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Old 01-22-2011, 03:43 PM
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Thumping when idling

Ok guys new to the powerstroke but I'm loving it. I got a 08 6.4 and I've noticed when I'm setting in park idling or in drive just setting there is a thumping sound coming from what I can tell from up under the motor or somewhere in that area. I counted it and it does it about every 30 seconds is this a normal thing. I've only had the truck for about a week it has 72000 miles on it other then that I love this thing. Any help would be greatly appreciated Thanks
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Old 01-22-2011, 03:58 PM
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Question

I just bought a 08 and it's doing the same thing? First I thought it was beneath and behind the driver but it's louder after a couple of weeks and it sounds like it's under the hood?
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Old 01-22-2011, 04:03 PM
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It sounds like something is slamming closed or something like
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Old 01-24-2011, 10:53 AM
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I used to have the same problem before,and the cause was my ac/defroster. I got this info from car repair:"AC compressor cycling causes the thump sound and since the power steering/hydroboost pump is on the same serpentine belt you may feel it in the steering wheel or even the brake pedal."

try to turn off your climate control completely and see if it goes away. Open the hood to check the noise and it is the AC clutch cycling. Turning it all off makes it go away. I have also heard a single thump just prior to or shortly after startup. This one is supposed to be a door closing somewhere in the climate control.
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Old 01-24-2011, 12:48 PM
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That seems like what it is. So is this something that can be fixed or is it just something its going to do just wondering if its something I need to look into getting fixed
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Old 01-25-2011, 04:18 AM
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I have an 08 and i also hear that same suttle thump. Like something slid in the tool box or something. What Jackjroadster said makes alot of sense to me and sounds normal. Most new cars cycle the air conditioning on your defrosters. For two reasons. 1.) Some how it helps it defrost faster. 2.) The free-on in the AC system lubicates the lines and seals. When you go a whole season or two without ever turning on your ac. Your lines and seals will start to dry out thus degrading your A/C.
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