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Old 01-16-2015, 04:33 PM   #36
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If they do it make sure the throttle body is cleaned well made a big difference on throttle response on my truck.
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Old 01-16-2015, 05:07 PM   #37
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My friend we'll be helping me with the seafoam. I'm doing to bottles to kinda over kill it, then change the plugs and oil change
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Old 01-16-2015, 07:22 PM   #38
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Seafoam won't cost 40 bucks. At Advanced Auto is a sale. $7.67 instead of $11.99. Maybe someone torque the plug wrong. Replace the plug and see what happens. I think you said you were going to anyway. How did they determine your car was carboned up? What did they see? Watch those people.
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Old 01-16-2015, 08:42 PM   #39
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My friend we'll be helping me with the seafoam. I'm doing to bottles to kinda over kill it, then change the plugs and oil change
Get the Sea Foam Deep Creep use it for cleaning the throttle body and upper intake, clean this last and let it sit for twenty minutes or so before you start it.

For the following steps use one to three cans of Sea Foam depending on carbon build up.

Use half a can in your crank case and put the other half in the gas tank, preferably with a full tank of gas. Run it in the crank case no longer than 250 miles.

Now pouting this down the brake booster to intake line first the vehicle has to be up to a normal operating temperature. Then turn the vehicle off, pop off line from the brake booster, this may require some force or it may just pop off easily. With line off restart vehicle slowly pour one entire bottle down the line. Wait until your down to the last 1/3 of the bottle then shut off the vehicle and let the Sea Foam. While running the first 2/3 if can through the vehicle it will smoke heavily, possible check engine light coming on, this is where a second person comes in hand keeping the vehicle in the 1500 to 2000 RPM range. If carbon build up seems heavy use whole can the use a second can again.

Sea Foam is an petrol based product and will not harm sensors. That being said do not spray Sea Foam Deep Creep on any sensors around intake like your Mass Air Flow sensor.

If I was changing the plugs and coil packs personally I would do that last. Best of luck and hope your cars performance issues are resolved by these simple steps.
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Old 01-16-2015, 09:31 PM   #40
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Thanks guys I'll be posting results tomorrow and pics of the smoke show. Also they determined by plugging the car to a computer. I guess the guy said they went into mode 6 lol and that it said cylinder 4 was misfiring and when they checked the plug it cracked? And thats how they determined the build up
I got 2 bottles of sea foam
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Old 01-17-2015, 02:49 PM   #41
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So i put half on the gas tank and half on oil. I put another by the brake booster and not as much smoke came out as i thought
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Old 01-17-2015, 03:08 PM   #42
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Fuel efficiency will go up some and not having the big smoke show is a good thing now much carbon build up!
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Old 01-17-2015, 03:48 PM   #43
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So i guess they exaggerated how much carbon was actually in there. Anyways the plugs and oil will be changed once the car cools down and hopefully that solves this big headache
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Old 01-17-2015, 04:24 PM   #44
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Good news them and glad it helped some but check the throttle body area and see how clean it is.
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Old 01-17-2015, 04:51 PM   #45
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I will
Here's a pic of the plugs btw
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Old 01-17-2015, 04:52 PM   #46
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Certainly time for a change
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Old 01-19-2015, 09:04 AM   #47
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I know when using gas additives you will get a white coating. Also a vacuum leak or running two lean will cause white on plugs. I have heard of coolant leaks too affecting the plugs like that. Here's a link from NGK http://www.ngk.com.au/spark-plugs/te...-plug-analysis
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Old 01-19-2015, 09:38 AM   #48
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Thanks for the link I'll check it out. I never use any gas additives since i read that its just snake oil lol. Only seafoam and just barely is the only liquid besides gas that I've put in my tank. Also if it was running to lean I don't think it would have passed inspection. I drove my car for 2 hours yesterday and it ran like a champ 👍
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Old 01-19-2015, 10:17 AM   #49
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mine was my stopped up cats i put some pypes high flow cats and made her dual and changed the plugs my car stopped doing the exact thing urs was and when it jerked if felt like a loss of hp right?
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Old 01-19-2015, 09:20 PM   #50
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Pretty much. The car goes up to 80 with no problem now but before it felt like it was taking for ever
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Old 01-24-2015, 07:48 PM   #51
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Bump
The problem came back with a vengeance
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Old 01-25-2015, 07:31 PM   #52
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Any CEL popping up?
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Old 01-25-2015, 07:34 PM   #53
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Nah no light. It sputters like a ***** and i hate it. I'm sitting at a light and i feel a strong mis fire but i noticed it does it once its hot like after a 20-30 minute drive
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Old 01-25-2015, 09:44 PM   #54
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Mine is doing the same thing once I get to operating temperature it's shot. Take it to a second shop for a look.
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Old 01-25-2015, 10:18 PM   #55
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I am Tuesday
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Old 01-26-2015, 08:39 AM   #56
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I know this may not help but I figured to add it anyway. This part also can come by a different name whether you have a 3.8 or 8 cylinder. Who knows? If the car is up to temp maybe the this sensor could be sending a bad signal. For my 3.8 it's on the drivers side to the back of the motor on the right. 8 cylinder is in front. How I know is I was looking for mine.
Mustang Coolant Temperature Sensor (96-04) 3.8 4.6
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Old 01-26-2015, 09:22 AM   #57
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Thanks SueK!
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Old 01-26-2015, 10:02 AM   #58
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Thanks SueK!
You're welcome. Mine was kicking on the fan a lot and idling weird. It's one of those sensors people are not really known. Usually people as you know start with the EGR,etc. Like it said in the link the ECM can get screwed up because of it.
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Old 01-26-2015, 12:34 PM   #59
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I have replaced the cam sensors on my 5.4 already but didn't think or know of coolant temp sensor.
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Old 01-26-2015, 06:46 PM   #60
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I have replaced the cam sensors on my 5.4 already but didn't think or know of coolant temp sensor.
My car wasn't running right and I remember the fan kept kicking in. I must have searched all night and then I found it. Like I said what I noticed there are two different names for the same part. For me it was a freakin pain in the butt to get to it. I said why couldn't it be in an easy place like the GT. HAHAHA Even so, I had to do a search and buy a factory manual for help. The factory manual didn't help. It never said EXACTLY where it was. Every time I asked a so called pro they said near my thermostat. Nope. It was a royal pain in the butt. There's a harness next to the firewall that was tight quarters to get out of the way,etc. Oh well, The adventures of simple looking parts and a pain to install.
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Old 01-26-2015, 07:22 PM   #61
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Pain to install seems to go hand and hand with the modular engines.
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