5.0 Base Idle Reset

TurboLX · December 1st, 2007, 11:58 AM

Base Idle Reset Procedure

1. Clean TB with carb cleaner and nylon brush (toothbrush size). Engine off, fully open TB blade and spray/brush TB until all gunk and oil residue is cleaned.

2. Allow to dry, or close TB blade and start engine until it clears all carb cleaner fumes/liquid.

3. Let engine idle...if it doesn't, increase idle speed via TB stop screw until engine stays idling on its own.

4. Disconnect IAC valve, if engine dies repeat 3 with IAC disconnected.

5. Set idle speed to the lowest setting possible between 650-850 rpms with IAC disconnected. It is key to use the lowest possible to prevent idle surge, rolling, etc once the IAC is connected as follows.

6. Turn engine off, and reconnect IAC

7. With Ign On Eng Off, check TPS voltage output....if it's between .8vdc - 1.0vdc, it's OK. This voltage check should be done between the Green and Black wires at the TPS side connector as shown in the pic below (FYI: Green = TPS Signal, Black = SIGRTN, and Orange = VREF)....(-) terminal of the DVOM on the Black wire and (+) terminal on the Green wire.

8. Disconnect battery (-) for 3-4 minutes.

9. Reconnect battery, start engine, allow it to idle for 2-4 minutes to confirm setup,

10. If idle speed falls too low or stalls, increase idle speed via the TB set screw a little at a time.

11. Turn engine off for 20 seconds, re-start engine and repeat 9 - 11 if required.

12. Reconfirm TPS output is within the .8vdc - 1.0vdc range optimum range.

NOTES:

1. No need to reset ECM KAM (reset computer), the TPS minimum value used for idle control, is reset automatically by the EEC-IV every time the ign is cycled on-off for 20 seconds-on.

2. If the TPS output is within 6vdc - 1.1vdc, it's still acceptable, since no TPS failure codes will be generated, and it falls within the EEC-IV .5vdc - 1.19vdc working range.

13. Allow a 10-20 minute "relearning" period under normal driving conditions (drive cycle).....you're done!

As original from Joel5.0 of index

patwrecked · December 7th, 2007, 03:16 PM

make sure also to make sure your timing is correct. playing with the idle speed can effect when you reach full advance

Mustero · January 7th, 2008, 12:35 PM

If all that still doesen't help try adding Ford part number F2PZ-9F939-A. This is a factory ford "Engine Idle Air Kit" That gives you additional adjustment range in your Idle speed without changing throttle angle.

MustangSallee · January 14th, 2008, 11:37 AM

I know that this post has probably been here a while but I would still like to say that it is extremely useful and I appreciate it being here for reference. Also I would like to add on 94-95 models the TB screw isn't a screw but a stud. I suggest to avoid hurting the threads on it with a set of pliers or something else trying to adjust it, but instead grab a hack saw and gut a small groove in the top [deep enough not to strip] and use a flat-head screwdriver like you normally would on it. Worked like a charm for me, it may take some penetrating oil if the stud/screw is seized up. Just though I would put my 2¢ in

fastest-stang-round · January 22nd, 2008, 11:06 AM

yea u wana makesure to do that!

TKOTLARZ · February 24th, 2008, 07:48 AM

question..i got a 94 gt and i just replaced the iac and the tps and cleaned the throttle body and my idle is all screwed up it idles really high, but i think i gotta fix this fuel problem first..but what if you just cleaned it, put a new TPS and IAC on and put it back together?

omspray · March 5th, 2008, 11:36 PM

love that color

DennisChow · March 20th, 2008, 05:42 AM

O?

workhorse302 · March 30th, 2008, 05:55 PM

oh so thats why my idle is bad

Hunt_chevs · April 24th, 2008, 02:51 AM

just did the reset,.... positive results!! wish i could get it slightly lower idle, but doesnt seem to want to....

t5mustang · August 13th, 2008, 05:28 AM

great , thanks for iofo

fastback lover · September 14th, 2008, 10:57 AM

Good info here.

jjperl · September 21st, 2008, 08:48 PM

Thanks for all the great info!

BORDEN · October 10th, 2008, 02:21 PM

i wish i woulda read this about a year ago when i had my idle problem!!!!!

