Hesitation Issues

[MadStang]

alright, I'll do that tomorrow morning, before I head to work. Thanks Lee!

 

[MadStang]

okay I got lazy and didn't want to wake up earlier than I already do so I'll try the IAC reset tonight lol.

Driving to work today I turned the radio off and just listened and felt. The car is still idling roughly, at partial throttle it hiccups and you can actually hear a pop out of the exhaust when it does.. I can't for the life of me figure this out

 

[JDwhite98gt]

My car does this too but it bucks when I go Throttle-off throttle-throttle. The rpms seem to drop way to much and it tries to catch up but it cant fast enough. I'm going to try and reset the IAC also. My car will pup pup pup when idling, not smooth at all but it wont stall if I run her hard. Im subscribing to this thread for sure.

 

[MadStang]

My car does this too but it bucks when I go Throttle-off throttle-throttle. The rpms seem to drop way to much and it tries to catch up but it cant fast enough. I'm going to try and reset the IAC also. My car will pup pup pup when idling, not smooth at all but it wont stall if I run her hard. Im subscribing to this thread for sure.

you're experiencing the exact same thing as I am. if I go from on throttle to off to on it bucks, etc, etc. If I can't figure it out this upcoming weekend, I'm probably just gonna put down the cash for it to be fixed at a shop, the longer the car is running like crap the more I feel like I'm ruining the car...

 

[JDwhite98gt]

Do you ever rev match to downshift while DD'ing? Another problem I have is, if I go to rev match the car, as soon as I push in the clutch, the rpm's drop to low, it burbles like it wants to stall, but it wont...I usually have to blip the throttle twice for it to stay in the rev range. I went as far as to pull out my ecu last night to see of there was a chip in there. Nope, nothing. I changed/cleaned everything (even replaced the fuel pump) you did except change my air filter. All of my vaccum lines seem fine, no exhaust leaks, Ive been stumped for 2 years lol. I have never reset the IAC so hopefully that could be it. Someone even suggested that I had a leaky injector and it was flooding the cylinder while I was off the gas, but it doesnt seem feasable to me. My problem also gets worse depending on the humidity. Hope you can find a solution because I sure as hell cant.

 

[MadStang]

Do you ever rev match to downshift while DD'ing? Another problem I have is, if I go to rev match the car, as soon as I push in the clutch, the rpm's drop to low, it burbles like it wants to stall, but it wont...I usually have to blip the throttle twice for it to stay in the rev range. I went as far as to pull out my ecu last night to see of there was a chip in there. Nope, nothing. I changed/cleaned everything (even replaced the fuel pump) you did except change my air filter. All of my vaccum lines seem fine, no exhaust leaks, Ive been stumped for 2 years lol. I have never reset the IAC so hopefully that could be it. Someone even suggested that I had a leaky injector and it was flooding the cylinder while I was off the gas, but it doesnt seem feasable to me. My problem also gets worse depending on the humidity. Hope you can find a solution because I sure as hell cant.

yeah I heel-toe downshift. and yeah occasionally when I blip the throttle it gurgles and then finally catches up.

The weird thing is, granted it didn't change the high idle, when my injector went dead and I replaced it, it ran damn good for a short period of time and now it's shitting on itself again. We'll see how she runs when Lee's injectors get here... But yeah I'll try the IAC reset tonight if I have time before class. if not, I have a half day at work tomorrow so I've got plenty of time to mess with the car.

 

[Lee12609]

you arent resetting the IAC, you are resetting the throttle stop. the throttle stop determines the amount of air the throttle lets by, too much is just as bad as too little, so do it exactly as i described.

i've got the injectors boxed up, will take them down to the post office tomorrow afternoon. you are getting my old set, i actually have 3, but i realized the set from my buddies 95 cobra are #24, the other set of #19 i have are from a 94 gt. mine were working perfectly so i'm sending them.

 

[MadStang]

you arent resetting the IAC, you are resetting the throttle stop. the throttle stop determines the amount of air the throttle lets by, too much is just as bad as too little, so do it exactly as i described.

i've got the injectors boxed up, will take them down to the post office tomorrow afternoon. you are getting my old set, i actually have 3, but i realized the set from my buddies 95 cobra are #24, the other set of #19 i have are from a 94 gt. mine were working perfectly so i'm sending them.

oh I see what you mean. alright I'll get after it

Sounds good man, I appreciate it.

 

[JDwhite98gt]

Sorry to hijack but I was listening to my injectors and they all click similarly, but the ones in my manifold are orange. I'm used to seeing yellow injectors of which I also have a full set. are they the same (orange and yellow) as in how much they flow?

 

[MadStang]

iirc they have a different number of nozzles.. but don't quote me on that.

 

[MadStang]

Update: Drove home w/ the a/c on, the idle was smoother than a cat's tuxedo (that's really smooth by the way). Granted until I come to a complete stop the idle hangs at 1000rpms and slowly goes down to 850-900 when I'm completely stopped. When I got home and turned the a/c off, I let the car idle. it idled rougher with the a/c off than the a/c on. Also when I was driving home, when the a/c would cycle you could feel it in an abrupt jerk...

That's my update for now. Eating then going to class. I will reset the throttle stop tomorrow!

 

[Lee12609]

Sorry to hijack but I was listening to my injectors and they all click similarly, but the ones in my manifold are orange. I'm used to seeing yellow injectors of which I also have a full set. are they the same (orange and yellow) as in how much they flow?

what year is your car?

Madstang, what rpm does your car idle at with the a/c off?? i'm guessing the IACV is raising the idle like its supposed to when the a/c is on. if this is the case and the slightly higher 50-100rpm higher idle cures the idle problem you can fix that with the SCT you have coming. dont try to set the idle higher with the throttle stop, thats a waste of time.

you can make an IACV restrictor plate to cure the hanging idle, or if you want to wait a few more days i can make you one and send with the injectors for no charge, but i dont go back to work until friday, let me know. i've had to do this on both of my SN95s.

