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Big Al's Teenage Dream 300zx


AALAWS

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  • 5 months later...
  • 2 weeks later...

I've been trying to fix the idle with varying success.
It's been sitting at around 2000rpm, even at a warm idle, so I got a second hand IACV. I stripped it down and thoroughly cleaned it and fitted it on Friday.

IMG_1323.JPG.fefe82c988d164da71202f8e5fe62810.JPGIAA_AR.jpg.fb65f5a1b4dccdbd60e21a63d6e37ee2.jpgFICD_AAC.jpg.89c932dfcd984f011c47700990cfd95b.jpg

I let it run up to temperature, unplugged the ACC solenoid and tried to use the Idle adjust screw to drop it down to the recommended range - even done right up - nothing changed. If all things went to plan, the idle would have been around 650 and then raised to the reccomended base idle of 700 with the ACC reconnected. This not working suggests either an issue with the throttle bodies or a vacuum leak.
From there I checked the angle of the TPS and managed to get it to drop to around 1000rpm, but once I got it home after it got a bit warmer it was idling back at 1500rpm - a overall drop of 500 from before so a small victory.

Today, after some more reading,  I checked the resistance across the solenoids on both the new and old IACV's and ran 12v across them to see if they clicked and engaged. They all ran about 2 Ohms above the recommended but still engaged so no major issues there?

"First off, check the solenoid resistance (don’t forget to clean the connectors first, as your readings won’t be accurate on an old corroded connector).
FICD => ~22 Ohm
AAC => ~10 Ohm".        Mine were about 24 and 12 ohms

I then cleaned the throttle bodies and checked they were correctly aligned. The passenger side intake hose had a small crack, once everything was clean I smeared a little gasket goo over it just to be safe.

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And the result after all this?  Idle is now down to 1200rpm and the radiator fan isn't kicking in as loud too which is a bonus. Still not 700rpm resting idle though.....
next? clean out the air regulator? pressure test for a vacuum leak? If I'm going to fit a decent exhaust I don't want to have a loud drone on idle.

I'm a total noob at this so learning as I go - any Z32 guru's out there with some answers?

 

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