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Thread: Engine will not start.

  1. #1
    Join Date
    Aug 2010
    Location
    Dallas, TX
    Posts
    144

    Default Engine will not start.

    The other day I took my car for a ride. It ran fine for the whole time. But when I pulled into my driveway. I let it idle for a few minutes, then the engine quit and I could not start it. I let it sit for a while and tried again, but it still wouldn't start. I winched it into the garage and started checking things. There's no power coming to the fuel pump from the ECU as well as no spark to the spark plugs. I jumped the fuel pump and I worked then, but the car would still not start. The battery is good and turns the engine over robustly. I checked the MSD 6AL and it's good. I also looked at the wiring and found no problems. The engine is a 350 SBC with a Weiand 177 blower and a Holley HP EFI on top of the blower. I'm using a Holley Dual Sync distributor. The car has been running fine for a year till now. My question is: Could this be an issue with the ECU?
    '57 Chevy, 327, Holley HP MPFI, 700R4, 3.73 gears, plus much more.
    '51 Studebaker Starlight Coupe, 350 Chevy, Weiand 177 blower, Holley HP TBI, TH400, Gear Vendors OD, plus much more.

  2. #2

    Default

    Hey Larry. While a sudden bad ECU is possible, I don't believe that it's probable.
    Are you able to hook up your laptop and communicate with the ECU?
    I'd look over all the wiring again. Check your fuses and all relays. Andrew
    IG @projectgattago
    I offer remote Holley EFI tuning.
    I deliver what EFI promises.
    Please get in touch if I can be of service.

  3. #3
    Join Date
    Aug 2010
    Location
    Dallas, TX
    Posts
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    Default

    Thanks. I have checked the fuses, but I did not attempt to connect my laptop to it yet. Good point, I will try that.

    Today I tried to connect my laptop to the ECU, but it would not connect. I tried several times, rebooted
    and so forth, but no luck. I did get the "USB Link", but could not get the "Online". I'm not sure where
    to go from here, perhaps send the ECU to Holley to have them look at it.
    '57 Chevy, 327, Holley HP MPFI, 700R4, 3.73 gears, plus much more.
    '51 Studebaker Starlight Coupe, 350 Chevy, Weiand 177 blower, Holley HP TBI, TH400, Gear Vendors OD, plus much more.

  4. #4
    Join Date
    Jan 2010
    Location
    Brisbane, Australia
    Posts
    2,007

    Default

    ECU is mounted on top of the blower? And no comms now? So could be ECU failure from heat. Gary

  5. #5
    Join Date
    Aug 2010
    Location
    Dallas, TX
    Posts
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    Default

    The ECU is mounted under the passenger seat, the throttle body is mounted on top of the blower. Sorry for any confusion.
    '57 Chevy, 327, Holley HP MPFI, 700R4, 3.73 gears, plus much more.
    '51 Studebaker Starlight Coupe, 350 Chevy, Weiand 177 blower, Holley HP TBI, TH400, Gear Vendors OD, plus much more.

  6. #6
    Join Date
    Aug 2010
    Location
    Dallas, TX
    Posts
    144

    Default

    UPDATE: I called Holley Tech and the guy was quite helpful. I double checked the power inputs to the ECU along with J12A pin 10, which is the switched power input. All showed voltage albeit lower than I would've expected. So then I checked the battery voltage, also lower than I expected, about 10 volts. I have a maintenance charger on the battery all the time when it's not being driven. I double checked the connections and found the fuse was not properly installed in the charger input to the battery. I will let it charge overnight and check everything again. Thanks for the help.

  7. #7
    Join Date
    Jan 2010
    Location
    Brisbane, Australia
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    Default

    Sounds like you do have some electrical woes, and that would cause a no-start condition.
    But with low volts, the cranking speed should be lower, and that should be the giveaway.
    The engine running, then dying, and wouldn't restart could be alternator related. Gary
    Regards, Gary

  8. #8

    Default

    @Larry R: Keep us posted, Larry. Andrew
    IG @projectgattago
    I offer remote Holley EFI tuning.
    I deliver what EFI promises.
    Please get in touch if I can be of service.

  9. #9
    Join Date
    Aug 2010
    Location
    Dallas, TX
    Posts
    144

    Default

    UPDATE #2: I got the battery voltage back to where it's supposed to be. I checked the voltage at both fuses, as well as pin A10 and all were within a few tenths of the voltage at the battery. I checked the fuel pump relay and could find nothing wrong, but put in another one just to check and still no power going to the fuel pump. Is the timer for the fuel pump in the ECU? I could not find any reference to the timer in the schematic so I assume it must be buried in the ECU. Any other ideas will be gratefully accepted. Larry
    Last edited by Larry R; 11-29-2020 at 06:11 PM.
    '57 Chevy, 327, Holley HP MPFI, 700R4, 3.73 gears, plus much more.
    '51 Studebaker Starlight Coupe, 350 Chevy, Weiand 177 blower, Holley HP TBI, TH400, Gear Vendors OD, plus much more.

  10. #10
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    27,451

    Default

    Yes, the default 5.0 second "Fuel Pump Prime" time is a function of the ECU programming (it's software, the relay is hardware).

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