after my car reaches 3500 rpm, it loses its power...
before that (800-3500rpm) i get all the power i want but its just
after 3500rpm, the car wont accelerate as fast.....
I thought it was MAF so i cleaned it and it still has the same problem
help? please!
thanks!

 

Do you have an SES light? If so, get the code.

A few more details?

 

I do not have an SES light....if i did i would've find out whats wrong.. thanks though!!!
i have tried to install a short ram but i couldnt find a spot for my temp sensor so i went back with the stock intake... but ever since that, no power after 3500 rpm.... no clue why.

 

Check the MAF..and all the hoses....on my 5th gen i but a lil 15mm filter over my IATS and zip tied it up never had one problem

 

you won't get a specific code for a failing MAF, if you have a fellow .org'er in your neighbor hood trying swapping their known good one into your car and go for a drive just to help confirm if your MAF is failing

 

Zip tie the temp sensor as near to the filter as possible. Is it just dangling in the engine bay now?

Did you get the correct SRI for your application?

 

no i didnt, but oh well. it must be the hose... ill check it out.

 

maf... get cleaner for $7 dollars and try and clean if not call daveB. been there.

 

Who is daveB?

 

http://forums.maxima.org/member.php?u=178

 

Do you have access to a scanner?

I am thinking could also be a problem with your VIAS.

I had pending codes when mine went wonky. I had the same problem as you, gutless in certain areas of the power band, it was the VIAS. I put on a block plate and had all the power back right away.

 

not necessarily. you could have a bad KS and it will not throw an SES light.

 

he has a DE-k motor.they dont make block off plates for the de-k's do they?

i have a feeling his VIAS isnt working anymore and he needs to perform the fix which i think included removing the solenoid and applying silicone in some areas to seal it back up. need to read up on it and find out exactly whats involved.

 

thank you guys!
first of all, whats VIAS and KS?
i bought this car this march and i didnt have this problem until i tried to
install the SRI.... anyways, i do not have a scanner and SES or CEL light does not come on.... If i have a bad KS, how do i make it good? and if i have a problem with VIAS, i do i make THAT better? also, i check for leaks and hoses... but everything looks fine... eh..

 

They don't have block plates for the DEK you're right... Although it could still be the VIAS, the principle is the same on both cars. (3.5, 3.0)

Either way, the solution could be to repair the VIAS if its buggered.

 

http://www.vqpower.com/v2/articles.php?article_id=21

 

I think I may be experiencing the same problem. Car has good power up to 3500, then the power sort of flatlines. GAB helped it a little, but it still does it.

 

to see if your VIAS is working , locate the VIAS solenoid; rev the car manually with the TB.
look under the solenoid;there should be a small bronze lever/rod. if your VIAS is working, when you rev the car past 5k, the small lever should move forward. if it doesnt and just remains stationary, then it means its bad.
to know if you KS (knock sensor) is bad, you'll have to plug a scanner in to see if it throws a code at you.
a bad KS will pull timing from the motor and send it into safe mode , thus robbing HP from the motor.

 

thanks!

 

I have a 95 maxima. 183k,3.0 dohc, 5 speed. i have very little idle rpm and after 2700 rpm it flat lines on take off. i cleaned out my iac valve, problem still there then i checked my air filter that i put in two months ago, dirty as hell. is this the problem.

 

MAF seems to be a common culprit ... apparently you didn't do a bit of searching ..

, nice thread JACK.

 

okay so this seems not to work... grrrrrrr
any more ideas? help! lol

 

The link doesn't work or the method doesn't work?

 

the method doesnt work....

 

So maybe your VIAS is fine? And it's another issue? MAF?

 

i think so too.... im going to clean it to see if maf was the problem....thanks!

 

How do you know if you need the VIAS fix?

 

Also, what's involved in flashing the MAF as I've seen mentioned before here.

 

Clogged exhaust (cats or muffler) can also cause power loss at higher rpms. You can put a vacuum gauge on the engine and as you slowly rev it, if the vacuum starts dropping off quickly, odds are you have a backpressure issue.

 

okay guys! thank you for all your inputs!!!!!
i now have power after 3500 rpm.
how i fixed the problem? i simply clean the MAF with the MAF sensor cleaner ...
now i have all the power in the world....kind of.... lol
anyways, im good now!

 

good to know. funny that the maf can cause that much problems.

 

If your VIAS isn't yet broken on a DE-K, then it will be. Do the fix whether it "needs" it or not. You use JB Weld, not silicone.

A good MAFS cleaning is probably in order, or your MAFS could just be bad.