Question about 1990 Honda Civic

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1990 Honda Civic LX-1.5 engine. No power to fuel pump and no spark from distributor. Is there anything that would cause both to go out at the same time? I've checked all fuses with voltmeter on both terminals in the box under the dash and under the hood - they have power on both terminals of each fuse. The main relay (under dash at driver's knee) only clicks 1 time instead of 3. I also have a wrecked 90 Honda Civic with same engine so I've swapped main relay, computer, and even the entire distributor with the other one to no avail. Any ideas - besides send both to scrap yard?

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  • pencew01 Jun 22, 2009

    I can't 100% rule out the ignition switch but at least the check engine light, oil light, etc comes on when I crank the engine over. The compression is good (timing belt has less than 5,000 miles on it), spark plugs and wires have less than 500 miles on them (one spark plug wire did foul 500 miles ago). The check engine light stays on when I turn the switch on - where it used to go out after a few seconds, but no trouble codes light up on the Engine Control Computer. The Crankshaft position sensor, ignition module and coil (located in the distributor) were changed when I swapped distributors (I can't 100% rule out that the other distributor didn't go bad while sitting up after my wife wrecked the first 90 - It did work and I was able to drive the first 90 home after the wreck - just the left front tire didn't run anything like it was supposed to). The MAP sensor controls the fuel flow rate, spark timing, as well as the idle speed, but does it cut off the power to the fuel pump completely as well as the spark? I'll change it out and see.

  • Raymond Ramirez
    Raymond Ramirez May 11, 2010

    there might be a crank sensor or cam sensor

    this is what tells the ecm to send a spark and turn on the fuel pump to load up the rail or?

    no dont scrap them either... its a good car just a sensor issue also the map sensor also... since you have a spare parts car lets change them all



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Ignition switch?

Posted on Jun 22, 2009

  • Clint Smock
    Clint Smock Jun 24, 2009

    Do you have a wiring diagram for the ignition system? Also the Map sensor won't cause no spark.


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This is a tough one. The relay one click is bugging me. do you hear the fuel pump when you turn the ignition to on?

Hummmm csmock has a point

Posted on Jun 22, 2009


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