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Old 10-29-2013, 06:42 PM
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Cold start isssue-Read before you say GPR

Ok folks. My truck-99.5 7.3 95,000 miles, new motorcraft glow plugs, new stancor relay installed 10 minutes ago, new UVWH (motorcraft), new injector O rings, New ICP SENSOR, DP tuner, ATS turbo housing, cold air, new batteries. This thing doesn't start for crap when its cold. I am out of ideas. The very best ,I've been able to get with my meter, on the glow plug post is 11.4. That is with the stancor. I get 12.5 at the little post when key turns on. Fuel pressure has been checked, along with the HPOP. Is this a lemon or what? Thanks John
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Old 10-29-2013, 06:46 PM
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does it blow any smoke when it finally starts? if not, you probably need injectors

some good reading here
http://www.swampsdiesel.com/files/7....Diagnostic.pdf
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Old 10-29-2013, 06:47 PM
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I had the same issue and rotella t6 made a world of difference with cold starts. the thinner oil helps the injectors unglue themselves when cold.
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Old 10-29-2013, 07:15 PM
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Yes white smoke!!! Lots of it.. And yes I am using T6 Rotella. Its doing this at 40 degrees. Geez oh man that isn't even that cold.
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Old 10-29-2013, 07:57 PM
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remove the tuner.
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Old 10-30-2013, 05:38 AM
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Fingers crossed, I think it was the relay.. I put it on last night and tried it in the dark. Yesterday temps were in the high 50's so maybe the engine wasn't cold soaked enough to need the plugs that much. Got down to low 30s last night and it fired right up this AM. Guess I jumped the gun on panic.. This thing has been a pain in the A!@.. I was going to pull the tuner today and see if the stock setting changed anything, but going to pass. Thanks John
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