Erratic RPM in Idle

mechwife · March 2nd, 2007, 12:04 PM

2006 V6. In neutral when nearing a stop (and even after stopping) RPMs surge to up to 2500. This is with foot on the brake only. Pushing in the clutch stops the surge. Release of the clutch sometimes allows it to surge again. It's like I'm giving it gas when I'm sitting still without my foot on the gas pedal. I've had the whole throttle body replaced (which I guess would rule out IAC or TBS), something having to do with a possible vac leak, and I believe a switch on the gas pedal was replaced too. Was told my a Ford Engineer that this is normal. How can 2500 RPMs while sitting at a stop light or chugging along in 1st and 2nd gear in traffic (requiring constant clutch engagement to lower RPMs) be normal??? One last ditch effort is a switch on the clutch, part should be coming in today. If this deesn't work, they are officially going with the "its normal." How convenient. Anyone have any suggestions?

06stang1/2gas · March 23rd, 2007, 03:50 PM

The trottle body needs changed , my 06 had the same problem and they changed it now it only go up to 1500 when stoping.

cristo · March 23rd, 2007, 05:20 PM

u can try getting the throttle body cleaned. that or it might be ur IAC sensor. i think thats what it is.. idle air control sensor.. someone can correct me if im wrong.

cristo · March 23rd, 2007, 05:21 PM

oops.. just noticed its an 06 were talking about.. either way that doesnt sound right. if ur still under warranty id take it ford maybe.

breakout831 · March 25th, 2007, 11:22 PM

I talked to this with my dealership technician. When moving and the car is in neutral (on a muanual), the rpms may come up as the idle sensor is still not engaged. He said something about the engine coming up in rpms like that so the engine can still breathe. Maybe someone can elaborate on this because I asked about this several months ago, and don't remember to a t what he said. So based upon that, your engine going up to 1500 rpms is normal.

breakout831 · March 25th, 2007, 11:22 PM

btw i have an 06 as well

dshep · April 6th, 2007, 04:16 PM

after almost running out of gas one day my rpms would surge and not go back down i disconnected the neg bat term and everything was fine

bambam88 · April 9th, 2007, 02:10 AM

i have a 01 gt 4.6 and i am having just the opposite problem sometimes when stopping it surges and the idle will go down to 500 then pulsate from there to 1300 or so it even stalls occasionally but it drives fine has good power as well sometimes it is perfectly fine...my throttle body is clean too?could my 02 sensor be the problem??? ckeck light is on and i scanned it it said bank 1 and 2 lean??? but it was doing it before the light came on.i was thinking the idle problem could be the tps being dirty.if anyone knows why it could be doing it let me know

thanks

March 2nd, 2007, 12:04 PM	#1
mechwife Look Ma! My First Post! Join Date: Mar 2007 Posts: 1	Erratic RPM in Idle 2006 V6. In neutral when nearing a stop (and even after stopping) RPMs surge to up to 2500. This is with foot on the brake only. Pushing in the clutch stops the surge. Release of the clutch sometimes allows it to surge again. It's like I'm giving it gas when I'm sitting still without my foot on the gas pedal. I've had the whole throttle body replaced (which I guess would rule out IAC or TBS), something having to do with a possible vac leak, and I believe a switch on the gas pedal was replaced too. Was told my a Ford Engineer that this is normal. How can 2500 RPMs while sitting at a stop light or chugging along in 1st and 2nd gear in traffic (requiring constant clutch engagement to lower RPMs) be normal??? One last ditch effort is a switch on the clutch, part should be coming in today. If this deesn't work, they are officially going with the "its normal." How convenient. Anyone have any suggestions?

March 25th, 2007, 11:22 PM	#5
breakout831 Hardcore Enthusiast 2006 Nissan 350Z Join Date: Dec 2006 Location: Central Florida Posts: 1,096	I talked to this with my dealership technician. When moving and the car is in neutral (on a muanual), the rpms may come up as the idle sensor is still not engaged. He said something about the engine coming up in rpms like that so the engine can still breathe. Maybe someone can elaborate on this because I asked about this several months ago, and don't remember to a t what he said. So based upon that, your engine going up to 1500 rpms is normal. __________________ MM Counter-Strike Club: Founder/ Group: Co-Owner

March 25th, 2007, 11:22 PM	#6
breakout831 Hardcore Enthusiast 2006 Nissan 350Z Join Date: Dec 2006 Location: Central Florida Posts: 1,096	btw i have an 06 as well __________________ MM Counter-Strike Club: Founder/ Group: Co-Owner

April 6th, 2007, 04:16 PM	#7
dshep Regular Join Date: Mar 2007 Posts: 64	after almost running out of gas one day my rpms would surge and not go back down i disconnected the neg bat term and everything was fine __________________ 2001MustangGTCoupeYelloww/SatinBlack*3.73Gears AuburnLSDBBKColdAirIntakeBBKCaster/CamberPlates EibachMACCatbackMACO/RHpipeSportlineSprings SteedaTimingAdjusterSteedaUpperADJ.ControlArms SteedaShocksSteedaShortThrowShifter SuperiorAxles

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March 23rd, 2007, 03:50 PM	#2
06stang1/2gas Look Ma! My First Post! Join Date: Mar 2007 Posts: 1	The trottle body needs changed , my 06 had the same problem and they changed it now it only go up to 1500 when stoping.

March 23rd, 2007, 05:20 PM	#3
cristo Newbie Join Date: Mar 2007 Posts: 29	u can try getting the throttle body cleaned. that or it might be ur IAC sensor. i think thats what it is.. idle air control sensor.. someone can correct me if im wrong.

March 23rd, 2007, 05:21 PM	#4
cristo Newbie Join Date: Mar 2007 Posts: 29	oops.. just noticed its an 06 were talking about.. either way that doesnt sound right. if ur still under warranty id take it ford maybe.

April 9th, 2007, 02:10 AM	#8
bambam88 Newbie Join Date: Apr 2007 Posts: 3	i have a 01 gt 4.6 and i am having just the opposite problem sometimes when stopping it surges and the idle will go down to 500 then pulsate from there to 1300 or so it even stalls occasionally but it drives fine has good power as well sometimes it is perfectly fine...my throttle body is clean too?could my 02 sensor be the problem??? ckeck light is on and i scanned it it said bank 1 and 2 lean??? but it was doing it before the light came on.i was thinking the idle problem could be the tps being dirty.if anyone knows why it could be doing it let me know thanks

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