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Old 05-18-2011, 05:40 PM   #1
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02 SVT Rough Idle & Other Issues

Hey everyone,

So I've been a member now for quite a while, but this will actually be my first post. I've Already done a lot of research and found some posts discussing similar symptoms of my car, but nothing that is exactly the same. Bought my SVT about 4 years ago now with 34k miles on the car. It now has 71k and has had a few problems, but nothing I wasn't able to figure out. This problem, however, has me stumped, so any help would be greatly appreciated.

The Symptoms:
1. Engine is idling rough. It fluctuates between about 700 and 900 rpms.
2. The engine will try to stall or will stall at idle, especially when I come to a stop at for example an intersection. Sometimes the idle with spike and then drop and stall or it will just start to drop and eventually stall. The car always restarts after this, but sometimes takes a bit more cranking to get it started. The battery light will usually come on when this is happening.
3. The dash lights flicker pretty constantly, dimming just slightly.
4. The engine is feeling very sluggish and does not have the power it once did.
5. The stereo will revert back to factory settings on occasion, usually when the car sits in the garage over night. Although I'm no longer sure this is happening will the car is just sitting turned off or when I turn the ignition. I do sometimes get a loud "pop" through the sub. when I start the car as well.
6. There is a slight ticking noise from behind the gauges. (I've seen other posts mention this, but could not find a direct answer)
7. Not sure if this is related or a separate issue, but the fuel gauge used to peg to full immediately after filling the tank, but now takes about 15 mins.

Whats Known:
1. Took the car to Ford and they said the alternator might be going out. Took that out of the car and had it tested. The alternator is fine, but the "Stator" connector (I think it was called) is dead. I found a post about the 3 prong wire connector itself going out, but could not find one about the connector on the alternator going out.
2. The battery terminals are corroding quite a lot.
3. Tested the voltage of the battery, was getting about 12.96v (I think that's right)
4. Just changed the spark plugs about a month ago now.
5. This has been a problem for a while now and is getting progressively worse.

That's a lot. Well, this could all be one big problem or several smaller problems, not really sure. One thing I have not checked on yet are my grounds, I do need to do that. So, if anyone has any thoughts, I would greatly appreciate the input.

I also might see if I can make a video with audio of the car at idle, if anyone thinks that might help to figure some things out. Otherwise, if there is any more info need that I have not provided, let me know and I will do the best I can to provide it.

Thanks.


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Old 05-18-2011, 06:24 PM   #2
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A faulty voltage regulator (non-serviceable part) within the alt can cause fluctuating voltage output which can causes sensitive electronics to do "odd" things. I suspect all your symptoms are related.
Renew the alt connector (new pigtail), clean the grounds, checks for wiring breaks/shorts in the alt harness, clean the battery terminals thoroughly. Have the battery load tested.
Dash light flickering/odd electrical behavior usually points to alt failure of some sort.
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Old 05-18-2011, 11:08 PM   #3
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Check your battery terminals.. Resolve your Alternator problem..

Clean your air intake and MAF sensor. They are likely filthy if its idling like that.
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Old 05-19-2011, 07:36 PM   #4
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Awesome, thanks for the replies. I will definitely check the MAF sensor and clean the air intake.

I actually constantly have to clean the battery terminals, at this point I'm thinking of just replacing them, I've always had concern with Ford just leaving exposed wire anyway.

As for the alternator, is there a way to replace just the connector that's on the alternator or would I have to just get a new alternator altogether?

Have any idea if the ticking noise from behind the gauges would be related to this or is that a whole other problem? It seems like it has been doing it for far longer than when these symptoms started showing up.

Thanks again.
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Old 05-20-2011, 07:47 PM   #5
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^^^i also have that small ticking sound behind my gauges somewhere in the dash too when i slightly tap the throttle dont know what it is
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Old 05-24-2011, 03:34 PM   #6
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Yeah, I have no idea what is causing the ticking noise, but it is always there on my Focus.
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Old 09-20-2011, 07:54 PM   #7
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i had the same problem of the car turning off after going to idle. i just changed my alternator and the problem went away.
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Old 11-25-2015, 08:00 PM   #8
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I know this is an old thread... but symptoms 1-3 and 5 are exactly what I'm experiencing. What resolved the issue?

I'm thinking it could be:
Alternator pigtail
Coil pack pigtail
Throttle position sensor

At times I will try to start the car and with a *click* everything goes blank - dead. And then I'll pull the key out and try again. After 1-4 more tries it'll start up like nothing ever happened.

Thanks
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Old 11-25-2015, 08:30 PM   #9
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Yup, OP hasn't posted in a few years now so learning the resolution isn't likely.

The symptom you typed is most often from bad connection at the battery terminals, and possible for a poor one at the other ends.

Pull the battery terminals for cleaning & make sure they go back on tight (can't twist by hand) and other symptoms might go away or be reduced.
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Old 11-25-2015, 09:01 PM   #10
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Quote:
Originally Posted by sailor View Post
Yup, OP hasn't posted in a few years now so learning the resolution isn't likely.

The symptom you typed is most often from bad connection at the battery terminals, and possible for a poor one at the other ends.

Pull the battery terminals for cleaning & make sure they go back on tight (can't twist by hand) and other symptoms might go away or be reduced.
I'll look into that! The positive side is definitely not tight enough...

If this doesn't resolve any issues, perhaps it's the pigtail?

Thanks!
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