What I have learned thus far - Diesel Forum - TheDieselStop.com
'99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the '99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

  • 1 Post By bigbird34
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post #1 of 2 (permalink) Old 11-09-2016, 06:13 PM Thread Starter
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What I have learned thus far

My Ford 2001 C.C. 7.3L truck has been becoming harder to start even in warm weather , with 160 K, I jumped the gun and installed 8 new Glow plugs, I have a lot of tools and time on my side .(8 hours of time,what a PITA). After installing new G.P.'s there was no change in this starting issue ( Should have tested them first ).
Then the truck went to the local garage for tranny maintenance etc, and the fellow tested my G.P.R. and he stated it was'nt working !!! So back to my garage and got the meter out,sure as Chit , I was only getting 10 volts to the hot side of the GPR...(eh gads, my batteries suck). Nope corrision under the rubber cover ," a bunch of corrision", you couldn't see it becausof the rubber cover protecting the hot side of the GPR . So I cleaned up the corrision and tested voltage to the GPR (yes 12+ volts) started the truck up , and the old girl fired right up ! I should have tested the GPR FIRST ! A new GPR was ordered and installed as the original had 160K on it and winter is coming !

Next was intermintent default of defroster to windshield ,no control over the vent control, all air flow went to the windshield ( I hate cold feet ). So I know I have a vacuum leak , and I have a lot of tools, and buckets of spare time . I started with a manual vacuum pump and another vacuum gauge to test the hubs in the truck and they tested OK . Then testing all the other lines,all lines are fine, and if you take the vacuum line off of the vacuum pump and block the intake with your finger it shuts off almost instantly ! and I found out that the vacuum pump will pump down to 17 ,SO IT"S NOT the pump ,I even checked the resevoir for a leak ,and no way everything is good .
So why is my vacuum pump running forever and the vacuum pump is not shutting off ? Well let me tell you guys it's the Vacuum switch for the 4WD that is DEFECTIVE .....and not all the time in my case . So I ordered a DOORMAN from Ebay and voila ,defrost system is working 4WD is working all for $35.00 .FYI once the new vacuum switch was installed ,it took the little vacuum pump 1min and 45 sec. to pump down the sytem and shut itself off
So the lesson I have learned is to test the componets , DON'T jump the gun . If your not mechanical find someone that is ,and use youtube as that is an ocean of information for you to use !

And "Thank you gentlemen" for taking the time to post all the issues and all the repairs to keep our old S.D. running the best we can !
You never stop learning

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2001 F350 XLT,Fx4,7.3,auto tranny,S.D.,C.C.,S.W.w/8 foot box,A.R.E. High Cap,Hyperchip,Bedrug Bedliner and a 9'Snoway snowplow.
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post #2 of 2 (permalink) Old 11-09-2016, 08:00 PM
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Good advice bigbird, thanks for posting. Love my 01.

2001 Lariat, F250, 7.3, 6-speed, 3:73, Ford AIS, MBRP 4" turbo back, ATS ported housing, 205 t-stat, Infinity DX w/DP Tuner 80hp tow, coolant filter, Hutched & Harpooned, EGT & Boost gauge. Fuel Mavericks with 285/18, 86k miles(Jan-2017) Bought brand new April 2001.
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