Idle problem?

spursguy123 · 01-26-2008, 03:32 PM

When I started up my car today I noticed it was idling rough, and my rpm dial was below 1. What could be the problem it was running fine the last time i drove it which was Wednesday. Thanks in advance.

96greengt · 01-26-2008, 03:40 PM

IAC's are known for failure on these engines... try removing it and cleaning it with carb cleaner, do the MAF as well just to keep the sensor wire clean.

spursguy123 · 01-26-2008, 03:49 PM

Okay I probably wont be able to clean it until tomorrow is it ok to drive it? And how do I clean it?

96greengt · 01-26-2008, 03:51 PM

Rather then type out how to do it, just click HERE instead.
Decent write up there.

spursguy123 · 01-26-2008, 03:54 PM

Thank you, that will help a lot. Would it be ok to drive it today until I can clean it which will be tomorrow.

96greengt · 01-26-2008, 05:07 PM

Should be.. they normally act up on first starts and cold mornings.

spursguy123 · 01-26-2008, 05:11 PM

ok thanks. How can I prevent this from happening again and why did it happened?

96greengt · 01-26-2008, 05:15 PM

Carbon build up is 80% of the cause usually, but it is also an electrical issue at times as well. You can clean it once every 15k miles for added insurance it stays clean, but when it fails electrically, there is nothing you can do. Somewhere I have a good used one, I'll have to dig it up, but it is a OEM IAC.

spursguy123 · 01-26-2008, 05:17 PM

Ok well Ill see how it goes once I clean it. I hope that will fix the problem. Ill let you know if I need that IAC. Thanks once again.

Wiked · 01-30-2008, 03:43 PM

what happened with this, I have this problem, and am down to the last thing I need to check, just havent had the time

spursguy123 · 01-30-2008, 04:08 PM

Well the next morning when I started it up it was fine. So I didn't go into cleaning the IAC but maybe you should try it if you haven't.

stangfreak · 01-30-2008, 11:42 PM

you should only clean the IAC as last attempt. this is not a clean regular thing. we tend to have a lot of hot weather in SA. so when the cold hits the IAC has to "unscrew" more than normal. which gives that temp run rough. most of the time it will fix itself. this is just like car batteries in the cold as well...

Wiked · 01-31-2008, 12:20 PM

I cleaned the IAC and replaced the PCV valve, now I am going to try to change the electronic part, cant remember what its called, but it has a sensor and two screws. It is attached to the Plenum if I remember correctly.

96greengt · 01-31-2008, 01:21 PM

TP sensor.

Wiked · 01-31-2008, 01:41 PM

THATS IT! Couldnt remember, you wouldnt happen to know what it should read when I test it with the voltometer do you?

96greengt · 01-31-2008, 03:29 PM

With it on at idle, about .90 volts and to WOT 4.5-5V

Wiked · 01-31-2008, 03:44 PM

So if its anything other than that, I should replace it? And I didnt even know you tested it while it was on the car, I figured you had to pull it off. To test it I just remove the plug and test the inside of the tp sensor?

96greengt · 01-31-2008, 03:56 PM

No, you back probe the wires. It needs to be plugged in due to the V-REF for voltage. You can ohm it, but I do not rely on ohms, voltage is a better way to test.

96greengt · 01-31-2008, 03:59 PM

Schematic ...

Wiked · 01-31-2008, 04:20 PM

ok... the schematic was supposed to show me how to do what?

01-26-2008, 03:32 PM	#1
spursguy123 Registered User Join Date: Nov 2007 Location: San Antonio Posts: 248 Trader Rating: (0)	Idle problem? When I started up my car today I noticed it was idling rough, and my rpm dial was below 1. What could be the problem it was running fine the last time i drove it which was Wednesday. Thanks in advance. __________________

