Question about 1989 Ford Taurus

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My 89 Ford Taurus SHO wont start. it appears that my fuel pump does have that," second or so on time " when turning the key on. I was an auto mech by trade 20 years ago, so I did the checks line powering up the fuel pump to see if it would run ...the car didn't start but produced the P.S.I. required.aside from checking fuel pressure I checked for spark with an old gm spark tester called a, "st-125" . I tested the front three plug wires for spark. they did have spark. I checked fusible links, fuses, wiring from the computer to various sensors etc. Iv'e replaced the cam sensor , the ECU, the integrated contol module, I ve tested the resistances of the ignition coils. The next step is to see if I can get to the injectors to see if they are triggering which I don't think they are going to. Can someone help me please? It seems as if information to run the fuel pump or trigger the fuel injectors isn't getting back for inputs to the computer. It couldn't be a valve timing related issue like a streched belt could it? I also checked the compression on the front three cylinder with the throttle wide open, the front three plugs out (the back three stayed in because that side of the engine is tough to get to). it had 150 psi on two cylinders and about 100 on the center front cylinder. when I shot a little oil in the cylinder the compression came up some.I did notice also that the cooling fan runs when everything is connected and the key on.I have to unplug it so it doesn't run the battery down while doin my checks. thank you. fdeborto2633@msn,com

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  • fdeborto2633 Apr 17, 2009

    Ginko, I should have proof read my problem. I said that my fuel pump DID have that one second on time when in fact it DOES NOT.I Have further checks to do. the ones you mentioned. I did power up the fuel pump from both the integrated control module (ICM) and the computer with both the icm and the computer disconnected the fuel pump ran. I also checked resistances of injectors, (each had about 17ohms). AND bfore I connected the new computer I checked other solnoids and relays to make sure no control windings are shorted. please wait to reply to me please. I will do more checks today and will gather more info. If I find the cause I will most certainly let you know. thanks frank debortoli

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  • Ford Master
  • 19,396 Answers

Test also the vacuum system, and connect a code reader to car PCM module

ATD Tools 5657 Deluxe Vacuum/Fuel Pump Tester Kit

Check also the EEC relay in fuse box, it may be failing shortly after starting, cutting power to the pump.

Here OBD1 code readers, standard OBDII readers wont work on this car:

low cost OBD scanner for Ford diagnostic trouble codes

Actron CP9015 OBD I Code Reader- Ford

OBD I Readers

Also test the distributor coils, ensure that there is power to the injectors. Check the air intake, and if there is air intake temp sensor replace it.

Posted on Apr 16, 2009

  • Ginko
    Ginko Apr 17, 2009

    Hi Frank.

    If the pump works when energized on its own, then the fault is restricted to ICM or PCM. Often there is no need to replace the faulty module, but you can have it re-programmed.

    Try to isolate the problem and keep me updated.

    Thanks.


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