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Fuel problem w/ 87 ford ranger
Sent to Car Experts July 21 01:50 AM

problem with 87 ford ranger w/ 2.9 v6 getting no injector pulse and not turning on fuel pump changed TFI, ECM, ECT, relay, pick-up coil, TPS, MAP, wire harness, inersia switch, and fuel filter; when grounding relay pump turns on but no injector pulse any idea's where to look next?

Customer (name blocked for privacy)
Status:  Closed   Value: $25
Answer
July 21 5:32 AM (3 hours and 41 minutes and 32 seconds later)
         
REPLIEDCheck Mark
Sounds like a problem with the EEC relay or it's power supplies. that relay is responsible for powering up all of those functions.
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Hammer Time -- L1 Master Technician -- 98% Positive Feedback on 2714 Car Accepts
ASE Mastertech with Adv level Engine performance cert.
Reply
July 22 12:14 AM (18 hours and 42 minutes and 14 seconds later)
         
Reply to Hammer Time's Post: check that relay and it is working, this has been a major problem trying to find out what is telling the ecm to shut down the fuel system, if you have any other suggestions I would be glad for the information, THANKS.
Customer (name blocked for privacy)
Answer
July 22 6:17 AM (6 hours and 3 minutes and 29 seconds later)
         
ACCEPTEDCheck Mark

There is nothing in the computer that shuts down the fuel pump. That is merely the default status of a circuit that is not being energized by the proper inputs, mostly supplied by the EEC relay. How did you come to the conclusion that circuit is operating properly?

The EEC relay is energized by the ECM supplying ground when it sees a reference signal from the distributor. You would have to test it but a bad pick up in the distributor could prevent that.

Here a schematic if it helps you.

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Edited by Hammer Time on July 22 2005 at 6:33 AM
Picture
Hammer Time -- L1 Master Technician -- 98% Positive Feedback on 2714 Car Accepts
ASE Mastertech with Adv level Engine performance cert.
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