Hello,

I have been trouble this problem for a while, and could not really find out.
Basic synthom is the car is in limp mode,and it wont pass 4k rpm.
Idle is just fine!
when I drive on highway, the engine ligth is keep blicking!

Checked list.

PCV valve,
no vacume leak,
spark plug


Today, I checked the fuel pressure it won't move.
it just stay around 52.

What is this problem..

clogged cat? or
fuel filter?
fuel pump?

...any comment?

thanks

 

Have you tired hooking up a code reader and pulling error codes?

 

+1.....

 

I did it for 5 times at the nissan dealership!

im only getting multi-misfire...
nothing else.

 

first of all what year? miles? any mods? ok so it missfires past 4k? when free reving or under load? if u had it at the dealership they should have a cat test procedure with their scan tool , if they run too hot then theyre clogged and need to be replaced , emission warranty should cover it.

 

well first you have to figure out what is causing multiple misfires - plugs, coils, intake leak,dirty of damaged MAF etc.

second, fuel pressure isn't supposed to move, it stays constant as it's a returnless system on an NA car and I assume you have a stock fuel pump

 

+1, the misfire needs to be diagnosed. The CEL will flash when you may be doing damage, so don't drive it if it's flashing. The misfire may be so bad that you could damage the engine or ruin the CAT.

 

its 2003 78000miles on it,
yes! it has been lowered by spring, intake, clutch,

Can i use emission warranty with these mods on it?

Yes, I already checked all the lists that you posted.

new plugs on it.
checked coil,
checked intake leak,
new maf sensor.

But....cannot figure out it.

I might put test pipe that just see if that is my problem.

so, you think its not a fuel pump or fuel filter problem..?

Yeah, i think my cat is clogged.

im thinking to getthing either berk test pipe or z1 test pipe.
any recommendation?

 

Installing aftermarket parts won't help fix your problem. A misfire is not caused by a clogged cat.

 

i have seen many cars have misfires due to clogged cats.

 

thanks for comment.
I'll try put test pipe first to see

 

did you ever get this fixed ?

 

not yet man.
waiting for part arrive.......

do you have same issue?

 

i do. i just changed the tb and still no good looking to reset the ecu.

 

How did this end up turning out? I have an 03 with pretty much an identical issue, With 120k miles/190k kms. I’ve done the sparks, the maf is fine but hoping to avoid taking the cats off because it’s a massive pain. Thanks in advance

 

he hasnt logged in for 6 years