Hello every one,, I have maxima 2003 v6. 3L. I heat it because it cost me thousands of dollars but no one know how to fix it .

Poor and no acceleration ,,the total horse power is 65 by the check tool.. It stops when climb a hill and all cars pass me on the rood and i can't catch them . The max speed is 170 km and takes over 1minutes to gets that speed,,, There is no strange sounds of the engine but the sound look low than other cars.. No over heating ,,,the air that come out throuth the exhaust is very low .. No smoke from the exhaust...


and there is like shocks when shifting ,,with knowing I had been change the trans but the problem still with the new one


what i did:
change the trans ,,,sparks,,,oils,,,clean all sensors,,,,check the computer no codes ,,,,new battery,,,,new generator,,,,clean injectors ,,,,new fuel pump,,,,new filter of air and fuel and oil ,,remove the cat conventor ,,,put clean liquid in the tank,,,check all the Fuse ,,,,

I didn't know what the problem !!!

I wish from you help me ,,I still 4 years on this problem

 

are you sure there are no codes? you replaced a lot of parts to have no codes. have you tried a working MAF sensor.

 

Funny post.

 

Yes There are no codes ,,,, the car about to shut down After I unplug the sensor then gets normal when plug it agine

 

I've got one word for you: MAF

 

Whats the fun?

 

But it runs good ,,,also i cleaned it

 

yeah...idle and part throttle may be fine. however, when you accelerate and let in more air and the MAF is not metering that air (cause it's defective) then you will experience most of the issues you are experiencing.

 

I bought new one ,,,,the result the same

 

the cars are sensitive to the brand of MAF. You will need to buy one from the dealership in your country.

 

Yeah sorry about the car but i'll have a quart of chicken chow mein, one egg roll and a pint of sweet and sour soup. Thanks.

 

oem? and why didn't you list this in post #1?

 

Or clogged precats

 

I removed the cat

 

you dream of clogged cats in your sleep

 

There are three of them.

 

That would be a nightmare.

 

when my idle circuit died i didn't have any codes nor any burned spots on the ECU, the old man i sent it off to said it did have damaged idle circuit and she's been idling great ever since.

Makes me wonder if you don't have jacked up ECU or TCU, or a wiring problem or broken ground strap or something along those lines.

Dad and I had a motorcycle in the shop once that ran great but, couldn't drive under it's own power unless down hill and even then barley, turns out it actually had no compression.

5th gen has 3 or 4 cats.

 

Are you sure??

I went to the workshop and i told him to remove the cat and removed one cat

 

yes there are 3 dude

 

I replaced the whole exhaust and try the car but the same

 

this is tough, you have done alot, and there are many variables to narrow down your issue.
have u answered the pending question though

Is the NEW MAF you put on the car OEM ? or aftermarket

 

2003 is 3.5L. 2000-2001 is 3.0L which one do you have.

 

Sorry ,,,2001

 

oem

 

being an 01 this is probably his issue.

 

Not Nice.

 

1 main cat and two smaller precats that are known to be more of an issue that the main cat.

 

has the battery been replaced with a new one? if yes has that new battery been stress tested? my car lost some horse power when the alternator died on the highway. this could be electrical. has compression test been done yet? has the timing been checked? if it's off a tooth valve timing could be dumping compression above a certain rpm.

 

agreed, Just buy headers since those will completely get rid of your precats. Sorry to hear man, hate problems like this where you end up literally remaking the whole car brand new through trial and error. To be honest, at this point just take it to the dealership and have them diagnose, it might be $$$ but its better than blindly spending $$$ on replacing every part that probably doesn't need replacement.

 

Dealers know no more than he does. They're all idiots and scam artists.

 

agreed, that's why i threw it out as a last resort, just get it inspected, don't have to get the actual work done from them

 

Hey guys..

The original engine 3000cc is replaced by 2000cc VQ20 ....I saw that driven on my engine ...

(The old owner mybe changed the engine)
So my question: Is this the reason of low power in my car?

 

if you are missing 1000cc then yes...it will have less power.

 

I saw nissan cefiro 2.0L acceleration on YouTube it was like my aceleration 13 sec... Was slow