Not Gp's or GPR Please help!!

[whitewon9395]

Alright heres the deal, 02 7.3 PS won't start when it's cooler/cold--unless the block warmer is plugged up overnight. Here's the catch: replaced all glow plugs and the relay and here's the real freaky part--both are tested good and operational and functioning. I don't understand it, if the relay is sending the power and the GP's are receiving the power what else could the problem be???? PS we're in South Carolina (Myrtle Beach) and it's not Maine or Alaska cold!!!!

[pinkfloyd]

what is the voltage on your batteries showing. i.e. unhook one and check then check the other. how fast does it crank. when was the oil changed last. the reason I ask these things is because I've had hard start issues in the past and one or more of these things can cause a hard start. The latest thing I've found is a high torque starter can make a world of difference when it starts to get cold out. For example, last fall I noticed my truck would take longer to start (it was about 50 degrees). The colder it got the longer it would crank. Glowplugs and relay were all good along with the batteries and the oil and fiters are changed regularly. Eventually I had to replace my starter, of course when it went it was in the single digits with 30 mph winds. I got a high torque starter and it fired right up after sitting for 2 days. Don't underestimate how much torque it takes to turn these motors. The colder it gets the more torque it takes to turn them.

[Rob]

Engine oil temp sensor.. if it is bad, it wont allow your relay or glow plugs to turn on.

[joe2kps]

Do you know the part number for the engine oil temp sensor?

[fordmasterdieseltech]

how long does your wait to start light stay on, when you first start it in the morning? does the light come on at all?

[joe2kps]

Anyone know the part number to the engine oil temp sensor for the 99-03 7.3L? I'm almost certain this is causing the same issue with my truck. Thanks