Car Brokenage Please Assist!

[Bratva]

Hi, Can you guys help me diagnose issue with my car, i went over a speedhump pretty fast and right after that i noticed my car sounding like a motorbike with no power.

So when its running, i pull the plugs off cylinder 2 and 3 and it makes no difference, so cylinders 2 and 3 are not doing anything.

When earth the spark plugs of 2 and 3 i get a spark so not an issue with ignition. I thought maybe timing jumped ? So i pull the timing covers and align TDC and all cam marks align with timing belt mark so nothing changed here.

When i pull the spark plugs the plugs 2 and 3 are black as, plugs 1 and 4 are white and look normal. Cams looks fine, oil is fine no discoloration, coolant has no discoloration either. Sounds like a 2 stroke motorbike now not much power still enough to get up some hills though.

Sounds like its missfiring through intake kind of. Car is 4afe DOHC corolla 4 cylinder, it fires with 1 and 4 and then 2 & 3. What could the issue be ? The head is 330,000k kms and has had a crack in the past , block has been rebuilt, could it be broken exhaust valves ? or something else not sure how a knock like a speedbump could have caused this to happen. Anyone can assist ! would be thankful

[Jimmy_8472]

Does anything look out of place near the no 2 and 3 injectors or their wiring plugs?

[Bratva]

Swapped injectors 2, 3 with 1 and 4 and made no difference. Swapped wiring of 2 and 3 with 1 and 4 and also no difference.

[Bratva]

Ok it looks like spark is weak, upon further testing when driving with 2 and 3 injector plug/spark plug removed i have 2x less power than with it plugged in. When earthing the cable the working ones produce very big spark gap but the 2 and 3 barely visibile, so thats why it is probably heaps black the spark plug because running ultra rich. Now to deteermine why the spark is weak as the distributor cap looks fine and new cables