Check the battery condition, battery state of
charge and starter motor current draw. Replace the battery if marginal
and the starter motor if the current draw is beyond specification.
Check the battery cable condition. Clean the battery terminals and replace corroded or damaged cables.
Check the fuel system for proper operation. A
fuel pump with insufficient fuel pressure or clogged injectors should
Check the engine's tune-up status. Note the
tune-up specifications and check for items such as severely worn spark
plugs; adjust or replace as needed. On vehicles with manually
adjusted valve clearances, check for tight valves and adjust to
Check for a failed coolant temperature sensor, and replace if out of specification.
heck the operation of the engine management systems for fuel and ignition; repair or replace failed components as necessary.
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Injectors may not be receiving signal to open, have you had your ECU Hooked up to diagnostics and checked the injector signal plugs?
(you will need a set of injector test lights, these can be had in a kit for around 40 bucks on ebay, as for diagnostics you may need to take it to a ford dealership or service center if you don't have a diagnostic tool)
from:milton wright.your 1988 5.0 mustang with automatic trans.the dip stick should be under the hood,on the passenger side next to the fire wall.look down! check with the engine running,transmission in park!
the ecu is located on the passenger side under the dash along the kick panel.the connector for the ecu is under the hood on the same side and it is held to the ecu that sticks out a little with a single bolt.this system used an 90 wire plug,and is bolted to the firewall with 2 bolts.
it may need a little adjust in the ignition switch not the key cylinder but the electric switch it is located in the steering column under dash and is hold by two screws you will need a 5/16 wrench to loose these screws and push the switch a little to the front then tight the screws
i hope this help you fix it i'll be happy to assist you if you have further questions please let me know if this was useful.
Click the key forward BUT don't start the car listen for fuel pump to pressurize and shut off. But if the pump keeps running change the fuel pump relay switch under drivers seat. If its pressurizing and shuts off then its not your fuel pump. Fuel pressure at rail when idling is 30 psi.
Let me know what happens cause I know alot about Stangs had 2 5.0
The PCM, ECU (engine control module, powertrain control module, brain box, etc.) is located underneath the airfilter assembly. Remove the accordian hose attaching the intake to the air box then remove 2-3 bolts securing the airbox in and you will see it sitting underneath there.