Go Back   Ford Mustang Forums > Mustang > 5.0 Mustang > 5.0L Tech

Welcome to our Mustang forums where Mustangers come together to hang out, discuss and enjoy their favorite Mustang hobby with fellow Mustang enthusiasts. We invite everyone to read, post, and enjoy our Mustang forum as well as the many other sections of our site.

You are currently viewing our forums as a guest. By joining our community you gain access to post topics, communicate with members, upload your photos and access many other special features. Registration is fast, simple and free so why wait, join our Mustang community today! If you have any problems with registration or your account login, please contact support.

5.0 Mustangs Tech Forum

5.0L Talk | 5.0L Tech | 94-95 Tech | 1979-1993   1994   1995   Upload Pictures | Timeslips | Power Adders | Mustang Tech 


Reply   Post New Thread
Unread 11-13-2008   #1 (permalink)
fiveliterfever1 is offline Apprentice


Joined: Jan 2004
Posts: 64 Threads: 27
 fiveliterfever1's Country Flag
Portland   Oregon
fiveliterfever1 is on a distinguished road
Send a message via MSN to fiveliterfever1
Default Idle Air Control Valve testing help needed. Surging getting worse!

Hi All~
Could you guys give me some insight on the proper way to check the voltage on my 92 5.0 Idle Air Control Valve?
Over the past year, I've had an increasing surging issue upon hot or cold start ups. It does finally settle down after feathering the throttle but it's been getting worse.
I already have my TPS set at .98 so I don't believe it's that and have reset the computer as well.
Thanks

~ Mark
__________________
"HAPPINESS IS AN OFFCAMBER APEX"

92 LX 5spd Conv "Summer Special" 331cid,Track Heat intake, TFS Track Heat Heads, 75mm TB, 95mm Anderson MAF w/ 4" Power Pipe, F303 cam, 30lb inj, Aero reg, HI6, 1 3/4 full length hdrs, Xpipe, pullies, custom strut tower brace, k brace, sub conn, Steeda CC plates, KYB adj struts and shocks, Steeda Full Comp Springs(front), Steeda Sport Springs(rear),upp/low control arms, subconnectors, Steeda front swaybar, Bump Steer and Panhard Bar. 3.73's
fiveliterfever1 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Sponsored Links
Advertisement
 
Unread 11-13-2008   #2 (permalink)
stephenmeier is offline Rookie

Classic Member


Joined: Nov 2008
Posts: 17 Threads: 0
 stephenmeier's Country Flag
Carlsbad   New Mexico
stephenmeier is on a distinguished road
Default

Why dont you just replace it instead of tring to fix the old one and you can test it useing a voltameter.
stephenmeier is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 11-13-2008   #3 (permalink)
fiveliterfever1 is offline Apprentice


Joined: Jan 2004
Posts: 64 Threads: 27
 fiveliterfever1's Country Flag
Portland   Oregon
fiveliterfever1 is on a distinguished road
Send a message via MSN to fiveliterfever1
Default

I replaced it about 4k ago. I want to make sure it's getting the correct signal, and start diagnosing the different possibilities of this issue.
__________________
"HAPPINESS IS AN OFFCAMBER APEX"

92 LX 5spd Conv "Summer Special" 331cid,Track Heat intake, TFS Track Heat Heads, 75mm TB, 95mm Anderson MAF w/ 4" Power Pipe, F303 cam, 30lb inj, Aero reg, HI6, 1 3/4 full length hdrs, Xpipe, pullies, custom strut tower brace, k brace, sub conn, Steeda CC plates, KYB adj struts and shocks, Steeda Full Comp Springs(front), Steeda Sport Springs(rear),upp/low control arms, subconnectors, Steeda front swaybar, Bump Steer and Panhard Bar. 3.73's
fiveliterfever1 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 11-13-2008   #4 (permalink)
StangLX93 is offline Made Member


Joined: Jun 2008
Posts: 547 Threads: 12
 StangLX93's Country Flag  View StangLX93's 4 photos
Norton   Massachusetts
StangLX93 is on a distinguished road
Default

has it always produced this problem, or 4k ago when you replaced it, i had the same problem, turned out it was my coolant temp sensor, also makesure it clean in there, remove it inspect it, then squirt some throttle body cleaner in there for extra assurance, and how old is you TPS sensor that can cause idle problems as you described
__________________
1993 LX 5.0 stock long block, 1.7 crane roller rockers, cobra valve springs, explorer intake upgrade, 65mm throttle body, 80mm maf ,Moroso CAI,Shorty BBK headers,BBK Adj fuel reg, BBK underdrive pulleys, electric fan, B303 cam, off-road Hpipe, 40series flowmasters, 3:73 gears, Alum drive shaft, King Cobra clutch, Pro 5.0 shifter, BBK gripp LCA,190lph fuelpump,Moates Burn2 Chip Programmer, with EEC-IV bank reader
StangLX93 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 11-13-2008   #5 (permalink)
fiveliterfever1 is offline Apprentice


