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  #1  
Old 03-10-2013, 06:10 AM
Nck's Avatar
Nck Nck is offline
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Join Date: May 2011
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Vehicle: Superb 1998 Dodge Ram
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Engine: 1998-2001 360ci (5.9L) Magnum V8 245hp(standard), 250hp(Sport package)
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Default A video to show my RPM issue.

I still haven't figured this problem out. Sorry it's upside down, I didn't realize it at the time. Sometimes it dips so low that the engine shutters. And it does this also when I let off the gas, it goes real low, or stalls out completely.
View My Video

Last edited by Nck; 03-10-2013 at 06:12 AM.
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  #2  
Old 03-11-2013, 12:28 AM
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Taylor15835 Taylor15835 is offline
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Engine: 2009-20?? 345ci (5.7L) Hemi V8 390hp 407lb/ft
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what years the truck? could be the IAC or TPS sensor.

-if you pull the IAC sensor you can clean it.

-if you pull the plug for the TPS sensor while the truck is on, the truck should have an erratic rpm (this means it should still be good. if nothing happens then its bad)

-it could also be a misfire (doubt it but worth looking into)
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Old 03-11-2013, 12:29 AM
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Taylor15835 Taylor15835 is offline
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could also be injectors. throw some sea foam through her.
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Old 03-11-2013, 04:44 AM
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Vehicle: Superb 1998 Dodge Ram
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Color: White
Engine: 1998-2001 360ci (5.9L) Magnum V8 245hp(standard), 250hp(Sport package)
Rep Power: 0
Rep:74
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My first though was the injectors. But I'll try the small things first. those two sensor's and I also heard the ignition coil could cause this. If none of those work I guess I should have the injectors checked.
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Old 03-11-2013, 07:27 AM
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Taylor15835 Taylor15835 is offline
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-ignition coils are a big thing, leads to a misfire on the cylinder, the engine will usually have a lag in response or sometimes will not starts or stall. This could vary well be due to age of the coils and or spark plugs. You can test this with a multimeter and their are many youtube videos to help you out, (removing the batter cable first! lol) I would also pull your plugs and inspect them. But I would change them anyways to eliminate them as a problem.

If this erratic idle/rpm only occurs at low rpm or when the gas/throttle is not engaged i would look at the IAC first. The IAC (idle air control) will be on the side of your throttle body, i believe on the 5.9 it was on the back of the throttle body. It should be held on by to torx screws. pull the sensor and use a TB/carb cleaner to clean the tip but be very careful, the tip should be a brass color.
- the TPS (throttle position sensor) should be on the driver side of the TB, while your at it pull the plug to the TPS while the motor is on, it should start to run erratic, if not you have a bad sensor. there are also ways of testing this with a multimeter.
- after that id look at injectors, again there are ways to test this with a multimeter to see if they are working, but as to wether or not they are actual pushing enough fuel is a little trickier.

Hope this helps a little.
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  #6  
Old 03-11-2013, 06:06 PM
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Nck Nck is offline
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Rep Power: 0
Rep:74
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Alright, so far the problem is gone. I replaced the TPS and then did a hard reset by unhooking the battery and turning the key for 20 seconds. We'll see if it stays this way.
I Appreciate the help guys.
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Old 03-12-2013, 01:23 AM
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Taylor15835 Taylor15835 is offline
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NP man good luck, hope that solved the problem.
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  #8  
Old 03-12-2013, 04:51 AM
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Nck Nck is offline
Dodge Ram Forum Senior Member!
 
Join Date: May 2011
Location: Salt Lake City
Posts: 258
Gender: Male
Vehicle: Superb 1998 Dodge Ram
Trim Level: SLT Laramie
Color: White
Engine: 1998-2001 360ci (5.9L) Magnum V8 245hp(standard), 250hp(Sport package)
Rep Power: 0
Rep:74
Nck will become famous soon enough
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Quote:
Originally Posted by Taylor15835 View Post
NP man good luck, hope that solved the problem.
I think I got lucky pulling the plug from the sensor. Because it set off the check engine light and so I had it tested and showed it was the TPS causing all the problems. But so far she runs awesome. Thanks again
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