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Intake air system problem, electricity breakdown.

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Old 05-09-2016, 04:46 PM
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Intake air system problem, electricity breakdown.

Hello, I have a problem with my RX8.

You can notice it only on cold engine start after car hasn't been driven, when I start car ''on a road'' I don't have that kind of electricity breakdown. After I flip car key to second position air pump starts working incorectly, as you can hear on a video it starts and stops many times and you can notice with that - electric power noise on the car, even with RPM pointer jumping just a litle bit. I have already check all cables from air pump to PCM and everything is connectet properly.

Help me solve this problem. Is there any chance that something could be badly connected or is it pump air failure?

Video:


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Old 05-09-2016, 04:52 PM
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Check the air pump relay....If you wire 12V to the air pump does it run properly?

It could be the trigger wire to the relay from the PCM has a bad connection...or there is another bad connection someplace to the relay.

It could also be the pump...but it seems to just be tripping on and off
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Old 05-09-2016, 05:01 PM
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Thank you for your respond.

Could you be more specyfic which cables should I check? I have already looked to PCM all wires and they looks like those are connected just fine.

Do you think it may be problem, perhaps with one cable which goes from PCM to air pump or somethink like that? I have a problem understanding what you exacly mean in english.
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Old 05-09-2016, 05:05 PM
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The air pump runs a lot of current...so there is a relay to turn it on and off...it is under the ECU

I would unplug the air pump connector on the right side fender...the big 2 wire connector and wire it straight to the battery. If it runs properly and sounds like a hair dryer basically the pump is good. If it runs the same as the video the pump is screwed

Personally if it was me I would just disconnect the stupid thing
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Old 05-09-2016, 05:21 PM
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I get it now I'll check air pump that way later on.

What's going to happend if I dissconnect air pump? Will car be working properly?
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Old 05-09-2016, 05:51 PM
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All the air pump does is heat the Catalytic converter up faster when the car is cold...so basically it is just for emissions

It doesn't do anything functional
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Old 05-10-2016, 08:02 AM
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Maybe air pump malfunction on cold engine start becouse I do not have catalytic converter in my RX8.
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Old 05-10-2016, 08:12 AM
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it will cause a check engine light if you remove it, FYI.
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Old 05-10-2016, 08:43 PM
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Originally Posted by ZiG View Post
it will cause a check engine light if you remove it, FYI.

I'm sure he has one already with no CAT
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Old 05-12-2016, 04:39 PM
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To be specific, I have already got two:
P0410 -Secondary Air Injection System Malfunction
P0139 - Oxygen Sensor Circuit Slow Response

Do you think that replacing car with new CAT will fix that kind of trouble codes?
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Old 05-22-2016, 03:29 AM
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check the mass cable from batery


the cable reconect the white thing from the -
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