CPS - SOLVED
Tuned
Joined: Nov 2020
Posts: 403
Likes: 171
From: Greenville, SC
Are you familiar with the crank no start flowchart? Linking below in case you haven’t seen it already:
https://www.ford-trucks.com/forums/a...6&d=1469812367
https://www.ford-trucks.com/forums/a...6&d=1469812367
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Tuned
Joined: Nov 2016
Posts: 385
Likes: 116
From: Full time RVer
Today I soldered in a new CPS pigtail and a length of 3/18 SO cord to replace the existing CPS wires to the PCM plug. I know that's rather drastic. But after today the high temps will only be in the low 40s and my truck does not fit in any of my sheds.
I have done and checked everything I can think of and still no start. If nothing else comes to light. I guess I have no recourse but to have a tow truck haul it to the dealer 16 miles away. This will be the first time I could not fix the issues since I have owned it.
I have done and checked everything I can think of and still no start. If nothing else comes to light. I guess I have no recourse but to have a tow truck haul it to the dealer 16 miles away. This will be the first time I could not fix the issues since I have owned it.
Laughing Gas
Joined: Oct 2019
Posts: 949
Likes: 109
From: Fowler Colorado
Are you familiar with the crank no start flowchart? Linking below in case you haven’t seen it already:
https://www.ford-trucks.com/forums/a...6&d=1469812367
https://www.ford-trucks.com/forums/a...6&d=1469812367
could be pcm do you have any buddy’s around with a truck you could borrow one out of?
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Tuned
Joined: Nov 2016
Posts: 385
Likes: 116
From: Full time RVer
I don't know anyone around here that would have a PCM to borrow. That's one thing I should have a spare.
I don't understand why there are no error codes? The service engine soon light comes on for a few seconds when the key is turned on.
One thing I haven't done is remove the chip.
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Tuned
Joined: Nov 2016
Posts: 385
Likes: 116
From: Full time RVer
I sent an email to Jon at DTS explaining the issue I'm having and asked if he thinks it's a PCM problem? My PCM is a stone knives and bear skins 24 year old computer. A good test and at least all the capacitors replaced would be worth the cost IMO.
Lead Driver
Joined: May 2009
Posts: 6,815
Likes: 707
From: Tobyhanma, PA
You can test the cps is working by pulling the sensor and wiring out a bit then waving a wrench in front of it quickly with the key on.
You should notice the tach wavering slightly.
It's a simple test that doesn't require any cost involved.
You should notice the tach wavering slightly.
It's a simple test that doesn't require any cost involved.
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Tuned
Joined: Nov 2016
Posts: 385
Likes: 116
From: Full time RVer
But the tach needle doesn't move each time the wrench moves past the sensor. I had my wife move it as fast as possible and the tach needle moves about a 32nd of an inch every 2 or 3 seconds. I guess I need to measure the distance from the surface of the hole in the front cover to the surface of the cam wheel. With that measurement I can calculate the gap size. Now to find the gap tolerance.
I had the engine rebuilt by Baril in Green Bay 3 years ago. They do the engine warranty work for the Fabic (Cat) dealer. It only has about 38,000 miles on it. I find this unbelievable. Baril machined the LPOP surface and gasket surface a few thousandths in the front cover to clean up minor wear by the LPOP gears. As a result, the tolerance by the CPS sensor should be more tight than typical 7.3s. I guess the depth gauge will tell the story tomorrow.
Thanks for being persistent.
Side note: My wife (British) hates my truck. She claims it's my mistress and named it Tuppence. She states I spend a lot of time and money on it. :<{)
Lead Driver
Joined: May 2009
Posts: 6,815
Likes: 707
From: Tobyhanma, PA
Never heard of a larger magnet cps.
Did find this one, looks interesting.
https://puredieselpower.com/ford/7.3...MaAqk_EALw_wcB
Did find this one, looks interesting.
https://puredieselpower.com/ford/7.3...MaAqk_EALw_wcB
Thread Starter
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Tuned
Joined: Nov 2016
Posts: 385
Likes: 116
From: Full time RVer
Never heard of a larger magnet cps.
Did find this one, looks interesting.
https://puredieselpower.com/ford/7.3...MaAqk_EALw_wcB
Did find this one, looks interesting.
https://puredieselpower.com/ford/7.3...MaAqk_EALw_wcB
I messaged Jonathan at Diesel Technology this morning and got a reply. I was asked if the cam wheel was removed when I had the engine rebuilt? No Are their any scratches on the face of the CPS? No And to send a quality close up picture of the CPS. He also stated that it would be easy to test and that he owns a 1997 and would stick my PCM in his truck and check if it starts? Great!
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Tuned
Joined: Nov 2016
Posts: 385
Likes: 116
From: Full time RVer
I was asked to make 3 aluminum can shims and try them on the CPS. No start and no tach needle movement with either. I think it's time to send the PCM in? He did state it's very very rare for the CPS circuitry to fail in the PCM.