why does my at4 truck with the slant6 engine continualy foul up new spark plugs after 60 or70 km. it doesnt matter what type of fuel i use.
Country: AustraliaMake: DodgeModel: at4Year: 1973Engine: slant 6
Be sure you are running the correct plug gap. If this is ok then you have a fuel issue, you will need to have the vehicle tested as to why it is over fueling. Some reasons could be blocked air filter, excessive fuel pressure or low compression.
sorry i neglected to mention that only no 1 & no 6 plugs foul all the rest last as normal.
An air leak at the manifold or low compression on these cylinder will cause this. Also leaking valve stem seals.
Qualified Automotive Mechanic, LPG & Airconditioning Diagnostic Technician.