97 7.3 just quits but restarts - Ford Powerstroke Diesel Forum
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Old 02-18-2014, 04:44 AM
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97 7.3 just quits but restarts

I have a 97 F350 7.3
I can be driving along and the engine will just quit it will start right back up it has done it several times the last couple of months there doesn't seem to be any thing consistent about it when it happens. Its does not seem to be the fuel, its not when I hit a bump in the road its not the temperature it does this maybe once a week or it might do it 3 times in five minutes and it has done it sitting still. The check engine light comes on when i start the truck stays on for maybe 1 or 2 minutes but then it goes out.
Any suggestions could it be the injector/glow plug wire harness. Fuel canester heater
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Old 02-18-2014, 04:51 AM
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CPS is the prime suspect. But an important question - when it restarts, does the WTS light come on?

Auto or manual transmission?
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Old 02-18-2014, 04:59 AM
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It is a manual trans and yes the WTS light comes on
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Old 02-18-2014, 05:11 AM
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Yep CPS is the culprit more than likely get this one, its about as cheap as you can get them

Genuine Ford 7.3L Diesel Cam Position Sensor (CPS) - Blue
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Old 02-18-2014, 05:19 AM
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Actually, if the WTS light comes on, CPS is NOT a likely suspect. This is more likely an interruption in the power to the PCM. Bad connection at fuse #22, intermittent fuse op, or ignition switch intermittent failure. Do you have a lot of keys on you key ring? Does the ignition lock cylinder click normally through the positions? Does it feel "loose" in the RUN position?
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Old 02-18-2014, 05:24 AM
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Quote:
Originally Posted by madpogue View Post
Actually, if the WTS light comes on, CPS is NOT a likely suspect. This is more likely an interruption in the power to the PCM. Bad connection at fuse #22, intermittent fuse op, or ignition switch intermittent failure. Do you have a lot of keys on you key ring? Does the ignition lock cylinder click normally through the positions? Does it feel "loose" in the RUN position?
The WTS has nothing to do with the CPS. If it DOESNT come on then you are right its not likely. The computer doesnt really know if the CPS is "working" until the engine is spinning which is when the WTS light is already off at that point
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Old 02-18-2014, 05:31 AM
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This is exactly why it is NOT likely the CPS. The fact that it comes on means that the PCM has been "reset", i.e., turned off and back on. When the CPS fails and the engine stalls, and starts working again on its own, with a manual, the momentum of the truck restarts the engine via the drivetrain, but the PCM doesn't reset, therefore the WTS light does NOT come on.
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Old 02-18-2014, 05:51 AM
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Quote:
Originally Posted by madpogue View Post
This is exactly why it is NOT likely the CPS. The fact that it comes on means that the PCM has been "reset", i.e., turned off and back on. When the CPS fails and the engine stalls, and starts working again on its own, with a manual, the momentum of the truck restarts the engine via the drivetrain, but the PCM doesn't reset, therefore the WTS light does NOT come on.
WTF are you talking about, If the CPS is intermittently cutting off(which is what he has) rather than a total failure then you go to restart it will have a WTS. The CPS has nothing to do with the PCM other than telling it crankshaft position and when the PCM sees a lack of signal from it, it cuts the engine. Thats it. Then when you go to restart it, it will have a WTS again.

Yes with a manual if you have any forward momentum it will restart and the WTS light will not come on because yes the PCM has not restarted its starting cycle but if its at a stop then yes he will get a WTS light.
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Old 02-18-2014, 06:50 AM
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OP didn't say HE restarted it. He said IT restarted. Which means the engine restarted ITSELF. Exactly what any vehicle with a manual transmission will do if there's a momentary interruption and restoration of engine control. If that momentary interruption were from a bad CPS, the engine would restart itself WITHOUT TURNING ON THE WTS. If that momentary interruption were from a PCM power interruption, the engine would restart itself AND THE WTS LIGHT WOULD COME ON.

If the driver were restarting the engine with the key, your argument would have some merit. He isn't.

And the CPS tells the PCM the CAMshaft position, not the CRANKshaft position. Not that it's relevant here.

Last edited by madpogue; 02-18-2014 at 06:54 AM.
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Old 02-18-2014, 07:19 AM
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Quote:
Originally Posted by madpogue View Post
OP didn't say HE restarted it. He said IT restarted. Which means the engine restarted ITSELF. Exactly what any vehicle with a manual transmission will do if there's a momentary interruption and restoration of engine control. If that momentary interruption were from a bad CPS, the engine would restart itself WITHOUT TURNING ON THE WTS. If that momentary interruption were from a PCM power interruption, the engine would restart itself AND THE WTS LIGHT WOULD COME ON.

If the driver were restarting the engine with the key, your argument would have some merit. He isn't.

And the CPS tells the PCM the CAMshaft position, not the CRANKshaft position. Not that it's relevant here.
I do believe he did in fact say he restarted it...

Quote:
Originally Posted by Bruce97F350 View Post
it has done it sitting still. The check engine light comes on when i start the truck stays on for maybe 1 or 2 minutes but then it goes out.
How is the truck restarting if its dying while sitting, manual or auto.

And yes camshaft, sorry honest typo. See its not that hard to admit when you are wrong. But in reality it is technically measuring the relationship of the camshaft to the crankshaft provided your timed right obviously

Last edited by Rammstein1224; 02-18-2014 at 07:24 AM.
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