Missfire 172

[domjolly]

So the 172 still has a missfire wondering what to try next so far

i have pulled a ht lead off 1 at a time whilst running and this makes a change to the way the engine runs so I know there is nothing wrong with the coil pack, leads, injectors from what I gather.

i had a fault with the lambda sensor (its a phase 1) so only have one sensor changed that, and it sorted itself out for a couple of weeks but now it has come back worse! So would you check the lambda sensor again or do you think it would be pointing at a sensors fault?

 

[llgsimpson]

due a timing belt change?

 

[TheEvilGiraffe]

Pulled all the plugs out ?

50p says it'll be cyl 3 (3rd from belts) as that's normally the culpret.

Assume it only misses under load ? Hence no change when you take a lead off..

 

[domjolly]

Belts done last year by a specialist who is highly recommended on here.

yeah mainly only misses underload, ill check cyl 3 as well thanks for the info.