On accelerator lift off whilst stationary the exhaust backfires. You can hear this when sat in the car but mostly out back behind the exhaust. Its not a ‘bang’ but its definitely backfiring. The spark plugs have been changed (they were well passed their best). Before I change the coil pack I was thinking could there be a fuel rich/build up in the system still (i.e. in the cat)?
Bad spark plugs basically mean they aren’t sparking properly and as such the engines been running ‘lean?
If I run a full tank of high RON fuel on a long run and/or put two bottles of fuel additive in to ‘clean’ the system through will this help?
I really don’t want to spend circa £80 on a new coilpack if theres nothing wrong with it and in reality the cat’s fub’arred. i.e only spend money once rather than twice to fix one issue.
Anyone had experience of a petrol backfire and how did you cure?