Need help please. Stranded on the road.
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
If it happens again, make sure to monitor RPM, ICP psi, ICP duty % (IPR) and battery voltage while cranking.
On the 42 pin connector, also check the wires coming out of the back of the box. That's where my short was.
Be sure to listen to if the fuel pump is coming on with the key or if any dash lights don't work as normal. If no fuel pump when the key is first turned on, and the fuel bowl heater fuse has been checked and heater unplugged, leave the key on and wiggle every single wiring harness you can see under the hood. If you wiggle a wire and hear the fuel pump kick on, you've likely found your issue.
On the 42 pin connector, also check the wires coming out of the back of the box. That's where my short was.
Be sure to listen to if the fuel pump is coming on with the key or if any dash lights don't work as normal. If no fuel pump when the key is first turned on, and the fuel bowl heater fuse has been checked and heater unplugged, leave the key on and wiggle every single wiring harness you can see under the hood. If you wiggle a wire and hear the fuel pump kick on, you've likely found your issue.
Elder User
Joined: Sep 2011
Posts: 979
Likes: 4
From: Vancouver
One more thing to consider--sensors internally have somewhat flaky ways of terminating the small electronic parts to that wire harness. Rapping on them can make or break a circuit that is already faulty from poor quality design or construction in the factory. Metal fatigue, poor quality assurance, etc. can play a role. Certainly the IPR with its mechanical parts is the most likely, but there is no guarantee since you rapped on several components. Some manufacturers vibration and function test a certain % of their parts, but not all do.
Larry
Larry
It's a Van Gogh
Joined: Feb 2010
Posts: 7,815
Likes: 1,336
From: Elk Grove, CA
Be sure to listen to if the fuel pump is coming on with the key or if any dash lights don't work as normal. If no fuel pump when the key is first turned on, and the fuel bowl heater fuse has been checked and heater unplugged, leave the key on and wiggle every single wiring harness you can see under the hood. If you wiggle a wire and hear the fuel pump kick on, you've likely found your issue.
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
If there's a short to ground in the harness, it's causing the pcm to turn the fuel pump on. No need to cycle the key. When the right wire is wiggled, the PCM will engage the fuel pump for 20 seconds starting then.
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Fleet Mechanic
Joined: Apr 2011
Posts: 1,441
Likes: 6
From: Marseilles IL
Thanks for all the great advice. While I was having the no start I had full fuel pressure and fuel in the bowl at all times except when the fuel pump times out witch is normal. I did get an IPR from Clay this week just in case. I will be working on my truck tomorrow in an effort to figure out what the true issue is.
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bigblock427
1999 - 2003 7.3L Power Stroke Diesel
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Dec 19, 2003 10:03 AM
