Question about 1995 Ford Aerostar
95 aerostar 4.0L EFI 109k --- OBD I, code #556 '' Fuel pump relay primary circuit failure.'' ------- Engine runs (idels & accelerates fine for 10 min.) Then runs ruff and rich untill stalls. Restart - Will go back to normal operation then will return to poor. I exchanged the fuel pump circuit relay--- same results. Any suggestions?
Might check the coolant sensor. Make sure it is reading correctly. If it is still reading cold on your coolant sensor it will tell the computer to run as if it were cold telling the computer to send more fuel when in fact it doesnt need any because the engine is already warmed up.
Posted on Sep 06, 2009
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Posted on Jan 02, 2017
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