quake101
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« on: March 19, 2008, 07:45:29 AM » |
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I've had this problem for a while now and I would like to have it fixed for summer. When my mustang is cold it does not like to idle, in fact I have to "keep it running" by revving it over and over for around 2-3 minutes before the stang will idle on its own. Once warm the stang runs great, never dies at idle or stop lights. I can shut it off let it sit for a while and start it right back up and she will idle. It's only a problem if the motor is cold. I have tried (and I might be doing it wrong) to check the TPS Voltage but got nothing. Please help me out here.  |
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BadAndy
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« Reply #1 on: March 19, 2008, 07:53:42 AM » |
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How old are the O2 sensors? Condition of the wiring?
Mine does the same thing but it's because the O2s are old as hell and I have long tube headers.
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quake101
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« Reply #2 on: March 19, 2008, 07:57:55 AM » |
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How old are the O2 sensors? Condition of the wiring?
Mine does the same thing but it's because the O2s are old as hell and I have long tube headers.
The O2 sensors are "new" and they came with my x-pipe when I bought it. I would think they are good but I haven't (nor know how to) tested them. |
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BadAndy
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« Reply #3 on: March 19, 2008, 07:58:48 AM » |
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How are you checking the TPS voltage? What brand O2s are they? Have you checked the wiring of the O2s to make sure they aren't broken?
What is your timing set at?
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Gravel
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« Reply #4 on: March 19, 2008, 08:10:17 AM » |
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I don't see the O2's causing a cold run problem, the system is running in closed loop during cold run. You could have an IACV that is failing, does the idle change appropriately when you fire up the AC when warm? I would be inclined to verify the temp sensor is also working properly.
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BadAndy
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« Reply #5 on: March 19, 2008, 08:13:12 AM » |
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O2s have caused this same problem on two of my Mustangs.
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quake101
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« Reply #6 on: March 19, 2008, 08:14:27 AM » |
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How are you checking the TPS voltage? What brand O2s are they? Have you checked the wiring of the O2s to make sure they aren't broken?
What is your timing set at?
I was trying to check the TPS voltage with a multi-meter by probing the wires, I never did get a reading off it and I'm really not sure I was doing this correctly. The O2s came with the x-pipe and I believe the brand was doctor gas or something. I have checked the wiring and even followed it as far as I could see and the wiring looks great. Here is a link to my x-pipe, if you click on the image you can see the O2s. http://www.badassmustangs.com/forums/garage.html;sa=view_modification;VID=1;MID=20The timing is set at 14, if I remember correctly. I have tried to bump it down a little with no success so I put it back. |
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quake101
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« Reply #7 on: March 19, 2008, 08:17:18 AM » |
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I don't see the O2's causing a cold run problem, the system is running in closed loop during cold run. You could have an IACV that is failing, does the idle change appropriately when you fire up the AC when warm? I would be inclined to verify the temp sensor is also working properly.
I removed the AC from the car, so I don't know if it does anything when the AC is switched on. |
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BadAndy
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« Reply #8 on: March 19, 2008, 08:18:08 AM » |
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The only way I've been able to check the TPS voltage correctly was by cutting just the cover of the green wire (I think that was the right one) so I could touch the + probe to the wire and then touching the - probe to a ground.
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quake101
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« Reply #9 on: March 19, 2008, 08:42:12 AM » |
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I'll test a few things tonight.
TPS Voltage is .98-.99 volts, correct?
I'll also check the temp sensor.
ICAV is a $60 part at autozone. Is there anyway to test it first?
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NUTTSGT
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« Reply #10 on: March 19, 2008, 03:39:23 PM » |
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Joe, I called my buddy and left him a message. He should call me back tonight or tomorrow.
As far as the Iacv, try pricing one at NAPA too, if you have one close. You may just find out it's cheaper there.
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Don't race it if you're afraid to break it.
My wife is a Dispatcher, she tells me where to go .....and gets paid for it.
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quake101
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« Reply #11 on: March 20, 2008, 07:34:17 AM » |
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I was unable to find the time to work on the stang last night. I have Friday off, 3 day weekend, woohoo. I should be able to test these things this weekend.
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quake101
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« Reply #12 on: March 20, 2008, 05:20:44 PM » |
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I tested the TPS (got a good reading this time) and it was at .95 volts so I set it to .99 volts. I took the mustang out for a spin and it seems to run great when warm, just like before. I'll start it up tomorrow and see how well it idles now.
As for the temp sensor, it was jumping around a lot and I don't know if I got a good reading off it. I ended up cleaning it plug and I may just replace it.
Any ways I'll test it again tomorrow and keep you guys updated.
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ELB 1
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« Reply #13 on: March 20, 2008, 07:24:41 PM » |
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If you have some carb and choke cleaner spray the IAC out first.
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"The beauty of the Second Amendment is that it will not be needed until they try to take it."
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David Claflin
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« Reply #14 on: March 22, 2008, 06:28:15 PM » |
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TPS voltage really doesn't matter as the computer does it's baseline when it starts up. When I set mine I make sure it's below .96 and haven't messed with it in years. When it starts up it is in open loop for the first 90 seconds or so until the O2's and water get up to a certain temp and then it'll switch to closed loop. The O2's are being utilized the parameters for operation are a lot looser in open loop. Do you have longtubes or egual length shorty headers?? Do you still have the stock injectors or have you moved up to a larger size. You're idle with the IAB disconnected should be about 150 RPM below what you're desired idle speed is. If you've got a cold air kit on the car those have been known to mess up the MAF reading at times as well. I just had a crazy idea to look in you garage to see what you have.  I'll bet your idle is bumpy with that cam. Is that mass air meter calibrated for open element air filter?? I had similar problems when I first got my LX, it wasn't long before I got a Pro-M and no longer have those issues. |
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« Last Edit: March 22, 2008, 06:36:29 PM by David Claflin »
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If an American is to amount to anything he must rely upon himself, and not upon the State; he must take pride in his work, instead of sitting idle to envy the luck of others. He must face life with resolute courage, win victory if he can, and accept defeat if he must, without seeking to place on his fellow man a responsibility which isn't theirs-TR
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quake101
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« Reply #15 on: June 12, 2008, 09:02:46 AM » |
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So ya, I know it's been a while but I think I found my problem today.... Anyone remember this thread: http://www.badassmustangs.com/forums/general_mustang/progress_on_the_stang_v2-t4719.0.htmlLook for Also, Where does this plug into... I never did find what that plugs into..... I would be inclined to verify the temp sensor is also working properly.
