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Old 02-27-2014, 03:47 PM
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best way to pinpoint injector 94.5 psd

I have tried searching with no luck.

the truck: 1994.5 psd 5 speed 3" dp, gauges, ts chip. did injector o rings about 10-12000 ago, oil change done 2500 mi ago 7 of the injectors have been replaced by the previous 2 owners (120000 mi between the 2 and me) the truck has 201000 mi.

my issues started just after I towed my dually home (around 8000 truck and trailer, around 50 mi). I brought my dually home and my 1994 sat for 2 days, I took the alternator out (to borrow for dually) the truck sat for another 2 days, I put a new alternator in it and moved it to my other driveway, I didn't notice any big issues but I only drove it 100 ft. it sat for another day or 2. then the issues, it was real cold (around -5) I didn't have it pluged in, it started hard and ran real rough. it ran for about 5 mins and I left to go to the store about 1/2 mi away. it ran ok down my road under light throttle. once I got onto the main road I opened it up and it ran terrible. It stalled and I coasted onto a side street. I was ablw to get it re started and it idled ok. as soon as I touched the gas it would run rough and stall. It did this a few times limping it home. when I got home I let it idle for an hour. I shut it off and it re started fine. the next week it had a long crank from about 30 seconds progressively down to about 3. didn't change too much pluging it in. I noticed the icp o ring was leaking so I changed the o ring. the inside of the connector was dry and had no signs of oil. in the mist of all this I did pull out my old tony Wildman tuner to make sure it was not the problem and I had no change. I ordered a ts chip and installed that and no change. after about 2 weeks of driving it starts good but not quite as good as before and under light throttle it runs fine, under heavier throttle it feels like it has a skip. the higher I turn the tuner up the more pronounced it is. I think I have an injector getting weak. over the past year it has felt like its power has been gradually going down but it may be in my head. I did fill up at a mobil that I don't usually fill up at. I filled my dually up there at the same time and that had an extended crank for about 2 weeks as well but it was siting for 2 years so I don't know if it was bad fuel or not.

I have been told that It can be flashed to obd2 to run a cct but I cant find anyone with the correct program. I have been told I can pick up a 96 7.3 manual pcm and it will work, is this so? any help on testing and pinpointing injectors would be great. thanks, rob
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Old 02-27-2014, 03:49 PM
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o and cam sensor was done about 4 months ago
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Old 02-28-2014, 08:16 AM
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The SHIFT key is your friend. So are paragraph breaks.

Our trucks are not standard OBD-II, but if your truck has ever been worked on at a dealer, chances are it's already been flashed to the OBD-sorta-II that our trucks use. A later PCM should work as well, but in either case, you'd need to try it with someone who has AE on a laptop, or a Snap-On MT2500 or what-not.

As for fuel, did you by any chance fill just one tank at that Mobil? That's the handy thing about our dual-tank trucks. Unless you're on a long trip and want to minimize stops, it's always good to run down just one tank at a time. That way, if you have to fill up at some station you're unfamiliar with, you've always got the other tank to fall back on. Or at the very least, you've got two different batches of fuel, so if the truck is acting up, switching tanks might make a difference.

As for the extended crank time, before cranking it next time, take the fill plug off the top of the HPOP reservoir and check the level. It may be draining back into the pan while it's parked.

In the meanwhile, set that tuner back to stock and remove it. Playing around with the PCM programming will just have you chasing your tail. Generally, you want to resolve any existing running problems _before_ introducing any mods.
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Old 02-28-2014, 09:12 AM
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All 4 tanks had the same batch of fuel. Hpop res is filled. I did check that. I have tried a snap on verius, mt2500, a few code pullers, a ford issued laptop program (don't know the name) all would power up but no communication with or without the tuner.

As far as the issue starting it isn't much of an issue now. It cranks under 2 seconds before starting. My biggest issue now is I think I have a bad injector but don't want to replace 7 good ones to find the bad one.
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Old 02-28-2014, 04:29 PM
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MT2500 should have worked, if it had the K2a module in it. Generic code puller won't work. Hmm, maybe the dealer would flash it for you for not too many dollars.
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Old 02-28-2014, 06:51 PM
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Run it without the valvecovers and look for one that has a differeing amount of oil coming out the deflector spout. If you locate one that is spitting out less oil, remove the solenoid and look for a loose poppet screw. Cheers!
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