1995 Bronco Fuel Issue

[the JUICE box]

My bronco will start just fine and take off like normal, but when going down the road it will lose power no matter how hard I push on the gas. All I have to do is pull off the road, turn it off for a few seconds, start it back up and start the process all over again. It feels like the pump isn't pushing as much fuel through as it needs but it's not cutting off totally. Got any ideas?

 

[Rons beast]

Hey Juice , Welcome

Have you checked for trouble codes? (I'm assuming you have a 95?)

Could be a few things. First check the base timing. Remember to disconnect the spout connector.

A check of fuel preasure at the rail will rule out a pump or filter issue. The preasure should be between 30 and 45 psi with the engine running and the vac line to the regulator off and plugged.

You could have a clogged exhaust. Attach a vacuum gauge to a manifold vac port and run the engine from idle to about 2000 rpms and hold steady. At the higher rpms if the vacuum drops below about 15 you have a restriction that is not allowing the engine to breathe.

Other problems could exist; a trans problem. poor or contaminated fuel, weak lifter/s, worn cam, injector issues.

Do the basic checks and report back.

Good Luck

 

[BroncoJoe19]

I agree with Ron... check your fuel pressure. You may have a clogged filter.

You may also want to consider a clogged CAT.

HowTo diagnose a plugged catalytic converter

BogHog... Use a vacuum guage, good explanation.

To diagnose a plugged catalytic converter, you can check intake vacuum or exhaust backpressure. To check intake vacuum, connect a vacuum gauge to a vacuum port on the intake manifold. Start the engine and note the vacuum reading at idle. Then increase engine speed to about 2,500 rpm and hold steady. Normal vacuum at idle for most engines should be 18 to 22 inches Hg. When the engine speed is increased there should be a momentary drop in vacuum before it returns to within a couple of inches of the idle reading. If the vacuum reading is lower than normal and/or continues to drop as the engine runs, it probably indicates a buildup of backpressure in the exhaust. Remember, though, that intake vacuum can also be affected by ******** ignition timing and valve timing. What's more, some engines are much more sensitive to small changes in intake vacuum than others, so checking backpressure rather than intake vacuum may give you a better indication of what's going on

Another suggestion by BogHog was to remove the EGR valve or the O2 sensor in front of the Cat (which will allow the exhaust gases an avenue of escape) and see if the engine runs better. If it does, the Cat is plugged.

Plugged Cat test with pressure guage...