88 help!!!

[swampdonkey]

hey im currently working on my 1988 bronco 5.8L and have replaced (since buying) the sparkplugs and wires, distributor cap, alternator, batery and terminals, and oil/ filter. at first it ran fine then broke down cuasing me to do the appove. now it turning over but cant keep started its like im not getting fuel to the mix. also right before it broke down it would start "jumping" and even with pedal to metel woldnt break 25mph im outa ideas and need help!

 

[Rons beast]

Hey SD,

welcome,

So the Bronc starts but idles rough and dies?

Are you running with a Fuel Injection unit? If so check fuel preasure. Could be a clogged filter or worn out pump. Was the truck sitting for a time before you bought it? Did you happen to try to pull ant trouble codes?

 

[swampdonkey]

i didnt pull codes yet but i did just purchase a new fuel pump and filter. my friend and i have decided its one of the fuel pumps possibly the internal one. but what codes should i look for to varify. and yes its 5.8L windsor with efi, i have no idea if it was sitting though doubt it bc the guy was driving it around wiht no problems and was straight forward with mechanical issues he was aware of and showed paperwork to varify.

 

[miesk5]

yo,

Try a Self Test for Diagnostic Trouble Codes (DTC)s by my pal, BroncoJoe19

http://broncozone.com/topic/14269-code-reader/page__pid__74587__mode__threaded

The engine temperature must be greater than 50° F for the Key On Engine Off (KOEO) Self-Test

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Vacuum Leak Test; see my post @ http://broncozone.com/topic/22770-low-idle/

excerpts;

On an idling engine check for vacuum leaks using a mechanic's stethoscope with the probe removed, or a ~3' garden hose section. BEWARE of fab, belts, pulleys and hot engine/hoses.

On COLD ENGINE only, use propane torch w/rubber hose attached, UNLIT (have fire ext @ hand for all tests)

or spray carb cleaner, when it gets to the the leak the RPMs will rise.

Also check: vacuum hoses; intake manifold gasket & throttle body and lower intake;

Vacuum Tree

PCV line

Air Diverter Valve (AIRD) from TAD Solenoid & Air Bypass Valve (AIR BPV) from TAB Solenoid or a Air Bypass Valve (AIR BPV) & Air Diverter Valve (AIRD) Combination located behind the intake manifold

vacuum reservoirs

AC, heater, defroster, vent control ckt & vacuum tank (plastic ball, or an irregular box glued to the evaporator cover), under dash & lines to heat/blend/etc. doors; & HVAC vacuum reservoir;

Carbon Canister (Charcoal Canister, Vapor Canister, Evaporative Emission (EVAP) Canister for the Evaporative System

Fuel Pressure Regulator (FPR)

and line to & Cruise Control sys in 86-91

leaky O-rings around the fuel injectors are allowing air to leak past the seals.

worn throttle shaft

& Line to & the power brake booster, Master Cylinder & Booster