My Vitz 2005 model has of late has started 'knocking' in low gear in stop-start traffic. If you keep on accelerating it usually does so with no problem, but if you accelerate a little then take your foot off then do so again (moving from 1st to 2nd gear I think), first there is a loss of power (loss in rpm) then knocking sound is heard. I bought the car with 16,350 on the meter got oil changed right away, had filter (oil & air) and oil changed at 18,750, had plugs changed at 20,000 when I first felt the change, now its nearing 21,000 and will be changing air filter and oil.
Is this the cat converter thing or can I get my car tuned from my mistri. My car since I started feeling it knocking a bit, is giving me 12-12.5 K/liter in the stop start Lahore city traffic with A/C on 80% of the time.
In model 2005 there are more than one cat convertors, I was reading in this thread, should I get both removed, any idead of the cost?