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Senior User
Joined: Aug 2004
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From: Elk City, OK
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I am looking at trading my truck for a 2000 ford f250. It has a 7.3 in it. I spent the day working on the truck trying to get it running. The truck has sat for a couple of years. He has replaced both oil pumps and the fuel pump and replaced the injectors. Last time he worked on it they got a couple of codes that the idm was bad. We put a remaned idm, two new batteries, and a cps in it today. Truck will not start. I checked the codes and it has one for exhaust back pressure and icp sensor pressure heigher then expected with the engine off. The glow plugs are unhooked right now. He said the relay is bad. It has a full tank of diesel but it is about two years old. Any help i can get would be appriciated This is my first 7.3 and the truck is 160 miles from me it is going to be next weekend before i can make it back over to work on it.
Hotshot
Joined: Jan 2011
Posts: 18,849
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From: Puget Sound
I'd bring a lot of cans in case you need to siphon out the old fuel. One fresh can of diesel will allow you to hook a hose directly to the pump intake to see if that's the issue. You can unplug the ICP sensor to see if it's a sensor issue, but I have to wonder if that IPR isn't gummed up from sitting.
If you could get your hands on a scan gauge/tool, the last links in my signature will nail it - but those links can also help if you just have a multimeter.
If you could get your hands on a scan gauge/tool, the last links in my signature will nail it - but those links can also help if you just have a multimeter.
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Joined: Aug 2004
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From: Elk City, OK
Well sucked out the old fuel out of the truck today. Put in 20 gallons fresh fuel in truck still won't start my those said the icp pressure was 2800 pulled the valve covers to have a look cranked the motor over no oil coming out of the injectors. Found the connects were loose at both valve cover gaskets on the inside. Checked for continuity going from the idm to the to the injectors all were good. Hooked wires back up cranked over the motor gauge ice still shows 2275 and the engine will not start
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
I see no mention of battery voltage while cranking, this test would have been in the last link in my signature. A few minimums have to be met before the injectors will fire - and the lack of oil out the spouts says either the minimums are not met, your electrical connections are bad, or you may have a bad module or CPS sensor. I don't know how you tested the continuity to the injectors, but the UVCH link in my signature helps there as well.
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Senior User
Joined: Aug 2004
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From: Elk City, OK
Battery voltage was 12 volts, cps is brand new. Took the power plug off of the injector and disconnected the plug from the idm and used a multimeter with one lead at the injector and the other at the idm plug. It is possible the pressure sensor is shot and reading wrong so I am no getting enough pressure to fire off the injectors.
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