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Old 03-26-2006, 08:29 AM   #41
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Quote:
Originally posted by sveet03
i am pretty sure i have jus fallen a victim to this problem as well. suddenly, while getting thru the "happy range", there was no "happy noise" anymore, not as much steady power, now the RPMs hang when coasting to a stop in neutral down the driveway, spitting/sputtering while idling...it will be ripped apart as soon as its not cold and dark..hopefully this lil quick fix will get me by until the part comes in..or should i say, hopefully this isnt another costly problem
I too am wondering if mine is working. I've only owned my SVT for 10 days and I have been trying to determine when the change occurs above 5K RPM and don't hear any difference. What kind of sound should I be hearing?

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Old 03-26-2006, 08:56 PM   #42
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^^ if your car is still stock, it probably wont switch over till above 6k. The tunes you can buy from Randy, Wayne, Tom bring that down to about 5k.

The change in tone is subtle, but its there. You will hear it better if you have an aftermarket intake, most likely. If the clip is broke, you can diagnose that by eye...just find it on the side of your intake monifold and see if the cable is attached.
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Old 03-26-2006, 09:31 PM   #43
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Quote:
Originally posted by ..:: sleestak ::..
^^ if your car is still stock, it probably wont switch over till above 6k. The tunes you can buy from Randy, Wayne, Tom bring that down to about 5k.

The change in tone is subtle, but its there. You will hear it better if you have an aftermarket intake, most likely. If the clip is broke, you can diagnose that by eye...just find it on the side of your intake monifold and see if the cable is attached.
Thanks for the info. So if my cable is still attached, then I can assume that the clip isn't broken. I believe the car to be totally stock. I just bought the car 10 days ago with 19000 miles on it and it seems to run fine, but I really don't have any history with it to know if something is wrong. I really like my SVTf, but I seem to be learning of a lot of different failures on this site which is making me a little nervous. However, it really is a great little car.

On a side note, I am wondering if I should purchase the extended warrantee. My dealer said that I have the 75,000 mile engine and drive train warrantee, but that I would have to purchase the bumper to bumper warrantee to cover the miles from 36,000 to 75,000 miles if I also wanted that. The cost is $550 and I have just 5 more days to decide of I want it. It sounds as though most of the problems that I have read about would be covered by the engine/drive train warrantee anyway.

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Old 03-27-2006, 12:58 PM   #44
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^^^ 2004 models do switch at 5,000 on the factory (ZED0) tune.

And, from a previous post:
http://www.focusfanatics.com/forum/s...62&#post563962
Quote:
Originally posted by WD40
If it's working correctly, you shouldn't really feel it.
You might hear a slight change in the intake note, if you've removed the silencer or installed an aftermarket intake,
but it won't kick you back in the seat if that's what you're asking.

Lemme find a better explanation instead of writing it all down again.
Back in a flash....
EDIT:
This is what I was talking about...>>>Clicky

Actually, there's a lot of good information in that thread if you read it in it's entirety.
There's also a link to a "how to" for checking the DSI switch, and for finding out when it switches over.
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Old 03-27-2006, 06:52 PM   #45
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Thanks for that info WD40!!

You were certainly right about there being a lot of good info in the thread that you linked to.

I used to know a lot about engines, but these newer computer controlled engines are a lot different. I am having to learn a lot of new acronyms. It is amazing how much power is being gotton out of little 4 cylinders.

Anyway, I think I will remove the silencer in my air box just to hear the moan.

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Old 03-28-2006, 02:00 PM   #46
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No problem.

And, as far as computer controls on cars, I hear ya!
I can rebuild/tune/adjust any Holley carb...blind folded...while sleeping,
but when it comes to all this new-fangled electronics, I do feel quite overwhelmed at times.
Thank God for sites like FocusFanatics!
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Old 03-28-2006, 05:24 PM   #47
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[QUOTE]Originally posted by WD40
[B]^^^ 2004 models do switch at 5,000 on the factory (ZED0) tune.

I stand corrected.
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Old 03-28-2006, 08:53 PM   #48
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5000 RPM or 6000 RPM

Quote:
Originally posted by WD40
^^^ 2004 models do switch at 5,000 on the factory (ZED0) tune.

And, from a previous post:
http://www.focusfanatics.com/forum/s...62&#post563962
.

I have a 2004 SVTf and the intake runners switch at either 5000 or 6000 RPMs. Mine was manufactured in March of 2004 if that makes any difference.

I have a question

It switches at 5000 if I have a ZEDO factory chip? I can determine this by dropping my glove box and looking for ZEDO on the ECU? I have already checked the door jams and I can't find any info there.

What does ZEDO stand for , if anything?

And finally, does the cam timing change at about the same time as the intake runners change?

I'm still trying to fiqure out how the cam timing is changed. I can't seem to find any info on that , but I can try that question at another time. I do know that some Honda engines have another cam which kicks in at higher RPMs and I am thinking that it may be something like that.

I'm slowly learning what makes this great little car tick.
Thanks,
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Old 03-29-2006, 11:58 AM   #49
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ZED0 (zero) is just the computer code, nothing more than that, except they do go in series.
RLA6 for early models, YRF0 update for 02-03 models.

All ZED0 cars will switch the runners at 5,000rpm.
If you have access to an external tach, it's very easy to check.
That linked thread in an earlier post should explain it quite well.

The VCT and DSI are completely independent systems.
Frankly, the VCT has more to do with emissions (it's the reason we don't have an EGR valve) than performance,
though it has been shown that disconnecting it on a NA car will lose power.
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Old 03-29-2006, 04:36 PM   #50
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Quote:
Originally posted by WD40
ZED0 (zero) is just the computer code, nothing more than that, except they do go in series.
RLA6 for early models, YRF0 update for 02-03 models.

All ZED0 cars will switch the runners at 5,000rpm.
If you have access to an external tach, it's very easy to check.
That linked thread in an earlier post should explain it quite well.

The VCT and DSI are completely independent systems.
Frankly, the VCT has more to do with emissions (it's the reason we don't have an EGR valve) than performance,
though it has been shown that disconnecting it on a NA car will lose power.
Thanks once again WD. I had figure that the cam timing had more to do with the strong top end. It's good to know that it is the intake. It sure does make a difference.

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