***Changed some injectors now cant get it to start, WTH?*** - Ford Powerstroke Diesel Forum
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Old 01-12-2012, 06:43 PM
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Question ***Changed some injectors now cant get it to start, WTH?***

Had my SES light come on two or three weeks ago. Bunch of question asking and visit to Ford dealership later I get to this point. Tech said #5 injector was showing bad. Ohmed them out showed good yada yada. Took valve cover off, harness still had good connection. Started disconnecting each injector. #1 & #5 made no change in how the engine was running when I unplugged them, #3 & #7 made the engine stumble when unplugged. So I came to the conclusion my #1 & #5 injectors are bad.
Buddy had some spare injectors that he removed from a good engine (AD code, mine are AB) he said I could try. Took out #5 first and let oil/fuel run into cylinder. Waited a bit to let mixture empty out of rails. Cleaned out injector cup and used a vacuum pump to suck out most of the oil in cylinder (got about 15-17 ounces out). Coated new seals with oil and installed my "loaned" injector continued on to #5 did the same (barely any oil ran into cylinder). Turned crankshaft over by hand three times (moved freely). Took fuse #30 out (so it wouldn't fire up) and turned engine over for two 5-7 second cranks (turned freely, no hydro lock going on ). Changed out all four glow plugs on passenger side at this time. Put fuse #30 back in and attempted to start. Probably tried cranking it 12-14 times over a 2-3 minute period (no more than 15 seconds for the longest attempt). Batteries started dying so had to quit trying.
How long before this thing fires up? Any thing I can do to purge the air out besides cranking on it (I assume the air in the system is why its not starting)? It's always fired up pretty quick so I'm stumped. HELP!
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Old 01-12-2012, 06:55 PM
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It's probably all the air like you were thinking.
Does the WTS light come on?
Does oil pressure come up while cranking?
Does tach show while cranking?
If so, it's probably all that air.
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Old 01-12-2012, 07:36 PM
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Quote:
Originally Posted by jesilvas View Post
It's probably all the air like you were thinking.
Does the WTS light come on?
Does oil pressure come up while cranking?
Does tach show while cranking?
If so, it's probably all that air.
Thanks for quik reply.

WTS comes on (my LED glow plug light comes on also)
Didn't even pay attention to it.

Tach shows (kinda erratic??)

Gonna check my HPOP reservoir tomorrow again (it was alittle low when i checked it before trying to start it).
So how long ya think I should hold the key over (I just installed a Powermaster Ultra torque starter a month ago)?
So it wouldn't even attempt to start off the driver side bank (didn't touch that side) if I got air in the system from passenger side bank?

Last edited by altoids; 01-12-2012 at 07:41 PM.
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Old 01-13-2012, 04:26 AM
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I don't think it'd be able to run very well off one side, and probably not even start. But who knows.
I wouldn't hold the key over for more than 10-15 seconds at a time, and then giving it a little break in there.
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Old 01-13-2012, 06:24 PM
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I just changed all eight of mine and it took a good bit of cranking to even fire the first time and it stalled immediately. It seems to take a while to move the air out or squeeze it down enough to get the high pressure oil high enough. I almost threw a fit waiting for my truck to fire, though I had finally finished it off! Best of luck
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Old 01-13-2012, 07:08 PM
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Well hooked charger up. Disconnected UVCH at cover for both banks. Filled HPOP reservoir to the top. Turned engine over for 20 seconds, waited about 45 seconds, turned it over again for 20 seconds. Hooked UVCH's back up. Let batteries charge up some more. Turned it over, oil pressure gauge started to move after about 5 seconds. After 10 seconds it started to attempt to fire then after 15 seconds it fired on up. Yeeeaaaahhhhh. Appreciate all the help guys.

Last edited by altoids; 01-13-2012 at 07:12 PM.
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Old 01-13-2012, 07:13 PM
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You will need to drive it a little bit to get all the air out of the system. If you did not do that it may start hard next time.
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Old 01-13-2012, 07:33 PM
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I never though about taking off the UVCHs, but can't see how it'd help.
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Old 01-14-2012, 06:43 AM
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Quote:
Originally Posted by jesilvas View Post
I never though about taking off the UVCHs, but can't see how it'd help.
Suppost to keep the injector solenoids from firing to help build pressure and prevent internal scoring of barrels??
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Old 01-14-2012, 07:07 AM
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Yea the injectors won't fire without it but not firing means all you're doing will be pressurizing the air that's in there. Unless the air can be pushed back out somehow with the injectors firing?
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