Setting 5.0 Idle

IcantDo55 · August 28th, 2005, 01:28 AM

Idle Adjustment By Darrin Tebbe (on Corral.net)

It seems that many people have trouble with the way their 5.0 Mustang idles. Symptoms are usually a stumbling or rough idle which may be the result of modifications, or any number of other factors that may contribute to the problem. Clogged Emissions Gas Recirculation (EGR) Valves or Idle Air Bypass (IAB) solenoids are often to blame. A bad Throttle Position Sensor (TPS) will cause the engine to "hunt" for a proper idle setting. If you are experiencing idle problems first check the IAB. If it has large amounts of carbon deposits in it you may need to clean it using regular carburetor cleaner. You will have to remove it to do this, DO NOT clean it while it is on the car! If you have checked to make sure that your EGR, IAB, and TPS are clean and properly set and you are still experiencing problems try the following:
1. Clear the EEC-IV's idle memory by disconnecting the battery for 20+ minutes.
2. Disconnect the Idle air bypass solonoid
3. Reconnect battery
4. Start engine and set idle speed to desired RPM with stop screw on throttle body (900 rpm works great with E303 or larger cam)
5. Turn off engine and reconnect the air bypass solenoid*Optional -- set TPS to 0.90 - 0.95 volts (Do not exceed 1.0 volts MAKE SURE!) Use a digital volt meter!
6. Start engine and let it idle for 2 minutes with no accessories on.
7. Turn off engine for two minutes
8. Start engine again and run for 2 minutes with every accessory turned on.
9. Turn engine off again. Your computer should have now re-learned the new idle settings. This procedure assumes that you have a clean IAB valve. If it is carboned up then you may need to remove it and clean it with carburetor cleaner.

F.Y.I.:
For people that dont know you have to take off the neg. battery cable first and always put it back on last when disconecting both battery cables.

87vert · November 14th, 2005, 02:46 PM

the most recommended tps setting is .98

JERSEYTHUNDER · July 29th, 2006, 08:50 PM

great post!!

is there a post for setting the TPS on a 94' cobra?

jt

cali 5.0 · July 29th, 2006, 11:50 PM

exactly where is the stop screw on the throttle body at

stang fanatic · July 31st, 2006, 06:31 PM

underneath the throttle body

cobralini · August 1st, 2006, 03:07 PM

I disconnected the neg, pulled and cleaned the IAC. put it back and my car idles much better and seems to run smoother too. Prior to resetting the computer I had a dirty IAC, and a massive vaccum leak.

2ndChildhood · November 30th, 2006, 04:17 PM

Does this apply for 95's as well?

cali 5.0 · May 9th, 2007, 08:04 PM

Originally Posted by 87vert

the most recommended tps setting is .98

what wires do i test to get that reading? the org and black wire i got a reading of about 5v and with the org and grn wire i got a reading of about 4.03v.. so wht do i need to do to get .98v

lone5oh · August 27th, 2007, 11:44 PM

cali has asked my question do i put one lead in one wire and one in the other with a digital multimeter? and im guessing low low dc on the switch?? thanks im slow you got to work with me. take care

matt

Illuminator · September 18th, 2007, 08:48 AM

I posted awhile back requesting help with fuel pump power problems on my 89 5.0 and there were quite a few great posts that had tons of tech and ideas for troubleshooting. Well, I followed most of the posts and checked and/or replaced damn near everything including fuel pump, regulator, fp relay, computer, TFI, ig. switch, and stripped all the wiring and checked fuseable links and whatnot from one end of car to other including the inertia switc. Problem still persists, cant get power to fuel pump w/o jumping the test connector fp lead. Just was wondering if anyone else has had a similar problem, and any ideas how to fix I might have missed. Been driving for months now with the jumpered wire powering the pump with real lousy fuel mileage, also get the cel on after car warms up, varies on when it comes on tho.... Even had the o2's relocated thinking they were hitting the front crossmember with vibration, but no good on the cel there. Any help would be greatly appreciated.

SCREAMPUFF87GT · July 28th, 2010, 01:56 AM

just throwing this out there the problem may not be the positive it may be a ground??

FastStang91Lx · July 28th, 2010, 07:50 AM

Originally Posted by SCREAMPUFF87GT

just throwing this out there the problem may not be the positive it may be a ground??

Since it's been 3 years... He's prolly got it fixed by now. Newbs............

AdderMk2 · July 28th, 2010, 08:13 AM

Originally Posted by 87vert

the most recommended tps setting is .98

which is a BS myth... as long as the voltage is btween .5 and 1v, the EEC could care less what you have it set at

Digsj7 · July 28th, 2010, 01:20 PM

Originally Posted by FastStang91Lx

Since it's been 3 years... He's prolly got it fixed by now. Newbs............

LMFAO!!

