My truck has been hard to start after it sits over night and I have found that my intake heaters are not comming on. The relays have power but they are not energizing from what I have read in the manuel the computer turns on the heaters as it needs so mabe only one heater may come on in warm weather has anyone else had this problem?

 

First off, you don't even need grid heaters functioning in Alabama. I did not have functional grid heaters for 2 years here in Illinois.

But yea, your PCM sends a ground signal to one or both GH relays mounted on the drivers fenderwell.

For the hard start condition, find your air leak.......

 

truck will start with no need for grids especially if above 0* C (not sure what that is in Farenheight) as mentioned above look for air leaks, you can either park nose down hill or leave the fuel cap loose, if the truck fires right up in the morning you definitely have a air leak. leak may not seep fuel, it just allows air into the fuel lines which inturn allows the tank vacuum to syphen the fuel from the filters and lines, causing hard starting

 

The grid heaters wont cycle until the truck reads the outside temperature to be something like 60*. The colder it gets the longer the grids will cycle. This engine really doesn't need them either until you get in some seriously cold temps. If you're having trouble starting first thing in the morning but not when the truck is warm and has been running then you have a leak in the fuel system. If you haven't ever messed with the fuel system then you might want to look at the banjo bolt on the back of the engine head (torque to 18 lb) and the T fitting just below the banjo fitting. Both can cause a leak.

 

0* C = 32* Fahrenheit.

 

Darn Canadians.