Air Pump Question

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Jan 2, 2003 | 11:49 AM

Prolene

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From: SoCal

Air Pump Question

Interesting that the air pump will allow flow either way when it is turned off (I bench tested it). Anyone know if there is a valve or valves downstream to prevent exhaust gasses from flowing into the intake, or is the pump on all the time?

Jan 2, 2003 | 12:23 PM

cdelena

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From: WA

There is an air control valve back by the firewall.

Jan 2, 2003 | 12:41 PM

Gernby

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Is the pump necessary, aside from emissions? It seems like it would be a good candidate for weight reduction...

Jan 2, 2003 | 01:36 PM

cdelena

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From: WA

[QUOTE]Originally posted by gernby
[B]Is the pump necessary, aside from emissions?

Jan 2, 2003 | 01:50 PM

Gernby

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Quote:

Originally posted by cdelena

Even if you don't care about the emissions you need the pump to avoid a MIL and it is hard to monitor for other problems if the lamp is always lit.. and in most states you need to avoid a MIL to pass inspection.

I am concerned about emissions to an extent, but not necessarily enough to worry about LEV compliance in a state that doesn't require it. Looking at the Check Engine Light would bother me.

Jan 2, 2003 | 08:32 PM

Prolene

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From: SoCal

Thanks, cdelena! I tried running the car without the air pump for a bit, and as expected, the Mugen ecu gives no mil (cel). I don't recall ever hearing the pump as I did preMugen ecu as well, so perhaps the new ecu disables the pump.