So I was looking at autozone's website to find a replacement temp sensor and just replace it because it's a cheap part, when I look at the install diagram and I'm like, wtf I don't remember that...  I'll have to check this out when I get home, but I have a good feeling that plug never found a home... |
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Gravel
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« Reply #16 on: June 12, 2008, 09:09:04 AM » |
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quake101
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« Reply #17 on: June 12, 2008, 10:14:55 AM » |
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I'll take some pics tonight and post them. But I believe I'm missing that elbow that gravel posted.
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David Claflin
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« Reply #18 on: June 12, 2008, 02:25:09 PM » |
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If it is a fox body it is not in the location on the pic, leastwise mine aren't. I think that pic is from a car as the upper intake manifold is backwards. Foxes have them on the tube that goes to the heater core.
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If an American is to amount to anything he must rely upon himself, and not upon the State; he must take pride in his work, instead of sitting idle to envy the luck of others. He must face life with resolute courage, win victory if he can, and accept defeat if he must, without seeking to place on his fellow man a responsibility which isn't theirs-TR
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quake101
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« Reply #19 on: June 12, 2008, 03:18:17 PM » |
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David,
can you take a pic of the wiring around your temp sensor please? I would like to know where this plug goes and/or if I need it. I'm going to test the temp sensor tonight and see if I'm getting good reading off it.
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David Claflin
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« Reply #20 on: June 12, 2008, 06:38:48 PM » |
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If an American is to amount to anything he must rely upon himself, and not upon the State; he must take pride in his work, instead of sitting idle to envy the luck of others. He must face life with resolute courage, win victory if he can, and accept defeat if he must, without seeking to place on his fellow man a responsibility which isn't theirs-TR
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quake101
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« Reply #21 on: June 12, 2008, 07:07:28 PM » |
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Yes, I've already seen that diagram and I can't figure out what that plug is....
btw, that same diagram is hosted here.
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quake101
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« Reply #22 on: June 13, 2008, 06:35:28 AM » |
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Ok, I tested the temp sensor last night and found that it was giving very low readings according to this chart: http://fordfuelinjection.com/?p=28So I bought a new one and replaced the temp sensor. I have yet to test the cold idle because the motor was already up to temp. I plan on doing more testing tonight.  |
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Gravel
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« Reply #23 on: June 13, 2008, 08:24:32 AM » |
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With the readings you were having and the ones you are now getting, I have no doubt you fixed A problem, now we just gotta see if it was THE problem...  |
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David Claflin
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« Reply #24 on: June 13, 2008, 08:14:16 PM » |
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Sorry, forgot about the pic tonight.
Are you saying you have a plug that is not connected to anything??
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If an American is to amount to anything he must rely upon himself, and not upon the State; he must take pride in his work, instead of sitting idle to envy the luck of others. He must face life with resolute courage, win victory if he can, and accept defeat if he must, without seeking to place on his fellow man a responsibility which isn't theirs-TR
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David Claflin
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« Reply #25 on: June 14, 2008, 08:36:44 AM » |
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Here are the pics, the one connector you can see goes to the coolant temp sensor the other closer to the oil fill neck is for the evaporative canister solenoid. let me know if you need anything else.   |
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If an American is to amount to anything he must rely upon himself, and not upon the State; he must take pride in his work, instead of sitting idle to envy the luck of others. He must face life with resolute courage, win victory if he can, and accept defeat if he must, without seeking to place on his fellow man a responsibility which isn't theirs-TR
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quake101
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« Reply #26 on: June 15, 2008, 02:12:36 PM » |
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Sorry, forgot about the pic tonight.
Are you saying you have a plug that is not connected to anything??
Yes, I haven't found where that damn thing plugs into yet. Where does this plug, plug into:
  Pump002.jpg (162.56 KB. 1024x768 - viewed 60 times.) |
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David Claflin
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« Reply #27 on: June 15, 2008, 03:11:21 PM » |
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There is a solenoid above the evap canister in the bottom front right of the engine bay. If it is there it should be below where the stock air filter box sits.
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If an American is to amount to anything he must rely upon himself, and not upon the State; he must take pride in his work, instead of sitting idle to envy the luck of others. He must face life with resolute courage, win victory if he can, and accept defeat if he must, without seeking to place on his fellow man a responsibility which isn't theirs-TR
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quake101
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« Reply #28 on: June 15, 2008, 07:52:32 PM » |
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Ahhhh, I removed my A/C. I don't think I need it...  I picked up a big side job this weekend and didn't have time to test the new temp sensor, I hope I have time tomorrow to test it. |
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quake101
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« Reply #29 on: June 16, 2008, 02:55:11 PM » |
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Well, I just tested it and, still not idling when it's cold. The new temp sensor is getting better reading but it's still low. I wonder if one of my coolant lines is clogged or something. hrmmm |
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« Last Edit: June 16, 2008, 02:57:40 PM by quake101 »
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