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Old 02-13-2012, 04:43 PM
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Question Truck starts. but slowing down

My 01 Superduty has been a great running truck. It has good power, and runs smooth, but lately the starts are taking a little longer. It still starts on the first try but instead of the way it use to fire off pretty much right away, it now takes about a second or one and a half seconds before it fires.

Are the injectors getting weaker? Or do I need to check the glow plugs, and/or the relay? Truck has 218,500 on what is believed to be all original stuff, injectors, GP's, etc.


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Old 02-13-2012, 05:19 PM
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More than likely the oil side of your injectors are worn. The poppet valve doesn't seat and the leak high pressure oil internally. A remaned set from a reputable shop like rosewood diesel will make your truck run better than you remember.
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Old 02-13-2012, 05:45 PM
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Psshh that's fast compared to mine.
Load test batteries. 850CCA minimum. Good connections, cables, starter connection. GPR, GPs, UVCHs, run some RevX maybe, or a thinner oil. Clean oil and filter. That's just a start.
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Old 02-13-2012, 05:57 PM
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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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Old 02-13-2012, 07:17 PM
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Quote:
Originally Posted by bigcountrysg View Post
First off let's get more info. Do you have white smoke at initial start up? Are you sure items have not been replaced?
OK, it only smokes white smoke when it's really cold outside and I forget to plug it up the night before. Otherwise, it does not blow white smoke, or any other smoke. I have noticed that the start times are the same whether the truck is completely cold OR whether I start it after it's up to temp.

It's not bad really, but just noticeably longer that it was. I have recently switched from regular Shell 15W-40 Rotella to the T-6 Rotella (10W-40 semi-synthetic) oil and I really enjoy how well it starts on cold mornings, etc.

If this is the worst that it gets then I can totally live with it, just don't want it to take any longer really.



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