Diesel engine rumping - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 12-17-2012, 03:30 PM Thread Starter
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Diesel engine rumping

I was wondering what may cause your diesel engine to make 2 or 3 rumping sounds when it first sarts up, and then smoothens right out. Its wierd, i go to sart it when its really cold and it starts and goes rump, rump, rump, and then idles normal. It's like I am not getting fuel when i first sart it. Any ideas, could it be the ipr sensor?

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post #2 of 6 Old 12-17-2012, 04:55 PM
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Do you understand how heui works?
First I bet you're using 15w40 oil.
so that oil is thick cold.
When firing, injector 6 fires, using the oil and fuel in the rails. The fuel can be replenished faster than the oil since the oil is so thick. Then, injector 8 tries to fire, but has too little oil and basically misfires.

I made my Samsung SGH-I997 send this.



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post #3 of 6 Old 12-17-2012, 05:59 PM Thread Starter
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I am currently using 5w40 synthetic oil. This makes me believe that maybe my IPR valve is not working right or that my oil pump is getting weak.

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post #4 of 6 Old 12-17-2012, 06:15 PM
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Shoot, proved me wrong.
I see it's tuned though. does it do it stock?



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post #5 of 6 Old 12-17-2012, 06:18 PM Thread Starter
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Yes I have it back to stock since I had the glowplugs replaced thinking this may be the problem. I might try switching it back to tow. I have never had the programmer in any other function than tow and stock.

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post #6 of 6 Old 12-17-2012, 09:02 PM
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I had the same thing but mine was 2 bad glow plugs.
it would surge hard 3 or 4 times then level off but would still have a misfire until it got a little heat in it.

Lee

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