Cylinder contribution problem
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Joined: Sep 2005
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Cylinder contribution problem
Hi everyone, I'm hoping you can help with a problem I'm having.
I have a '03 7.3, rebuilt about 2000k ago, replaced injectors, + am having a hard time with cold start, once started I have a fairly rough idle until warm then it settles out. Glow plug system works fine, fuel delivery + pressure fine,
cylinder contribution test varies between cyl 2, and cyls 4+6 having problem(seems to change depending on which way the wind is blowing).
I have a '03 7.3, rebuilt about 2000k ago, replaced injectors, + am having a hard time with cold start, once started I have a fairly rough idle until warm then it settles out. Glow plug system works fine, fuel delivery + pressure fine,
cylinder contribution test varies between cyl 2, and cyls 4+6 having problem(seems to change depending on which way the wind is blowing).
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
I don't know how long it takes you to pull the valve covers, but you could try using an ohm meter to check things first if you wanted to. Unplug the 9-pin connector on the outside of the valve cover and get your ohm meter out.
The 9-pin plug is wired as follows:
G G I I C I I G G
G=Glow Plug +
I = Injector +
C= Injector Common
The injectors fire with a 115VDC signal from the IDM. Do Not pierce the wires to test.
Test between "I" and "C" to test the injectors, should be less than 5.0 Ohms.
To check glow plugs Test between "G" and battery ground. Should be between 0.6 and 2.0 Ohms
It looks like you joined back in 2005, but haven't spent much time here. There's a lot of knowledge around here. You might check in every once in a while and check things out.
When you put things back together did you make sure none of the wires were going to rub against anything in there? If you get any of those moving parts rubbing on a wire it can cause problems too. Here's a link with some pics on what to look for.
https://www.ford-trucks.com/forums/2...or-wiring.html
Be sure to let us know what you find or if you need more help on this.
The 9-pin plug is wired as follows:
G G I I C I I G G
G=Glow Plug +
I = Injector +
C= Injector Common
The injectors fire with a 115VDC signal from the IDM. Do Not pierce the wires to test.
Test between "I" and "C" to test the injectors, should be less than 5.0 Ohms.
To check glow plugs Test between "G" and battery ground. Should be between 0.6 and 2.0 Ohms
It looks like you joined back in 2005, but haven't spent much time here. There's a lot of knowledge around here. You might check in every once in a while and check things out.
When you put things back together did you make sure none of the wires were going to rub against anything in there? If you get any of those moving parts rubbing on a wire it can cause problems too. Here's a link with some pics on what to look for.
https://www.ford-trucks.com/forums/2...or-wiring.html
Be sure to let us know what you find or if you need more help on this.
