2008 Loud bang on downshift approx 70 mph when passing

[Edmaude]

Update:

Is there a way to diagnose a bad coil or spark plug w/o a check engine light? I am pretty aggravated with the trans on this truck due to these issues as well as periodic dumping of transmission fluid when parked for more than 2 days in my driveway. Not to forget the transmission was also out of the truck for overdrive clutch TSB at 17k as well.

I have the certified powertrain coverage plus 100k premium ford extended warranty as well, but really consider taking a loss and getting rid of the truck soon

Let's please keep this post going until one of us gets this fixed

Thanks
Ed

 

[01yellerCobra]

You can ohm out the coils. I don't know what the reading is supposed to be, but I'm sure it's online somewhere. The only way to check the plugs is to pull them and inspect them.

 

[JoeR123]

Update:

Is there a way to diagnose a bad coil or spark plug w/o a check engine light? I am pretty aggravated with the trans on this truck due to these issues as well as periodic dumping of transmission fluid when parked for more than 2 days in my driveway. Not to forget the transmission was also out of the truck for overdrive clutch TSB at 17k as well.

I have the certified powertrain coverage plus 100k premium ford extended warranty as well, but really consider taking a loss and getting rid of the truck soon

Let's please keep this post going until one of us gets this fixed

Thanks
Ed

I saw you were still active. I have a 2009 that has the same issue. 150k on it now. Took it back to the dealer when knew they said they couldn’t find anything. It hasn’t broken down but I still want to fix it

 

[williameverett12]

Folks,

We have 58k on the truck and it has previously had the trans out for overdrive clutch replacement at 16k. The dealer also put 2 new u-joints in last week. We are getting an intermittent very loud bang when downshifting to pass on the highway at approx 70 mph. It is very abrupt and I have never experienced this in any truck or car I have ever owned.

The dealer can not find an issue, which sucks....Does anyone have any insight?

Thanks
Ed

Had the same issue with my 2017. Speed senor failure. I know when it happens it sound like a bomb going off. It's the senor in the tranmission.