[Cobrajet67]

The SJB malfunctioning is a common problem in the 2005-14 Mustangs due mostly to water intrusion thru the firewall which then pours onto the SJB. The 2005-09 had a TSB for a couple of known water intrusion points since the water issue was more prevalent on these early years. tsb08-26-07.pdf (mygtcs.com)
The larger issue is the cowl drains on the firewall getting clogged with debris/sludge and then filling up with water. This will eventually overflow thru the HVAC system and onto the SJB. This was terrible design placement of the SJB that Ford engineers apparently didn't have the sense to shield from any potential water damage. Idk for sure but I think there may have been a plastic water shield put on cars that either had this problem under warranty or there may have been a TSB on it. Either that or it may just have been me remembering a pic of one or two put on by a car owner.
You could just send your SJB out to be checked by an automotive module service that will both check and fix it if needed. Automotive Circuit Solutions, Autoecm, Upfix, and Module Master are places worth checking into.

 

[Cobrajet67]

I have looked over the ciruitry as i have some experience with IC repair but this is a little beyond something i can handle. I couldn't find any bad traces on the board anywhere but the large chip on the top left looks like it may have overheated enough to make the epoxy coating bubble up.

I'm going to contact some of the repair companies listed above when I get home in a few hours.

I will keep y'all posted. Thanks for all of the fast replies 🙏

All the module repair services that I listed have either been used before and named on this forum or have a AAA rating from the BBB with reviews on their websites.

 

[Cobrajet67]

With most modules I would usually agree but the problem with a used SJB is that many out there are also water damaged/malfunctioning. I would be much more willing to take the chance with a PCM or pretty much any other module other than the SJB. The failure rate with SJBs is too high to take that risk imo. There's also the issue of having to match the SJB #s up with your original or knowing the compatible engineering #s that you can use.

 

[Cobrajet67]

When i got home i scanned for trouble codes again and this time the SJB only had 12 this time.

Only 12?
I would have it sent out to a reputable module service and have them test and fix it.

 

[Cobrajet67]

My throttle body is reacting whenever the key is on and I step on the pedal. It is acting as if the engine is running and i have full control of throttle input. It's possible that i have never heard this before but I'm just not sure. After driving this car for almost 18 years I feel like I would have heard this before.

If it does it with the key on then that's normal but if it were to do that when the key is off then a single time when you step on the pedal then that might be ok but if it does it again multiple times in succession every time you step on the pedal then that's definitely not normal.

 

[Cobrajet67]

Actually it is normal for the pedal to signal the TB with key on/engine off. Holding the pedal down after a timing job or even an oil change is an easy way to prime the oil system as it puts the PCM in to safety mode and will not allow the engine to start. This is also how you find "dead spots" in the throttle position sensor and/or pedal sensor. Some people diagnosing TPS issues by themselves will usually put a full length mirror or such in front of the vehicle so they can watch the throttle blade sweep as they gradually press the throttle pedal. The clicking sound under the hood is the throttle blade going to the full open position if you mash it to the floor instantly.

Thank you for the correction. I read over the bit saying that the key was on when it was doing this. I responded thinking that it was doing this when the key was off which of course would be abnormal.