GT350 starting problem

Discussion in 'GT350 and S550 Technical Forum' started by YellowJacketBoss302, Feb 17, 2018.

  1. YellowJacketBoss302

    YellowJacketBoss302 TMO Race

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    i am having an intermittent starting problem. Happens mostly when hot. When I push the start button I hear what I think is the fuel pump run but starter does not spin. After cooling down a while it will start.
    Anyone have any similar issues?
     
  2. barstowpo

    barstowpo TMO Intermediate

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    Any messages on the screen?
     
  3. YellowJacketBoss302

    YellowJacketBoss302 TMO Race

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    Sometimes it says "push clutch in to start". But.... clutch is in and little yellow light on the start button is on. It comes on when clutch is in so car seems to know that clutch is in.
     
  4. VoodooBoss

    VoodooBoss Rick Moderator

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    No issues with mine. Have you checked the cables to make sure they are tight?
     
  5. spartan

    spartan TMO Race

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    There is a clutch sensor that activates when the clutch is fully engaged. I have had similar issues and had to fiddle with the sensor. Might be worth a try.
     
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  6. barstowpo

    barstowpo TMO Intermediate

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    It almost sounds like the car isn't seeing the key fob. You could try taking out the batteries and putting them back in. Also check the connection for the secret key receptacle in the console. If that is not connected or is loose, the car won't start.
     
  7. YellowJacketBoss302

    YellowJacketBoss302 TMO Race

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    Thanks. I THINK the clutch sensor is OK since the little light on the start button comes when the clutch is fully depressed.
    I will fiddle with the key receptacle and the sensor, too just in case.
    .....just tried to start with no key fob and got a "no key decked" error message, so I think the fob is ok.
     
  8. bpracer

    bpracer Mark

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    It could be something old fashioned like the starter brushes hanging up.

    In that case, smack the starter with a large hammer while somebody hits the starter button.

    A little easier to do on an 80's 3/4 ton Suburban than a GT350, I know... but...
     
  9. Black Boss

    Black Boss TMO Addict

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    Check voltage at the starter relay. I had a similar issue on my Boss. Turned out to be a bad solder joint on the starter solenoid. It's close to the headers and would create an air gap when hot. Closed as it cooled. Took forever to diagnose
     
  10. YellowJacketBoss302

    YellowJacketBoss302 TMO Race

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    Thanks. Will try all the above. Black Boss your symptoms sound almost exactly like mine. Where do I find the starter relay? Is it on the starter?
     
  11. Black Boss

    Black Boss TMO Addict

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    Starter relay is I'm the under hood fuse box. Check the manual exact position. I had zero volts hot, then as the gap closed in the joint the voltage steadily climbed over 30 minutes or so.

    The other dirty check is to lean down and wiggle the harness on the back of the starter, when the engine is hot, while having someone try to start the car -- watch your hand and the heat from the manifold
     
  12. YellowJacketBoss302

    YellowJacketBoss302 TMO Race

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    starter relay pic small.jpg Found the starter relay. Will try to post picture here. Pulled the relay out and measured pin 3 to ground. Had voltage. Replaced relay and engine started. Afterward there were no problems for several days -- until a track day. Since the track day there are intermittent problems when both hot and cold. It seems like fiddling with the relay (remove and replace, etc) helps, but not always.
    Car is at dealer now for thermostat problem (second time). Hopefully it will fail to start while there and they can diagnose.
     
  13. YellowJacketBoss302

    YellowJacketBoss302 TMO Race

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    Car did fail there. They replaced the starter. No starting problems since. Thermostat did fail again! Will continue in different thread.
     

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