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Old 06-17-2009, 11:22 AM   #1
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Default Car started idling high, why?

So even since I MS-1 parallel'd my car and installed my 460's, I got my car to run pretty good. This week it started to idle (fully warmed up) at like 1200-1400RPM. The last time it idled high was because I had a vacuum leak around my injectors due to faulty seals. Since I am parallel'd I can still pass codes. I get codes P0171, and P0172, which are rich and lean codes, and I am not concerned about them. I did, however, get code P0507- idle control system RPM high. I haven't made any changes to my car or burnt anything different to the MS in like 2-3 weeks. Could this be a vacuum leak to the MS? Or maybe a very small leak around the injectors again?
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Old 06-18-2009, 08:05 PM   #2
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what happens if you unplug your IAC?
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Old 06-18-2009, 08:08 PM   #3
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I have the same problem. Haven't been able to figure it out but i've only got one vaccum leak that I can find (TB gasket) and when I put my thumb over it nothing changes. I've just learned to live with it, i'm pretty sure my IAC is toast.
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Old 06-22-2009, 09:00 AM   #4
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I unplugged my IAC and the valve moved, so it is functioning properly. My vac/boost gauge reads 21inHG at idle just as it always did. This is why I think it's a vacuum leak at the injectors. I think it's those little black washer looking seals. Does anybody know the Mazda part number for these things / what they are called?
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Old 06-22-2009, 11:10 PM   #5
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Quote:
Originally Posted by thirdgen View Post
I think it's those little black washer looking seals. Does anybody know the Mazda part number for these things / what they are called?
8574-13-257: INSULATOR, INJECTION

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Old 06-23-2009, 10:13 PM   #6
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Thanks, $3.90 a piece. You're the man Joe.
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Old 07-08-2009, 09:15 AM   #7
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Hey are those little isolators (13-257) the same ones used on RX-7's? I slid these on my 460's and they feel really loose, as in, they'd fall right off if I took off my pintle caps, and there is a lot of side to side movement.
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