injector harness problems...? - Ford Powerstroke Diesel Forum
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post #1 of 17 Old 03-25-2009, 04:25 PM Thread Starter
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injector harness problems...?

I'm having problems with my trusty 99 SD. It started skipping the other day and I have so far....changed the oil n filter, changed fuel filter, cleaned bowl, checked fuel pressure, replaced passenger side valve cover gasket and inner harness. I bought an OBDII scanner and of course the damn OBDII port won't communicate with it nor my hypertech ECON....figures. The damn thing skips at all RPM's.. I'm going to fix the oil cooler o-rings tomorrow. To get to the point, I washed the motor today so I could work on it and I barely made it back to the shop, it stalled numerous times, the pedal was unresponsive at times. I have washed it before and never had a problem. Also, the cigarette lighter fuse is not blown. The other day when it started skipping I plugged in the hypertech to see if I had any codes and there were no codes and it worked when I plugged it in. I'm starting to think It may be all related and a wiring harness issue. Any thoughts?

'99 7.3
Hypertech ECON
4" SS Bully Dog turbo back
K&N Cold air intake
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post #2 of 17 Old 03-25-2009, 04:55 PM
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well if you can get your obd port to talk then i would say program the truck back to stock for a start. Mines done that before and i just reprogram and it runs great again. its only happened to me a couple of times. check all your harness connections and fuses. i would replace the cig fuse anyway just to be sure. theres also a couple of relays related to the pcm you should verify those are working.

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post #3 of 17 Old 03-25-2009, 05:33 PM Thread Starter
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The ODB port started acting up last year , but then I'll try it and it works so I've never gotten to the bottom of it. Now of course I really need to use it to diagnose and no talky... I'm pissed cuz I need this truck and use it every day, put 40k on it last year. Thanks.

'99 7.3
Hypertech ECON
4" SS Bully Dog turbo back
K&N Cold air intake
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post #4 of 17 Old 03-25-2009, 05:50 PM
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well if you cant communicate through the obd port and all fuses etc are good then that say you have a bad PCM. You can try a light reset on the PCM by unhooking the batteries for like 10-15 minutes. after the batteries are reconnected and you turn the key on your should see your gauges bottom out and flip back. That tells you it reset. Then try communicating again. i'm trying to find the obd port voltage pinpoint test for you in my ford manual but no luck yet.

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post #5 of 17 Old 03-25-2009, 05:50 PM
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manual says disconnect batteries for 5 minutes.

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post #6 of 17 Old 03-25-2009, 05:53 PM
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does your cig lighter actually work when you plug something into it?

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post #7 of 17 Old 03-25-2009, 05:59 PM Thread Starter
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Thanks, I'll give it a try.

'99 7.3
Hypertech ECON
4" SS Bully Dog turbo back
K&N Cold air intake
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post #8 of 17 Old 03-25-2009, 06:00 PM Thread Starter
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Yea cig works

'99 7.3
Hypertech ECON
4" SS Bully Dog turbo back
K&N Cold air intake
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post #9 of 17 Old 03-25-2009, 06:07 PM
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if that doesn't work you could have a circuit shorted to ground.
Fan clutches are pretty common to short to ground

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post #10 of 17 Old 03-27-2009, 03:45 AM Thread Starter
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It looks like the PCM may have gone bad. I hope that's why its running rough too. Thanks.

'99 7.3
Hypertech ECON
4" SS Bully Dog turbo back
K&N Cold air intake
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