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> MazdaSpeed 3/6 - Fuel, Nitrous & Water Injection

MazdaSpeed 3/6 - Fuel, Nitrous & Water Injection MazdaSpeed 3/6 - Fuel, Nitrous & Water Injection Have a CDFP fuel pump question? Do you want to add Nitrous or Water Injection to your Mazdaspeed 3/6 ? Please come on in!


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 Old 10-16-2017, 02:12 AM   #1
 
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Default High pitched noise after replacing the injectors

Hi guys, we replaced the old injectors (150000km on it) on a Gen 1 with cleaned ones (including upgrade seals). After putting everything together, the car is making this constant, high pitched noise:

https://youtu.be/-A7S5W9GDp8


Is this some kind of injector, fuel, seal problem?
The car's battery is dead, you have to push start it. Dont know if it helps...
I told the guy to install a new battery though...
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 Old 10-16-2017, 07:05 AM   #2
 
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Wow no clue what that is but I would say replacing the battery is a good start.
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The go: Depo racing: downpipe (100 cell count), custom: FMIC. HTP: 3.5" intake, under route piping. JBR: shortshifter, RSB. Autotech: HPFP internals. Go fast bits: hybrid BPV, VMR: 18x8.5 V710s, Bridgestone: potenza re760 245/40/18, KW: v3 coilovers,SPC: camber arms, freektuned, Damond Motorsports: dual OCC, PMM, PCV plate, RMM, TMM, EGR delete, FoSt mani, Corksport: battery box(fuck this thing), injector seals, Cobb: EBCS, AP v3. AEM: methanol. Seibon: carbon fiber hood. UR: catback. Bosch: 3bar. BNR: s4, DNP: EWG manifold, Tial: 38mm mvs EWG.

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 Old 10-16-2017, 10:19 PM   #3
 
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We replaced the battery, but there's still this freaking noise.
Can it be the fuel relief valve?

I dont know if its a mechanical noise (i.e. the relief valve or a bad injector seal) or an electronical noise (a bad capacitor or something like this).
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 Old 10-17-2017, 01:51 AM   #4
 
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We made a second video, where you can hear the noise too:
https://youtu.be/OJOOGhAjn6U

If you pull the plug from the HPFP or the throttle body, the noise continues.
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 Old 10-17-2017, 08:33 AM   #5
 
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That is seriously strange. I’m pretty much lost on this one. You can’t pinpoint where it’s coming from?
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2010 black mica speed3
The go: Depo racing: downpipe (100 cell count), custom: FMIC. HTP: 3.5" intake, under route piping. JBR: shortshifter, RSB. Autotech: HPFP internals. Go fast bits: hybrid BPV, VMR: 18x8.5 V710s, Bridgestone: potenza re760 245/40/18, KW: v3 coilovers,SPC: camber arms, freektuned, Damond Motorsports: dual OCC, PMM, PCV plate, RMM, TMM, EGR delete, FoSt mani, Corksport: battery box(fuck this thing), injector seals, Cobb: EBCS, AP v3. AEM: methanol. Seibon: carbon fiber hood. UR: catback. Bosch: 3bar. BNR: s4, DNP: EWG manifold, Tial: 38mm mvs EWG.

The show: 5% tint all around, 50% tint windshield, rally armor mudflaps, Sony XAV64BT touchscreen headunit, katskin leather interior, CPE relocation plate, Maisonvi weighted shift knob, Corksport hoodscoop, black housing headlights.

Soon:built motor
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 Old 10-17-2017, 11:50 AM   #6
 
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Not really. Its somewhere in the hpfp, fuel rail, throttle body area.
I'm gonna check the relief valve the upcoming weekend.
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 Old 10-19-2017, 04:30 AM   #7
 
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Default

We logged the fuel rail pressure today:
In idle it is somewhere around 435 psi, in WOT somewhere around 1700 psi.

Seems like there is a leak somewhere. Im thinking of the injector seals or the egr block off (we deleted the whole egr pipe).
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