[xjrob]

Hi any mechanical people out there.

how do i know if my 4.0 is running lean, reason i ask is it is getting hot, however, only when under load towing, it will sit in traffic, idle and all is ok, however towing uphill and it gets hot.

Just replaced radiator, thermostat, water pump, hoses and coolant, new plugs, leads, rotor button and distributor cap, changed oil and filter.

had thoughts it was a head gasket, however, no obvious bubbles in radiator, no coolant smell from exhaust and as said can sit in traffic or idle in driveway for 20mins and just moves between about 91 and 93 degrees.

after speaking with an old school mechanic who said it could be running lean that would make it run hot and especially under load.

supposed to be heading away on trip on saturday maybe not now