 

[dirtysnowball302]

Well im sure this isnt what you want to hear but ill tell you anyways. Go to a ford dealership. it will cost you like 90 bucks. ask them if they can run an IDS on your car.Im a ford tech an im telling you with that tool we can test every peice of eletronics in your car..it can bring up codes your car wont show. That will be your best option. You can have a vacumm leak, bad iac,bad tps. Shit you know what, i just fixed my car because it stalled out everytime i started it because my iac plug came unplugged an evenwhen i plugged it back in it still ran like shit. So i unpluged the negetive termnal an let it sit for like five minutes an it runs like a top now. TRy that you might get lucky.

 

[MadStang]

Sorry to hijack but I was listening to my injectors and they all click similarly, but the ones in my manifold are orange. I'm used to seeing yellow injectors of which I also have a full set. are they the same (orange and yellow) as in how much they flow?

what year is your car?

Madstang, what rpm does your car idle at with the a/c off?? i'm guessing the IACV is raising the idle like its supposed to when the a/c is on. if this is the case and the slightly higher 50-100rpm higher idle cures the idle problem you can fix that with the SCT you have coming. dont try to set the idle higher with the throttle stop, thats a waste of time.

you can make an IACV restrictor plate to cure the hanging idle, or if you want to wait a few more days i can make you one and send with the injectors for no charge, but i dont go back to work until friday, let me know. i've had to do this on both of my SN95s.

idles at 850-900 no matter what. It does not raise the idle, when I go from a/c to off it blips the throttle slightly then levels back off after a few seconds between 850-900. The idle is just very erratic especially when I slip the clutch a little bit to move forward a little bit at a light. it'll go up to like 1200 then fall down to 500 then back up and back down, etc. etc. until it levels off at 850-900.

How would the IACV restrictor plate work exactly? and yeah if you can make one and send it out, feel free

 

[MadStang]

Well im sure this isnt what you want to hear but ill tell you anyways. Go to a ford dealership. it will cost you like 90 bucks. ask them if they can run an IDS on your car.Im a ford tech an im telling you with that tool we can test every peice of eletronics in your car..it can bring up codes your car wont show. That will be your best option. You can have a vacumm leak, bad iac,bad tps. SH*T you know what, i just fixed my car because it stalled out everytime i started it because my iac plug came unplugged an evenwhen i plugged it back in it still ran like SH*T. So i unpluged the negetive termnal an let it sit for like five minutes an it runs like a top now. TRy that you might get lucky.

if I can't figure it out, I definitely will. It's just that I DO NOT trust anybody with my car especially with driving it... I have my friends mustang shop where I drive the car in and he knows to only let me move it. No offense but I don't trust anybody at ford, they may have certifications but there ain't no way they're gonna drive a clutch as stiff as mine lol.

And I had my battery disconnected for 20 minutes when I changed out the fuel filter. no difference.

 

[JDwhite98gt]

Sorry to hijack but I was listening to my injectors and they all click similarly, but the ones in my manifold are orange. I'm used to seeing yellow injectors of which I also have a full set. are they the same (orange and yellow) as in how much they flow?

what year is your car?

I have a 98 with an '03 PI engine in it. Not sure what maf I have either, its a cast piece and I have 2 others that are plastic. All Ford pieces

Madstang, what rpm does your car idle at with the a/c off?? i'm guessing the IACV is raising the idle like its supposed to when the a/c is on. if this is the case and the slightly higher 50-100rpm higher idle cures the idle problem you can fix that with the SCT you have coming. dont try to set the idle higher with the throttle stop, thats a waste of time.

you can make an IACV restrictor plate to cure the hanging idle, or if you want to wait a few more days i can make you one and send with the injectors for no charge, but i dont go back to work until friday, let me know. i've had to do this on both of my SN95s.

 

[MadStang]

Lee, I reset the idle for 750. I noticed with the IAC disconnected, the RPM's drop. with IAC it's at 800-850 Without it's 700. Adjusted it to 750, and even with the iac unplugged there's still a miss and slight fluctuation. After I finished the procedure idle hang is mire apparent but it was the same way before. whenever I wipe the ECU clean of the code being thrown from no cats it idles erratically. When the CEL comes back on it smoothens out. So that procedure unfortunately didn't help in any way

 

[Lee12609]

what about the stalling though? i think we are trying to fix multiple problems all at once, its more than likely a couple small problems.

give it atleast a day without clearing the KAM, it might need some time to learn the IAC range.

 

[MadStang]

what about the stalling though? i think we are trying to fix multiple problems all at once, its more than likely a couple small problems.

give it atleast a day without clearing the KAM, it might need some time to learn the IAC range.

I try not to run the car hard unless I really have to. And when I do run the car hard that's when it stalls out. I'll see what I can find by flooring it and coming to a stop. True about the multiple small problems. I'm putting the stock catted h-pipe back on this weekend so we'll see what the deal is since it won't be throwing any codes at all.

What does the acronym KAM stand for? Haven't heard it before...

 

[dirtysnowball302]

ok i might know how you can find out if its a vacum leak or not. Take brake cleaner ( the good stuff) an spray it around the plenum, intake ,the maf, iac...etc..ect evrywhere you could think of a leack could be. If idle goes up..there you go..or at least one of your problems. Also does you car run rich or lean? my brother had a ford f150 truck an when he put exhaust on it there was a pin hole just above the 02 that made this thing run like crap, stalling, iratic idle i welded it an never had a problem. An his never set a code either