Bad Idm?
Cowboy Steve
If the injector o-rings are bad they will leak around the injectors right? Anything else I need to check besides the valve cover harness? I don't have a code scanner that works on the Powerstroke so I don't know if there are any codes. The check engine light is not on and I did put my old CPS back in to see if it made a difference but it didn't.
Thanks for your help guys. I really don't want to take it to a shop. I can do the work myself if I can just figure out what the problem is.
Did you already pull the VC's and check for oil leaking around the injectors?
Cowboy Steve
Here is what is needed to put a gauge together thanks to Swamps site.
If you don't have access to a scantool, then go to your local hydraulic supply
house, and have them make you up a mechanical gauge. You might spend $60
or so on high pressure hose, fittings, and a quality 0-3500psi liquid filled
gauge....but having this hose available for future diagnostics might be more
valuable than you think.
The hose which you will need will need to be about 40" long, rated for
(minimum) 3000psi working pressure (12k psi burst rating!) with the gauge on
one end, and a #6 female JIC swivel fitting crimped onto the other.
You will also need an individual fitting to screw into the head to go from the
head to the hose.
This single fitting will be a 90degree fitting # 5 "male boss" (sometimes called #
5 o-ring) on one end of the 90, and a # 6 male JIC on the other end of the 90.
Our local hydraulic shop would label such a fitting as 5MB-6MJ90
"JIC" is nothing special...it's just 'hydraulic talk' for a 37degree flare
fitting...standard hydraulic stuff here...nothing rare by any stretch.
Looking at the top of (either) cylinder head, you'll see the factory stainless
braided oil lines (one to each head) then you'll see a few bronze colored
plugs... (Engine off, of course) Using a 5/8" wrench, remove any one of the
bronze plugs, and install the 90deg fitting into the hole. (save the plug for
reinstallation , after testing). and the O-rings are reusable, unless brittle,
cracked, etc...
The single 90deg fitting will have a "jamb nut" on the O-ring side...screw the
fitting into the head, "aiming" the 90 away from the turbo, intercooler pipes,
etc...and then tighten the jamb nut, to "squish" the O-ring also locking the 90
from "spinning" around as you attach the swivel end of the hose to the 90. No
sealants, loctite, or teflon tape are needed on "JIC" or O-ring fittings...and
don't overtighten them...usually about 180degrees with a wrench past finger tight...
No I haven't pulled the valve covers off yet. I was going to do that this weekend. I have had the charger on the batteries all night so I'll try and get her cranked over today. It did fire yesterday but ran rough then wouldn't refire. I'll try and get it fired up today.
Action4478,
Thanks for the info on the fittings. It makes sence to me I work in a sawmill and work with hydraulic crap a lot of the time. I'll put something together and test it out if I can't get it refired.
I'm going to check fuel pressurewhile cranking on it if it doesn't fire. What was the pressure supposed to be while cranking?
Thanks guys.
Ford Trucks for Ford Truck Enthusiasts
Individual HP Oil rail manual pressure test - build a hand rail pressure pump consisting of a high quality lever (not pistol) type grease gun as the pump, a high pressure shutoff valve, a high pressure (3000 PSI) hydraulic gauge, a length of 1/4" hydraulic hose and a #5 ORB connector.
- Fill the hand pump with a good diesel engine oil
- Disconnect the HP oil supply line to one head, at the head by removing the fitting from the head
- Connect the hand oil pressure pump to the rail where the supply hose was connected
- Pressurize the rail to 3,000 PSI by pumping the pump. (It is pretty easy to do this with a good pump.)
- Close the hand valve and watch the pressure reading on the gauge. The HP oil system should maintain the pressure. (In a bench top environment, the HP oil system will hold 3,000 PSI for days.)
- Repeat for the other head/rail.
- It is useful to compare hot engine and cold engine results. They should be the same.
- Remove the valve covers on one or both heads
- Pressurize the oil rail's with the hand pump as described above - inspect the interface between the injectors and their bores for oil leakage - inspect the injector oil exhaust ports for oil leakage
Note: This test can also be performed by removing the IDM relay and cranking the engine in the absence of a hand pump. (Obviously, one cannot disconnect the fuel line when cranking the engine, unless one also removes the fuse for the fuel pump.) However, the pump will NOT maintain oil rail pressure when the engine isn't cranking.
Injector Oil Leaks
Injectors leaking oil do not always do so in a predictable way. For example, we have observed injectors that will hold 2500 PSI of oil pressure when stationary, but after firing a time or two will leak and not reseal until the oil pressure is significantly reduced. This is typical of an injector with debris in the poppet valve. Thus it may be that an engine may have a perfectly good static oil test (as outlined above) but still suffer from low oil pressure under full load.
Furthermore, the typical source of debris in the injector poppet valves is the O-Rings themselves. It is quite common when O-Rings fail that they extrude bits of O Ring material from the ring itself into the oil supply. We have witnessed such extrusion on upper, middle and end cap O-Rings. Once such extrusion has occurred, it is almost assured that the O Ring debris will end up in the injector solenoid, where it may interfere with proper injector operation. It is therefore our *opinion* that anytime O Ring extrusion failure is observed on a Powerstroke HP oil O ring, including the end caps, the engine be tested for sufficient high pressure oil pressure under full load.
So then I thought maybe there is something going on with the oil. I normally run Mobile Delvac 15W/40 in it. Have been for a few years. When I chabged it last they didn't have enough Mobile at the store so I bought Delo SAE 30. I looked on the Dieselman website and see that the SAE 30 is not approved for the picky Powerstroke so started thinking maybe that is the problem. I changed the oil yesterday and sucked all the oil out of the HPOP and refilled it with Mobile Delvac 15W/40, drove the truck for a while then shut it off and restarted it about ten times. Now it fires right up. Can you believe that? Anyway so my next question is, how long does it take for the oil to circulate through the HPOP res? I'm thinking it takes a little while which is why I didn't have problems until after I drove it for a while. My second question is, do I trust it? I will be leaving to go elk hunting for a week next week and I'm unsure if I should take the old girl or drive my Toyota over there. What do you think?
Thanks for your help
Mark
Last edited by MPlayer; Nov 8, 2007 at 05:16 PM.
Thanks again guys.
Mark