01-26-2008, 03:40 PM	#2
96greengt LOL @ your mom Join Date: Feb 2007 Location: N.E. SA Posts: 8,687 Trader Rating: (22)	IAC's are known for failure on these engines... try removing it and cleaning it with carb cleaner, do the MAF as well just to keep the sensor wire clean. __________________ Built 00 Windsor engine, .20 over, 11.6:1cr, fully ported heads, Hardballer intake w/cooling mod, Scat rods, Probe pistons, Cobra crank, tri-metal Clevite race bearings, VT Stage 2 N/A cams, adjustable cam gears, Canton windage tray, MMR oil pump, Cobra pick up, 75MM Accufab t-body, Dragon plenum, JLT CAI, 24# injectors, Bassani mid lengths, mufflers & O/R X,255lph fuel pump, BBK FPR, Fidanza aluminum flywheel, AJE K-member, ARP hardware everywhere, X-Cal SCT custom tuned, 3.73's, Pro 5.0, polygraphite motor mounts, over 300+ RWHP & 320+ TQ

01-26-2008, 03:49 PM	#3
spursguy123 Registered User Join Date: Nov 2007 Location: San Antonio Posts: 248 Trader Rating: (0)	Okay I probably wont be able to clean it until tomorrow is it ok to drive it? And how do I clean it? __________________

01-26-2008, 03:51 PM	#4
96greengt LOL @ your mom Join Date: Feb 2007 Location: N.E. SA Posts: 8,687 Trader Rating: (22)	Rather then type out how to do it, just click HERE instead. Decent write up there. __________________ Built 00 Windsor engine, .20 over, 11.6:1cr, fully ported heads, Hardballer intake w/cooling mod, Scat rods, Probe pistons, Cobra crank, tri-metal Clevite race bearings, VT Stage 2 N/A cams, adjustable cam gears, Canton windage tray, MMR oil pump, Cobra pick up, 75MM Accufab t-body, Dragon plenum, JLT CAI, 24# injectors, Bassani mid lengths, mufflers & O/R X,255lph fuel pump, BBK FPR, Fidanza aluminum flywheel, AJE K-member, ARP hardware everywhere, X-Cal SCT custom tuned, 3.73's, Pro 5.0, polygraphite motor mounts, over 300+ RWHP & 320+ TQ

01-26-2008, 03:54 PM	#5
spursguy123 Registered User Join Date: Nov 2007 Location: San Antonio Posts: 248 Trader Rating: (0)	Thank you, that will help a lot. Would it be ok to drive it today until I can clean it which will be tomorrow. __________________ Last edited by spursguy123; 01-26-2008 at 03:59 PM.

01-26-2008, 05:07 PM	#6
96greengt LOL @ your mom Join Date: Feb 2007 Location: N.E. SA Posts: 8,687 Trader Rating: (22)	Should be.. they normally act up on first starts and cold mornings. __________________ Built 00 Windsor engine, .20 over, 11.6:1cr, fully ported heads, Hardballer intake w/cooling mod, Scat rods, Probe pistons, Cobra crank, tri-metal Clevite race bearings, VT Stage 2 N/A cams, adjustable cam gears, Canton windage tray, MMR oil pump, Cobra pick up, 75MM Accufab t-body, Dragon plenum, JLT CAI, 24# injectors, Bassani mid lengths, mufflers & O/R X,255lph fuel pump, BBK FPR, Fidanza aluminum flywheel, AJE K-member, ARP hardware everywhere, X-Cal SCT custom tuned, 3.73's, Pro 5.0, polygraphite motor mounts, over 300+ RWHP & 320+ TQ

01-26-2008, 05:11 PM	#7
spursguy123 Registered User Join Date: Nov 2007 Location: San Antonio Posts: 248 Trader Rating: (0)	ok thanks. How can I prevent this from happening again and why did it happened? __________________

