Join Date: Dec 2008
Location: Tyler, TX
Thanked 407 Times in 347 Posts
Direct injection has nothing to do with glow plugs or not, that is a compression ratio and cranking RPM feature.
The PSDs have glow plugs so they will start well in the cold weather. You could not sell a diesel P/U if it would not start much like a gas. Basically P/U owners are unwilling to tolerate the things that truckers deal with to start their rigs at -10*F.
There are a number of possible causes for your problem, GPs are certainly one, but with the PSD engines, GP failures are truely very rare. If the GPs are not working correctly, it can commonly be traced to a bad GPR or damaged terminals at the UVC harness connector(s) (Under Vavle Cover).
The fuel injector coil gap bay now be wide enough so the magnetic force from the coil is simply no longer strong enough to lift the armature off it's seat when the oil is COLD, but once it begins to work it functions normally.
The first thing to check are the GPs and the GPR to ensure they are working properly. The GPs should light a test light connected to BATTERY power brightly. You can carefully probe the outermost two terminals on each of the four UVC connectors to test them. Any one that does not light brightly is suspect. Testing the GPR involves measuring the voltage on BOTH LARGE terminals while the WTS light is on. The voltage MUST be the same within 0.5V or the GPR is bad. Aftermarket ones fail sooner and have higher voltage drops when new then OE parts.
Oil viscosity can make the injectors "lazy", one test of the injectors is to simply change the oil to a known name brand of 10W-30 (cold months) that is API rated "CI-4" for Diesels, then to retest the cold start performance. If a simple oil change fixes the misfire or romp, then you can *suspect* that injector coil shimming may well fix your problem (if everything else checked out OK).
'93 F-250 HD, 7.3L IDI, 5spd - FARM TRUCK
I Support: Trailer brakes an every axle over the towing vehicle's GVW; CDLs for RVers; Safety inspections for ALL vehicles and 6 axle trucks (97K GVW proposal).
Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote - Benjamin Franklin
I vote for LIBERTY!