Problem after injector change. - Ford Powerstroke Diesel Forum
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Old 03-09-2008, 08:59 PM
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Problem after injector change.

Hello all. I'm experience some problems with my 95 7.3 engine. I recently pulled the heads, replaced the lifters, rebuilt the injectors, replace the valve springs, and replaced the rocker arms. I fired up the truck today after finally getting it all put back together and it's running horrible. I'm getting codes for contributiont balance on cylinders 2,3,4,5,6,7.

I couldn't get it to start after the initial rebuild and found that the HPOP was empty. I filled it with about 1.5 quarts of new oil and it fired up in less than 1 minute of cranking. Starting still tankes 10-20 seconds of cranking before it starts up.

I'm wondering if I just need to drive it to purge any air in the high pressure oil lines, do I need to add more oil to the HPOP, or is it likely that something is wrong with the injectors.

Any and all advice is welcome. I'll check the HPOP resivoir in the morning since that's pretty simple. I also plan on pulling the valve covers tomorrow to see if there's anything going on with lifters, push rods, valves, or rocker arms.
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Old 03-11-2008, 06:29 PM
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ford and others want you to go on a 25 mile drive to (purge the system) it works ..the more you drive it the better it gets
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Old 03-11-2008, 06:41 PM
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I cracked the plug on one head and cracked the sensor on the other to help bleed out the air and mine smoothed right out when it started.

this is the second time it started first was about 2 min.
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Old 03-11-2008, 07:53 PM
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yea I cant fully explain why .but i have rebuilt many 7.3s and every time i have had to take er out on a long drive to get it back to normal ..ps i met a fella from AK YOU GONE OUTSIDE LATELY?
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Old 03-11-2008, 07:58 PM
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as a side note just if you havent heard when you first start one after a rebuild unplug the cam sensor and crank untill the oil pressure comes up on the gauge to insure you dont split the injector tips ,,,fyi
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Old 03-12-2008, 11:14 PM
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Clear the failures and drive it some and then retest.
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Old 03-13-2008, 08:04 AM
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I rebuilt the injectors myself using a kit for DIY-Injectors.com (nice kit btw). I have access to a VCM and when I run a cylinder contribution test the results have been different everytime. 1st, 3&4 injectors were out of balance. Then 2-7 were out of balance. This last time 4, 5, &6 were out of balance. I'm getting an ICP voltage high/low code when driving. I wonder if the ICP has gone bad from messing with it (taking it on and off) and that is causing problems with the timing and such for the injectors.

What would a split injector sound/feel like?
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Old 03-14-2008, 07:52 AM
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I replaced the ICP and found that my 6 bank chip has been causing the ICP error. It brings the ICP voltage up about .5 volt.

I've drive probably 100 miles and I'm still having missing issues.

The last time I ran a cylinder contribution test 3-8 came up as bad.

Any thoughts? Should I pull the injectors and re-clean them?
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Old 03-14-2008, 11:37 PM
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if you have the means do a buzz test on the injectors you will hear if 3 or 8 is weak selinoid wise if all your injectors sound good (the same and strong) than try this ...drain your fuel filter bowl and refill it with stanadyne proformance formula or like fluid (diesel power service) start the engine and listen does it run better??? this is a neat trick to see if you have a galled injector or injectors..with the straight diesel additive even bad injectors will run great for a minute then you will know if you have a mechanical problem or an injector malfunction...good luck i hope this helps
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Old 03-16-2008, 07:17 PM
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Quote:
Originally Posted by mechanic@ivfire.com View Post
yea I cant fully explain why .but i have rebuilt many 7.3s and every time i have had to take er out on a long drive to get it back to normal ..ps i met a fella from AK YOU GONE OUTSIDE LATELY?
last time i was outside was July went to NV when my grandmother passed away.
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