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Misfiring while spraying

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Old May 5, 2018 | 01:54 PM
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Default Misfiring while spraying

I have the NOS mini and LNC2000. I'm running a Dynotune wet kit with a 62N with 32F at 950psi bottle pressure. I have the mini programmed to only spray 65% so its roughly a 100 shot and I have 4*of timing pulled. I have a racetronix fuel pump/hotwire kit and I'm using br7s. The other day I noticed that the car stumbles from 50-65 while its locked up and under heavy load. It does feel like a plug is completely shot, but it studders and stumbles. After 65, it drives fine. At WOT on motor, it feels great. When I spray, it falls on its face and stumbles and misses like crazy. What could this be? Plug wires? It makes me scratch my head how it stumbles and misses on spray but not on motor at WOT
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Old May 5, 2018 | 02:18 PM
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You have checked the plugs then?
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Old May 5, 2018 | 02:27 PM
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Originally Posted by HCI2000SS
You have checked the plugs then?
No I haven't, but it started stumbling at low RPMs like this before I ever tried to spray it. It does perfect at WOT on motor but runs like crap when it's being sprayed. I've only sprayed it once. I'm about to order some MSD wires to put on it
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Old May 5, 2018 | 02:49 PM
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Is it getting enough fuel while being sprayed? Demand goes up a BUNCH during spraying.
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Old May 5, 2018 | 02:57 PM
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Originally Posted by G Atsma
Is it getting enough fuel while being sprayed? Demand goes up a BUNCH during spraying.
Its a cam only car with a 255 racetronix pump. I don't have my fuel pressure gauge yet but I would think it's getting plenty of fuel with this setup
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Old May 5, 2018 | 03:19 PM
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I'd start by checking the plugs. Did you gap them?
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Old May 5, 2018 | 03:51 PM
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Originally Posted by HCI2000SS
I'd start by checking the plugs. Did you gap them?
Yes at 35
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Old May 5, 2018 | 07:18 PM
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As said before, sounds like a plug issue to me
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Old May 5, 2018 | 09:49 PM
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Originally Posted by Jtm2085
As said before, sounds like a plug issue to me
I agree but it's weird because it started doing this before I ever tried spraying the car. I'm going to swap wires and then if that doesn't fix it then I'll change plugs. These plugs have less than 2k miles on them
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Old May 6, 2018 | 08:52 AM
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Default Ignition Coils + Coil Dwell

Hi 97, I ask you to tell us what ignition coils you have fitted AND their coil dwell time.

I would fit FireCore 250 SPW

Did you use Silicon Dielectric on the SP Boots ?
Do you have the Metal Shield over the boot ?

Lance
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Old May 6, 2018 | 09:34 AM
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Originally Posted by Pantera EFI
Hi 97, I ask you to tell us what ignition coils you have fitted AND their coil dwell time.

I would fit FireCore 250 SPW

Did you use Silicon Dielectric on the SP Boots ?
Do you have the Metal Shield over the boot ?

Lance
It's got stock coil packs and stock plug wires. I didn't use any grease or anything when I changed plugs. Yes I have the metal shield over the boot
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Old May 6, 2018 | 02:08 PM
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Originally Posted by Pantera EFI
Hi 97, I ask you to tell us what ignition coils you have fitted AND their coil dwell time.

I would fit FireCore 250 SPW

Did you use Silicon Dielectric on the SP Boots ?
Do you have the Metal Shield over the boot ?

Lance

why did you ask about the grease and metal boots
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Old May 7, 2018 | 11:28 AM
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Default Current Leak Correction

Hi LT-1 the use/elimination of the stated items reduces HV current leaks.

Lance
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Old May 7, 2018 | 11:51 AM
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Have you pulled the plugs yet?
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Old May 7, 2018 | 02:11 PM
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Originally Posted by Jtm2085
Have you pulled the plugs yet?
No, I haven't had a chance to. I work 7-7 Monday-Friday and live an hour away from home so the weekends are the only time I have a chance to. Its weird because 50% of the time, the car drives fine under heavy load at low rpm but the other 50%of the time, it misses under heavy load at low rpm. It seems to start doing it after I've been driving for 20-30 minutes
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Old May 7, 2018 | 09:12 PM
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most likely a plug issue. My tbss was popping on a 200 shot. Added a new set of br7ef gapped a .32. Fixed all my issues!
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Old May 7, 2018 | 09:14 PM
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Originally Posted by brandon6.0
most likely a plug issue. My tbss was popping on a 200 shot. Added a new set of br7ef gapped a .32. Fixed all my issues!
That's what has me scratching my head because these were a brand new set of BR7EF's gapped at .036 and it started stuttering at low rpm before I ever even tried to spray it. Like I said, it does fine on motor at WOT but it runs like dogshit on spray
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Old May 8, 2018 | 04:23 PM
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Try spraying a full 100 shot without using the progressive. See how this does.
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Old May 8, 2018 | 04:25 PM
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Originally Posted by brandon6.0
Try spraying a full 100 shot without using the progressive. See how this does.
Tried that yesterday. Same result. I also tried ramping it in from 25% to 85% of a 150 shot over 3 seconds and same result
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Old May 8, 2018 | 04:30 PM
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Originally Posted by 97TAsom
Tried that yesterday. Same result. I also tried ramping it in from 25% to 85% of a 150 shot over 3 seconds and same result
Why arent you going to 100%?
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