altimaSE

I just installed a new set of headers, NGK spark plugs wires, new denon high performance plugs, new high performance catalytic, new high performance resonator and a high performance muffler + a 2.25 entire exhaust pipeing, also a cold air intake system, also replace the exhaust air sensor.

Here's my question, the engine check light comes only once in a while, especilly high way driving for a certain distance and at a certain rpm "example : 3,000 rpm for 1 hour it comes on ??? not all the time, and once I drop back to 2.500 rpm the light come off, then back over 3,000rpm no more light until a while after", it come back on.

Strange, city driving no problem, it seems the ECU is always ajusting the air mixture according to the RPM or the external air temperature.
The car drives great I mean great "way more power".

Any thaughts

Ruben

The o2 sensors work with heat, and when they get too hot, a code may get thrown...

What year car is it?

__________________
Ruben - O.G. Club Mofo Mobster
2003 Chevrolet Corvette Z06
The Z06 / Z06 Replaced 350z / 350z Replaced Spec V / Spec V Replaced 3.5 AltimaSE

KA24Tech

It may just be a Catalyst efficiency code. Sometimes when the car is in a long cruise (3000 for an hour) the O2 gets into a slow small voltage wave pattern and on occassion the ECU thinks that this is a problem because it is not seeing the O2 ranging. I would take it to an Auto Zone or put the ECU into diagnostic mode and see what the stored codes are.

Troy

__________________
SHIFT_Happiness
1992 S13 240SX SE Fastback KA24DE 5 spd - Type X Aero & Seibon Carbon Hood & Hatch -soon GT28RS
1993 U13 Altima SE KA24DET 5 spd w/ Nismo LSD - A high hp FWD can be fun (GT30R Turbo inside)
1990 Z32 300ZX VG30DETT 5 spd - 600HP & Very Civilized (working on twin GT28RS turbos)
Still trying to import a 1988 R31 Skyline GTS-R w/ RB20DET-R - only 800 produced (legal under show/display regs)