4afe Ignition timing Problem

[pwuser167013775514]

Assalamualaikum Everyone .
Engine 4afe have a problem with ignition timing .

When i set timing on 10 BTDC with timing light car starts back fire from air intake pipe and it's damage the filter.
Filter picture link

https://mega.nz/file/AIRFjZAA#IQFY_zB0BiXJ3NqmUMZZUyT4euHrRvo2vYqc7gfply4

I set the timing when car is running on normal temperature by shorting terminal TE1 and E1
What should be the problem anyone guide me ?

Now i set the timing on triangular mark almost 20BTDC.
At this point no back fire .
Timing picture link

https://mega.nz/file/wQZ3RBBJ#tNrPKk364dUw1vNNBySUGxYfXeft0rEkXk9KAcuIftQ

sorry i tired too much for uploading reference pictures on this thread but failed that's why i share links

[pwuser167013775514]

@Hassan1991

[dani_kk]

You got any recent timing work done? Like engine timing mechanical work?

[pwuser167013775514]

No but it's a kabli engine...

[Xulfiqar]

Make sure the timing marks are true on the pulley and scale, worn out main pulley can shift the outer piece and show wrong timing.

In short

Remove tappet cover and rotate engine to cam timing mark (hole), then view the crank mark, it should be zero and distributor should point to cyl 1 perfectly. (Please make sure you have a real 4afe distributor with the correct 6+2 wire plug)

If its not then cross check tdc from cyl 1 piston position and ensure engine is 100% true time.

If it is in mechanical timing sync and mark is off, make new mark for zero point where engine stops at tdc and recheck ignition timing, make sure timing gun is full analog, if its not then rotate its dial to zero when checking.

[pwuser167013775514]

I have distributor with 6+2 wire and timing gun is not analog one .. no dail.... It's a simple one without any knob

[Xulfiqar]

Ensure that engine is mechanically in perfect time then check the crank pulley timing mark.

[pwuser167013775514]

INSHALLAH i will check after tomorrow

[dani_kk]

Ive never heard kay koi imported engine timing ki wajah se backfires deraha ho. Aur ajkal remember kabli part kum hai. Civil repaired b market mein hain.
Most of the endusers think they have struck good bargained deal but in reality they end up buying local used engines. So get it tested fully.

[pwuser167013775514]

Today i checked all the internal timings but they are ok

[Xulfiqar]

What was the mark showing on the crank pulley when cyl1 was at tdc?

[chinyoti]

Now i set the timing on triangular mark almost 20BTDC

Is a computer or a workshop included or you your self are changing engine timing with a analog gun?

[pwuser167013775514]

0 degree

[pwuser167013775514]

Workshop

[Xulfiqar]

Perfect, and was the distributor pointed perfectly to cyl1 ?

If it is then backfiring such badly at 10 degrees is an overfuelling issue, are the injectors wired up in correct pairs?

[pwuser167013775514]

Yes distributor pointed perfectly to cyl 1 ... May be back fire is due to over fuel because even at 20 degree i get alot of petrol smell from exhaust

[pwuser167013775514]

Get back fire when suddenly press complete accelerator pedal after high revs

[pwuser167013775514]

When i press sudden complete accelerator engine take a second delay then it start acceleration with little bit jerk .

[Xulfiqar]

Is your ecu wired up properly? Meaning the STA wire is getting power when starter is enagaged?

If its not then the ecu will run in a faulty state mode and never go to paired mode (your ecu runs the injectors as 2 pairs) - ensure everything is wired properly)

I have come across some swaps where the ustaad wired a single injector wire to all 4 and caused similar situation,

[dani_kk]

Most. Important thing is check your ecu which one it is.
I've seen 3rz with a 4afe ecu so juggar is everywhere.
Plus this looks you have problem with fueling system.
Check fuel pressure and is the idle smooth or you hear phak phak sound from tail pipe?