Hard to start in the morning

[attaboybob]

The ole MJ doesn't like the cooler mornings

4.0 cranks but doesn't turn.

just about ready to give up, it turns over.

then, it is revving high, for about 4-5 minutes.

 

I changed the fuel filter and plugs.

air filter is fine, fuel is fine, battery is fine.

 

any ideas fellas?

 

...BOB

[87manche]

I'd check the IAC, and clean it up. THen move on to vacuum , maybe the cold has opened up a crack in a vac line somewhere.

[512tr]

Also check the water/air temperature sensors, their job is to tell the computer that the engine is cold, and the cold outside air temp.

 

The computer use these inputs to give the engine a rich gas-mixture needed in cold weather. (as the choke on a carb engine).

 

The computer also tells the IAC to open and pass more air to the engine, in order to increase the cold idle rpm.