Yes it does. It uses it from the moment you turn the key, to the moment you turn it off. Fuel mixture is VERY dependent on engine temp. Colder it gets, the more gas you need in order to have a burnable mixture in a cold engine. If the PCM thinks it is -40 out, it is going to absolutely DUMP gas, resulting in a flooded engine in short order. (well, unless it really IS that cold out.....)

Stomping the pedal to the floor, and holding it there, will put the PCM in "clear flood" mode, and it will radically cut back on fuel. If it tries to start that way, or actually DOES start that way, but still RLS, temp sensor is where I would start lookin'.

 

Don't forget the IAT sensor.

 

It is about -18 where I am right now. Truck had no problem starting before. I'll give an update in a few minutes. M

Thanks I'll look into the iat too

 

Alright so I check the spark and I do have spark. It was very minimal and yellow/orangish. I know this is a weak spark.

Also, I had the battery hooked up with jumpers to a new ram 1500 and it was still slow to turn over, not sure if that would help cause the weak spark?

How would I test the coil without a multimeter? Even though it's a new coil

 

Got another coil? Put it on, see what spark looks like.

 

swapping coils would be the easiest way to test it I assume

 

One thing I never did was check the spark at the coil vs spark at the plug.

How do I check spark at the coil? I have read a million things and am slightly confused.

 

Grab a spark plug, pull the coil wire off the dist, insert spark plug, ground it somewhere nicely, crank engine, see what ya get.

 

So coil has spark, took off the cap and reattached everything. Figured out the fuel pressure is inadequate.

I figured I could hear the pump prime and I could see gas on the plugs that the pressure was great. I could prime the pump 3-4 times, then go poke the valve and it would just dribble out.

Time for a new fuel pump!

 

Put a gauge on it before you spend the money, just to be sure.