Corolla SE Saloon 2002 1NZ-FE Swapped

[hasankhurshid29]

So why fuel average is bad if plugs are even giving ok sign?

[Hassan1991]

Mileage is not that bad to make plugs completely black.

[xenerking]

to me the plugs are covered with grey ash residual from oil burning, a bit similar to 2 stroke engines.

which oil are u using? u can try changing sources to confirm the authenticity of the oil.

frankly, i feel its a bit on the higher side, oil consumption within the tolerable limits dont leave such residual/

wat is ur current fuel consumption figures?

if u r using 1NZ fe with oil 2ZZ wiring then there must a fuel trimpot installed to control AFR, try adjusting that with help of exhaust gas analyzer.

else MAF and O2 sensors are responsible to maintain AFR and fuel consumption, confirm their proper operation within limits set for this particular engine. also check if u r using correct MAF for 1 NZ fe or not.

just me 2 cents, rest experts can guide u better

[dayrider]

You need to go to a technically qualified mechanic who is literate, they will diagnose what part of the swap went wrong

[hasankhurshid29]

I swapped with complete wiring and ecu and O2 sensor. Will check the MAF part number and match with the 1nz setup I have.

[hasankhurshid29]

I have to diagnose myself. Don't wanr to give to a mechanic who will blindly tell me the cost and didn't even want to guarantee mileage after his wiring change.

[dayrider]

For starters, check the live perimeters, fuel pressure, once that is clear then we have to check timing and ignition, for that, specialized equipment is needed, can you arrange

[rajaatta]

Oil burning along with rich fuel mixture

[atharhasan]

Change it. I mean mechanic

[hasankhurshid29]

I bought this O2 sensor from ebay. Got it 2, 3 weeks ago. I installed it and reset ecu by removing battery terminals. On first full tank it gives me 9.1 km/l but now again it drops to 7.5 km/l.
@Xulfiqar @Hassan1991 @xenerking

Here is a video of O2 Voltage at idle, 1.5k, 2k, 3k rpms with transmission in neutral: https://youtu.be/YiCsI29eztw

[Xulfiqar]

Rule when installing afr and oxygen sensors is that you never ever buy unbranded aftermarket unless your aim is to immediately dump the car to the next buyer right after inatall.

Always buy genuine manufacturer like denso, ntk, bosch, siemens etc and dont cross change them, meaning dont install a bosch sensor on a car that was originally equipped with a denso sensor from factory and vice versa.

Same goes for almost all other critical load sensors like MAF and MAP too.

Im telling this from my experience wrenching on cars.

[Xulfiqar]

Your video shows that the sensor is sort of biased lean. Its switching but is more towards the lean side.

Are you seeing a steady load PID and what are the MAF readings while this is happening? You maybe having a slightly malfunctioning injector.

[hasankhurshid29]

In the video, you can also see MAF reading in the bottom

[Xulfiqar]

You will need to do load test on MAF to see performance of it. Slow acceleration and holding of rpm doesnt quite mean anything for a MAF.

[hasankhurshid29]

Oem O2 is very expensive around 20k to 25k pkr

[Xulfiqar]

You get what you pay for!

Cheap/fake/replica parts = crap results.

[hasankhurshid29]

This time I poured this oil and replaced the oil filter also with oem one as the last oem oil filter was used for 2 oil changes
I am trying this new oil from Puma. I bought from their official store on Daraz. It was relatively cheap than others.
Oil consumption remains constant and I can easily drive for 5k kms with 300 ml to 500 ml top up and still maintaining the oil above low mark.

Date: 5 November 2022
Odometer: 186,850 kms

[aziz.rehan]

Clean engine a little

[hasankhurshid29]

When I will buy pressure washer I will clean it

[helper_learner]

No no no, engine par thora rehem kar dain... just clean with water using filled "donga"