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Can't Roll Start?

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by clinton_hedrick, Mar 5, 2013.

  1. clinton_hedrick

    clinton_hedrick New Member

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    I left the dome lights on in my truck a few weeks ago, and it was completely dead (I usually only drive my truck 1 or 2 times a week). Luckily, I thought, I was parked on a hill and had plenty of room to roll start it. I turned the ignition on and had plenty of speed to turn the engine in 3rd gear, but it wouldn't start. I had a long hill so I tried twice, and again, the engine turned, but no spark, so I eventually had to jump it.
    I tried to roll start it today (with a full battery), and when I engaged the clutch, my Security light came on the warning center thing. Is there supposed to be a security sensor that doesn't allow you to roll start on a 2000 Sierra 1500 or do I have a bad sensor? Thanks
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  2. RayVoy

    RayVoy Active Member

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    Hmmm, interesting.

    This may be a stupid question, but was the key in the run position? The security is in the key/cylinder
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  3. clinton_hedrick

    clinton_hedrick New Member

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    Yep. My dash lights were on, It was showing that i had it above 1500 rpm, speedometer was working, I can't figure why it wouldn't send a spark to the engine
    #3
  4. RayVoy

    RayVoy Active Member

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    Haha, I knew it was a stupid question, but it had to be asked.


    EDIT:
    I looked in your owner's manual ........... the clutch must be depressed for the engine to start.
    Last edited: Mar 5, 2013
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  5. clinton_hedrick

    clinton_hedrick New Member

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    Ah, I must have missed that. Thanks. Well, that sort of defeats the one of the advantages of a manual transmission. I wonder, If I disengage the clutch right after I engage it, it may start?
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  6. j cat

    j cat Active Member

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    the jump starting or using jumper cables on a dead battery is not good for the electrical system. the battery should be charged with a charger until full. then start vehicle.I would expect if the battery is 3 years old or more to be a problem within a few months. also the alternator may get damaged from this heavy charging and the normal loading of the vehicle electrical system.
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  7. clinton_hedrick

    clinton_hedrick New Member

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    I was in a hurry, so I didn't have time to properly charge it. I haven't had problems with the batt/alt since then. It's just my old beater, if something would go bad with the starter or something else, I just want to be able to park it on a hill and go. Dad and I have had lots of trucks and tractor that are roll start only :lol:
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  8. tbplus10

    tbplus10 Moderator

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    It is possible to put in a clutch engage defeat switch, I saw the directions on another site but since my Chevy is an auto I didnt pay much attention to them.
    One of the only manufacturers in the last few years to use a clutch engage defeat switch is Toyota. Dont know why it isnt at least an option or part of a package on other manufacturers 4x4's.
    On my Tacoma I've used it more than once to roll start the truck and on a few occasions to crawl out of spots where I was stuck but didnt feel like pulling out the winch cable, the starter has a much lower crawl ratio than the running truck engine, you just have to make sure you dont run it to long and burn things up.
    #8
  9. RayVoy

    RayVoy Active Member

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    Not always convient.

    There is sufficient internal resistance in the battery to protect the vehicle being boosted and the vehicle providing the boost. It is, however, a good idea to turn off things like HVAC fan(s).

    I guess the position that most of us take, if the procedure is good enough for GM to provide "how to" in the owner's manual, then, it should be ok for the average driver to use it.
    #9
  10. redvett

    redvett New Member

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    The clutch switch only prevents the starter from turning not if you roll start the vehicle. If the battery is too low the truck will not start.
    #10
  11. stchman

    stchman New Member

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    If you dis-engage the clutch, the engine won't spin.
    #11
  12. RayVoy

    RayVoy Active Member

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    That is a probability, I do not have a wiring diagram to check.
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  13. clinton_hedrick

    clinton_hedrick New Member

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    That's what I thought. You should only have to disengage the clutch to turn the starter. But I've roll started completely dead vehicles, but it doesn't matter, I have tried to roll start the truck even with a god battery
    #13
  14. j cat

    j cat Active Member

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    you need more than 9 volts to get the vehicle to start on a pop the clutch roll start. these vehicles need lots of amps when / to run like my 2000 requires about 50 amps with all lights ac off.

    as far as farm equipment goes that's not my area for sure. if the small engine has magneto then you need no battery power.
    #14
  15. RayVoy

    RayVoy Active Member

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    j cat, a rolling start won't work with a charged battery either so the depressed clutch does more than disable the start relay. It is connected to the security system and disables the entire ignition.
    #15
  16. j cat

    j cat Active Member

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    your correct on the clutch being depressed as that must be all the way down to permit start . just as automatic must be in neutral/park to allow a start condition. you would have to jump out the clutch switch . if your fast enough with the clutch I bet it is possible.
    #16
  17. clinton_hedrick

    clinton_hedrick New Member

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    I tried pumping the clutch in & out, and I got going a little faster and took my engine up to almost 3k rpm, but no good. The security light flashes. I guess it isn't a big deal now, the truck starts fine for me every time (given I dont leave a light on)
    #17

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