Need some help on Injector diag........ - Ford Powerstroke Diesel Forum
 
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post #1 of 7 Old 03-09-2011, 03:37 PM Thread Starter
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Need some help on Injector diag........

Well it's just another 03' 7.3 with hard cold start (like 50deg) The GPR and all 8 GP's are working properly. We pulled the v/c's off and ran compression tests and found all to be low (think she was dusted). It actually runs pretty good when warmed up though. It passes buzz test and cyl cont when warm. I started it with the covers off and shot the manifolds with a temp gun. #1 is barely firing 3,5,7 all cold. We noticed no oil was coming out of the spill ports on 3,5,and 7. Seems like a longshot that all 3 of those in a line would fail. Truck only has 110,000mi. Is there an oring that could be blown causing me to lose pressure in the LH oil galley? I'm going to run a pressure test in the morning to see wtf is going on.

Any help is apperciated................

3- F450 7.3L
5- F450 6.0L
2- F250 6.0L
1- F350 5.4L
And a partridge in a pear tree.....
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post #2 of 7 Old 03-10-2011, 07:59 AM Thread Starter
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Anyone?

3- F450 7.3L
5- F450 6.0L
2- F250 6.0L
1- F350 5.4L
And a partridge in a pear tree.....
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post #3 of 7 Old 03-10-2011, 08:04 AM
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What kind of compression numbers where you seeing?

Email: Dave@powerstroke.org
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post #4 of 7 Old 03-10-2011, 08:41 AM
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Make sure you dont have fuel in your coolant!!!!
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post #5 of 7 Old 03-10-2011, 09:05 AM Thread Starter
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Quote:
Originally Posted by Dave View Post
What kind of compression numbers where you seeing?
Low 300's. I know this is a rebuild situation but the owner just doesn't have the coin right now. (Also, the engine was stone cold at the time)

If I can get all the injectors firing it'll make a big difference.

3- F450 7.3L
5- F450 6.0L
2- F250 6.0L
1- F350 5.4L
And a partridge in a pear tree.....

Last edited by RealdieselsRyellow; 03-10-2011 at 09:25 AM.
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post #6 of 7 Old 03-10-2011, 09:23 AM Thread Starter
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Originally Posted by THERIG View Post
Make sure you dont have fuel in your coolant!!!!
No fuel in the coolant, no oil in the fuel. I'm guessing it may have 3 injectors with stuck poppets. I'm pretty sure the fuel portion of the system is working.

We're going to check ICP press while cranking and also watch for oil coming up around inj body.

Engine doesn't use oil at all. Maybe 2qts/5000mi

3- F450 7.3L
5- F450 6.0L
2- F250 6.0L
1- F350 5.4L
And a partridge in a pear tree.....
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post #7 of 7 Old 03-10-2011, 10:56 AM Thread Starter
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*Update*

Injectors are junk! Ran buzz test again with even bank unplugged just to hear the odd injectors. 3,5,7 are really quiet. We moved the plug from INJ #1 to Inj #5 and buzzed again, still quiet. Seems like they all have stuck poppets.
2 and 8 were replaces about 30k ago and they seem to be quite a bit louder than the other 6. Way more noticable today since it hasn't been started and the v/c's are off.

Dammit! Seems pointless to put 6 injectors in a fuct motor

3- F450 7.3L
5- F450 6.0L
2- F250 6.0L
1- F350 5.4L
And a partridge in a pear tree.....
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