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Old 05-09-2008, 02:04 PM   #1
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Got my SVTF and already need some help



I picked up my '04 SVTF and had a taste of what it is supposed to be like and love it.

It is bone stock.. even has a motorcraft battery and original MAF sensor clamps.

Before I bought it from a small-time dealer he went ot get it inspected. It failed with a "lean code" he never told me which code exactly.

So obviously he couldn't sell it and so he frantically "fixed" it. He put in a new fuel filter, cleaned the throttle body and put in some injector cleaner. Well the coded didn't come back for 130 miles and he got it inspected.

It came back yesterday. When I first test drove it it felt slow.. then when I bought it it felt great, fast, 2nd gear chirps and all. Very pleased with it.
Now it stumbles and just generally feel sluggish. It's like there's something flopping around somewhere sometimes limiting airflow or something.

Upon take off it will feel sluggish, and stumble some and Sometimes it even stumbles out of it and starts to accelerate like it should.

When cruising along at a constant speed and trying to accelelrate it just feels bogged down with an occasional stumble. If I get on it a little more sometimes it seems to "clear up" and then it goes.

I have several questions..

#1 Is there a way to check codes without a scanner? in some GM cars you can jumper two pins and it will flash the engine light and read out codes.

#2 What are common problems with Foci (Focuses?) or SVTFs that cause this?

#3 what should i check first?

Other than the stumbling and weak power, it runs fine. It idles fine, no hunting around or missing. It is smooth and no backfires or popping out of the exhaust. no smoke. etc.


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Old 05-09-2008, 02:13 PM   #2
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just take it to murrays or autozone and rent the scanner and they will tell you the codes. Or jump on texasfoci.com and see if someone in dallas has something that can read it.

Also the sluggish on low rpms is usually the dsi clip. check that out
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Old 05-09-2008, 02:18 PM   #3
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Yeha I wanted to check the DSI clip since I have read that they commonly fail, but I was also under the impression that they don't have any effect until it is over 5k RPMS. Is that wrong?

Anyway.. how do I get the bottom of the airbox out of the car? I can't see any screws and I hate to pull hard if I am missing something. I thought it maybe be secured with rubber bushings and prongs that push in since the box is not firmly attached, but I don't want ot break anything.
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Old 05-09-2008, 02:26 PM   #4
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i have a diablosport tuner for sale that would help you out. has a custom tune ready to install in your car if you are interested pm me. the custom tune is well known here in the forums and is one of the best for a stock svt focus.
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Old 05-09-2008, 02:34 PM   #5
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no idea on how to do that. If the dsi is broke it will be sluggish in low rpms because when you start the car it switches them over. when you hit 5000 rpms it then switches over to what gives you more power up top.
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Old 05-09-2008, 02:45 PM   #6
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its held in by the manifold couplers and one rubber bushing. remove the couplers and pull straight up on it, then youll have to work it out from behind the engine
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Old 05-09-2008, 03:51 PM   #7
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Honestly you're probably experiencing the common "stumble" that happens on startup with the SVTF, unless you tell me

does it happen even after you've been driving for 10 minutes?
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Old 05-09-2008, 03:52 PM   #8
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its held in by the manifold couplers and one rubber bushing. remove the couplers and pull straight up on it, then youll have to work it out from behind the engine
I was refering to the bottom half of the stock aircleaner box, not the intake manifold. Or do I have to take off the manifold to get to the DSI clip?
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Old 05-09-2008, 03:54 PM   #9
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Honestly you're probably experiencing the common "stumble" that happens on startup with the SVTF, unless you tell me

does it happen even after you've been driving for 10 minutes?
Well I'm not sure cause I rarely drive it longer than 10 min. It still pops up a code though..

Can I erase the codes by pulling the fuse for the computer or do I have to pull the battery cable?
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Old 05-09-2008, 04:50 PM   #10
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OK got the codes.. P1132 and P1131.. so lean and rich

I found the definitions on the forum, but need some clarity

"P1131 - Lack of HO2S-11 Switch, Sensor Indicates Lean A HEGO sensor indicating lean at the end of a test is trying to correct for an over-rich condition. The test fails when the fuel control system no longer detects switching for a calibrated amount of time. See Possible Causes for DTC P1130"

HO2S - I assume stands for heated oxygen sensor.. right?
HEGO - what is that?

can I get these codes with a bad oxygen sensor, without getting a specific oxygen sensor code?
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