Compression Ignition Addict
Join Date: Feb 2010
Location: Elk Point, Alberta
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Does it start up when it is hot? If no you have a high pressure oil leak or a problem with your ipr valve.
If not you could have a bad ficm, there are a few threads on how to check your ficm voltage, it is pretty easy.
From my stand point I would say check the ficm first even though you are getting an icp code as it is easier to check the voltage than pull your ipr valve. Ficm's will give a few different codes but usually tied to injectors but the rough running when cold makes me think ficm. An ipr valve takes some time to pull if you don't have an ipr socket, 1 3/8" with a cut out on the side, OTC makes them.
When is the last time you changed the oil?
When they changed the icp sensor did they do the pigtail too?
Also could you list the codes you are getting? What are you using to read your codes?
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