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post #1 of (permalink) Old 03-11-2004, 06:05 PM Thread Starter
 
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Wiring TBI - crank signal question

My instructions for my TBI system say I can attach the crank signal wire to a terminal on my starter solenoid. Anyone know which terminal? I assume one of the small ones; I have a blue wire coming off one and a red wire coming off the other.

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post #2 of (permalink) Old 03-11-2004, 07:48 PM
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Re: Wiring TBI - crank signal question

1. Huh....
2. A signal has to come from a pulse...
3. The pulse for a TBI usually,
4. Comes from the ignition module,
5. The same one that produces the spark...
6. What type of TBI?
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post #3 of (permalink) Old 03-11-2004, 10:18 PM
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Re: Wiring TBI - crank signal question

I'm thinking the "S" terminal on the starter solenoid. I think what the instructions are trying to accomplish is to get a "voltage" to the ECM when the ignition switch is in the "START" position. I saw a similar type of instruction on the Edelbrock MPFI system I wired up on a Chevy 454.
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post #4 of (permalink) Old 03-11-2004, 10:34 PM Thread Starter
 
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Re: Wiring TBI - crank signal question

GM throttle body.

Sorry Leve, I think I am messing up terminology a bit. The ECM does get it's trigger pulse from my MSD box. The wire I am wondering about evidently needs to be "installed on the crank terminal of the starter solenoid or off the ignition switch"; it goes on to say that a signal is provided to the ECM from this wire only when the engine is cranking. The ECM uses this signal to allow the fuel pulse width to be expanded for cold start up fuel enrichment.

Which is the "S" terminal on the solenoid? The little one on the battery cable side or the one on the ground side?

Clear as mud? [img]images/graemlins/grin.gif[/img]

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post #5 of (permalink) Old 03-12-2004, 05:03 PM
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Re: Wiring TBI - crank signal question

You had the term right, That's what GM calls it.

On mine, it's the one on the battery side, I believe. It's whichever one has the wire that runs to the start position on your ignition switch. It 'Signals' the ECM that you are 'Cranking', and the ECM responds with the beginning of the injection sequence.

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