K&N are not recommended any more because they allow to much oil and debris to pass directly into the engine aside from a traditional paper filter......

s4for5

Oiled air filters can ruin MAF sensors
Some will say otherwise but any oil that gets on the sensor is bad news.
The oem filters do a fine job and aftermarket filters without air box changes do nothing imo

Slow Guy

Agree with this. Stick with OEM dry paper filters.

Km1.8t

My new coils were .08. I replaced them just a few weeks ago and all is well.

Slow Guy

Thanks, good to know.

tshaw024

Thanks for all the responses. I realized after more research there were no wires, just coils. Trying to decide whether to buy the coils as well and have both changed, or just not do it at all. I tried to go in and change the plugs myself but found I can't get at half the places I need to. Would cost about $200 just to have the plugs changed and I don't know if it's worth it... Any other ideas of how I might increase mileage a bit? Would plugs/coils make a noticeable difference?

Slow Guy

There is zero extra effort to replace the coil packs in addition to replacing the plugs, you have to remove the coil packs to get to the plugs. IMHO $200 is a very reasonable shop charge for replacing both plugs and coils. As long as you weren't paying full dealer price for the coil packs I would give very serious consideration to doing both at the same time. The coil packs are going to fail, sooner or later.

Would I pay $200 for someone else to do it? No, unless time were an issue for me. But I do the majority of my own work on all my cars and have the tools and garage space to do it. But I believe $200 is reasonable for a shop charge.