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Old 09-12-2006, 08:37 AM
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Need some guidance,please

Hey fellas, I hope I am worrying over nothing, but here goes. I have owned my 02 7.3 for a month now(61k miles). I am noticing at idle (hot or cold) that my rps will drop 100 or so every 2 seconds, and when it does it sends a "vibration" if you will , thru the cab of the truck.Vibration may be the wrong word but each time the rpms drop , its only for a split second and you get that vibration in your ears for that split second. The drop occurs and goes back to normal almost to the exact tick of the second hand on your watch. IF someone didnt know to look for this they would not think there was a problem but I see and hear it, and it hasnt done this until the last week- 10days. Any thoughts or ideas are appreciated. Thanks, Shane
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Old 09-12-2006, 09:32 AM
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How long has it been since you changed your oil?
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Old 09-12-2006, 10:26 AM
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fuel filters as well?? both oil and fuel filters can cause wierd things...
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Old 09-12-2006, 12:48 PM
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HEy guys, thanks for the reply so quick. Fuel filter, oil, air filter, tranny flush and fill, oil filter 1600 miles ago.I just left our company garage and left one of our machanics scratching his head. truck runs perfect but at idle you get the little rpm bounce and the vibration with it. Thanks again.
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Old 09-12-2006, 05:50 PM
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Honestly i have no clue....could be the IPR valve sticking just a little bit, or maybe a cam sensor glitching at idle for a brief second.....but without a scan tool to monitor things it would be almost impossible to find, it sounds like it would be difficult enough with the scan tool....
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Old 09-18-2006, 01:06 PM
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Quote:
Originally Posted by Marc View Post
Honestly i have no clue....could be the IPR valve sticking just a little bit, or maybe a cam sensor glitching at idle for a brief second.....but without a scan tool to monitor things it would be almost impossible to find, it sounds like it would be difficult enough with the scan tool....
Hey Marc, I ended up at the dealership and let the diesel tech put my truck on the computer. The "ips" injector pressure sensor reading was fluctuating the numbers from 300 -600. He said should not be dropping down that far and my computer was trying to compensate, combining for a drop in rpms and then back to normal as I described in the original post. He said it was the samr sensor they were having trouble with on the 6.0 s and he is replacing tomorrow under engine warranty. (100 ded. tho.) Does all this make any sense to you? Thanks, Shane. (I hope it does cause it makes me feel a lot better)
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Old 09-18-2006, 05:32 PM
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Hello out there>>>>>>> ( didnt know any other way to bump this up)
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Old 09-18-2006, 05:35 PM
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yea, it all makes sence, only thing i would wonder about is if it maybe isnt the ICP, if it was maybe the IPR valve sticking...but you will find out. If they are wrong, make sure to raise hell and not allow them to charge a second deductable
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Old 09-18-2006, 05:58 PM
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Quote:
Originally Posted by Marc View Post
yea, it all makes sence, only thing i would wonder about is if it maybe isnt the ICP, if it was maybe the IPR valve sticking...but you will find out. If they are wrong, make sure to raise hell and not allow them to charge a second deductable
Sorry to be so ignorant, but Im trying to learn this truck, What is the IPR and ICp. I think it all deals with injector pressure and idle control but i aint sure.
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Old 09-18-2006, 05:59 PM
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the IPR valve regulates the high pressure oil that runs the injectors. The ICP measures that oil pressure
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