Joined: Jan 2004
Posts: 64 Threads: 27
 fiveliterfever1's Country Flag
Portland   Oregon
fiveliterfever1 is on a distinguished road
Send a message via MSN to fiveliterfever1
Default

It was starting to act up just before I replaced the IAC, thinking that might cure the problem. My coolant temp sensor is working fine if you're referring to the sensor that displays the water temp on the dash cluster. Is it possible that it's faulty anyways? The TPS is most likely original, but am still able to adjust it to .98volts.
__________________
"HAPPINESS IS AN OFFCAMBER APEX"

92 LX 5spd Conv "Summer Special" 331cid,Track Heat intake, TFS Track Heat Heads, 75mm TB, 95mm Anderson MAF w/ 4" Power Pipe, F303 cam, 30lb inj, Aero reg, HI6, 1 3/4 full length hdrs, Xpipe, pullies, custom strut tower brace, k brace, sub conn, Steeda CC plates, KYB adj struts and shocks, Steeda Full Comp Springs(front), Steeda Sport Springs(rear),upp/low control arms, subconnectors, Steeda front swaybar, Bump Steer and Panhard Bar. 3.73's
fiveliterfever1 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 11-14-2008   #6 (permalink)
StangLX93 is offline Made Member


Joined: Jun 2008
Posts: 547 Threads: 12
 StangLX93's Country Flag  View StangLX93's 4 photos
Norton   Massachusetts
StangLX93 is on a distinguished road
Default

im talking about the sensor on the coolant rail on the passenger side of the intake not the sender , even though you can get the TPS set .98volts dose not tell you if you have a dead spot within its travel, a realible check is hook up a digital volt meter like you were going to adjust it, slowly open the throttle plate, and observe the volt reading, your looking for abnormal volt flucuations, if it starts @ .98 and then jump around, thats your dead spot, the cheapest is the checks, and the cleaning, parts hunting with sensors gets expensive quick
__________________
1993 LX 5.0 stock long block, 1.7 crane roller rockers, cobra valve springs, explorer intake upgrade, 65mm throttle body, 80mm maf ,Moroso CAI,Shorty BBK headers,BBK Adj fuel reg, BBK underdrive pulleys, electric fan, B303 cam, off-road Hpipe, 40series flowmasters, 3:73 gears, Alum drive shaft, King Cobra clutch, Pro 5.0 shifter, BBK gripp LCA,190lph fuelpump,Moates Burn2 Chip Programmer, with EEC-IV bank reader
StangLX93 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 11-14-2008   #7 (permalink)
89BlkNotch is offline Made Member

5.0L Member


Joined: Nov 2008
Posts: 551 Threads: 26
 89BlkNotch's Country Flag
Commack   New York
89BlkNotch is on a distinguished road
Send a message via AIM to 89BlkNotch
Default

no there should be two CTS (coolant temp sensor) one for the gauges one for the ECM, if the one for the ecm is not clean it will not get a correct reading and cause problems, if you want to chance it take it out and wire brush it clean because over the years it gets that brown crap on it from coolant, if you want to be extra sure put it in water and hook up a volt ohm meter and watch the resistance change as you heat the water also consider checking your entire air induction system, filter and cleaning MAF
__________________
1989 Ford Mustang LX Notchback,5.0L 5 speed
331 Stroker wuth forged eagle rotater, Scorpion roller rockers, mahle forged pistons, AFR185s,Spec Stage 2+ Clutch,Steeda Sub Frame Connectors with Seat supports,Hurst Short Throw Shifter, Mr. Gasket Hi0-Flo 180* T-Stat,Lunati VooDoo Series cam,Trickflow upper and lower intake,BBK CAI,BBK Long Tube Headers,BBK Off-Road H-Pipe,Flowmaster 40 Series Mufflers,Aluminum Driveshaft,17" Cobra R's,10000K HID's
One problem after the next !!
89BlkNotch is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 11-14-2008   #8 (permalink)
spdjnky_42 is offline Top Dog

