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Blew the same fuse twice my first track session of the day. Help!

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Blew the same fuse twice my first track session of the day. Help!

 
Old 06-10-2019, 08:34 AM
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Ludicrous_Speed
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Default Blew the same fuse twice my first track session of the day. Help!

I blew fuse #36 during my first track session at Pocono last month and the car went into what sounded like V4 mode with the speed and throttle severely limited and threw several IAT and MAF codes. I had the car towed to the shop to find out the fuse was bad with no apparent underlying cause and went back out onto the track two days ago at Lime Rock only to have the same fuse blow again 5 minutes into the first session. That time I at least swapped the fuse and drove home but does anyone know why this may be happening? According to the owner's manual fuse #36 is for the Engine Outside Position (I'm not even sure what that means). It's a 15A fuse. I made some changes to the car over the winter and I've never had any trouble on the track in the past.

Car is a 2016 M7 Z06. Over the winter I put on an aFe momentum intake, ARH 1 7/8 long tubes/Xpipe with no cats, and Fasterproms expansion tank and had the car tuned.
I also put on a set of 19" wheel all around with Toyo R888R 295/30/19s (0.3" or 1.2% taller than stock) and 345/30/19 (0.5" or 1.9% taller than stock). I noticed the Active Handling coming on often and at strange times. I imagine this is due to the different tires diameters but don't know if it could be related to the fuse blowing.
Runs great and doesn't throw any codes until the fuse blows after a few hard track minutes.

Any insight?

Last edited by Ludicrous_Speed; 06-10-2019 at 11:22 AM.
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Old 06-10-2019, 08:43 AM
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Pluggzz
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Originally Posted by Ludicrous_Speed View Post
I blew fuse #36 during my first track session at Pocono last month and the car went into what sounded like V4 mode with the speed and throttle severely limied and threw several IAT and MAF codes. I had the car towed to the shop to find out the fuse was bad with no apparent underlying cause and went back out onto the track two days ago at Lime Rock only to have the same fuse blow again 5 minutes into the first session. That time I at least swapped the fuse and drove home but does anyone know why this may be happening? According to the owner's manual fuse #36 is for the Engine Outside Position (I'm not even sure what that means). It's a 15A fuse. I made some changes to the car over the winter and I've never had any trouble on the track in the past.

Car is a 2016 M7 Z06. Over the winter I put on an aFe momentum intake, ARH 1 7/8 long tubes/Xpipe with no cats, and Fasterproms expansion tank and had the car tuned.
I also put on a set of 19" wheel all around with Toyo R888R 295/30/19s (0.3" or 1.2% taller than stock) and 345/30/19 (0.5" or 1.9% taller than stock). I noticed the Active Handling coming on often and at strange times. I imagine this is due to the different tires diameters but don't know if it could be related to the fuse blowing.
Runs great and doesn't throw any codes until the fuse blows after a few hard track minutes.

Any insight?
I was there too on Saturday, I mighta seen you but not sure.
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Old 06-10-2019, 09:56 AM
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laserdude2215
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Fuse 36 powers the O2 sensors. The wiring for one of them was likely damaged when you installed the headers.
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Old 06-10-2019, 10:25 AM
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TSLAVette
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Originally Posted by laserdude2215 View Post
Fuse 36 powers the O2 sensors. The wiring for one of them was likely damaged when you installed the headers.
Agree to start here. If a ground is missing or a connection burned, these are exactly the gremlins that you will encounter.
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Old 06-10-2019, 10:02 PM
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Ludicrous_Speed
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Originally Posted by Pluggzz View Post
I was there too on Saturday, I mighta seen you but not sure.
I was the loud DSOM Z06 in B group for about 5 minutes on Saturday morning.

Originally Posted by laserdude2215 View Post
Fuse 36 powers the O2 sensors. The wiring for one of them was likely damaged when you installed the headers.
Originally Posted by TSLAVette View Post
Agree to start here. If a ground is missing or a connection burned, these are exactly the gremlins that you will encounter.
Thanks for the advice. I got underneath the car, dropped the exhaust plate off, and checked the O2 sensors. The passenger side O2 zip ties had melted through and the wire was touching the Xpipe leaving a little bit of residue on the pipe drom the wire insulation. It was burned through just enough to show one or two threads of copper. Iím gonna try some wire shrink wrap and spark plug insulator sleeve with better zip tie placement for the wires and get some exhaust wrap for that segment of the Xpipe.


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