I have a 2004 edge extended cab. 3.0. 20 gallon tank. 255 tires. Still stock tires besides the 255's. I havent been getting more than like 15 to 16 mpg even on the highway. The truck felt like it had more power when I first bought it at 21000 miles about a year ago. I use to be able to spin the stock 235 tires when I bought it. I just put the 255's on about 500 miles ago. Even before that it seemed to have have less power when I had the 235's. Anyone have any ideas? I put new plugs in. No new wires but I wouldnt think that would affect it like that. I would definately expect more mpg's than I am getting. Any ideas to restore lost power. I tried seafoam and cleaning the maf sensor. I am out of ideas. Please help!!!!

 

so its a 3.0L, only K&N drop in, low miles??, small tires?, 2wd????

hmm something is wrong.. AUTO or stick??

 

auto with 4.10's. But I wouldnt expect mpg's like this. Seems like a loss of poewer somewhere. I even pulled the stock muffler and put on a thrush turbo I think and cleared out the third cat under the truck after the oxygen sensors. Like I said seemed to have more power when I first bought it used with 21000 miles. Hasent been the same since. 2wd

 

I have the same truck you do and with 32s I'm getting 17 city and up to 22 highway. Did you check the gapping on the plugs when you installed them?

 

You have a stock v6 not a full race v6. Your engine needs back pressure and losing the cat may have killed your low end power.

 

I dont think you have to gap plugs on newer rangers.. i know my 4.0 someone said they didnt need to be gapped.. plus i dont think it could be plugs just doing that.. any idle issues?? any engine noises??

 

Yeah idk, it should throw a code if he got a bad batch of plugs.

 

yeah he has a point about losing cats.. hmm swap to magnaflow high flows and magnaflow mufflers.. you get what you pay for.. that muffler could be hurting you too.

 

Theres no point to swap to magnaflow cats on a 3.0, thats a waste of money.

To the OP are you still on the stock fuel filter?

 

Hmm well losing a cat isnt always good though either.. hmm could be fuel.. could be a dirty MAF.. could be that o2 reading not enough pressure.

 

Yeah there's a good bit of stuff to check. I would spray your MAF with some cleaner first thing, the K&N have a possibility to gum that up.

 

Yeah K&N kills MAFs hahah..

 

Don't start that crap in this thread

 

Hahaha i know i know.. i am just sa ying.. I run one.. never had an issue.. parents ran one and needed a new MAF on an 05 suburban..

just dont over oil i know i know..

sorry to thread jack.

 

Most plugs come pregapped for your engine now anyhow.

 

Cleaned the maf 3 times since the install. About 20,000 miles ago. Same mileage before and after the muffler install. All was dne in the attempt to get better flow and better mpg. Its been this way since about 5000 or so after buying it. plugs are gapped good. They are standard ngk or soething plugs. I dont think there is a need to buy the rediclously expensive plugs for an engine like this. It sounded better after the cat mod. And a very small notice in power off the line. thought putting the bigger tires would help with highway miles but possibly hurt it. Desnt seem right to me. Could be wrong. Unplugged power for more than a half hour to reset the computer but still no help. idk?????

 

I know but we don't need certain member coming in here and starting arguments. I was just saying that in case he did over oil it, its something to check.

 

Were you getting better mileage before you changed the plugs?

 

No. It was just a slow downward spiral since I bought it. I dont know if there is something special they do before selling the truck. Bought it from a dealer. I remeber when I got home for the first couple of weeks and being able to spin the stock tires. 235's and 15" rims. On dry ground. After that it just seemed sluggish. That is when I began the mods. Hasnt got worse since. Just not better.

 

compresssion test?


any codes being thrown?

 

I couldn't spin my stock 235s if that makes a differnece

 

i can spin my 31's all the way thru 1st and 2nd..

 

You have a stick and a 4.0 lol just a little advantage

 

i dont know what you are talking about

hehe.. okay okay... maybe.

 

No idle problems. Just seems to be a lack of power. Now am glad I didnt go any bigger. I want to in the future but now I am a little worried about it. U think a compression test so soon. I have had a synthetic blend ever since I have owned the truck.