Yes, it will. The PIDs are called short term fuel trim bank1, long term fuel trim bank1, etc.

 

I can't watch the video right now but it sounds like your SAI pump is drawing too much current which puts excessive load on the idling engine. Will need to measure the actual current it sucks when turned on. Shouldbe around 20A or less.

 

When over the course of a couple of days on a road trip half way across the country my Boxster did something quite similar it proved to a bad AOS. On the 3rd day when I started the engine first thing in the morning the thing smoked like a coal fired power plant.

However, the difference was the CEL would come on and stay on and I'd read the code and while I can't remember the code it strongly suggested to me the MAF was at fault. The code was related to air/fuel mixture/adaptation.

'course, it was the AOS allowing unmetered air into the intake that was affecting the mixture.

With misfire error codes though you have to suspect -- as others have already pointed out -- coils and plugs.

 

If the plugs and coil don't do it, look at the MAF as well, a coil problem should show up at more than idle but then again not necessarily.

 

For what is worth ... I have a 2004 C4S for which the CEL started coming on 2 days after I bought it

When I checked for codes I was able to retrieve P0491 and P0492. I could clear the codes and they would stay off for awhile but then the CEL would come on - usually when slowing down from hiway speeds.

I went through the recommended diagnostics checking my SAI and looking for vacuum leaks. I did find a leak in my sport exhaust solenoid but when I corrected that, I continued to get the fault codes.

One of the other potential causes for these codes are bad CATs. Last summer I replaced my oem sport exhaust with some Fabspeed maxflos because my PPI identified a possible loose baffle in one of my cans. When I removed the oem exhaust - they were solid with no rattle. It then appeared that the rattle was coming from one of my CATs, and this was likely the source of my CEL.

Yesterday I installed a set of used fabspeed CAT deletes that I had gotten pretty cheap. (They setup sounds great by the way, but maybe more appropriate for someone young than me - 48.)

It turns out that the insert in one of my CATs was loose and was pushing up against the O2 sensor. Below are 2 pictures my CAT looking in through the O2 orifice. The first pictures shows the insert with a divot in it where it was likely rubbing against the 02 sensor. The second picture is with the inset pushed back to where it should be.



Steve

 

Interesting, it seems P0491 and P0492 can be triggered for a wide variety of faults! To add one more to the knowledge-base, I got a check engine light after slowing down from ~75mph to idle fairly quickly. The engine became rough for a brief time, idle dropped below 700 and the CEL was illuminated. Durametric showed the codes but in my case the issue was that I had dislodged a vacuum pipe while checking the dipstick.
Durametric also allowed me to start up the SAI to exclude this as a possibility.

Anyway, hope this helps someone else.

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P0491 Secondary Air Injection System, Bank 1 - Insufficient Flow P0492 Secondary Air Injection System, Bank 2 - Insufficient Flow Possible cause of fault - Electrical fault in power supply or line between relay and secondary air injection pump - Secondary air injection pump relay mechanically faulty - Mechanical fault in electrical secondary air valve - Pneumatic secondary air valve faulty/sluggish - Electrical fault in secondary air injection pump - Mechanical fault in secondary air injection pump or secondary air injection pump blocked - Vacuum system leaking - Air hose to secondary air injection pump slipped off or constricted
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