Ask a Heavy Equipment Repair Mechanic for Answers ASAP
Hi. Thanks for using JA! I will try and help you out.
I would like to ask you a few questions first, I hope that is OK.
Could you get me your engine serial number please?
When you say the fuel primer is pressurised, are you saying that when you activate it, it gets stiff and you can here the relief valve popping off?
Did the engines check engine light come when it shut down?
If it did, I would suggest pulling the flash codes from the ECM. Here is how to pull them.
Use the following procedure to retrieve the flash codes if the engine is equipped with a diagnostic lamp:
The yellow lamp will flash in order to indicate a two digit flash code and the SET/RESUME switch may be released. The sequence of flashes represents the system diagnostic message. Count the first sequence of flashes in order to determine the first digit of the flash code. After a two second pause, the second sequence of flashes will identify the second digit of the flash code.
Thanks for the information.
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Since you have pressure on the hand primer, I assume that the engine has enough pressure to crank. You may not here a popping on an 8YL engine.
There are only a few other things that can cause the engine not to crank and run.
First is power to the ECM. A good way to tell is the ECM is getting power is the check engine light. When you turn the key to the on position, the check engine light should come on then go off. If it does not come on, the ECM is not getting power. I would check the fuses.
Second is the engine speed timing signal. This signal comes from the 2 sensors that are located on the drivers side of the engine, behind the front cover.
Thanks for the information. Here are the locations of the components,
http://dl.dropbox.com/u/11922365/IAPCV%20ESTS.doc <<<<<<<<< click here
I'm sorry, I did not receive a reply about the link not being able to load.
Let me know how you make out.
Catman,is the regulator accesssible from under the hood or from underneath the truck,also what actually is the pumps function and do you have any idea what the pump costs?
You will need a 5000 psi gauge. You hook it to the metal output line of the pump that connects to the head. Once it is installed, you crank the engine. Of course the engine will not start. But you must have 4000 psi steady (no fluctuation) while cranking. If the gauge fluctuates or does not make 4000 psi, either the valve is bad or the pump. If it fails the test, I would replace the Injection Actuation Pressure control valve first then retest.
Please be careful. This high pressure oil can be very dangerous.
Basically, if te engine has a problem with the High pressure oil, it could be caused by the HEUI pump or an injector.
Pressure testing the pump, or deadhead testing it as it is sometimes called, is just the procedure to diagnois the HEUI pump.
If there is an injector leaking oil, you do not need to test the pump.