NoPistons -Mazda Rx7 & Rx8 Rotary Forum - engine sputters under load

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rotarycrew

08-30-2008 02:16 AM

ok, so i just put a S5 13b in my first gen. it sputters under load at any more than 1/4th throttle and bogs in neutral.

i've just put on a new MAF, and the fuel pump is new too. any ideas?

ColinRX7

08-31-2008 10:44 AM

Completely factory S5 motor? Injectors, everything? OEM S5 ECU running the car?

rotarycrew

09-01-2008 01:27 AM

correct

ColinRX7

09-07-2008 09:57 AM

I'm not sure what you mean by bogs in neutral. What are the circumstances? You can't rev the car in neutral?

First thing I would do is test the TPS sweep with a multimeter to make sure it's functioning properly. If you're not sure how, you can unplug the TPS and run it. It will send the computer into a fuel map to deal with a failed TPS. See how it runs. Does it make the situation a little better, or alot worse?

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