I was driving my truck today and its an 87 Bronco II. If i get the pedal on the floor or anywhere past half way it started to hesitate. When i got home i popped the hood and noticed i had a disconnected vacuum line. i fixed that. it still seems to have less power. i have performance plugs, wires, coil, cap and rotor, i did have a performance module but i broke it(long story) and then i put the stock one on(this was over the weekend) could it be the stock module holding it back?
if it is a 2.9, make sure the vacuum line going from the fuel pressure regulator to the intake doesn't have any gas in it, if it does, your regulator is shot. Also, you might want to see if their is any codes in the computer. You can find how to check the codes at www.fordfuelinjection.com
its not the regulator i checked that. its not really a hesitation more of a sputter. it doesnt do it in neutral even if i rev to 6k but it will do it in any gear if im past half throttle. i really think its my stock ignition module going bad. It had a sputter like this before and i had put an Accel performance module, accel coil, accel cap and rotor, taylor thundervolt 8.2 wires, and bosch platinum+2 plugs on and it stopped it from sputtering but now that i broke the accel module and put the stock one back on it has started again so i am thinking that is the problem and nothing else
The ignition system shouldn't have anything to do if it revs fine to 6k in nuetral, I'm thinking it has something to do with the engine being under load. My guess is that either your Throttle Position sensor or MAP is going bad.
What do you mean by stock module? The stock computer?
no the module that is mounted on the distributor. this problem has only occured with the stock module and never happened with the accel module on. but i was forced to put the stock module back on after i cracked the accel one somehow and since that day it has sputtered
I had a hesitation/sputter, especially when cold, than turned out to be a bad O2 sensor. I started my diagnosis by pulling codes from the computer, which is an important first step on an '87 since it doesn't have a CEL for the computer to tell you when it sees a problem. The first two things I would do would be to pull codes from the computer and check fuel pressure.
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'87 Bronco II XLT 4x4 & '92 Explorer XLT 4x4 & '98 Chev Suburban K1500 SLT 4x4
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