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Old 02-24-2011, 06:18 PM   #1
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Anyone else have this problem?

With our 2002 GT 4.6 when sitting at a light it idles rough. The rpm's keep going up and down. And also hear a (I don't know how to describe this) intermittent rumble or moan kinda noise. We thought it needed a new air filter because the noise seems to be coming from that area but that didn't work. Any ideas?
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Old 02-24-2011, 06:21 PM   #2
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Clean the throttle body really good. Or maybe it's the idle air control. Does it run bad while you are putting it under load.
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Old 02-24-2011, 06:23 PM   #3
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You might also have a bad coil . Did the check engine light ever come on??
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Old 02-24-2011, 06:24 PM   #4
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No once your moving it runs fine.
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Old 02-24-2011, 06:25 PM   #5
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No the check engine light hasn't come on yet.
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Old 02-24-2011, 06:26 PM   #6
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I had that exact problem with my 2000 gt. I gave her a seafoam treatment and problem solved
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Old 02-24-2011, 06:27 PM   #7
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How long has it been since you cleaned the throttle body? How many miles on car?
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Old 02-24-2011, 06:28 PM   #8
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Sorry I'm a girl that doesn't know much about cars. Whats a seafoam treatment?
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Old 02-24-2011, 06:29 PM   #9
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It has alittle over 90,000. We've only had the car less then a year so I'm not sure when it was cleaned last.
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Old 02-24-2011, 06:31 PM   #10
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Seafoam is a additive you add to your fuel tank it cleans your fuel system and injectors
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Old 02-24-2011, 06:32 PM   #11
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I googled the seafoam treatment so now I know what that is! we'll have to give that a try, thanks!
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Old 02-24-2011, 06:34 PM   #12
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Quote:
Originally Posted by LuvMyMustangGT
With our 2002 GT 4.6 when sitting at a light it idles rough. The rpm's keep going up and down. And also hear a (I don't know how to describe this) intermittent rumble or moan kinda noise. We thought it needed a new air filter because the noise seems to be coming from that area but that didn't work. Any ideas?
I had same problem on my 2000 gt and it was the TPS. "throttle position sensor". They go bad quite often.
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Old 02-24-2011, 06:40 PM   #13
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You need to find some one to help you take the air intake off and get to the throttle body. It is the part that sits on top of your motor and has a pony on it. Have some one push down gas pedal with key on but do not start car!!! Inside a flipper will open up . Get a car of carb cleaner and spray it on a rag completely . Spray some in the throttle body also and clean it really good . Black stuff will probably come out and thats ok . After that put everything back together like it was. Start the car . It might die the first start . But start it again and give it alittle gas. See if that fixes the problem
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Old 02-24-2011, 06:41 PM   #14
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Quote:
Originally Posted by Gster

I had same problem on my 2000 gt and it was the TPS. "throttle position sensor". They go bad quite often.
The tps will usually throw a CEL though. I did on my '93 when it went bad.
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Old 02-24-2011, 06:42 PM   #15
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Seafoam is a additive you add to your fuel tank it cleans your fuel system and injectors
Not quite. Much more than fuel. Add to crankcase and a vacuum line
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Old 02-24-2011, 06:43 PM   #16
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Originally Posted by LuvMyMustangGT
I googled the seafoam treatment so now I know what that is! we'll have to give that a try, thanks!
I do seafoam every 3rd oil change. Keeps er clean
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Old 02-24-2011, 06:51 PM   #17
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Thanks. I'll ask my nephew to help me to clean the throttle body. And I'll also try the seafoam treatment. We put a new sensor on it but I can't remember which one. I'll ask my husband later. My nephew also thought it could be a vacuum leak. Is that a possibility too?
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Old 02-24-2011, 06:54 PM   #18
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Originally Posted by LuvMyMustangGT
Thanks. I'll ask my nephew to help me to clean the throttle body. And I'll also try the seafoam treatment. We put a new sensor on it but I can't remember which one. I'll ask my husband later. My nephew also thought it could be a vacuum leak. Is that a possibility too?
Yes that is a possibility. If the tps was changed, it may not be under the voltage its supposed to be. You will need a digital voltmeter to check it.
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Old 02-24-2011, 06:59 PM   #19
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It goes in for inspection tomorrow I'll ask them to check the voltage for me. Thanks everyone. I'm so glad that I joined this forum. It's like having a big Mustang family!
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Old 02-24-2011, 07:01 PM   #20
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It goes in for inspection tomorrow I'll ask them to check the voltage for me. Thanks everyone. I'm so glad that I joined this forum. It's like having a big Mustang family!
That it is! Best Mustang site online.
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Old 02-24-2011, 07:03 PM   #21
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Originally Posted by 93CobraGuy

