Engine Running Rough Question
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Freshman User
Joined: Sep 2006
Posts: 47
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From: port clinton oh
Engine Running Rough Question
My truck idols rough and seems to have a miss in it at lower speeds in overdrive. I am suspecting the under the valve cover wiring harness, any suggestions or help would be appreciated if anyone else has had this problem. Is there a way to test this?
Post Fiend
Joined: Mar 2007
Posts: 26,966
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From: Texas
What CPS are you running? Do you ever get a check engine light (CEL)?
To check for UVCH issues
The connector at the valve cover has a plug on both the inside and the outside. The one on the inside is usually the one that comes loose. You can disconnect the outside plug and ohm the wires for resistance to determine which side needs to come off. The valve cover gasket is re-usable.
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 less than 2.0 Ohms
To check for UVCH issues
The connector at the valve cover has a plug on both the inside and the outside. The one on the inside is usually the one that comes loose. You can disconnect the outside plug and ohm the wires for resistance to determine which side needs to come off. The valve cover gasket is re-usable.
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 less than 2.0 Ohms
Thread Starter
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Freshman User
Joined: Sep 2006
Posts: 47
Likes: 0
From: port clinton oh
my cps had been replaced with tha gray one and i know they where causing misses so i changed it over to my spare black one about about a month ago but it seems to be missing more now and it dosn't seem to have as much power
