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Bronco II stalls with light throttle


ullysses

New Member
Joined
May 11, 2012
Messages
1
Transmission
Automatic
Hey there! The car is a 1986 Bronco II.

Here’s the problem. The car starts just fine (even if it’s been standing still for a while), idles normally at about 800-900 rpm, but dies at around 1000-1500 rpm when on light throttle. If I floor it, it works beautifully and revs quickly. I had my fuel pressure checked and that turned out to be very strange. At that exact moment when the car dies, the fuel pressure is at around 3.0 bar (43 psi), which is far too much.

As a result of that it is impossible to drive in slow moving traffic, since it constantly dies at that sort of speed.
Most of the sensors (map, iac etc.) are new and seem to be working. No error messages on the dash.
So, where to look at?
 
Sounds like the fuel pressure regulator is not working properly. It might have a hole in the diaphragm.
 

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