91black#7 · October 20th, 2008, 04:31 PM

Good info

rocket · November 3rd, 2008, 06:40 PM

could this be part of the problem i am having, the car idles fine until i turn the air or defrost on, then it drops idle and bounces up and down, occ stalling. happens even sometimes when driving and if push clutch in, can die. If air off, runs great. Not sure what is causing it. The volts also drop with idle.

fox bodies rule · November 25th, 2008, 02:28 PM

If you have followed all of the hints above, used the idle adjustment procedure in the tech section and have determined that you still need the Throttle Air Bypass Plate (TABP air adjust spacer plate) you can get one directly from TOMCO for $22.91 plus shipping. I think that mine came to ~$30 delivered by the guy in the brown truck. It is their part number 8491. I had one on my '88 that was the Ford part and have this one on my
'90 and they are the same part only Tomco's is a lot less expensive. For you lucky stroker 347 guys and those who have a 351 or bigger, be sure and read the "idiot sheet" that comes with the plate, it is very thorough and easy to understand but you need to pay special attention to the modification for bigger displacement engines. I linked to their .jpg file of the part if you want to look at it and see just what everybody is talking about. Happy idling.
[url="http://www.tomco-inc.com/admin/ProductImages/8491.jpg"[/URL]

Gah, It's Too Hard! · January 17th, 2009, 09:15 PM

sick!

BEASTstang · January 18th, 2009, 01:25 PM

it works ,just follow instructions

aooinn · January 29th, 2009, 07:33 AM

thanks a lots

December 1st, 2007, 11:58 AM	#1
TurboLX Banned 1990 Mustang LX Turbo 9.71@141.6 mph Join Date: Oct 2006 Location: NY Posts: 8,780	5.0 Base Idle Reset Base Idle Reset Procedure 1. Clean TB with carb cleaner and nylon brush (toothbrush size). Engine off, fully open TB blade and spray/brush TB until all gunk and oil residue is cleaned. 2. Allow to dry, or close TB blade and start engine until it clears all carb cleaner fumes/liquid. 3. Let engine idle...if it doesn't, increase idle speed via TB stop screw until engine stays idling on its own. 4. Disconnect IAC valve, if engine dies repeat 3 with IAC disconnected. 5. Set idle speed to the lowest setting possible between 650-850 rpms with IAC disconnected. It is key to use the lowest possible to prevent idle surge, rolling, etc once the IAC is connected as follows. 6. Turn engine off, and reconnect IAC 7. With Ign On Eng Off, check TPS voltage output....if it's between .8vdc - 1.0vdc, it's OK. This voltage check should be done between the Green and Black wires at the TPS side connector as shown in the pic below (FYI: Green = TPS Signal, Black = SIGRTN, and Orange = VREF)....(-) terminal of the DVOM on the Black wire and (+) terminal on the Green wire. 8. Disconnect battery (-) for 3-4 minutes. 9. Reconnect battery, start engine, allow it to idle for 2-4 minutes to confirm setup, 10. If idle speed falls too low or stalls, increase idle speed via the TB set screw a little at a time. 11. Turn engine off for 20 seconds, re-start engine and repeat 9 - 11 if required. 12. Reconfirm TPS output is within the .8vdc - 1.0vdc range optimum range. NOTES: 1. No need to reset ECM KAM (reset computer), the TPS minimum value used for idle control, is reset automatically by the EEC-IV every time the ign is cycled on-off for 20 seconds-on. 2. If the TPS output is within 6vdc - 1.1vdc, it's still acceptable, since no TPS failure codes will be generated, and it falls within the EEC-IV .5vdc - 1.19vdc working range. 13. Allow a 10-20 minute "relearning" period under normal driving conditions (drive cycle).....you're done! As original from Joel5.0 of index Last edited by TurboLX : December 14th, 2007 at 10:16 AM.

February 24th, 2008, 07:48 AM	#6
TKOTLARZ Enthusiast 1994 GT Join Date: Nov 2007 Location: lake worth, Florida Posts: 975	question..i got a 94 gt and i just replaced the iac and the tps and cleaned the throttle body and my idle is all screwed up it idles really high, but i think i gotta fix this fuel problem first..but what if you just cleaned it, put a new TPS and IAC on and put it back together? __________________ TwistedWedgeHds,CompCam,Rockers,Springs,Rods,Valve s,HollySys.2 Up/Low Manifold, Coil,wires,F.R. Hders,F.M. X-pipe,supper44's,BBkregulator,CAI,255lph,3.73, F.Length Sub.Con,Rear Up/LowControl Arms,lowered.315nitto555R

