1997 F350 7.3 No Start PLEASE HELP - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 16 (permalink) Old 04-23-2017, 05:50 AM Thread Starter
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1997 F350 7.3 No Start PLEASE HELP

Hello everybody.

Sorry for posting enother no start post, but I have read everything and all I can find on no start, and haven't solved my issue.

Car was running perffectly, no issues what so ever. Then one day, it started fine, but ran rough, truck was shaking when driving, but still drove. I parked it, and next day it started, idled very poorly, sounded like missfires, and then shut off, started it again, idled poorly, and when I tried driving it, it had no power. Flooring the pedal made the truck bearly move, and then it stalled and died. Couldnt start it after that.

I have replaced fuel filter, it has dirty, and cleaned out the fuel bowl, had sand or what ever that was on the bottom. Filled the fuel bowl with diesel, installed new filter, still no start.

Replaced IPR, still no start.

Unplugged ICP, no start

It's about 50 degrees outside, so truck should be able to start even if my GP are bad. Gp relay is good.

There is white smoke, alot of it, coming out of exhaust when cranking.

No codes of any kind, no check engine light.

Any advice where to look next or what to do will be ready helpfull...

I'm in seattle area, (everett), maybe there is some one here who knows their way around 7.3...


Sorry for long post.
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post #2 of 16 (permalink) Old 04-23-2017, 11:24 AM
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Re: 1997 F350 7.3 No Start PLEASE HELP

Check your UVCH. and if your fuel filter was black you prob need to start looking into injector o-rings. There are many procedures on here for checking the above. Also, when it cranks does your tach move? if the tach doesnt show RPM then replace your crank position sensor. All of these are very common things and doccument heavily on here... you might try the search bar in the top righgt on this forum for "no start" or "no start white smoke" you'll be amazed what you find....
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post #3 of 16 (permalink) Old 04-23-2017, 01:36 PM
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Re: 1997 F350 7.3 No Start PLEASE HELP

Its a camshaft position sensor believe it or not, not a crank sensor, even though its mounted down by the crankshaft

1997 FORD F-350 7.3L V8 DIESEL Turbocharged Camshaft Position Sensor | RockAuto

Here's a good place to start
https://www.powerstrokenation.com/for...king-info.html

1997 CCFB 7.3, ZF5, 4x4, 4.10, baby swamps, TS6, E99 spyder, RiffRaff pipes, 6.0 FMIC, RSK, 315 toyo at
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2001 Excursion 7.3, auto, 4x4, 3.73, 6" Suspension lift, 37" Dick Cepeks
2000 E350 7.3, auto 2wd, 3.73, planning a TTB 4x4 conversion
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post #4 of 16 (permalink) Old 04-23-2017, 05:32 PM
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Re: 1997 F350 7.3 No Start PLEASE HELP

Believe it or not? Um, it HAS to be a cam position sensor. A crank position sensor couldn't tell the PCM what injector to fire at what time.

In any event, 50F is still STONE COLD (so it 100F) compared to the temperatures needed to start a diesel. If you're getting smoke, you're getting fuel, so the PCM is picking up the CPS. Most likely your GPs have failed. TEST the relay, the GPs and the associated wires. Plenty of threads on the topic, probably a sticky.
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post #5 of 16 (permalink) Old 04-23-2017, 07:28 PM Thread Starter
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Re: 1997 F350 7.3 No Start PLEASE HELP

tach does move.

tested the GP relay, its good.

2 GP tested bad with ohm meter.
But how would bad plugs affect the truck when it was running poorly?? and it started just fine after that, but died when i pressed gas pedal.
even with those 2 GP bad, truck was running fine with them being bad, just bad cold starts when it was like 40 degrees..
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post #6 of 16 (permalink) Old 04-23-2017, 07:32 PM
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Re: 1997 F350 7.3 No Start PLEASE HELP

Have you inspected the UVCH connectors and all the related wiring? The GP terminals run right next to the injector terminals, and any damage to either can cause the one circuit to short to the other. This could cause injectors to misfire. Ideally, along with a visual inspection for damage, you should check for continuity of the related wires from terminal to terminal, and also check that there is no cross-continuity (shorting) between any of the GP wires and any of the injector wires.
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post #7 of 16 (permalink) Old 04-29-2017, 02:02 AM Thread Starter
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Re: 1997 F350 7.3 No Start PLEASE HELP

so did more testing today. got a scan tool so i can see all inputs from sensors.

scan tool connects---------------------------------------------PCM is good?
Engine cranks, about 115rmp. -------------------------------Cam sensor is good??
ICP pressure grew at crank to 21777 kPA (3100PSI)-------ICP is good?
IPR% went from 15% to about 55% at crank----------------IPR is good? plus its new sensor. old one had loose coil
Fuel pulse width jumps from 2ms to 5.16ms-----------------injectors getting fuel??


Injectors passed buzz test, all nave nice and loud buzz. all 8 sound the same.

even spraying wd40 into intake, no start.

has new fuel filter..

battery is charged as well.

after long time of cranking, it coughs, like its barely trying to start, but it doesn't. outside temperature is degrees.




any more tests i can ran or anyone has other info?

thanks
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post #8 of 16 (permalink) Old 04-29-2017, 04:31 AM
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Re: 1997 F350 7.3 No Start PLEASE HELP

115 RPM is waaaay to slow to start. Either the CPS is providing a poor signal, or engine really isn't cranking fast enough.

Are you really trying to start the truck on just one battery? That, er, would explain it.
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post #9 of 16 (permalink) Old 04-29-2017, 07:46 AM Thread Starter
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Re: 1997 F350 7.3 No Start PLEASE HELP

batterys were little weak when i was doing the scantool tests. had them fully charged before that and it was still no start. and im using 2 batterys, both new.
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post #10 of 16 (permalink) Old 04-29-2017, 01:31 PM
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Re: 1997 F350 7.3 No Start PLEASE HELP

what is voltage during cranking?
What is starting RPM with fresh batteries?

7.3 needs a certain RPM to start...otherwise will crank all day long.
My excursion had a no start like this...it ended up being weak battery terminal connections

1997 CCFB 7.3, ZF5, 4x4, 4.10, baby swamps, TS6, E99 spyder, RiffRaff pipes, 6.0 FMIC, RSK, 315 toyo at
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2001 Excursion 7.3, auto, 4x4, 3.73, 6" Suspension lift, 37" Dick Cepeks
2000 E350 7.3, auto 2wd, 3.73, planning a TTB 4x4 conversion
21.9 liter family
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