rpm surge

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rpm surge - 5/11/2008 8:34:37 AM    BoeingMan Posts: 137 Joined: 2/26/2006 Status: offline I have a 2000 4.7 ltr v8 dak.  I have a problem with my engine's rpm. As i am cruising along my rpm surges up about 300 rpm for about 4 seconds then returns to normal. It happens about once a minute. However, sometimes it doesn't do this for several minutes...but for the most part it does this regularly. This happens at about any rpm that I may be cruising at. Any ideas?? Thnaks in advance. < Message edited by BoeingMan -- 5/11/2008 8:44:23 AM > _____________________________ 2000 4X4 4.7L V8 Red Club Cab Dak Sport (hauls stuff) 2002 Triple Black Z51 6Speed Corvette Roadster (hauls ass !!) 2001 Blue Saphire Pearl w/Silver Stripes Viper GTS (will spank your ass) 1980 Black Triumph Spider 1973 Piper Cherokee 140 Post #: 1

RE: rpm surge - 5/11/2008 8:53:53 AM    varsis Posts: 1204 Joined: 10/8/2006 Status: offline Vacuum Leak some where... Sounds like a little one, and when it hits a spot it hits it. That or you are having a torque converter malfunction _____________________________ 1997 dakota v6, 31's Shift Kit, Rebuilt Tranny. Upcoming mods: 5.9L magnum engine (In progress) Headers True Dual Exhaust with x pipe. K & N Drop in Throttle Body not sure what else! (in reply to BoeingMan) Post #: 2

RE: rpm surge - 5/11/2008 9:17:03 AM    BoeingMan Posts: 137 Joined: 2/26/2006 Status: offline I did a search using the word rpm. Bunch of stuff came up but on the ram truck forum. These guys had the exact same symptoms my truck is displaying and they are saying most of the time its the TPS. If not that, then the torqe converter. But again that 95% of the time it's the TPS sensor. Could this be the same fix for a dak? By the way my truck is 4.7 ltr v8 with 32k miles and I don't think the trani fluid has ever been changed. ANybody with TPS problems if so what were your symptoms.... Anybody else? Thanks for all the replies in advance. _____________________________ 2000 4X4 4.7L V8 Red Club Cab Dak Sport (hauls stuff) 2002 Triple Black Z51 6Speed Corvette Roadster (hauls ass !!) 2001 Blue Saphire Pearl w/Silver Stripes Viper GTS (will spank your ass) 1980 Black Triumph Spider 1973 Piper Cherokee 140 (in reply to varsis) Post #: 3

RE: rpm surge - 5/11/2008 10:19:36 AM    swalinemx   Posts: 6 Joined: 5/11/2008 Status: offline My 2000 dakota 4.7 did this and also surged at idle and rpm raced when started.  Changed the tps an another sensor on the throttle body (don't remember what it was) and everything was good. (in reply to BoeingMan) Post #: 4

RE: rpm surge - 5/11/2008 10:23:20 AM    varsis Posts: 1204 Joined: 10/8/2006 Status: offline Could very well be that. I would change it. See what happens. 50 bucks isn't that much... Rather than having someone diagnose it for that. If not, I would do a tranny service after that. _____________________________ 1997 dakota v6, 31's Shift Kit, Rebuilt Tranny. Upcoming mods: 5.9L magnum engine (In progress) Headers True Dual Exhaust with x pipe. K & N Drop in Throttle Body not sure what else! (in reply to swalinemx) Post #: 5

RE: rpm surge - 5/11/2008 11:50:28 AM    DakFlOw   Posts: 19 Joined: 2/22/2008 Status: offline sounds like a Throttle Position Sensor...I had the same symptoms as what you were describing.   _____________________________ 2001 Dakota Quad Cab -K&N Filter -CAI -Flowmaster 40 series mufflers -Dual Exhaust (in reply to BoeingMan) Post #: 6

RE: rpm surge - 5/11/2008 12:20:30 PM    BoeingMan Posts: 137 Joined: 2/26/2006 Status: offline OK guys, I'll buy a TPS tomorow.  Where is it located though? ..And to the the guy, (swalinemx), that posted that he changed the tps and "another sensor" on the throttle body, what was that sensor actually caled? ANyway I'll deftinately post back with results. Thanks again. < Message edited by BoeingMan -- 5/11/2008 12:29:47 PM > _____________________________ 2000 4X4 4.7L V8 Red Club Cab Dak Sport (hauls stuff) 2002 Triple Black Z51 6Speed Corvette Roadster (hauls ass !!) 2001 Blue Saphire Pearl w/Silver Stripes Viper GTS (will spank your ass) 1980 Black Triumph Spider 1973 Piper Cherokee 140 (in reply to DakFlOw) Post #: 7

RE: rpm surge - 5/11/2008 12:37:15 PM    jonnymagnum Posts: 4423 Joined: 9/4/2005 From: ontario, canada Status: offline ya, it sounds like the TPS.  and the other sensor on the TB is called IAC (idle air control) _____________________________ 05 dodge ram daytona RCSB 4x4 hemi #5212 99 dakota 4x4 318 - sold 88 dakota 2wd 3.9 - 3.9 4bt TT diesel swap 90 dakota 2wd 3.9 rcsb 5speed (in reply to BoeingMan) Post #: 8

RE: rpm surge - 5/11/2008 1:49:52 PM    swalinemx   Posts: 6 Joined: 5/11/2008 Status: offline yep that was it.  the   IAC (in reply to jonnymagnum) Post #: 9

RE: rpm surge - 5/13/2008 8:19:45 PM    BoeingMan Posts: 137 Joined: 2/26/2006 Status: offline Have been busy and haven't had the time to purchase the TPS. Noticed today that it didn't surge much if at all today. As soon as I get the chance to make the purchase I will post with results. Where is the sensor located?? Thanks in advance   _____________________________ 2000 4X4 4.7L V8 Red Club Cab Dak Sport (hauls stuff) 2002 Triple Black Z51 6Speed Corvette Roadster (hauls ass !!) 2001 Blue Saphire Pearl w/Silver Stripes Viper GTS (will spank your ass) 1980 Black Triumph Spider 1973 Piper Cherokee 140 (in reply to swalinemx) Post #: 10

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