this sound like Standpipes and Dummy plugs? - Ford Powerstroke Diesel Forum

 
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post #1 of 3 Old 03-22-2013, 05:20 PM Thread Starter
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this sound like Standpipes and Dummy plugs?

had a very bad vibration at freeway speeds with Motorcraft 15w40, switched to T6 with archoil and its still there but not nearly as noticeable. It has new ficm, and starts fine when cold. hot starts always take more crank time, but was usually 1-1.5 sec or less. once in a while, hot starts take 5-7 sec, and yesterday had about a 12 sec crank to get it to start hot. (long cranks are maybe 1-2 times a week)

the dealer did the contribution thing and 1, 2, and 3 injectors were a little bit weaker than the rest of them but still normal. (all at front)

im thinking that the dummy plugs are drainging my HPO before it can fire the front injectors properly.

anyone have an opinion on this? also would STC fitting have this kind of symptoms by chance, or would it be an absolute no start?

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post #2 of 3 Old 03-22-2013, 08:12 PM Thread Starter
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Its a 2005 btw.
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post #3 of 3 Old 03-22-2013, 08:19 PM
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Since its a 2005 its easier to diagnose. Take out the ICP sensor from the pass. valve cover, put and air fitting (m12x1.5) and put shop air into it and close the IPR manually (using 12v to the sensor, or find pin 2 on plug 2 of the PCM and put that to ground). then listen for air leaks.
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