August 28th, 2005, 01:28 AM	#1
IcantDo55 Enthusiast Join Date: Aug 2005 Location: Va Beach VA Posts: 590 iTrader: 0 reviews	Setting 5.0 Idle Idle Adjustment By Darrin Tebbe (on Corral.net) It seems that many people have trouble with the way their 5.0 Mustang idles. Symptoms are usually a stumbling or rough idle which may be the result of modifications, or any number of other factors that may contribute to the problem. Clogged Emissions Gas Recirculation (EGR) Valves or Idle Air Bypass (IAB) solenoids are often to blame. A bad Throttle Position Sensor (TPS) will cause the engine to "hunt" for a proper idle setting. If you are experiencing idle problems first check the IAB. If it has large amounts of carbon deposits in it you may need to clean it using regular carburetor cleaner. You will have to remove it to do this, DO NOT clean it while it is on the car! If you have checked to make sure that your EGR, IAB, and TPS are clean and properly set and you are still experiencing problems try the following: 1. Clear the EEC-IV's idle memory by disconnecting the battery for 20+ minutes. 2. Disconnect the Idle air bypass solonoid 3. Reconnect battery 4. Start engine and set idle speed to desired RPM with stop screw on throttle body (900 rpm works great with E303 or larger cam) 5. Turn off engine and reconnect the air bypass solenoid*Optional -- set TPS to 0.90 - 0.95 volts (Do not exceed 1.0 volts MAKE SURE!) Use a digital volt meter! 6. Start engine and let it idle for 2 minutes with no accessories on. 7. Turn off engine for two minutes 8. Start engine again and run for 2 minutes with every accessory turned on. 9. Turn engine off again. Your computer should have now re-learned the new idle settings. This procedure assumes that you have a clean IAB valve. If it is carboned up then you may need to remove it and clean it with carburetor cleaner. F.Y.I.: For people that dont know you have to take off the neg. battery cable first and always put it back on last when disconecting both battery cables. __________________ -Mike Link to My Site Want to Play Some Pool??? Stroked and Blown!

November 14th, 2005, 02:46 PM	#2
87vert Regular Join Date: Nov 2005 Posts: 248 iTrader: 0 reviews	the most recommended tps setting is .98 __________________ '96 Exploder XLT 5.0 AWD "turbos coming soon"

July 29th, 2006, 08:50 PM	#3
JERSEYTHUNDER Newbie Join Date: Jul 2006 Location: northern nj Posts: 28 iTrader: 0 reviews	great post!! is there a post for setting the TPS on a 94' cobra? jt __________________ 1994 MUSTANG COBRA SVT

July 31st, 2006, 06:31 PM	#5
stang fanatic Enthusiast Join Date: May 2006 Location: El Paso, Tx Posts: 855 iTrader: 0 reviews	underneath the throttle body __________________ "The gods too are fond of a joke." "If I had only known, I would have been a locksmith. "

November 30th, 2006, 04:17 PM	#7
2ndChildhood Newbie Join Date: Jun 2006 Posts: 31 iTrader: 0 reviews	Does this apply for 95's as well? __________________ 95 Mustang GT Convertible. 95 Probe GT (KLZE) 85 VW Cabby

July 29th, 2006, 11:50 PM	#4
cali 5.0 Regular Join Date: May 2006 Location: grand prairie tx Posts: 383 iTrader: 0 reviews	exactly where is the stop screw on the throttle body at

August 1st, 2006, 03:07 PM	#6
cobralini Regular Join Date: May 2006 Posts: 182 iTrader: 0 reviews	I disconnected the neg, pulled and cleaned the IAC. put it back and my car idles much better and seems to run smoother too. Prior to resetting the computer I had a dirty IAC, and a massive vaccum leak.

August 27th, 2007, 11:44 PM	#9
lone5oh Regular 1984 FORD MUSTANG GT Join Date: Aug 2007 Location: Summerville, SC Posts: 109 iTrader: 0 reviews	cali has asked my question do i put one lead in one wire and one in the other with a digital multimeter? and im guessing low low dc on the switch?? thanks im slow you got to work with me. take care matt

September 18th, 2007, 08:48 AM	#10
Illuminator Newbie Join Date: Jun 2007 Posts: 10 iTrader: 0 reviews	I posted awhile back requesting help with fuel pump power problems on my 89 5.0 and there were quite a few great posts that had tons of tech and ideas for troubleshooting. Well, I followed most of the posts and checked and/or replaced damn near everything including fuel pump, regulator, fp relay, computer, TFI, ig. switch, and stripped all the wiring and checked fuseable links and whatnot from one end of car to other including the inertia switc. Problem still persists, cant get power to fuel pump w/o jumping the test connector fp lead. Just was wondering if anyone else has had a similar problem, and any ideas how to fix I might have missed. Been driving for months now with the jumpered wire powering the pump with real lousy fuel mileage, also get the cel on after car warms up, varies on when it comes on tho.... Even had the o2's relocated thinking they were hitting the front crossmember with vibration, but no good on the cel there. Any help would be greatly appreciated.

July 28th, 2010, 01:56 AM	#11
SCREAMPUFF87GT Newbie Join Date: Jul 2010 Posts: 37 iTrader: 0 reviews	just throwing this out there the problem may not be the positive it may be a ground?? __________________

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Posted By	For	Type	Date
SMR Forums • View topic - Wild Idle	This thread	Refback	February 18th, 2010 01:54 PM
A definitive solution to stumbling, hesitating, backfiring on acceleration? - Page 2 - Ford Mustang Forums	This thread	Refback	March 7th, 2009 05:30 PM
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It's Finally Alive!! But need help with idle - Corral Forums	This thread	Refback	November 23rd, 2008 09:38 AM
A definitive solution to stumbling, hesitating, backfiring on acceleration? - Page 2 - Ford Mustang Forums	This thread	Pingback	January 9th, 2008 01:11 PM

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