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Old 09-11-2010, 02:33 PM
mrbleth mrbleth is offline
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Exclamation Help! Wont start, wont crank?

Anybody have any advice? I got a 2002 Ford F250 Diesel 7.3 Automatic. I drove to store, parked, turned it off. Returned 5 min later, tried to start it. Nothing?! Wont crank..nothing. Batteries are good, lights on dash are fine. I think it's an ignition thing? I checked all fuses under the dash, all good. Please reply with any similar experiences/advice, etc. Thanks!
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Old 09-11-2010, 07:44 PM
sandmanf250 sandmanf250 is offline
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wont start

crank position sensor.and a 10 mil. box wrench.
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Old 09-11-2010, 07:47 PM
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JT301 JT301 is offline
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Does the motor turn over and won't start, or does it not turn over at all?
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Old 09-11-2010, 09:09 PM
mrbleth mrbleth is offline
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to jt301: it doesnt turn over at all, starter doesnt click, nothing. batteries good, fuses good, lights on dash good, wont start in park or drive. seems like the electricity isnt getting to starter? very strange because truck was driving fine 5 minutes before. I had it towed to my ford dealership.
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Old 09-11-2010, 09:47 PM
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Originally Posted by mrbleth View Post
wont start in park or drive.

It's not supposed to start in drive, only Park or Neutral. That's your most likely suspect if nothing at all happens when you turn the key.

If you hold the key to start for 10 seconds, do the dash lights dim at all? Are any of the battery cables warm after doing that?

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Old 09-11-2010, 09:52 PM
docsuby docsuby is offline
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Next check your grounding cable, even re-ground it with a set of jumpers if you have to.
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Old 09-11-2010, 10:31 PM
mrbleth mrbleth is offline
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I had the Camshaft Position Sensor replaced like 3 months ago, is that the same as the crank position sensor?

Thanks for the welcome, this is a great forum with lots of good advice and friendly people. Sorry, my goof, I meant to say it wouldn't start in Park and Neutral..Not Park and Drive.

The dash lights dont dim or anything, seems to have plenty of juice. Battery cables dont get warm.
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Old 09-12-2010, 08:40 AM
Lou Braun Lou Braun is offline
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I just went through this type of problem with an '06 diesel. There is a bit of electrical troubleshooting needed to pinpoint the problem.

From your description, there is no click when you turn the key and the engine does not crank. Try this with a door open and see if your interior lights dim at all when you turn the key to start. Any dimming and the battery cables/connections would be the problem.

If it is a no click, no crank condition, any one of the following can be the cause.

(1) Fuses - check your owners manual for the fuse leading to the starter relay and to the PCM. Either fuse will cause this problem.

(2) Starter relay - you would need to pull the starter relay (your relay is probably in the junction box in under the steering wheel) and see if voltage gets to the relay when you turn the key to the start position. If you have voltage to the relay then you know the ingnition switch and the transmission range sensors are OK. The relay itself can be checked with an ohm-meter, but they are cheap enough to just replace.

(3) Ignition switch - check for voltage at the starter relay. If no voltage, pull the fuse leading to the relay and check for voltage on the input side of the fuse. If no voltage, disconnect the connector leading from the ingition switch and check there. (You will need to get the electrical manual for your exact model year truck to get the right connector and wire color ID).

(4) Starter solenoid/starter - check for voltage at the starter solenoid positive terminal (between the terminal and ground) when the key is turned to start. (Need two people for this one since the solenoid is on the starter). If there is voltage at the solenoid, then the starter/starter solenoid is the problem and a new starter is needed. If no voltage then voltage is not getting to the starter and the problem is in one of the above steps. You can run a jumper cable from battery positive to the starter S terminal to verify the engine cranks (take care with this step). If the engine cranks then the starter is OK. If the ingnition key is in the on position, the engine will start when jumped.

(5) PCM - This involves taking a resistance reading between the ground side of the starter relay and ground. (The PCM provides the ground side of the starter realy). If the resistance is high, the PCM could be bad.

There are other checks that a professional would do, but this should get you started.

Lou Braun
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Old 09-12-2010, 08:40 AM
 
 
 
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