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Old 02-07-2018, 11:14 AM   #1
SC1448
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Default 7.3 Diesel Help Needed in Norman, OK

Any recommendations for help with a 7.3 Power Stroke that won't start in the Norman, Oklahoma area? Thanks an advance Class Racer
-Don
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Old 02-07-2018, 11:22 AM   #2
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Default Re: 7.3 Diesel Help Needed in Norman, OK

Check lift pump located under floor boards below driver seat. Lifts fuel from tank up to lnjector pump Should make noise and pulse if working. Easy to change. Messy. Parts available at most parts stores
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Old 02-07-2018, 11:30 AM   #3
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Default Re: 7.3 Diesel Help Needed in Norman, OK

Cam sensor. I carry a spare. Happened to a friend a couple times easy to change
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Old 02-07-2018, 01:35 PM   #4
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Default Re: 7.3 Diesel Help Needed in Norman, OK

Open up the fuel filter reservoir on the engine and look to see if there is fuel up to the top. Cam Sensor is next. Check the oil level. Those engines use the engine oil to compress the diesel fuel. Cranking speed is also important to build fuel pressure. also if its cold outside check to see if the glow plug relay is working.
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Old 02-07-2018, 02:56 PM   #5
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Default Re: 7.3 Diesel Help Needed in Norman, OK

Thanks for all the help guys! After plugging the block heater in for an hour or so, it started normally. He's also been to the Ford dealer to pick up a CPS. Back on the road to Breckenridge, CO currently, I'll suggest making sure the glow plug relay is operating normally next. He just bought the truck in Florida where cold weather starting was probably not much of an issue.
Any recommendations for a good Diesel shop in / around Breckenridge, CO???
Thanks again!
-Don
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Old 02-07-2018, 05:55 PM   #6
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Default Re: 7.3 Diesel Help Needed in Norman, OK

He may also want to pick up a set of valve cover gaskets. I know that sounds funny but the wiring runs through them and over time causes problems with the glow plugs and injectors. it is another common problem.
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Old 02-07-2018, 06:38 PM   #7
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Default Re: 7.3 Diesel Help Needed in Norman, OK

Depending on the mileage and "IF" the glow plug harness has ever been changed those little wires disintegrate over time and the plug (plastic) at the valve cover gets brittle and cracks or just melts, and the valve cover gaskets start leaking a little they get brittle--- Get either the Ford OEM (very pricey) for the Dorman gasket/wire harness buy the whole thing they sell them by the EACH no set of 2 here-- don't buy any of the gippo versions you will be sorry later on--- plan on spending about 4-5 hours to replace them also while you are in there you might want to consider replacing the glow plugs at the same time get the
Motorcraft or Beru should run about $80-90 for eight ---STAY AWAY FROM AUTOLITE GLOW PLUGS pain in the *** job but if it has to be done you might as well do both at the same time--- If you ever replace the batteries ALWAYS replace both at the same time----check the starter too if the truck has a lot of miles they should crank over really fast when you hit the key ---FED 387

Last edited by FED 387; 02-07-2018 at 06:47 PM. Reason: spelling
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Old 02-08-2018, 11:52 AM   #8
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Default Re: 7.3 Diesel Help Needed in Norman, OK

He made it back to Breckenridge with no problem and left it unplugged so it would be cold this AM. After replacing the CPS this morning, no change, cranks fine but no start. The tach is moving while cranking the engine. He's investigating the glow plug system next and will start with checking the relay operation. I've done the v/cover gasket dance with mine and I think it is going to be a little much for his abilities, especially out in the cold and snow. Fingers crossed for a bad GP relay next....
Thanks again for the tips!
-Don
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Old 02-08-2018, 01:35 PM   #9
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Default Re: 7.3 Diesel Help Needed in Norman, OK

Check the oil level too. There are 2 oil pumps on a 7.3 one for engine lube the other for fuel. If it's down a few quarts no pressure and no fuel so no start --- next listen to GPR for clicking sound mane the inside terminals are ad ed causing no contact. They cost about $20-30 eAsy fix get a "good one" don't buy a cheap piece of. Crap just asking for more trouble How many miles and what year is it? I live in Chicago and never plug mine in starts right up 2000 with 287,000 on it .. will tell you you need good. Battery's to crank it over and to warm glow plugs if the batteries are marginal will cause problems too-- Fed387
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Old 02-08-2018, 07:12 PM   #10
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Wink Re: 7.3 Diesel Help Needed in Norman, OK

If the tach is moving then the CPS is ok. If the temperature is around or below freezing and it wont start then probably has a bad glow plug relay. You can check the glow plugs to see if they are bad by just checking the resistance to ground of the glow plug at the harness connecter. Should be 2 ohms or less. Ya they do have glow plug harness/valve cover issues but usually if it is affecting the glow plugs it will affect the injectors as well as in causing a misfire and CEL on. If the relay is bad just take a heavy jumper wire across the two big terminals and the glow plugs will heat up.
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