Cause of engine sinok?

[mark1985]

Hi guys!

Just wanna share my engine issue. Sumisinok sya during idle. Very prominent ito pag may ac (especially pag nagsswitch na ung ac compressor). The weird thing is if i reset the ecu, it goes back to run normal again. Walang issue until after 100 kms... tska palang babalik ung sinok.

Here's what ive done so far:

1. Changed iscv
2. Changed O2 sensor
3. Changed distrubutor oil seal (although may tagas lately)
4. Changed ac compressor
5. Changed spark plugs

Still a puzzle for me. Hope u guys can help out. Isang suspect ko rin is maybe a dirty fuel injector.

Corolla model po with 4age blacktop engine.

Thanks in advance!

[RomeoAlpha]

^^^check timing, check your computer box, check mo code baka may CEL na hindi mo nakikita at mukhang converted ung kotse mo. From there, malalaman mo na kung ano sira.

[mark1985]

The timing i have to visit the shop ulet for this. Yung computer box i havent looked at that yet also. Yung CEL naman, it says O2 sensor code which is weird dahil napalitan naman na sya.

I had it converted myself from 2e engine. Bumigay na kasi. Just wanna hear your inputs before i bring them to shop.

[jick.cejoco]

How are your ground wires? What is you engine vacuum? How is your exhaust back pressure?


Exhaust Backpressure


Also, check your fuel quality. The gas tank may have accumulated water over the years

[mark1985]

I'll look into exhaust backpressure. Good read there!

Ground wires seem to be fine. Yung gas tank naman is fine din. Its a jdm tank that i have the mechanic cleaned bago kinabit.

The exhaust backpressure is interesting though.

[jick.cejoco]

Sounds like you got it and don't need help