duct tape & zip ties
Join Date: Jul 2006
Location: Willis, MI
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First off let's get more info. Do you have white smoke at initial start up? Are you sure items have not been replaced?
You can check the glow plug relay with a volt meter, if that checks out you can remove the glow plugs and ohm test them if they test good then you can either put them back in or replace them.
If you are getting white smoke at start up. I suggest doing a cylinder contribution test during cold start. You have to make sure the truck is being started for the first time that day of the test. If all cylinders pass then you do not need injectors.
If your glow plug system and injectors pass these tests.
Then you need to find out what your ipr pressure is during cranking. If it is not reading 500 psi for start up then you could have a weak hpop or a weak ipr. The other issue could be your icp sensor.
If you do have 500 psi after cranking a little bit then your ipr, icp, and hpop are ok.
Which leads me to the next thing I would do which is a compression test on all 8 cylinders. PSI for compression should be around 320 for each cylinder. If you have one below 290 psi then you have a weak cylinder that is not holding compression. Which leads you into a bunch of other things. Like valves, piston rings.
But just because your truck is taking longer to start. Does not mean it is something serious. It could be your batteries are getting weak. Or your starter can be getting weak. Or your fuel pump is not supplying enough fuel.
There are a lot of things that need to be considered and looked at and checked. You will find the problem and then you can repair the problem.
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2005 6.0 Crew Cab Long Box Lariat, current truck
2004 6.0 destroyed by contaminated fuel
2002 7.3L burnt