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6.0L Power Stroke Diesel 2003 - 2007 F250, F350 pickup and F350+ Cab Chassis, 2003 - 2005 Excursion and 2003 - 2009 van

Strange starting issue..

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Old Jan 4, 2010 | 08:58 AM
  #1  
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silly34
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Strange starting issue..

I am sure I have asked this before but maybe on another board. I've got an 04 6.0 that I have flashed the computer with Innovative Diesel Extreme Street tune.

When it is cold out 40* or lower the truck will not attempt to turn over when the key is turned. I usually have to wait with the key on, engine off for a minute or two before the engine will spin and start. When it does spin it starts right up.

Now that it has gotten really cold 12-20* It will take several turns of the key and about 5mins to get the truck to attempt to turn over. This time when the engine spins it will start right up but run a little rough for 30 secs or so and is blowing some white smoke (I had read where this could be because of my program I'm running).

Now if I have the block heater plugged in overnight (12* outside) go out and start it.. it starts right up just like normal and runs nice and smooth, no smoke.

Now..assuming.. the batteries are good (they have been tested, several times) what could cause the engine to not turn over until it (what it seems) is warmed up enough by the glow plugs? And what would cause the engine to continue to keep starting even though the key has been turned off (engine is not running but turning over). Maybe a relay somewhere sticking?

I am using 5w-20 synthetic, 4" off-road turbo back, and extreme street tune 420hp)

B.
 
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Old Jan 4, 2010 | 09:31 AM
  #2  
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DSMMH
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Joined: Jun 2006
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Originally Posted by silly34
I am sure I have asked this before but maybe on another board. I've got an 04 6.0 that I have flashed the computer with Innovative Diesel Extreme Street tune.

When it is cold out 40* or lower the truck will not attempt to turn over when the key is turned. I usually have to wait with the key on, engine off for a minute or two before the engine will spin and start. When it does spin it starts right up.

Now that it has gotten really cold 12-20* It will take several turns of the key and about 5mins to get the truck to attempt to turn over. This time when the engine spins it will start right up but run a little rough for 30 secs or so and is blowing some white smoke (I had read where this could be because of my program I'm running).

Now if I have the block heater plugged in overnight (12* outside) go out and start it.. it starts right up just like normal and runs nice and smooth, no smoke.

Now..assuming.. the batteries are good (they have been tested, several times) what could cause the engine to not turn over until it (what it seems) is warmed up enough by the glow plugs? And what would cause the engine to continue to keep starting even though the key has been turned off (engine is not running but turning over). Maybe a relay somewhere sticking?

I am using 5w-20 synthetic, 4" off-road turbo back, and extreme street tune 420hp)

B.
Yeah, I would bet you have a relay issue. Try this. Look in your owners manual and locate relay 307 (starter relay). Now just swap it with another similar relay and try to start the engine. If that does not do the trick, then swap relay 302 (PCM power) relay, again, with another similar relay. Doing either or both of those should get her fired up. If not, you can inspect the contacts for burnt residue and or pitting by opening the relay. Looking at the blades, just pry the tabs out and the cover will come off. It will be apparent if the contacts are burnt or pitted. There will be a black residue on the contacts. I normally remove the moving arm. Very easy to do and cleaning is a lot easier. Just take a piece of crocus cloth (very fine sand paper) or scotch bright and remove the black residue.

OBTW - Ford replacement relays are very expensive. Any DPST 30 amp relay will work. They are fairly standard. I believe you can get them at Radio Shack for about $5 to $7.

DSMMH
 
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Old Jan 12, 2010 | 11:30 AM
  #3  
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silly34
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I pulled the starter relay (took it apart) and it looks like new. I created another post about this .. but essentially my starter will just free spin and won't engage the flywheel when I try to start the truck. This just started happening a week ago or so.
 
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