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Varying RPM's Posted By: Firebirdjunky On: 03-20-2010 @ 15:47:25 Reply | Edit When i am driving on the interstate at 70 mph the car should be around 1950 rpm. But after the car warms up the rpms jump to about 2200. If i hit the gas they drop back down but the second i level the throttle back out they go back up what could cause this. Posted By: Storn On: 07-15-2007 @ 18:43:52 Reply | Top | Edit ok, well, so its an automatic... what i check real quick just for s&g is whether or not your brake lights aren't on,if they are, it means your brake switch is stuck, and not letting the car lock up the torque converter... also, there is a chance that it is just the torque converter clutch switch, it may be getting too hot, when the car warms up and for some reason getting too much resistance in the circuit and not letting it lock up...sort of hard to diagnose over the interweb... if this is not the case, then more likely than not it is the throttle position sensor, this would be more evident if you noticed it in other gears as well, such as putting it in manual low, or 2 or 3, and trying to drive with you foot at the same position on the throttle, and see if it does the same thing, if it does, then it is probably the throttle position sensor, i dont know what year your car is but most of the time that sensor is part of the electronic throttle control unit, and that isnt cheap to replace... --  2001 V6 5speed 180* thermostat, magnaflow high flow cat and cat-back... [ Edited on 07/15/2007 @ 18:46:32 ] Posted By: Jeremiah On: 07-15-2007 @ 23:42:28 Reply | Top | Edit I second the "Its an automatic" comment. -- **FOR SALE** 2005 GMC 1500HD 6.0L, dumped true duals - Flowmaster 50 series - 16.43@85.29 2006 Pontiac Grand Prix - L36 - bone stock 
"I say durka durka fuk fuk... ...fo shizzle!" --Jackie(94RedFormula) Posted By: Fury_786 On: 07-16-2007 @ 18:16:45 Reply | Top | Edit i had a similar problem with my '94 it turned out to be the $8 brake light switch -- 
2002 Camaro M5, [Whisper Lid][K&N][Flowmaster][B&M Shifter][BMR STB][SRI Panhard Bar w/boxed upper][PCMforLess tune][100 shot EFI wet kit][Pacesetter headers][SLP Line Locks][Lakewood LCA's][Poly Trans Mount][180* Thermo][No Cat][Accel Wires][Electric Cutout][Springtech 1.75" drop][fra mods][Optima Red Top (in trunk)][275-40 Sumitomos]  Posted By: Firebirdjunky On: 07-18-2007 @ 05:53:39 Reply | Top | Edit ok well for one yes it is an automatic two it is a 1999 and the TPS is built in which really sucks cause 400$ of a replacement part and it not be the problem would really piss me off. Thanks for the help Posted By: Jeremiah On: 07-21-2007 @ 01:42:41 Reply | Top | Edit i highly doubt thats the problem -- **FOR SALE** 2005 GMC 1500HD 6.0L, dumped true duals - Flowmaster 50 series - 16.43@85.29 2006 Pontiac Grand Prix - L36 - bone stock
"I say durka durka fuk fuk... ...fo shizzle!" --Jackie(94RedFormula) Posted By: Storn On: 07-21-2007 @ 21:20:10 Reply | Top | Edit it really sounds like either a brake switch, or a torque converter lockup solenoid... --
2001 V6 5speed 180* thermostat, magnaflow high flow cat and cat-back... Posted By: cleve On: 07-13-2009 @ 15:24:42 Reply | Top | Edit Mine is doing this right now have you fixed yours yet? mine is a 1998 3.8 auto, it goes back and fourth. -- cleve -- cleve [ Edited on 07/13/2009 @ 17:55:01 ] Posted By: Jim_Hogan 
On:
11-09-2009 @ 09:28:46 Reply | Top | Edit
Thread Locked By a Moderator Old Old Old post. Do not reply to a thread that is not in the first few pages. If you have to search to find it, do not post to it. http://www.fbody.com/v6/104030
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