So, I am at around 81,000 miles on my 03 G35 coupe(auto), and I was wondering what I can do to gain whatever power I may have through out the years. I did a search but engine cleaning is a bit vague of a term. Should I be looking at getting my engine like ported and polished? I just want to try to get back the power I noticeably feel being rob because of the miles. Thanks.

 

top 100 faqs..look at top of page.. read plz thanks.

post if u still require help.

 

Maybe change the spark plugs, look for leaks, change hoses, sensors, oil change, etc, injectors or injector cleaner, etc. stuff like that.

 

How do you know you are loosing power?
How long have you owned the car?
How serious are you about achieving more power?
"Ported&polished"?You readin some old hot rod mags?
If you have the budget,take it in to a tuner in your area.
Go from there.

 

Boost.

 

port and polish the engine, problem solved...lulz

 

this....the whole engine...make sure you port the sleeves too!!!!.....

 

I guess porting then is out of the question. I have regular oil changes, and been using injector cleaners. Have owned the car since I got it in 03 new. Spark plugs are 3 years old, and so is the air filter, thought I do have plans of getting a new intake. I don't want to go boot, nor do I really want to go extreme modding, not to mention my whole suspension needs a reworking. What kind of engine cleaning can I do, beside the use of the aforementioned injector cleaners? Thankies.

 

How about new spark plugs and air filter to start with?

 

Well I did mention I will be getting a new air filter and the spark plugs seem to be in fairly good shape. So, not to sure what else to do.

 

A more serious answer would be answer air filter spark plugs (iridium) and seafoam!!!!!!

 

what kind of power loss?
you have a code?
you getting used to car and feel its slow now?

 

What is seafoam? As for power loss itself, I can feel the car is slower than it use to be, specially when I accelerate on freeway on ramp and other day to day driving and stuff.

 

Seafoam is like an all-purpose cleaner for your engine. You can put it in your oil and gas tank.

Put it in your Oil and run your car for about 50 miles and do an oil change. Put some in your gas (read the directions) and you can put it in your vacuum too.

Also look into replacing your rear tires if they are anywhere decently low on tread as that can have an effect on your Butt-Dyno as well..

 

I think you'll find you need to do a full service, so many people completely disregard this for getting cars back to good running condition again.

 

I would but my dealer wants to charge me close to 425 for a full 75,000+ mile service, which isn't worth it to me. I think I am going to go with upgrading my intake, getting my intake plenum clean and ported, and use the seafoam treatment. Unless, I am missing something?

 

Yes.. you havent stated what the lost power is...?
Have u tried simply resetting the ecu?

Most 99% of the time, its a combination of adding totally pointless items like exhaust and intakes, running lean conditions, an ecu that's struggling to try to correct the AFRs, and time/ perception..you can get very used to your car very quickly.. take a break, youl see its still quite fast.. and also note that the car itself is actually not very quick off the line.. if you compare your car to others, you wont be happy.


Try this as a port and polish is NOT what u want on a car that requires specific air patterns Inside the I take...smoother aint always better and whos doing that work btw? very expensive)

try driving another car for two weeks..do an ecu reset on your car... then drive your car again..bet you it runs juuust fine.

Aside from the most basic maintenance, its always one or a combination of these two things...its in your head...or you added breathing parts and are running a stock unflashed ecu w factory targets in it...end of search, end of story..
( unless u have ebay taillights lol.. that's another mystery)

 

As maybe a far fetched idea, you may want to take a look at your MAF sensor. If, for whatever reason, it's dirty it does have a tendency to reduce power. If you've been running stock filters and regularly changing them, then this may not be the issue.

 

So, to be clear if I go with an upgrade intake(or at least filter) and plenum space, do I need to do a retune or should I be fine with an ECU reset?

 

You will lean.out w those items yes..you may gain 4 HP at like 5000rpms but youl lose low end and the car will simply feel slower.. it will sound great but that's it. I truly wish it wasn't so..but it is.. was there myself.

Stock air box..even non k/n filter...best way yo go until you can tune it up..