That it is! Best Mustang site online.
+1
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Old 02-24-2011, 07:14 PM   #22
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Originally Posted by LuvMyMustangGT
Thanks. I'll ask my nephew to help me to clean the throttle body. And I'll also try the seafoam treatment. We put a new sensor on it but I can't remember which one. I'll ask my husband later. My nephew also thought it could be a vacuum leak. Is that a possibility too?
Yup... Could be. Seafoam is 7 bucks a can and a good idea to do anyway. Like I said I do it every third oil change. And just follow the directions on the can. Don't listen to anyone tell ya what they do. Just follow the directions. And YouTube has a video on how it's done. Which vacuum line to go into and so on. Check that out. My buddy Sharkbait has one on there too
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Old 02-24-2011, 07:17 PM   #23
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Thanks I'll check that out on YouTube. That's where I learned to change the headlights, lol.
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Old 02-24-2011, 07:17 PM   #24
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I just undo the one from the brake booster and slowly pour it in. That's how I did Shelbie's on her 02 GT.
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Old 02-24-2011, 07:28 PM   #25
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Could be the idle air control (IAC). I had that problem. My engine at idle would race and then almost stall. It would do it continuously. Changed the IAC and it was fixed. Also very easy.
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Old 02-24-2011, 07:29 PM   #26
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Originally Posted by 93CobraGuy
I just undo the one from the brake booster and slowly pour it in. That's how I did Shelbie's on her 02 GT.
I went into the plenum. Same deal tho. Poured it in slow then let sit for a half hour. I did it again a week later and there was waaaaaaaay less smoke than the first time. Now it barely smokes when I do it so I figure it must be doing something. Smoothed out my idle and mileage improved slightly. Love that stuff
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Old 02-24-2011, 07:29 PM   #27
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Could be the idle air control (IAC). I had that problem. My engine at idle would race and then almost stall. It would do it continuously. Changed the IAC and it was fixed. Also very easy.
Electronics spray cleaner works too unless it's a dead sensor
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Old 02-24-2011, 07:43 PM   #28
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How much seafoam treatment do you use? A whole bottle in the tank? And how much in the vacuum line?
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Old 02-24-2011, 08:14 PM   #29
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How much seafoam treatment do you use? A whole bottle in the tank? And how much in the vacuum line?
1/3 in tank 1/3 in vacuum line and 1/3 in crankcase about 1000 miles before oil change. You can leave it in for the life if the oil but I prefer to just have oil in there. The instructions on can are pretty straight forward. And if you check out the web site there is info there too
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Old 02-24-2011, 08:16 PM   #30
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Re: Anyone else have this problem?

Do these cars have MAF's? That was causing idle problems with my car.
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Old 02-24-2011, 08:24 PM   #31
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Yeah I think they do. I had a Ford Explorer that my MAF went out on but it stopped running after you take your foot off the gas. The Mustang isn't doing that yet.
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Old 02-24-2011, 08:29 PM   #32
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Re: Anyone else have this problem?

Well mine had a rough Idle and I just sprayed the MAF with some MAF cleaner and let it dry out and it hasn't really had these problems since. We also replaced the coolant temp sensor so I'm not sure which one fixed it exactly but thats what we did.
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Old 02-24-2011, 08:33 PM   #33
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Originally Posted by Everett

1/3 in tank 1/3 in vacuum line and 1/3 in crankcase about 1000 miles before oil change. You can leave it in for the life if the oil but I prefer to just have oil in there. The instructions on can are pretty straight forward. And if you check out the web site there is info there too
You can do it that way but I like to do half in the tank, and half in the vaccum line. I prefer not to add anything but oil in my crankcase.
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Old 02-24-2011, 09:20 PM   #34
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True that
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Old 02-24-2011, 10:31 PM   #35
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Originally Posted by 93CobraGuy

You can do it that way but I like to do half in the tank, and half in the vaccum line. I prefer not to add anything but oil in my crankcase.
K 93. How do you dissolve engine sludge. And seafoam is a petroleum product. I also wouldn't run it for a whole oil change interval however when I did my chev I wanted to to a cleaning phase like I had read about at the bob is the oil guy forum so I put cheap 10w30 in and half a can of seafoam. 300 miles later my oil was black as hell so I changed it again. This time went jet black at 1000 miles so I did it again. I did this 4 times never going longer than 1800 miles. My oil now when I change it at 10k it's blackish but not even close to when I did the clean phase and I get better mileage and I don't hear any valvetrain noise at all. It works when used as directed and now that it is clean when I do the treatment every 3rd change it's basically maintenance. I just bought a gallon jug today actually.
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