91 e150
when weather is hot, above 90 degrees, the Van accelerates on its own. The gas pedal sticks and I gave to tap hard and quick to get the rpm’s down. It only happens when weather hot.
Since the problem is intermittent mechanics have “fixed” it numerous times. So far over the corse of quite of few shops this is what has been done
1. Complete tuneup.
2. New fuel filter and air filter
3. Fuel sensor
4. fuel line pressure checked
5. throttle body cleaned twice.
6. egr and vacuum hoses replaced
7. fuel selector valve removed because one tank was previously removed.
8. Throttle position sensor replaced
9. Idle Air Control Valve replaced.
10. 02 sensor replaced
11. accelerator cable replaced.
12. accelator return spring replaced twice
13. all parts sprayed with white grease
This is 6 shops, 1 friend and 2 mobile mechanics and over 2.5 years and over $2,000.00 in “fixes” that don’t fix. There may be a couple parts I am forgetting, I think an emission valve or sensor..but after all this it is hard to recall everything, lol!
Any suggestions would be appreciated.
Just to clarify..I can drive 10 miles on a cool weather day no problems, the engine can be warmed up etc., no problems. The weather goes above 90 and it starts happening.

 

Sounds like a mechanical problem and since you already replaced the throttle cable I'd suspect the throttlebody itself. Home many miles on this rig? Worn bushings in the throttlebody can allow the throttle blades to misalign and get stuck, remove the intake tubing, disconnect the cable and have a real close look at the TB, any play at all in the shaft suggests this is the problem. Of course it could also be carpet or a floor mat jamming the accelerator pedal, don't overlook the simple things.

 

Could the cruise actuator be sticking or have a mind if it’s own? Maybe disconnect it for now.

Sixto
07 E350 5.4 178K miles

 

I removed the cabin carpet for stinky reasons and I drive barefoot so no chance of anything in the way on the operator end,lol. It has 165k. The throttle body has been looked at 3 times, could they really have missed that?

 

When I had a sticky throttle it was the the throttle body shaft that was causing it. I had to remove the TB and soak down the shaft with penetrating fluid..