Check Engine Light- constant on
Super Moderator
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From: Central Coast of CA
Look at it now, with this outline I added.
It looks like that's the shunt outlined in red.
Can you confirm this, please?
Stewart
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Joined: Sep 2011
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From: Vancouver
Stewart, good catch. That is the shunt. If the wiring is still connected correctly and functioning, there has to be a problem with either the after-market chip or the PCM. Or I suppose there could be loose connections between the glow plugs and the shunt. Or are the glow plugs not all working?
Larry
Larry
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Mountain Pass
Joined: Jun 2007
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From: Anaheim
Give that man a prize- yes we got the Excursion back last night. There is no shunt issue. Our mechanic is really phenomenal! He was 10 steps ahead of us the whole time. He had removed the chip from the old PCM and it didn't help so they replaced the PCM and all is well. They drove it enough miles and took it to the smog place and got it smogged for me. It passed. Hallelujah! The place where he got the PCM said they are going to start stocking them because the demand for PCMs is enormous! After two weeks and numerous hours spent by them diagnosing, testing, retesting, tweaking etc. they only charged us $300 for labor!!! God love 'em! He said he wouldn't have felt good about charging us for all the time they spent on it. They have a customer for life, no kidding. Highly recommended in Orange, California. Auto & Diesel Service, owner Fernando. (714) 538-5731
Super Moderator
Joined: May 2004
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From: Central Coast of CA
Give that man a prize- Our mechanic is really phenomenal!
After two weeks and numerous hours spent by them diagnosing, testing, retesting, tweaking etc. they only charged us $300 for labor!!!
They have a customer for life, no kidding. Highly recommended in Orange, California. Auto & Diesel Service, owner Fernando. (714) 538-5731
After two weeks and numerous hours spent by them diagnosing, testing, retesting, tweaking etc. they only charged us $300 for labor!!!
They have a customer for life, no kidding. Highly recommended in Orange, California. Auto & Diesel Service, owner Fernando. (714) 538-5731
Glad you posted and were able to bring a problem to the table that absolutely destroyed the "established information" we took as gospel.
Thank you!
Stewart
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Joined: Sep 2011
Posts: 979
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From: Vancouver
Wow, great news. I hope you can now concentrate on helping your family through this difficult time of life. God bless you for being willing to help out.
I am glad that Fernando was able to navigate this difficult troubleshooting swamp while holding your hand. These 7.3 engines are relatively simple when compared to the newer "common rail" versions, but there are a few unknown problems out there apparently. It has to be a relief to get this problem solved so that you can go back to driving your baby!
Please do not hesitate to visit from time to time--your story was intriguing!
Larry
I am glad that Fernando was able to navigate this difficult troubleshooting swamp while holding your hand. These 7.3 engines are relatively simple when compared to the newer "common rail" versions, but there are a few unknown problems out there apparently. It has to be a relief to get this problem solved so that you can go back to driving your baby!
Please do not hesitate to visit from time to time--your story was intriguing!
Larry
Super Moderator
Joined: Dec 2011
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The switch was made on October 24, 1999.
Excursions built from Job #1, which was July 19, 1999 for the first model year of Excursion (2000) through and until October 23, 1999 received the regular energized coil relay with a bank to bank diagnostics shunt.
Excursions built on or after October 24, 1999, have the solid state Glow Plug Control Module that provides two way communication with the PCM to diagnose each glow plug individually.
So basically, the first 90 days of Excursion production squeaked out of the barn without a GPCM, and were Californiaized with the shunted relay, along with the attendant left and right bank diagnostics calibration.
Reference Source: See original TSB 99-25-10, re-released in the entirety (without revision) at the end of 7.3L production as TSB 03-31-36.
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From: Central Coast of CA
I would really appreciate when anyone reads the above quoted post, to please take a second and click the rep icon (it looks like the scales up there on the top left of the post box) and give the man some love!
Thanks!
Stewart
Super Moderator
Joined: May 2004
Posts: 29,380
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From: Central Coast of CA
Here's the PDF of the TSB in question.
Thanks to Y2 for finding this info so it can be preserved for all time...or until FTE and the internet run into the zombie apocalypse.
Stewart
Thanks to Y2 for finding this info so it can be preserved for all time...or until FTE and the internet run into the zombie apocalypse.
Stewart
Last edited by Stewart_H; Sep 26, 2019 at 10:45 PM.
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