5.0L Member


Joined: Nov 2007
Posts: 13,639 Threads: 204
 spdjnky_42's Country Flag  View spdjnky_42's 21 photos
St.Louis   Missouri
spdjnky_42 is on a distinguished road
Send a message via Yahoo to spdjnky_42
Default

The temp sensor is behind the temp switch that you are thinking of.
spdjnky_42 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 11-14-2008   #9 (permalink)
Joel5.0 is offline GT Member

5.0L Member


Joined: Oct 2005
Posts: 1,027 Threads: 4
 Joel5.0's Country Flag  View Joel5.0's HomePage
Sabana Grande
Joel5.0 is on a distinguished road
Default

You need to ID what the ECM (what controls the IAC duty cycle) is "reacting" to. Run a set of the DIY KOEO/KOER self tests, they're free, and will provide you with the info to ID the culprit(s) that could be causing the idle control problem. Also suggest to do a Base Idle Reset Procedure, setting the TPS to the mythical .98 -.999 vdc calibration will not solve anything. LUK
__________________
ACRONYMS:
LUK=Let Us Know, GL=Good Luck, LMK=Let Me Know, JIC=Just In Case, BTSTDTRT=Been There Seen That Done That Repaired That, YCYDYP=Your Car Your Dough Your Prerogative and the classic... DILLIGAS=Do I Look Like I Give A S***
1986 GT-X303 cam, 289 heads, 1.72, Holley 700cfm DP, RG 4+1 Trans.
Joel5.0 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 11-14-2008   #10 (permalink)
leecea is offline Rookie

5.0L Member


Joined: Oct 2008
Posts: 22 Threads: 5
 leecea's Country Flag
Lansdale   Pennsylvania
leecea is on a distinguished road
Default

I've been fighting a similar battle with my car. Most recently I found that it would not even start if I unplugged the IAC. I adjusted the idle screw so it would start without the IAC and now it runs from startup without such bad surging and it doesn't die when cold like it used to. However, all is not completely well. Idle is a bit high and it still surges slightly. Also getting an intermittent CEL (31 and 63 KOEO, IIRC). I'm planning on cleaning the salt/pepper connectors next, plus testing the TPS and temp sensor as described above.
leecea is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 11-14-2008   #11 (permalink)
fiveliterfever1 is offline Apprentice


Joined: Jan 2004
Posts: 64 Threads: 27
 fiveliterfever1's Country Flag
Portland   Oregon
fiveliterfever1 is on a distinguished road
Send a message via MSN to fiveliterfever1
Default

Wow you guys, this is all great info! I REALLY appreciate it!
The car has been sitting for 2 weeks and tonight when I started it up, it's really running rich more than normal.
Guess I better get at it huh.
Thanks again to everyone and will let you know what I hopefully find.

~ Mark
__________________
"HAPPINESS IS AN OFFCAMBER APEX"

92 LX 5spd Conv "Summer Special" 331cid,Track Heat intake, TFS Track Heat Heads, 75mm TB, 95mm Anderson MAF w/ 4" Power Pipe, F303 cam, 30lb inj, Aero reg, HI6, 1 3/4 full length hdrs, Xpipe, pullies, custom strut tower brace, k brace, sub conn, Steeda CC plates, KYB adj struts and shocks, Steeda Full Comp Springs(front), Steeda Sport Springs(rear),upp/low control arms, subconnectors, Steeda front swaybar, Bump Steer and Panhard Bar. 3.73's
fiveliterfever1 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 11-14-2008   #12 (permalink)
fiveliterfever1 is offline Apprentice


Joined: Jan 2004
Posts: 64 Threads: 27
 fiveliterfever1's Country Flag
Portland   Oregon
fiveliterfever1 is on a distinguished road
Send a message via MSN to fiveliterfever1
Default

So I'm checking the Coolant Temp Sensor.

The OHMS are going down as it gets warmer.

What kind of reading am I ultimately looking for??
__________________
"HAPPINESS IS AN OFFCAMBER APEX"

92 LX 5spd Conv "Summer Special" 331cid,Track Heat intake, TFS Track Heat Heads, 75mm TB, 95mm Anderson MAF w/ 4" Power Pipe, F303 cam, 30lb inj, Aero reg, HI6, 1 3/4 full length hdrs, Xpipe, pullies, custom strut tower brace, k brace, sub conn, Steeda CC plates, KYB adj struts and shocks, Steeda Full Comp Springs(front), Steeda Sport Springs(rear),upp/low control arms, subconnectors, Steeda front swaybar, Bump Steer and Panhard Bar. 3.73's
fiveliterfever1 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 11-14-2008   #13 (permalink)
fiveliterfever1 is offline Apprentice