01-26-2008, 05:15 PM	#8
96greengt LOL @ your mom Join Date: Feb 2007 Location: N.E. SA Posts: 8,687 Trader Rating: (22)	Carbon build up is 80% of the cause usually, but it is also an electrical issue at times as well. You can clean it once every 15k miles for added insurance it stays clean, but when it fails electrically, there is nothing you can do. Somewhere I have a good used one, I'll have to dig it up, but it is a OEM IAC. __________________ Built 00 Windsor engine, .20 over, 11.6:1cr, fully ported heads, Hardballer intake w/cooling mod, Scat rods, Probe pistons, Cobra crank, tri-metal Clevite race bearings, VT Stage 2 N/A cams, adjustable cam gears, Canton windage tray, MMR oil pump, Cobra pick up, 75MM Accufab t-body, Dragon plenum, JLT CAI, 24# injectors, Bassani mid lengths, mufflers & O/R X,255lph fuel pump, BBK FPR, Fidanza aluminum flywheel, AJE K-member, ARP hardware everywhere, X-Cal SCT custom tuned, 3.73's, Pro 5.0, polygraphite motor mounts, over 300+ RWHP & 320+ TQ

01-26-2008, 05:17 PM	#9
spursguy123 Registered User Join Date: Nov 2007 Location: San Antonio Posts: 248 Trader Rating: (0)	Ok well Ill see how it goes once I clean it. I hope that will fix the problem. Ill let you know if I need that IAC. Thanks once again. __________________

01-30-2008, 03:43 PM	#10
Wiked LoneStarStangs Addict Join Date: Sep 2006 Location: Somerset, Tx Posts: 5,616 Trader Rating: (2)	what happened with this, I have this problem, and am down to the last thing I need to check, just havent had the time __________________ IN LAK'ECH YUCATEC MAYAN CODE OF HONOR "I AM ANOTHER YOURSELF" Impossible Maze Game<<< Really a maze game, not the song anymore

01-30-2008, 04:08 PM	#11
spursguy123 Registered User Join Date: Nov 2007 Location: San Antonio Posts: 248 Trader Rating: (0)	Well the next morning when I started it up it was fine. So I didn't go into cleaning the IAC but maybe you should try it if you haven't. __________________

01-30-2008, 11:42 PM	#12
stangfreak It's LOUD but YOU looked! Join Date: Jan 2008 Location: San Antonio Posts: 691 Trader Rating: (1)	you should only clean the IAC as last attempt. this is not a clean regular thing. we tend to have a lot of hot weather in SA. so when the cold hits the IAC has to "unscrew" more than normal. which gives that temp run rough. most of the time it will fix itself. this is just like car batteries in the cold as well... __________________ Deep thought... Why do they call it an asteroid when it's outside the hemisphere, but call it a hemorrhoid when it's in your butt?

01-31-2008, 12:20 PM	#13
Wiked LoneStarStangs Addict Join Date: Sep 2006 Location: Somerset, Tx Posts: 5,616 Trader Rating: (2)	I cleaned the IAC and replaced the PCV valve, now I am going to try to change the electronic part, cant remember what its called, but it has a sensor and two screws. It is attached to the Plenum if I remember correctly. __________________ IN LAK'ECH YUCATEC MAYAN CODE OF HONOR "I AM ANOTHER YOURSELF" Impossible Maze Game<<< Really a maze game, not the song anymore

01-31-2008, 01:21 PM	#14
96greengt LOL @ your mom Join Date: Feb 2007 Location: N.E. SA Posts: 8,687 Trader Rating: (22)	TP sensor. __________________ Built 00 Windsor engine, .20 over, 11.6:1cr, fully ported heads, Hardballer intake w/cooling mod, Scat rods, Probe pistons, Cobra crank, tri-metal Clevite race bearings, VT Stage 2 N/A cams, adjustable cam gears, Canton windage tray, MMR oil pump, Cobra pick up, 75MM Accufab t-body, Dragon plenum, JLT CAI, 24# injectors, Bassani mid lengths, mufflers & O/R X,255lph fuel pump, BBK FPR, Fidanza aluminum flywheel, AJE K-member, ARP hardware everywhere, X-Cal SCT custom tuned, 3.73's, Pro 5.0, polygraphite motor mounts, over 300+ RWHP & 320+ TQ

01-31-2008, 01:41 PM	#15
Wiked LoneStarStangs Addict Join Date: Sep 2006 Location: Somerset, Tx Posts: 5,616 Trader Rating: (2)	THATS IT! Couldnt remember, you wouldnt happen to know what it should read when I test it with the voltometer do you? __________________ IN LAK'ECH YUCATEC MAYAN CODE OF HONOR "I AM ANOTHER YOURSELF" Impossible Maze Game<<< Really a maze game, not the song anymore

