this is my dads truck..he bought it new and it has about 23,000miles on it now..and once in awhile it will stall when he presses the brakes..it has only done it 5 times since new..any ideas..i told him about the iac valve..called the dealer and they said that was odd....Thanks Chris...he is thinking about trading it in for a powerstroke....and this truck is like brand new.....

 

When the brakes are applied?

WHEN? When he's drivin' down the road and touches the brakes? It dies?

Or when he's at a stop light....oh wait...he'll be on his brakes for a bit coming to the stop light. So it does BEFORE becomes to a stop?

OR does it die while sitting at a stop? Not when in Neutral or Park but when in gear and the brake is applied.

So when/how exactly does this happen?

 

Like Monsta is asking we need more info?????

Rich

 

Bad power booster?

Creating a huge loss of vacuum?

 

If he's stepping on the brake, then he's NOT stepping on the gas. Could just be a low idle problem. The new V-10's have a tsb on it, though don't know about 2004.

 

well it's when you are comming to a stop.....and backing up with foot on break...have it reverse and put it in drive(with foot on the break) it will die only once in a while.. start it back up and perfect.....never did it when stopped and holding the break..only like i said....

 

Is the OD light on the shifter blinking during this time? And does the OD light work? Press the button while the engine is running - does the light come on?

If it IS a tranny problem, sounds like wiring or a solenoid sticking...

 

Initially sounds to my like IAC going south but could be trany logic not disengaging the lock up torque converter fast enough... this can be due to low or wrong trany fluid or looses trans umbilical connector... I have seen this more then once on relatively new PSD versions...

vacuum leak in brake booster is usually not intermittant... it either has a good seal or it does not... but I have seen some weird things in the past so it is worth considering also

IAC first
Trans fluid type and level
Trans electrical
All electrical grounds
Brake boost system

this is the order I would troubleshoot

 

the weird thing about it is you really don't know it died until you give it gas and it doesn't go.....but thanks alot for all your advise and seggustions...he is going to have the dealer check all that was mentioned......Thanks again Chris....