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Old 06-08-2010, 06:31 AM   #1
dutchy805
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Default Engine starting mystery???

A few weeks ago in Murwillumbah I helped a guy to start his Falcon which I heard cranking twice with no indication of spark. When I noticed the vehicle was a manual I told the driver to put it in first, let the clutch out and turn the key after which, I warned him, the car would move forward, which it did. I intended this action to simulate clutch starting however almost immediately after the car started rolling the engine started and off he drove. My question is - why did the engine start? What difference did being in gear and rolling make to the ignition system? Some years ago in Melbourne I did the same with a woman driving a Fiat which had stalled and blocked both lanes at peak time and I intended this action to just get her car off the road but it's engine started also.

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Old 06-08-2010, 06:33 AM   #2
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The battery was flat.
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Old 06-08-2010, 08:12 AM   #3
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Not enough amps and volts in the battery to crank and have enough to fire the spark plugs as Monty said flat battery.The engine started because when you put the ignition on and you push the car in gear it turns the engine with the wheels instead of the starter motor.The spark is given from the battery and the alternator to start the engine.Next time try using second gear it turns the motor easier because of the ratio in the gear box.
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Old 06-08-2010, 11:04 AM   #4
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Quote:
Originally Posted by JK EX CHASER
Not enough amps and volts in the battery to crank and have enough to fire the spark plugs as Monty said flat battery.The engine started because when you put the ignition on and you push the car in gear it turns the engine with the wheels instead of the starter motor.The spark is given from the battery and the alternator to start the engine.Next time try using second gear it turns the motor easier because of the ratio in the gear box.
Exactly right. Went spotlighting last night, and after fetching a rabbit we came back to the old Suzuki realizing we left the lights and spotty on.. bit of a jog behind the car never hurt anyone.
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Old 06-08-2010, 11:53 AM   #5
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Quote:
Originally Posted by bobuleh
bit of a jog behind the car never hurt anyone.
you sure?
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Old 06-08-2010, 11:57 AM   #6
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HAHAHA... was that ever going to work?
they didn't get hurt tho.. o.O
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Old 07-08-2010, 12:18 AM   #7
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Quote:
Originally Posted by Mr Hardware
you sure?
bwaahhaahhhah rolmfao
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Old 07-08-2010, 03:56 AM   #8
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I think dutchy is saying that the car moved foward, in gear, while cranking the engine. Not a roll start, as in get the car moving, in gear, with foot on clutch then pop the clutch to start it, but a key in-gear start.

dutchy, no idea why this worked when starting out of gear wouldn't.
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Old 07-08-2010, 04:58 PM   #9
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Yeh that's what he's saying JC. Put it in gear, no clutch, turn the key. Bunny hop along until it starts.
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Old 07-08-2010, 05:00 PM   #10
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hahaha.. crack up of a vid Mr Hardware!!
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Old 07-08-2010, 05:26 PM   #11
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hahaha.. crack up of a vid Mr Hardware!!
Yeh total crack up. looks like he's just replaced all front panels after a front end collision, now its just a short trip to the paint shop - "you hop in love, we'll all push you up the ramps". Watch the bonnet pop up, its totalled again.
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Old 07-08-2010, 05:43 PM   #12
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Quote:
Originally Posted by JC
I think dutchy is saying that the car moved foward, in gear, while cranking the engine. Not a roll start, as in get the car moving, in gear, with foot on clutch then pop the clutch to start it, but a key in-gear start.

dutchy, no idea why this worked when starting out of gear wouldn't.
compression start imho.... enough oomph for a spark then bang... it is how i start my dune buggy every time, dumping the clutch= compression lock up, drag me around the paddock for a week just bum dragging locked rear wheels. towing me in gear while engine putts along waiting for spark to ignite fuel = start
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