Joined: Jan 2004
Posts: 64 Threads: 27
 fiveliterfever1's Country Flag
Portland   Oregon
fiveliterfever1 is on a distinguished road
Send a message via MSN to fiveliterfever1
Default

The one thing I did notice, when I pulled the sensor out after warming the car up, there was hardly any water in the bottom of the rail.
__________________
"HAPPINESS IS AN OFFCAMBER APEX"

92 LX 5spd Conv "Summer Special" 331cid,Track Heat intake, TFS Track Heat Heads, 75mm TB, 95mm Anderson MAF w/ 4" Power Pipe, F303 cam, 30lb inj, Aero reg, HI6, 1 3/4 full length hdrs, Xpipe, pullies, custom strut tower brace, k brace, sub conn, Steeda CC plates, KYB adj struts and shocks, Steeda Full Comp Springs(front), Steeda Sport Springs(rear),upp/low control arms, subconnectors, Steeda front swaybar, Bump Steer and Panhard Bar. 3.73's
fiveliterfever1 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 11-15-2008   #14 (permalink)
fiveliterfever1 is offline Apprentice


Joined: Jan 2004
Posts: 64 Threads: 27
 fiveliterfever1's Country Flag
Portland   Oregon
fiveliterfever1 is on a distinguished road
Send a message via MSN to fiveliterfever1
Default

Well the Coolant Sensor is good. I warmed the car to about 180 and according to the Ford Ohm chart it's fine.

The O2 sensors were clean.

The IAC was clean and set at .98 with no obvious volt fluctuations when opening the butterfly.

I have vacuum to the EGR valve, but don't know if it's sufficient. How can I check the valve itself? Should I notice obvious valve movement to the naked eye?

The plugs are a bit rich but no signs of manifold leaks.

I haven't checked the MAF for cleanliness yet but I don't I'll find anything there.

I sprayed some starter fluid around the vacuum lines but found nothing.

Did the Base Idle reset... No change.

Have not done the whole self test though.

At this point I'm really starting to get frustrated.

Geesh
__________________
"HAPPINESS IS AN OFFCAMBER APEX"

92 LX 5spd Conv "Summer Special" 331cid,Track Heat intake, TFS Track Heat Heads, 75mm TB, 95mm Anderson MAF w/ 4" Power Pipe, F303 cam, 30lb inj, Aero reg, HI6, 1 3/4 full length hdrs, Xpipe, pullies, custom strut tower brace, k brace, sub conn, Steeda CC plates, KYB adj struts and shocks, Steeda Full Comp Springs(front), Steeda Sport Springs(rear),upp/low control arms, subconnectors, Steeda front swaybar, Bump Steer and Panhard Bar. 3.73's
fiveliterfever1 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 11-15-2008   #15 (permalink)
fiveliterfever1 is offline Apprentice


Joined: Jan 2004
Posts: 64 Threads: 27
 fiveliterfever1's Country Flag
Portland   Oregon
fiveliterfever1 is on a distinguished road
Send a message via MSN to fiveliterfever1
Default

I am running a one step colder plug than is recommended for the Track Heat set-up, but it never had an ill affect before.

What is a good starting point for fuel pressure and timing for my set-up?

Basically it's running very rich without a strong idle characteristic.

After warming the car then shutting it off, then starting it back up immediatley, it just surges and wants to die.

Maybe my head needs to be examined? he he
__________________
"HAPPINESS IS AN OFFCAMBER APEX"

92 LX 5spd Conv "Summer Special" 331cid,Track Heat intake, TFS Track Heat Heads, 75mm TB, 95mm Anderson MAF w/ 4" Power Pipe, F303 cam, 30lb inj, Aero reg, HI6, 1 3/4 full length hdrs, Xpipe, pullies, custom strut tower brace, k brace, sub conn, Steeda CC plates, KYB adj struts and shocks, Steeda Full Comp Springs(front), Steeda Sport Springs(rear),upp/low control arms, subconnectors, Steeda front swaybar, Bump Steer and Panhard Bar. 3.73's
fiveliterfever1 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Sponsored Links
Advertisement
 
Reply   Post New Thread



Thread Tools



Mustang Photos
Mustang Links    Top Sites    RSS    Link To Us    Add to Favorites    Archive    Terms of Use    Site Rules    Privacy    Contact    Sponsors    Advertise   
AllFordMustangs is not affiliated with or endorsed by Ford Motor Company. ©Copyright 2002-2011 All Auto Enthusiasts Network

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162