November 25th, 2008, 02:28 PM	#17
fox bodies rule Newbie Join Date: Jan 2008 Posts: 15	need a F2PZ-9F939-A TABP? If you have followed all of the hints above, used the idle adjustment procedure in the tech section and have determined that you still need the Throttle Air Bypass Plate (TABP air adjust spacer plate) you can get one directly from TOMCO for $22.91 plus shipping. I think that mine came to ~$30 delivered by the guy in the brown truck. It is their part number 8491. I had one on my '88 that was the Ford part and have this one on my '90 and they are the same part only Tomco's is a lot less expensive. For you lucky stroker 347 guys and those who have a 351 or bigger, be sure and read the "idiot sheet" that comes with the plate, it is very thorough and easy to understand but you need to pay special attention to the modification for bigger displacement engines. I linked to their .jpg file of the part if you want to look at it and see just what everybody is talking about. Happy idling. [url="http://www.tomco-inc.com/admin/ProductImages/8491.jpg"[/URL]

January 17th, 2009, 09:15 PM	#18
Gah, It's Too Hard! Newbie Join Date: Jan 2009 Posts: 4	sick! __________________ P G + K F*ck The 678

January 29th, 2009, 07:33 AM	#20
aooinn Banned Join Date: Jan 2009 Posts: 2	thanks thanks a lots

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December 7th, 2007, 03:16 PM	#2
patwrecked Regular Join Date: Feb 2007 Posts: 339	make sure also to make sure your timing is correct. playing with the idle speed can effect when you reach full advance

January 7th, 2008, 12:35 PM	#3
Mustero Newbie 1966 Mustero 12.50 Join Date: Jan 2008 Location: Northern California Posts: 40	If all that still doesen't help try adding Ford part number F2PZ-9F939-A. This is a factory ford "Engine Idle Air Kit" That gives you additional adjustment range in your Idle speed without changing throttle angle.

January 14th, 2008, 11:37 AM	#4
MustangSallee Regular 1994 Mustang 5.0 ???? Join Date: Jun 2007 Location: Lexington KY Posts: 78	I know that this post has probably been here a while but I would still like to say that it is extremely useful and I appreciate it being here for reference. Also I would like to add on 94-95 models the TB screw isn't a screw but a stud. I suggest to avoid hurting the threads on it with a set of pliers or something else trying to adjust it, but instead grab a hack saw and gut a small groove in the top [deep enough not to strip] and use a flat-head screwdriver like you normally would on it. Worked like a charm for me, it may take some penetrating oil if the stud/screw is seized up. Just though I would put my 2¢ in

January 22nd, 2008, 11:06 AM	#5
fastest-stang-round Newbie 1989 5.0 fox 11.6 Join Date: Jan 2008 Location: somewhere in so. tx Posts: 5	yea u wana makesure to do that!

March 5th, 2008, 11:36 PM	#7
omspray Newbie Join Date: Mar 2008 Posts: 5	nice car love that color

March 20th, 2008, 05:42 AM	#8
DennisChow Banned Join Date: Mar 2008 Posts: 10	O?

March 30th, 2008, 05:55 PM	#9
workhorse302 Newbie Join Date: Mar 2008 Posts: 12	oh so thats why my idle is bad

April 24th, 2008, 02:51 AM	#10
Hunt_chevs Hardcore Enthusiast 88 Gt Not Slow Join Date: Aug 2007 Location: SJ-CA, 50-ft elev. Posts: 1,627	just did the reset,.... positive results!! wish i could get it slightly lower idle, but doesnt seem to want to....

August 13th, 2008, 05:28 AM	#11
t5mustang Newbie Join Date: Aug 2008 Posts: 8	great , thanks for iofo

September 14th, 2008, 10:57 AM	#12
fastback lover Zip Your my Hero.... 1988 Mustang LX N/A Join Date: Sep 2007 Location: Arizona Posts: 861	Good info here.

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jjperl Newbie Join Date: Sep 2007 Posts: 19	Thanks for all the great info!

October 10th, 2008, 02:21 PM	#14
BORDEN Regular 91 lx convt 14.02@100 Join Date: Aug 2008 Posts: 162	i wish i woulda read this about a year ago when i had my idle problem!!!!!

October 20th, 2008, 04:31 PM	#15
91black#7 Newbie Join Date: Oct 2008 Posts: 3	Good info

November 3rd, 2008, 06:40 PM	#16
rocket Newbie Join Date: Aug 2006 Location: Ankeny, IA Posts: 34	could this be part of the problem i am having, the car idles fine until i turn the air or defrost on, then it drops idle and bounces up and down, occ stalling. happens even sometimes when driving and if push clutch in, can die. If air off, runs great. Not sure what is causing it. The volts also drop with idle.

January 18th, 2009, 01:25 PM	#19
BEASTstang Regular Join Date: Jul 2007 Posts: 274	it works ,just follow instructions

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5.0 Base Idle Reset

5.0 Base Idle Reset

nice car

need a F2PZ-9F939-A TABP?

thanks