Octavia petrol, misfiring so into garage. Misfiring on cylinders 2 and 3, changed 3 injectors .....still misfiring, any ideas...Coil, spark plus changed too. Any ideas, the car belongs to a fellow taxi operator

Which engine?

9 hours ago, albertz10 said:

Misfiring on cylinders 2 and 3, changed 3 injectors .....still misfiring, any ideas.

Misfires are usually an ignition problem not a fuel problem. So whatever applies to unspecified engine from plugs, coil, coil packs, distributor, HT leads, dynamic ignition timing...

On 04/05/2025 at 04:12, ords said:

Which engine?

I.0 tsi petrol....engine code DKRF 553524

What fuel are you running the car on? I've seen this fault before; before you head down the rabbit hole can I suggest that you do a fill-up with some Shell V-Power and see if that improves the issue. If the misfire is more prevalent at cold, then this is definitely the problem.

The theory is that the injectors are getting gummed up and with the little 1.0tsi engine, you need every ounce of help you can get. Tell the user of the car to fill up and take the car on an Italian tune-up; long fast run - keep it in 5th (don't use 6th) ; keep the engine revs high - and take it for a fast motorway/A-road blast. Don't be afraid to use the accelerator and floor it. Also check that the oil level is good before doing this.

i had constant missfiter on all cilinders, and intake ports buildup on 4 cilinder 1.5 tsi, cleaned all with home made tools, and never issued after that. 6 months..

previous i changed coils and sparkplugs, but sparkplugs were like new. waiste of money 120€ for nothing.

with 20€ i cleaned ports and valves.

Edited 16 May, 20251 yr by imart143