Key on, won't turn over? - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 04-30-2009, 05:58 PM   #1 (permalink)
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Key on, won't turn over?

Guys,

Had a weird problem today with the truck. Shut the truck off at a fast food drive-thru so they could hear me order my #3 with sweet tea.

Turned the key on, turned to crank, nothing. No click, engine not turning over. Cycled the key on and off probably 5-10 times with the same results. Didn't hear the fuel pump energizing/priming when I was turning the key on. Popped the truck into neutral and rolled it into a parking spot. Turned the key off for about 5 minutes, back on, truck starts fine. Drove fine all the way home, shut it off and fired it right back up 4-5 times once I got home.

Any thoughts on what it may be? Never have replaced the CPS. Would the CPS just be a turns over but no crank, or could it cause the truck to not even turn over?

Thanks in advance.
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Old 04-30-2009, 09:16 PM   #2 (permalink)
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Are you sure you shifted into park or neutral before you shut it off. You do know that if it's not in either park or neutral that no power goes to the starter relay, right?

On the other hand, if you weren't getting the WTS light when you turned the key on, then it's something in the PCM power circuit not energizing the PCM. Could be the ignition switch or possibly the PCM power relay sticking.
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Hard or no-start? Check Here
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Old 05-01-2009, 09:58 AM   #3 (permalink)
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Yes, it was definitely in park. Everything was coming on just as it should, except when you turned the key to crank the engine, nothing happened. No clicks, not fading of power as if it was weak batteries, nothing. Just silence. I don't think it was a starter issue since it wasn't even making it that far. Like I said on some of the later tries after cycling the key a few times trying, I wasn't hearing the fuel pump kicking on and priming. Then after sitting for about 5 minutes while I was grabbing my tool bag from behind the rear seat, I turned the key on again, heard the fuel pump priming, kicked the key over to crank and she fired right up. Drove home, shut it off, cranked right back up. Did this 2-3 times and have driven it since and can't reproduce the problem.

It's never happened before, and may end up being just a fluke and never happen again, but I'd still like to pinpoint what may have caused it.
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Old 05-01-2009, 10:00 PM   #4 (permalink)
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In that case, I'd lean toward the ignition switch. There are multiple switch circuits in it, one being the starter circuit that sends power to the starter relay. For it to work, the power has to get thru the fuse, ignition switch, another fuse, neutral safety switch (in the DTRS on the auto tranny, or clutch switch on the 6-speed), and then the starter relay.

Hope you can figure it out. It sucks to be stranded with a no-start.
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Hard or no-start? Check Here
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Old 05-12-2009, 11:30 PM   #5 (permalink)
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Dead ignition at start

I am having the exact same problem on my '02 F-350 2WD DRW. Mine did not start after 5 min though. I'm trying to figure out where the problem is. It was running fine when parked. I had a bad battery, replaced it, and now get nothing after WTS light and fuel pump pressurizing. I cycled the security system, and checked the fuses and battery cables. I'm VERY knowledgeable on these 7.3L's, but this has me a little stumped. Maybe a locked up starter solenoid?? Anyone have any other ideas??
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Old 05-13-2009, 12:17 AM   #6 (permalink)
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I had the exact same probelm. I could drive the truck all day then shut it off only to try to restart and nothing would happen. Checked and replace BOTH starter solinoids (one on the fender and one on the start). Still same thing would happen every now and again. Also when it would start, it would turn over real good. Replaced both batts and didnt help.


Finally ordered a new gear reduction starter after it wouldnt start after about 100 key cycles. Problem solved. These starters kinda let you know that the stators and brushers are giving up the ghost gradually. Eventually your truck wont start no matter what you do.

Cant remeber the starter I got but it was highly recomended on one of these sites and it is an absolute hulk.
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Old 05-13-2009, 11:12 AM   #7 (permalink)
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My truck was doing the same thing. Mine was that i had some play in the shifter and when i threw it into park the shifter would slide down like i was trying to go into the next and would not start. try holding the shifter up and see if it starts. I had to take out the play and now no problems.
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Old 05-13-2009, 08:37 PM   #8 (permalink)
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Found the problem

It was the park safety switch. Must have oxidized up while sitting.
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Old 05-13-2009, 09:02 PM   #9 (permalink)
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Where is the park safety switch? I've had this problem as well and would like to get it fixed. It usually does it to me after I wash the truck.
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Old 05-13-2009, 09:11 PM   #10 (permalink)
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Quote:
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Where is the park safety switch? I've had this problem as well and would like to get it fixed. It usually does it to me after I wash the truck.
It's down somewhere on the tranny. The service manual refers to it as the DTRS (Digital Transmission Range Selector), and it closes switches to tell the PCM (and the starter relay circuit) what gear it's in.
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99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version), AIS, coolant filter w/"hokum" bracket, regulated return, heated mirror mod, lighted cupholder, Marinco heater plug-in.

Hard or no-start? Check Here
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Old 05-15-2009, 10:22 PM   #11 (permalink)
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I had a similar problem, I finally found it today. ON the back of the fuse box behind the starter relay area. I had a loose wire I guess. It only seemed to mess up when the temperature was hot outside, and the truck was warm inside. It would just click a bit, AIH relay clicking, GP relay clicking, lights on the dash on, radio went off in "Start" ect... everything worked but the starter cranking. I stuck my finger behind the fuse box while I held the key to "Start" and just touched some wires, it cranked. I backed off, no crank. Touched that "Bundle" again, instant crank! I unplugged that bundle from it's indivitual plug on the power distribution box, put some dielectric grease on it, and re-seated it. Seems to start everytime now,, we'll see how long it lasts.. but at least I KNOW where the problem is now. I was having to lay under and short the terminals on the starter while the key was left on to start it when it messed up.
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Old 05-15-2009, 11:22 PM   #12 (permalink)
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You must be psychic, Jim, to find just the right spot to poke and prod. Or was it just the last place you poked around? Electrical issues like that can be a bugger to find. Yours might be a wire terminal that's come unlatched and has backed out of the connector.
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99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version), AIS, coolant filter w/"hokum" bracket, regulated return, heated mirror mod, lighted cupholder, Marinco heater plug-in.

Hard or no-start? Check Here
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Old 05-16-2009, 10:41 PM   #13 (permalink)
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I was kind of concentrating on the area behind the starter relay. And it was there. I did tug on those 6 or so wires, all pins seem to be locked in.
I don't know if it will reoccur or not, but if it does, I KNOW where to look now! LOL
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Old 10-17-2009, 09:42 AM   #14 (permalink)
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My truck was doing the same thing. Mine was that i had some play in the shifter and when i threw it into park the shifter would slide down like i was trying to go into the next and would not start. try holding the shifter up and see if it starts. I had to take out the play and now no problems.
How did you take out the play?

I believe I'm having the same issues. Here's the thread.No start unless I jump it
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Old 10-18-2009, 01:23 AM   #15 (permalink)
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To determine if it is the park safety switch, try starting the truck in neutral. If it starts, run your gear selector in and out of park a few times. There is a little electric switch in the steering column that can get oxidized and cause the problem, but a little friction on the switch from repeated movement will give you good contact. That's what did the trick in my case.
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