99 7.3 running rough - Ford Powerstroke Diesel Forum
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post #1 of 10 Old 02-06-2010, 03:53 PM Thread Starter
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99 7.3 running rough

I have 99 7.3 that about a week or so ago started running really rough. A fiend of mine (lead mech. at @the city garage) brought over his snap-on diagnostic tool. Scanned it found no codes. Went through complete engine check found #8 injector had a problem traced back to brown wire w/ white stripe was chafed. Found that by pushing near connector. Ran fine for a while, till I hit a few bumps then the problem rearose. Is it more likley the main to harness or the valve cover and injector harness? The main harness is dicontinued from ford but I found a new oem for 513.00 with discount from 800.00.
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post #2 of 10 Old 02-06-2010, 04:02 PM Thread Starter
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99 7.3

NO CODES are coming up
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post #3 of 10 Old 02-07-2010, 03:35 AM
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What connector are you pushing?

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Rudy's Diesel Performance - 919-383-9300 - Diesel Tech

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post #4 of 10 Old 02-08-2010, 07:31 AM Thread Starter
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right near where the main harness plugs together.
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post #5 of 10 Old 02-08-2010, 08:18 AM
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there are repair kits that can be ordered... cut off the harness that goes into the VC and put the new one on... are you sure its not the harness under the valve cover??? also a buzz test should be able to tell you if it is electrical problem to the injectors... did your buddy do that???
post #6 of 10 Old 02-08-2010, 10:39 AM Thread Starter
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Yes we did buzz test it. no problems there. It seems to be only really happed on a rough road. It acts up until I restsrt it. The wire that was found earlier was control power to the sensors. I did see the splice in kits but I am getting a light shock while getting out of the truck. That is why I think the top engine harness is a problem.
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post #7 of 10 Old 02-08-2010, 10:50 AM
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Check the wiring harness that runs from drivers fender to engine for chafing on the valve cover. I have seen many 7.3 's rub that harness and ground out.
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post #8 of 10 Old 02-08-2010, 12:56 PM Thread Starter
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This truck is driving me nuts. The harness that I found the bad wire was on the harnessn that connects on the drivers valve cover to to injectors sensors and so on. Are you talking about the harness that feeds that one? Anyone know of a tech bulletin about clips inside the valve cover for that harness?
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post #9 of 10 Old 02-08-2010, 12:57 PM Thread Starter
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If so which end of theharnes should I check. At valve cover or on wheel well.
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post #10 of 10 Old 02-15-2010, 08:07 AM
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Go to :7.3 Repair Help - Ford Powerstroke Diesel Forum and look at Marty's info. for help on the under valve cover harness repair. He shows the OEM repair part and its number. I repaired my truck with this part (about $14 and 2 hours of work) Good Luck
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