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Old 07-23-2015, 06:21 PM   #1
03mach1ne
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m issfire after nitrous install

I've been trying to figure out what is causing this misfire on cylender 5 i believe. There is a wire that i think the guys that installed my nitrous put in that tins from cylender 5 coil pack and the other side goes into the fire wall where all the other wires for the nitrous enters the firewall. If I hold the wire in a certain position the misfire will go away but always comes back. Any ideas on what this wire is going to? I've already chnged coil packs and spark plugs.
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Old 07-23-2015, 09:07 PM   #2
SHAKN' 04
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Re: m issfire after nitrous install

Spark plug gap?
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Old 07-24-2015, 11:38 AM   #3
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Re: m issfire after nitrous install

take a picture of what you are talking about. Did they use those stupid plastic splicing adapters or solder the wire in? The plastic pieces are quick and easy but they simply suck! I solder all my connections, period.
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Old 07-24-2015, 11:46 AM   #4
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Re: m issfire after nitrous install

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Originally Posted by TKat13 View Post
take a picture of what you are talking about. Did they use those stupid plastic splicing adapters or solder the wire in? The plastic pieces are quick and easy but they simply suck! I solder all my connections, period.
+1 agreed
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Old 07-24-2015, 12:51 PM   #5
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Re: m issfire after nitrous install

Gapped at .35. Heat range 6. There's a wire going into the passenger side coil cover that the people that installed my nitrous put in and it seems to be causing the problem. Any ideas for what this wire is? I'll take a pic when I can. They soldered everything
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Old 07-24-2015, 01:01 PM   #6
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Re: m issfire after nitrous install

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Originally Posted by 03mach1ne View Post
Gapped at .35. Heat range 6. There's a wire going into the passenger side coil cover that the people side coil cover that the people that installed my nitrous put in and it seems to be causing the problem. Any ideas for what this wire is?
Do you have a window switch on this kit as well? Some people use this for a tach signal if I recall; I tapped into the tach signal at the PCM.
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Black '04 Mach 1
Track Times (bone-stock w/drs):60 ft - 1.90 | 1/8 - 8.67
(100 shot,E85,4:10s,Street tire):60 ft - 1.67 | 1/8 - 7.88
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Old 07-24-2015, 01:50 PM   #7
03mach1ne
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Re: m issfire after nitrous install

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Do you have a window switch on this kit as well? Some people use this for a tach signal if I recall; I tapped into the tach signal at the PCM.
Yeah that's what it is... any idea how this could cause a misfire?
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Old 07-26-2015, 08:40 AM   #8
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Re: m issfire after nitrous install

I had spark blow out with tr6 plugs at 7.5# boost at .035 gap im @ .025 now and its fine.
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Old 08-01-2015, 04:50 PM   #9
03mach1ne
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Re: m issfire after nitrous install

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Originally Posted by watman02 View Post
I had spark blow out with tr6 plugs at 7.5# boost at .035 gap im @ .025 now and its fine.
ill try that. thanks
i think theres a possibility that the wire that goes to my coil pack for my msd window switch is whats causing my problems. if i move this wire while the car is running the miss will go away but always comes back. i don't really like that they wired it this way anyways because where this wire comes out from under the coil cover it doesn't let it tighten down all the way and I'm sure will let water seep in and mess up my coil packs. i think theres a way to tap the window switch into the ecu. anybody know how to do that?
https://www.youtube.com/watch?v=5lGeb-Vovak this is the video of how the misfire sounds

Last edited by 03mach1ne; 08-01-2015 at 05:14 PM.
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Old 08-03-2015, 04:51 PM   #10
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Re: m issfire after nitrous install

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Originally Posted by 03mach1ne View Post
ill try that. thanks
i think theres a way to tap the window switch into the ecu. anybody know how to do that?
I have always used pin 26 on the ECU.
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Black '04 Mach 1
Track Times (bone-stock w/drs):60 ft - 1.90 | 1/8 - 8.67
(100 shot,E85,4:10s,Street tire):60 ft - 1.67 | 1/8 - 7.88
New build - 750rwhp; not track tested (yet)
Mods: Build Log
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