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  1. #1
    Join Date
    Jun 2016
    Location
    Reno
    Posts
    7

    Default No crank no start after engine swap

    Hey yall I need help troubleshooting. I replaced the engine in my 2003 xc70. Got everything hooked back up again and tried to start it for the first time. No crank no start. Battery is brand new. Where should I look first?

  2. #2
    Join Date
    Jun 2016
    Location
    Reno
    Posts
    7

    Default

    Nevermind. I had the spade connector on the wrong post on the starter. Now Im getting crank but no start. Hahah

  3. #3
    Join Date
    Feb 2011
    Location
    Windy Manitoba
    Posts
    630

    Default

    At least that's progress!

  4. #4
    Join Date
    Apr 2017
    Location
    San Diego
    Posts
    94

    Default

    Fuel, spark, compression. Probably easiest to check in that order. For fuel, add an external source, i.e. small amount of starter fluid shot into the intake. Do you get fire? If you get fire on external fuel, you know you have spark and compression; therefore, you likely have a fuel issue. If you don't get fire on external fuel, it doesn't mean you don't have a fuel issue. There must be some other issue with spark or compression, but the fuel issue is inconclusive until you fix the others. For spark, pull a coil and put a test spark plug in the coil. Have someone crank the engine while you carefully ground the plug on the engine. Got spark? If not, you have a spark issue. If you do get spark, you could still have some other issue with timing of the spark (ignition timing), but at least you know the circuitry is working. For compression, the usual compression test.

    Brett

  5. #5
    Join Date
    Feb 2010
    Location
    Virginia Beach
    Posts
    3,877

    Default

    If I recall correctly, the injectors won't pulse unless the ECU registers spark.

    In other words, you can have fuel pressure at the rail, but no fuel going into the car if there is a spark problem.

    So, I would listen for the very faint whine of the pump when you turn on the key, check rail pressure, then check spark. There might be one other wire incorrectly connected...
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  6. #6
    Join Date
    Apr 2017
    Location
    San Diego
    Posts
    94

    Default

    For the OP, the external fuel test still stands and is very quick (probably takes 2 minutes) and doable without a fuel pressure test gauge if you don't have one. You can quickly and easily verify if the rest of the system (spark and compression) is working. Listening for the fuel pump is a very good idea. If you don't hear it running, you definitely will have a fuel problem. If you don't hear it, I would probably start with the fuel pump relay and fuses. You can swap in another identical working relay from some other system to quickly check the relay. Don't ask me where the fuel pump relay is. I don't know.

    Brett

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