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Crank no start

989 Views 6 Replies 5 Participants Last post by  realdann
I bought a 96' f-450, owner said it has been sitting for about 4 years, at first starter was locked up so replaced the starter. Got it cranking still no fire, tested lift pump and it wasn't pumping so replaced lift pump and some new gas lines have been replaced, still no start. Hooked up diagnostic tool, not showing any codes, did injector buzz test everything checked out. Fuel is getting to fuel bowl. No smoke out of tailpipe when cranking. Can get it to run off of ether, I guess still a fuel issue. Any help is appreciated!
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Check fuse #9 in power block under hood- fuel bowl heater. If it is blown, that kills the ECM and no start. Its one of the big fuses....
Also do not use ether, or you may never have to worry about it starting again period. That is if this truck is a Diesel. You said you replaced the gas lines! By being able to do a buzz test you must have a Scan tool that is capable to read these trucks?
Running on either doesn't mean a thing since diesels fire on compression and don't use a spark. Also as was mentioned don't use either unless you want to perhaps replace the engine. You have a glow plug system and if a plug is hot and you shoot some either into the cylinder you can bend a rod.

Also these engines need high pressure oil just as much as fuel, so without knowing how the high pressure oil system is everyone is just guessing. Pull the plug on top of the high pressure oil pump on the top front of the engine and see how much oil in in it. It needs to be within a 1/2 inch or so of the top. If it is low fill it with the same motor oil that you put into the engine.

What type of scan tool are you using? Can it read live data as you are turning the engine over? If not you need one that will. Have you checked the fuel pressure on the filter housing? It should be 20 psi+ when cranking and 50+ when the engine is running.
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Check fuse #9 in power block under hood- fuel bowl heater. If it is blown, that kills the ECM and no start. Its one of the big fuses....
Fuse is good
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Running on either doesn't mean a thing since diesels fire on compression and don't use a spark. Also as was mentioned don't use either unless you want to perhaps replace the engine. You have a glow plug system and if a plug is hot and you shoot some either into the cylinder you can bend a rod.

Also these engines need high pressure oil just as much as fuel, so without knowing how the high pressure oil system is everyone is just guessing. Pull the plug on top of the high pressure oil pump on the top front of the engine and see how much oil in in it. It needs to be within a 1/2 inch or so of the top. If it is low fill it with the same motor oil that you put into the engine.

What type of scan tool are you using? Can it read live data as you are turning the engine over? If not you need one that will. Have you checked the fuel pressure on the filter housing? It should be 20 psi+ when cranking and 50+ when the engine is running.
So replaced batteries thinking a power issue and I had a friend come by with his scan tool and it pulled all these
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You have to think your way thru the problems and begin to eliminate possiable issues. I would go about it like this:

Im not to that familiar with your year model truck. But the 99.5 and up 7.3 need 500 psi of high pressure oil when cranking to enable the FICM to fire the injectors. Install a 4000 psi hydraulic gauge into on of the dummy plugs in the heads high pressure ports. The port is a #4 oring Boss thread. That will tell you what the HPOP is doing. If you have the 500 psi then the HPOP is getting signal from the IPR and suppling the oil the injectors to start. A buzz test should show if the injectors are getting signal from the FICM.

Next would be to check to see if you have fuel pressure. I think your model has a mechanical fuel pump that some delete in favor of an electric pump. You could disconnect the return line coming off the filter bowl and place a clear hose on over fuel bowl fitting and see if what flow you have. You may be able to hose clamp a hose on the fitting with a pressure gauge. 25 psi should be more that enough pressure. I run 60 psi with a fuel bowl delete kit in my late model 7.3.

There was an issue some time around your year model with the low pressure oil pump pickup tube cracking and allowing the oil pump to suck air and not get it's prime. The low pressure oil pump supplies oil by a tube to the HPOP reservoir. Oil in reservoir should be 1'' below the the inspection plug on top.) Not to mention lube the entire engine. The check for this was to raise the truck in the rear by a couple of feet to allow the engine oil level to pool in the front half of the oil pan and cover the crack. Truck would start.
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