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no spark....help please

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no spark....help please

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Old

Aug 15, 2011 | 12:44 AM

#1

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no spark....help please

so i did a motor swap and i dont have any spark. the car cranks over but no spark at all. all grounds are connected. i also have power at the coil packs. my cam and crank sensors are connected. i'm thinking it has to be the grounds to the back of the heads but they look fine. could it be anything else im forgetting?

Thanks

Last edited by Ryan Armstrong; Aug 15, 2011 at 09:54 AM.

Old

Aug 15, 2011 | 04:55 AM

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Quote:

Originally Posted by Ryan Armstrong

so i did a motor swap and i dont have any spark. the car cranks over but no spark at all. all grounds are connected. i also have power at the coil packs. my cam and crank sensors are connected. i'm thinking it has to be the grounds to the back of the heads but they look fine. could it be anything else im forgetting?

Thanks

One reason for no spark when cranking is a damaged crank position sensor.
The coil packs have one black wire, which is ground. They also have a +12V wire, I think it is pink. Check they have 12V always.

I had a swapped Malibu with that same problem. It was a damaged crank sensor wire, because it goes very near where the engine mounts are located, I think it was crushed when installing the motor.

Fixed the wires and it started right away

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Aug 15, 2011 | 06:57 AM

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No power to the system when the key is in the start position??

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Aug 15, 2011 | 09:53 AM

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ok ill check that. no with the key on i have power at the coils, yet i have no spark

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Aug 15, 2011 | 06:50 PM

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And..

Quote:

Originally Posted by Ryan Armstrong

ok ill check that. no with the key on i have power at the coils, yet i have no spark

is there power there in the START position?????
Do you have a tach signal???

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Aug 15, 2011 | 07:24 PM

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ya with the key in the start position i have 12v at the coils. not sure about the tach signal??

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Aug 15, 2011 | 10:21 PM

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Quote:

Originally Posted by Ryan Armstrong

ya with the key in the start position i have 12v at the coils. not sure about the tach signal??

Does your tach needle move during cranking? Should move off the seat while the starter is spinning.

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Old

Aug 16, 2011 | 07:36 PM

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so i figured it out. it was a messed up wire to the crank sensor. it fired right up after i fixed that.

thanks for the help!!

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