'95 7.3 starting problems... - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 24 (permalink) Old 01-24-2007, 05:33 AM Thread Starter
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'95 7.3 starting problems...

I've been roped into working on my brotherinlaw's PSD some how... Saturday night it ran fine, but Sunday morning he started it and it ran for a while then died. After that I wouldn't start. Today I go over to work on it and they want me to check the fuel PSI so I do... Nothing! It would barely pump a little fuel when free flowing and would build any pressure. (I thought the problem might be the CPS so I look at the tach while cranking... it registered RPM so I figured it was ok)

Off to the parts store I go. $115 later for a new Carter pump I go to work. That banjo bolt under the turbo is a real *****... Anyways, I get the old pump out and find that the plunger that rides on the camshaft stayed in the hole and doesn't go with the pump. It was broken in half for some reason. The new pump went in and we cranked the motor over to prime the fuel system... Now it makes 40+ PSI, but still no start...

While cranking it over to try and get it started I notice that the tach suddenly drops to 0 RPM's... I guess that 1yr old CPS is bad too? The SES light isn't on...

Is there anything I'm missing here? I don't usually work on PSD's so I thought I might be overlooking something simple.

Thanks,
Justin

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post #2 of 24 (permalink) Old 01-24-2007, 05:25 PM
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a bad cam sensore wont always set codes if you arent seeing rpms I would say try a cam sensor

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post #3 of 24 (permalink) Old 01-24-2007, 11:20 PM Thread Starter
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Yeah, I've got one on the way. Should find out later this evening if it helps.

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post #4 of 24 (permalink) Old 01-25-2007, 02:59 AM Thread Starter
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CPS didn't work. Still not starting... There is oil to the heads and fuel coming out of the fuel filter. What next??

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post #5 of 24 (permalink) Old 01-25-2007, 03:02 AM
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ok you know you have 40 psi fuel pressure thats sufficient to run you have a good cps
I let it slip before have you check glow plugs and glow plug relay ??

if that all works ...

at this time you need a scan tool to observe rpms and Inj control pressure if the scan tool doesnt read rpms you have a cps wiring issue if Inj control pressure doesnt get at least 600 psi or so you have an ICP system issue

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post #6 of 24 (permalink) Old 01-25-2007, 03:05 AM
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Are you sure you have at least 10.5 volts while cranking? Might try hooking up a set of jumpers

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post #7 of 24 (permalink) Old 01-25-2007, 05:43 AM Thread Starter
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Yeah, it's got plenty of volts. I had it on the charger all night and used booster mode when cranking. I had the fuel filter housing to replace a hose and noticed the IPR Solenoid nut was loose... I took it the solenoid apart and cleaned it up. Put it back together and still nothing. Could the IPR be bad?

Thanks for the advice so far! As you can tell I'm a PSD novice...

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post #8 of 24 (permalink) Old 01-25-2007, 07:45 AM
 
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Check the HPOP. The oil should be within an inch from the top. Check the fuses under the hood. Sometimes the #22 fuse under the hood will blow and give a no start.
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post #9 of 24 (permalink) Old 01-25-2007, 03:32 PM Thread Starter
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The HPOP resivoir is full and will fill and overflow with the plug out while cranking. Checked the fuses first thing and they are all good.

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post #10 of 24 (permalink) Old 01-26-2007, 04:56 AM Thread Starter
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Finally got a P0603... The dealer mechanic seems to think the IDM may be toast.

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