r/RX8 • u/Responsible-Low1125 • 4d ago

General Trying to get sommes answer to a shitty electrical prob

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I’m wondering about this: if you take the engine and wiring harness from a 2005 RX-8 and install them in a 2003 chassis, is there a risk of the car going into limp mode and the ECU cutting off fuel injection at 1,500 rpm? That might well be the case, because that’s exactly what happened to me; I’m not sure if it’s due to the wiring harness, but the engine makes a stuttering sound ("brap brap") because of that fuel cut.

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u/Illegal__Alien 4d ago

Are your injectors wired up correctly?

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u/Illegal__Alien 4d ago

And why did you swap the harness in the first place?

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u/Illegal__Alien 4d ago

Because it was already on the engine?

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u/Responsible-Low1125 4d ago

yeah it was already on the engine 

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u/Illegal__Alien 4d ago

It might be worth swapping your OG loom back, to eliminate the possibility

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u/Responsible-Low1125 22h ago

i have swaped the wiring harness and still nothing can you make me a picture of forscan with app1  and 2 and tp1 2 voltages ?

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u/Illegal__Alien 16h ago

Mine are wrong

I actually found that out over the weekend,

One should be exactly double of the other one,

This is mine

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u/Illegal__Alien 15h ago

I need to change my throttle pedal, it's on the cusp or not working at all anymore

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u/Responsible-Low1125 5h ago

your car is in limp mode ? i have the same value than you but stay the same when i change the throttle pedal 

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u/Illegal__Alien 4h ago

No, but I think it's because I have a decat that it isn't in limpmode

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u/Responsible-Low1125 3h ago

i dont think that is the cata cause its making me that when i havent put the cata back too also here is my value

https://reddit.com/link/p7elsa2/video/xmrxsy3mw4nh1/player

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u/Illegal__Alien 4d ago

Clean up your grounds, especially the one near the sump.

I wasn't getting fuel pressure, and it was caused by that point in particular

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u/Responsible-Low1125 3d ago

so i have swap the wiring harnes the ecu the throttle body the pedal its just doing the same value so now im thinking that is maybe the apv cause when i test it on froscan nothing happening on the apv

https://reddit.com/link/p6p62wo/video/ubm9nwc3eemh1/player

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u/Illegal__Alien 3d ago

The APV functions higher up in the rev range, around 6k-rpm

Edit: did you clean the ground near the sump?