2000 QX4 Infiniti accelerating out of control???

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Okay, so this vehicle I have serviced a few times for a co-worker. They just called me half an our ago saying they were driving and the car just started going faster. The person had to use full on brakes + parking brake(not clear if they shifted into Neutral or not, apparently it 'sounds' like that didn't help). What could this be? Stuck pedal or broken throttle linkage? I haven't seen the car yet but want to get an idea of if it's something I can tackle or not before attempting. I already advised not to drive the vehicle, obviously. I recently changed the oil and did a transmission fluid drain 're-fill'. The person also mentioned the pedal came back up but felt 'different'. They also heard a loud pop. Any ideas? Thank you!
 

ltslimjim

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Originally Posted By: d00df00d
Throttle butterfly spring partly dislodged?
Ah, good idea. I had them pull on the throttle cables to see if they were tight or not. This could be it, but I was even trying to get them just to use a friend to press the pedal while looking at the throttle plate/the cables, but it was like speaking Latin to them. I couldn't get them to understand how exactly to gain access to the area, etc.
 
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Perhaps the throttle plate stuck open? I've never had this happen nor heard of this happening on R50s. Was cruise control being used when this problem occurred?
 
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I would lubricate the throttle cable and ensure nothing is obstructing the throttle body or cables (including cruise cable). Maybe clean the throttle body while you're at it. EDIT: And ensure that the two screws holding in the throttle plate are not missing.
 

ltslimjim

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Originally Posted By: d00df00d
Throttle butterfly spring partly dislodged?
Yep, this was the culprit. Too bad it needs a brake job now, but at least the car is okay and no one got hurt.
 
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