Join Date: Aug 2007
Location: Tucson AZ
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The solenoid you are referring to is the glow plug relay. Info below quoted from John-G at The Diesel Garage.
The most common causes for hard starting relating the the GP system are: Bad (worn out) Glow Plug relay, and bad connections to the GPs at the "UVC" (Under Valve Cover) harness.
With the Wait To Start light ON, check the battery voltage at BOTH large terminals of the GPR (Glow Plug Relay), they MUST be the same measured to BATTERY GROUND, or at least within 1/2 volt of each other. Again, with the WTS light on.
If they are not the same voltage, then make sure the GPR is actually working. With the WTS light on, there should be battery voltage on one of the small terminals of the GPR, and ground on the other. If this is true, the GPR is bad. Replace and re-test.
1997 F250 PSD, 4x4, CC, SB, 4" Lift, Dana 60 Front, Built Automatic, 4.10 LS, Blackbirds Rear Disc Brakes
Tymar Intake, Banks Intercooler, D66 Turbo, EBPV Delete, 3" Down Pipe, Kitty Gutted, Muffler Delete, Exhaust 3.5", 17* HPOP
CCV Reroute, FPR Shimmed, Rear Air Bags, Pillar Gauged - Pyro, Boost, Tranny Temp,
Tonys Tunes - Stock, Econo, Tow, Extreme
Rosewood Stage I injectors