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Old 07-29-2013, 07:43 PM   #121
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Quote:
Originally Posted by shananigans89 View Post
12 pages of text, TLDR. what i want to know is, has anyone solved this with a new fuel pump? i'm having this problem (same as OP) and before toms tune i was getting CEL's telling me i need to replace the fuel pump. after toms tune, not nearly as many CEL's but i still get them once in a while to change the fuel pump. i think that is the next thing i am going to do to try and solve this. it feels like a lack of fuel delivery.

just wondering

**also, does anyone know if the high flow fuel pump offered for a 2004 SVT on CFM is worth getting as opposed to stock? should i get that one over stock? or is stock fuel pump good enough? i think i'm going to buy stock because its cheaper.
Holy thread resurrection!

Most of the time this is cured by cleaning the IACV. Some have better luck with a tune, though both help.

Regarding the fuel pump (and perhaps someone can slap me around if I'm wrong ), but the stock pump flows extremely well. If you're having fuel issues, check your fuel filter. I can only see going to a high flow pump if you're running a total RACECAR setup.

FWIW my car has only died on me a few times, usually when its cold out (Texas cold, only around 30 degrees or so). I've had a few idle stumbling issues, but otherwise its fine.

Also worth looking at : plugs, wires, coil pack.
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Old 07-29-2013, 07:57 PM   #122
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LoL thread resurrection. yea i know, i've finally gotten fed up with the problem and just started trying to fix it lately. spark plugs, wires, coil pack, fuel filter all less than 8k miles old. TB is brand new so its still clean. not sure where the IACV is. i've done nearly everything i can think of or find that others have done, except fuel pump. i do keep getting P0172 codes now and then and my code checker says to replace the fuel pump.

my car nearly dies several times a day, when braking hard and clutch in. sometimes idles funny, bogs a bit on acceleration.

fuel pump replace is my next course of action. just wanted to know if the high flow was a good idea. i think i will go with stock.
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Old 07-29-2013, 08:09 PM   #123
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Quote:
Originally Posted by shananigans89 View Post
LoL thread resurrection. yea i know, i've finally gotten fed up with the problem and just started trying to fix it lately. spark plugs, wires, coil pack, fuel filter all less than 8k miles old. TB is brand new so its still clean. not sure where the IACV is. i've done nearly everything i can think of or find that others have done, except fuel pump. i do keep getting P0172 codes now and then and my code checker says to replace the fuel pump.

my car nearly dies several times a day, when braking hard and clutch in. sometimes idles funny, bogs a bit on acceleration.

fuel pump replace is my next course of action. just wanted to know if the high flow was a good idea. i think i will go with stock.
The idle air control valve is the small metal sensor/valve that is bolted onto the intake plumbing right before the manifold, sitting below the throttle body. It's not horribly hard to get to, but it's definitely in tight quarters.

I had to replace my fuel pump in December and I had some of the same symptoms right before it died. I killed my pump by failing to change my filter though, hooray for my ignorance. Not the most fun job in the world.

As for the high flow, I personally don't think it's needed. If you google SVT Focus fuel pump, you'll see a lot of Mustang guys sourcing our stock fuel pumps for their 400hp + builds. I thought it was pretty funny.
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Old 07-29-2013, 10:47 PM   #124
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I think it's the IAC too, Ford has a reputation for bad IACs, and the SVT has the same crappy IAC design from the 80's.

My car rarely stalls, but when it does it surges before it dies. It was easy to notice in my '91 Mustang and 94 Escort because the NVH levels were much higher, my "newer" SVT is smooth enough that I dont notice the surging unless I'm looking at the tach.
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Old 07-30-2013, 03:50 PM   #125
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Quote:
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As for the high flow, I personally don't think it's needed. If you google SVT Focus fuel pump, you'll see a lot of Mustang guys sourcing our stock fuel pumps for their 400hp + builds. I thought it was pretty funny.
hahaha!! that is surprising! well, i will be getting the fuel pump replaced in the morning. if anyone is interested i will let you know if it fixes the problem.
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Old 07-30-2013, 04:20 PM   #126
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I'll input my two cents. My SVT does this. It used to be bad, about a stall a day. With and without Tom's tune. I had him tweak the tune a bit, and it got much better, to the point of being a rare occurance, but still there. A few months later, in January this year, I had my fuel pump and filter replaced (I can't confirm if they were bad per se, but they probably needed replacement). The problem seemed to get even better. Since then I've had maybe three stalls total, but you can tell that sometimes the car wants to do it, but catches the low revs and adds some throttle to compensate. I'd like to try cleaning the IACV, can't hurt anyway.

TL;DR - The SVT just likes to do this. Fuel pump may or may not help, but can't hurt to replace it.
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Old 07-30-2013, 05:25 PM   #127
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so what does anyone think would the be most likely fix at this point? replace IACV or fuel pump?

also, in addition to what i already mentioned i replaced, i was reminded that i'd replaced both O2 sensors and catalytic converter in the last 5k miles.
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Old 08-02-2013, 02:02 PM   #128
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well, i had the fuel pump replaced, and the car seems to run much smoother. however, i had a realization after learning more about the Idle Air Control Valve. when i installed my CFM 67mm throttle body, i was looking at it before i installed it. i didnt know what i was messing with until i realized, i was messing with the idle adjustment screw. after i put it on, i adjusted the screw a bit and noticed the computer seemed to reset the idle after my changes. so i just backed off the screw, and then put it back to where it was just barely touching the throttle bracket. and since then, i've had the same problems as before mentioned.

i've since had a thought and it seems to prove correct. the way i had the screw, was causing more demand on the IACV than it could provide, meaning the RPMS would drop until the car shut off. the IACV couldnt open enought to keep the RPMs up. so i figured if i adjusted the idle screw to open the throttle a bit more, that would allow more air through the main throttle and cause less demand on the idle air control valve in the long run.

after making the adjustments, it seems to have worked. i am even able to notice the tweaks tom has made to my tune. the idle buffer (i think is what i've read that its called) keeps the rpms at ~1800 until i come to a full stop. and now when i clutch in, the rpms drop very slowly. the car only has very slight trouble staying alive now when the A/C is on. i got these results before getting the fuel pump replaced. after the replacement, it seems in need of more tweaking, so thats what i'm about to go do.

just my findings.
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Old 08-06-2013, 12:04 AM   #129
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I would say the Idle air control valve for sure I had the same problem with my 02 svt and just put the new one on it today fixed it 100%
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Old 08-18-2013, 09:36 PM   #130
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" it seems in need of more tweaking, so thats what i'm about to go do. "
Before you do more tweaking, it would be good to know where you are already.
Do you have a tune and tuner? If so, you need to read the idle adaptive readings before you start tweaking things.
The throttle has a spec to flow air. That spec is build into the calibration, so that the idle adaptive is about in the middle, not adding or taking out air.
When you change that, the adaptive needs to re-learn, but there are limits to the learning. There are also calculations based on that air for decelerations and purge flow. When you change that, depending on your operating conditions, the calculations can cause stalls.
You really need to set the idle so the adaptive is close to 0.
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