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Thread: no spark or fuel pressure?!?

  1. #1
    Join Date
    May 2003
    Location
    Toms River NJ
    Posts
    279

    no spark or fuel pressure?!?

    ok.. i have had low fuel pressure for a while now... and my CEL has come on for a good 2 weeks (hooked it to a scanner wouldnt let it do a "run test") finally 2days ago i pulled to a stop sign n it just shut off nice n smooth... (wouldnt restart, up shift light flickered, stayed on for only one time i tryed 2 crank) i pushed it into a parking lot.. next day i came back "0" fuel pressure.... no spark either, trys 2 turn over just dosnt... no up shift light ne more and i dont smell gas... im 85% sure i hear the pump whine... what do u think?

  2. #2
    Join Date
    Oct 2002
    Location
    Covington, WA
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    491
    check the EEC ground by between the battery and the core support

  3. #3
    Join Date
    Jan 2006
    Location
    Medina
    Posts
    8
    checking the EEC ground is a good place to start but i wonder y u think u here the fuel pump whine but have no pressure. something is not right there. does ur fuel gage not work or r u hearing something else? also how do u know u dont have any spark? did u use a tester or did u do the " hold the boot close to a ground check"? u could very well have a bad crank sensor. if the pcm doesnt recieve a signal from this u will not have neither fuel or spark. try this. cycle the ignition to run, not start, and count three seconds. then turn it off and right back to run for three seconds. do this three or four times. this will make the pcm command the fuel pump on for start-up and u'll have a better idea of what is wrong.

  4. #4
    Join Date
    Nov 2005
    Location
    El Paso, TX
    Posts
    192
    lack of pressure could be the regulator gone bad, but that's not likely. Have you changed the fuel filter lately? They can collapse and create this exact issue.

    As for the spark issue if it is trying to crank then it is getting some spark. Check your cam sensor and crank sensor. No doubt if that issue gets straight it will start and you can diagnose further and more accurately

    Ray

  5. #5
    Join Date
    Jun 2003
    Location
    Vancouver, Washington USA
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    1,740
    Doesn't the PCM shut off the fuel when there is no signal being sent by the crank sensor? I thought it did this for safety reasons..

  6. #6
    Join Date
    Aug 2005
    Location
    Central Arkansas
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    921
    yes, no crank sensor means no fuel pump. Same is true with an LX distributor. I had one go bad on me once, and it took forever to diagnose. Turns out my distributor was shot and not triggering the fuel pump. I sudgest a fuel pressure guage and reading it while having someone cycle the key from run to off. If you have pressure when it goes to run, you have an ignition issue, probably crank sensor.

  7. #7
    Join Date
    May 2003
    Location
    Toms River NJ
    Posts
    279

    "0" pressure....

    that main ground for the ecu checks out ok ...i have 0 pressure when i turn the key 2 the "on" position w/o starting... i have no pressure when doing it like u said turn it 2 the on then back then on still "0" pressure... i also did the hold the boot 2 a ground... (2 check the spark) (its a new cam sensor also,new filter,less then a month old,same with the dis mod) also new plugs n wires(x-mas ) that crank sensor n balancer are only about a yr n half old.. but i guess it could be the crank sensor even though the up shift arrow isnt on ...

  8. #8
    Join Date
    Nov 2005
    Location
    El Paso, TX
    Posts
    192
    test the fuel pump by grounding this terminal, with a jumper wire to any good ground. This will test most of the circuit, and make a definite decision on whether the pump is making any pressure.
    Attached Images Attached Images  

  9. #9
    Join Date
    May 2003
    Location
    Toms River NJ
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    279

    ???

    ? cum on lol what harness plug is that and location?

  10. #10
    Join Date
    Nov 2005
    Location
    El Paso, TX
    Posts
    192
    It's the EEC connector(diagnostic) connector, mounted behind the passenger side fender well. Should have a black or grey cap on it that says EEC IV. In the diagram it's called a self-test connector.
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  11. #11
    Join Date
    May 2003
    Location
    Toms River NJ
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    279

    using the jumper...

    when i grounded it the pressure was 34ish still low but it did have pressure when jumping it... couldnt turn over batt. is near dead.. so what does this mean a relay is bad or the computer is shot?

  12. #12
    Join Date
    Jun 2003
    Location
    Vancouver, Washington USA
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    Maybe some hit the Fuel Cut Off Switch (Located in the trunk area). Hit the reset button and see if that works...

  13. #13
    Join Date
    Nov 2005
    Location
    El Paso, TX
    Posts
    192
    Really sounds like a bad cam or crank sensor man. I would go there first. If it happens to be something else you can always return the part.



    BTW, 34 psi isn't all that bad on a dead battery.

  14. #14
    Join Date
    May 2003
    Location
    Toms River NJ
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    279

    fuel cut off switch...

    it isnt tripped for me 2 "reset" it... no but about the fuel pressure, 24psi is right around were its at when driving and i let off the gas (anything past 40psi) it cuts out, cant be the cam(brand new motor) ne other test 2 narrow it down more.. (bad pump) etc?? or crank sensor?

  15. #15
    Join Date
    May 2003
    Location
    Toms River NJ
    Posts
    279

    could it be...

    could it be a relay thats bad or the ECU (thats bad?) i dont hear ne of them clicking

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