Changed glow plugs now running rough? - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 01-09-2013, 07:35 PM Thread Starter
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Question Changed glow plugs now running rough?

I traded for a 2000 f350 6-speed the other day. The guy indicated that he had a new set of glow plugs but they needed to be installed. So after checking the relay to make sure, I went ahead and changed them out tonight. Now it starts great but it's running really rough. Almost like its only running on half of the cylinders. I'm sure I plugged everything back up. All I had to disconnect was the main plug on the drivers side valve cover, and the 2 plugs attached to the dip stick bracket going to the a/c and the rubber line going from the intake to the sensor module thing near the heater hoses on the passenger side. I re-installed everything so the only other thing I can think of is maybe I bumped some other sensor or something causing the rough idle.

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post #2 of 13 Old 01-09-2013, 07:36 PM
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I bet there are some UVCH wire or connectors loose.


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post #3 of 13 Old 01-09-2013, 07:39 PM Thread Starter
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I hope that doesn't stand for Under Valve Cover something

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post #4 of 13 Old 01-09-2013, 07:47 PM
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under valve cover harness


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post #5 of 13 Old 01-09-2013, 07:52 PM Thread Starter
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Well I hope that's not the case. What a brilliant idea putting a wiring harness under each valve cover -_-

Also, there's no CEL on but I hooked the diagnostics up to it just for kicks. The only thing it's throwing out is P0603 - PCM Processor Keep Alive Memory (KAM) Error

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post #6 of 13 Old 01-10-2013, 03:41 AM Thread Starter
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So what all does the UVCH control? I know glow plugs and injectors. All of the new glow plugs seem to be doing fine but if I had an injector unplugged, wouldn't it throw a code?

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post #7 of 13 Old 01-10-2013, 07:52 AM
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you have to have a harness under the cover for gp's and injectors, like you said.
There might be one side of it not plugged in well outside the cover.
Usually it'd throw a code.

I made my Samsung SGH-I997 send this.


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post #8 of 13 Old 01-10-2013, 07:56 AM
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Quote:
Originally Posted by jesilvas View Post
I bet there are some UVCH wire or connectors loose.
That's where my money is.

I would try and get a scanner to find out which bank has the bad connection and do the 50 cent mod while I was at it. Actually I'd pull both sides off again and do the 50 cent mod on both .
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post #9 of 13 Old 01-10-2013, 11:55 AM Thread Starter
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Ok well at least I know the procedure for removing the valve covers now so it shouldn't take me as long as It did the first time. I'm still hopeful that it's just an unplugged harness outside of the VC's or something. If not and I do end up having to dive into this again is there anything else I need to do while I'm in there? I read somewhere to check the torq on the rocker arm and injector brackets. I'll do that and the 50 cent mod but if there's anything else I should do or look for please let me know. I don't really want to take off all of this stuff 3 times in one week.

Also the only code I'm throwing is

P0603 - PCM Processor Keep Alive Memory (KAM) Error

Which from my understanding is from having the batteries disconnected. Thanks for the help guys.

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post #10 of 13 Old 01-10-2013, 01:48 PM
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Yep, that code is pretty usual, nothing to worry about.

Do the 50 cent mod and I wouldn't worry about anything else.
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glow plugs , module , relay , rough idle , sensor

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