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  1. M

    High idle? Pulsing or surging RPM on deceleration? Here's the solution (probably) -

    I've been driving myself crazy trying to figure out why my daughter's P5 idled at 1500 rpm and would pulse (or surge, or jump around, or go up and down) on deceleration. After finding that turning the air adjustment screw (AAS) all the way in had no effect (still high idle), and checking for...
  2. M

    PCM (ECU) is officially dead - options for replacement?

    Hello All, After finally getting my daughter's P5 running well (see thread here), after about 100 miles, it started back with a high idle (only 1500 RPM this time) and a new twist - an RPM fluctuation on deceleration. This thing is driving me crazy! So, double checked for vacuum leaks and...
  3. M

    Extreme high idle (3000 rpm) on cold start - driving me nuts!

    UPDATE *** Replaced the "new" IAC with a genuine Mazda IAC (part #FSN5-20-660B) and the car now idles just as it is supposed to in all phases. No more racing to 3000 rpm! Car now runs great! Just goes to show you that some aftermarket parts, though they say they are OEM replacements (and even...
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