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01-31-2008, 03:29 PM	#16
96greengt LOL @ your mom Join Date: Feb 2007 Location: N.E. SA Posts: 8,687 Trader Rating: (22)	With it on at idle, about .90 volts and to WOT 4.5-5V __________________ Built 00 Windsor engine, .20 over, 11.6:1cr, fully ported heads, Hardballer intake w/cooling mod, Scat rods, Probe pistons, Cobra crank, tri-metal Clevite race bearings, VT Stage 2 N/A cams, adjustable cam gears, Canton windage tray, MMR oil pump, Cobra pick up, 75MM Accufab t-body, Dragon plenum, JLT CAI, 24# injectors, Bassani mid lengths, mufflers & O/R X,255lph fuel pump, BBK FPR, Fidanza aluminum flywheel, AJE K-member, ARP hardware everywhere, X-Cal SCT custom tuned, 3.73's, Pro 5.0, polygraphite motor mounts, over 300+ RWHP & 320+ TQ

01-31-2008, 03:44 PM	#17
Wiked LoneStarStangs Addict Join Date: Sep 2006 Location: Somerset, Tx Posts: 5,616 Trader Rating: (2)	So if its anything other than that, I should replace it? And I didnt even know you tested it while it was on the car, I figured you had to pull it off. To test it I just remove the plug and test the inside of the tp sensor? __________________ IN LAK'ECH YUCATEC MAYAN CODE OF HONOR "I AM ANOTHER YOURSELF" Impossible Maze Game<<< Really a maze game, not the song anymore

01-31-2008, 03:56 PM	#18
96greengt LOL @ your mom Join Date: Feb 2007 Location: N.E. SA Posts: 8,687 Trader Rating: (22)	No, you back probe the wires. It needs to be plugged in due to the V-REF for voltage. You can ohm it, but I do not rely on ohms, voltage is a better way to test. __________________ Built 00 Windsor engine, .20 over, 11.6:1cr, fully ported heads, Hardballer intake w/cooling mod, Scat rods, Probe pistons, Cobra crank, tri-metal Clevite race bearings, VT Stage 2 N/A cams, adjustable cam gears, Canton windage tray, MMR oil pump, Cobra pick up, 75MM Accufab t-body, Dragon plenum, JLT CAI, 24# injectors, Bassani mid lengths, mufflers & O/R X,255lph fuel pump, BBK FPR, Fidanza aluminum flywheel, AJE K-member, ARP hardware everywhere, X-Cal SCT custom tuned, 3.73's, Pro 5.0, polygraphite motor mounts, over 300+ RWHP & 320+ TQ

01-31-2008, 03:59 PM	#19
96greengt LOL @ your mom Join Date: Feb 2007 Location: N.E. SA Posts: 8,687 Trader Rating: (22)	Schematic ... Attached Thumbnails __________________ Built 00 Windsor engine, .20 over, 11.6:1cr, fully ported heads, Hardballer intake w/cooling mod, Scat rods, Probe pistons, Cobra crank, tri-metal Clevite race bearings, VT Stage 2 N/A cams, adjustable cam gears, Canton windage tray, MMR oil pump, Cobra pick up, 75MM Accufab t-body, Dragon plenum, JLT CAI, 24# injectors, Bassani mid lengths, mufflers & O/R X,255lph fuel pump, BBK FPR, Fidanza aluminum flywheel, AJE K-member, ARP hardware everywhere, X-Cal SCT custom tuned, 3.73's, Pro 5.0, polygraphite motor mounts, over 300+ RWHP & 320+ TQ

01-31-2008, 04:20 PM	#20
Wiked LoneStarStangs Addict Join Date: Sep 2006 Location: Somerset, Tx Posts: 5,616 Trader Rating: (2)	ok... the schematic was supposed to show me how to do what? __________________ IN LAK'ECH YUCATEC MAYAN CODE OF HONOR "I AM ANOTHER YOURSELF" Impossible Maze Game<<< Really a maze game, not the song anymore