7.3 knock - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 8 (permalink) Old 03-11-2011, 07:03 PM Thread Starter
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7.3 knock

I took the truck to my normal guy to put this thing back to stock and sell. he's the one who installed the parts so i got him to uninstall them. after getting the stock injectors put back in a contribution test showed #'s 4 and 8 were bad. figured things might work them selves out being there was only about 20 miles put on since replacement. well after 110 miles the truck was still missing and knocking and has a shutter feel with NO power. i reinstalled my stage ones and after 110 miles.. problem is still there. any ideas? thanks

95' F250 SCLB ZF5 4x4 4.10 white
Leveled, 33's, 325hp, smoked everything SOLD

97' f250 CCSB auto, 4x4, d60 swap, 4.10 white
4 or 6in lift?, 35x12.50 terra grapplers, tymar intake, straight pipe, cales tunes,
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post #2 of 8 (permalink) Old 03-11-2011, 07:25 PM
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Re: 7.3 knock

What did he take off? Did he put new o rings and a copper washer in when doing the injectors?

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post #3 of 8 (permalink) Old 03-11-2011, 07:26 PM Thread Starter
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Re: 7.3 knock

All new orings and coppers.

95' F250 SCLB ZF5 4x4 4.10 white
Leveled, 33's, 325hp, smoked everything SOLD

97' f250 CCSB auto, 4x4, d60 swap, 4.10 white
4 or 6in lift?, 35x12.50 terra grapplers, tymar intake, straight pipe, cales tunes,
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post #4 of 8 (permalink) Old 03-11-2011, 07:39 PM
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Re: 7.3 knock

Did he take off the headstuds and springs ? Also did you check the injector cups? Did it throw any other codes?

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post #5 of 8 (permalink) Old 03-12-2011, 12:23 AM
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Re: 7.3 knock

Have you ohm'd out the injector harness at all just to see if possibly something got screwed up on the reinstall?

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post #6 of 8 (permalink) Old 03-12-2011, 05:22 PM Thread Starter
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Re: 7.3 knock

Yes he took the studs out and pushrods. From what I saw the cups seemed to be fine. And no not yet about the harness. But I was wondering if they would make it do that.

95' F250 SCLB ZF5 4x4 4.10 white
Leveled, 33's, 325hp, smoked everything SOLD

97' f250 CCSB auto, 4x4, d60 swap, 4.10 white
4 or 6in lift?, 35x12.50 terra grapplers, tymar intake, straight pipe, cales tunes,
shiftracing17 is offline  
post #7 of 8 (permalink) Old 03-12-2011, 05:56 PM
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Re: 7.3 knock

Yep. Poor electrical connection to the injector could mean a non firing injector hence the miss.

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post #8 of 8 (permalink) Old 03-19-2011, 05:17 PM Thread Starter
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Re: 7.3 knock

Right well I meant to this extent. I figured if contribution tests and what not were being passed it couldn't be that. Hpop is good. Great icp and duty cycle. Fuel pressure is good. Brand new cps from ford. Only code being thrown is for exhaust back pressure.

95' F250 SCLB ZF5 4x4 4.10 white
Leveled, 33's, 325hp, smoked everything SOLD

97' f250 CCSB auto, 4x4, d60 swap, 4.10 white
4 or 6in lift?, 35x12.50 terra grapplers, tymar intake, straight pipe, cales tunes,
shiftracing17 is offline  
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