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I have a 05 sti with no spark at coil pack 1 and on 4 I only

Customer Question
get spark one time but...
I have a 05 sti with no spark at coil pack 1 and on 4 I only get spark one time but when I unplug the cam sencer i get spark and it will fire up but runs rough
Submitted: 1 year ago.Category: Subaru
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Answered in 2 hours by:
12/20/2015
Subaru Mechanic: Mike V., Subaru Technician replied 1 year ago
Mike V.
Mike V., Subaru Technician
Category: Subaru
Satisfied Customers: 25,892
Experience: Certified Subaru Technician, factory trained by Subaru.
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Hi there,

Do you still need assistance with this?

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Customer reply replied 1 year ago
Yep
Subaru Mechanic: Mike V., Subaru Technician replied 1 year ago

Has the engine recently been replaced or any other work on the car other then what you have listed?

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Customer reply replied 1 year ago
I just rebuilt it
Customer reply replied 1 year ago
All grounds are on
Subaru Mechanic: Mike V., Subaru Technician replied 1 year ago

You need to double check your timing. Since it will run without the cam sensor plugged in, and it runs rough, you likely have a timing issue going on.

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Customer reply replied 1 year ago
It's spot on I've had the cover off to many times to count all marks are where they should be
Subaru Mechanic: Mike V., Subaru Technician replied 1 year ago

Can you shoot me a photo of the timing marks?
Especially the crank sprocket?

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Customer reply replied 1 year ago
It won't let me load them but the single marks line up with the timing case and doubles line up with the pullies
Subaru Mechanic: Mike V., Subaru Technician replied 1 year ago

Ok, some of the crank sprockets have 2 marks, make sure you are using the timing mark on the cog on the back of it for the belt. If you use the mark on the face of the crank sprocket, it will put you off a few degrees. This might be what you have going on here With the cam sensor plugged in, it's actually seeing the timing. The cam sensor is the one sends signal for fuel injector pulse and for spark. Unplugged is more of a default and the car will run. I believe this may be the issue. The cams sound like they are on the money, but if the crank is off just a bit, then it's going to make the cam timing off when it's running.

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Customer reply replied 1 year ago
It is on the money as well
Customer reply replied 1 year ago
Yep it's on as well
Subaru Mechanic: Mike V., Subaru Technician replied 1 year ago

My only other thought would either be a security system type of issue or the remote possibility that maybe the IVT harness is connected to the cam sensor, like maybe you have those crossed, otherwise, I will have to open this back up for the other guys to see if anyone has an idea or has dealt with it.

Did you rebuild this or have it rebuilt at a machine shop?
I am asking because I have seen times where the cam sprocket was switched and not reading right, but in this case it would have to be from a different engine, not something you would likely do unless you did an engine swap or head/cam swap of some sort.

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Customer reply replied 1 year ago
Nope I built it at the house it has the same one that came off it
Subaru Mechanic: Mike V., Subaru Technician replied 1 year ago

Sorry, I am going to have to open it back up for the other experts. Please don't reply to me or it will lock it to me.

We have a few other Subaru guys on here that are good and may have seen this.

Sorry I couldn't help!

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Mike V.
Mike V.
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Satisfied Customers: 25,892
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