car won't hold idle (searched)

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HOMEMADE240SXTURBO
Posts: 238
Joined: Sun Sep 03, 2006 2:51 pm
Car: 1989 NISSAN 240SX KA24E
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^^^ the car was idling fine but not running right at boost when i first pulled up to the dyno then after he got it tuned and running right, it won't idle after boost. he's telling me that something may be wrong with the iacv. is there anything that i can do to the iacv to make it hold my idling? is there anything that i can do to make it hold the idle after boost?


scotttak
Posts: 737
Joined: Wed Mar 17, 2004 12:30 pm
Car: 94 Honda Civic
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try turning the idle screw counter clockwise some. its near the back of the intake manifold.

scotttak
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Joined: Wed Mar 17, 2004 12:30 pm
Car: 94 Honda Civic
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yeah i blocked it all of. im pretty sure i plugged all the lines also.

180sx
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Joined: Thu May 08, 2003 3:25 pm

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FUNNY... the other day i took apart my plumbing trying to go blow-through with n60. Did not think ahead n60 maf is 3" in diameter and my cold pipe is 2.75" and i have no 3"to 2.75" reducers on hand. So i just put it all back together...Just how it was with the old maf.But i also changed my spark plugs to autolite copper core and re-gapped em to .40(had .35 on 6e's COPPER'S before).

Car does exactly as yours now.But I did have it running like a clock before so wtf right?

I went and pressure tested the plumbing..old egr blockoff was hissing..ok,fixed it. Still here and there drop down to 300 at idle and stall coming off boost or high rpm. Irratic idle continues, from 700-1500rpm. And when just started cold/warm it goes up to 1500rpm for like 10sec and drops down to 0rpm and shuts off if i don't step on gas. And i mean doesn't even stumblle 1 bit, just face down to 0rpm and shuts off.I have idler valve wide open to the max. And my idle reading at 900rpnm is -14.Before at 800 rpm i had -17 or so. Makes me think idler valve is the bastard here.Other possibilitie so far: bad plug/gap combo.(oem is .44 now at .40) handles boost just fine so i assume gap wouldn't affect idle that much if i don't blow out under boost (14psi).

Coming down to just making a decent intake mani AND get rid of nissan valves all together. Meanwhile i am just going to adjust the idler screw all the way and keep throtle plate 10% open .

also u can move up tpc to .52 or so.


Modified by 180sx at 2:06 AM 7/24/2007

300datsun
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Joined: Wed Oct 29, 2014 10:10 pm
Car: 1988 nissan 300zx
1990 Nissan 240sx

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My 1990 Nissan 240sx with the same things deleted but it has a custom fuel rail and exhaust manifold with a walbro fuel pump eBay t70 master power turbo eBay intercooler 300zx maf 550 Bosch fuel injectors tial bov and waste gate won't stay on longer than 3 seconds unless I rev the balls out of it I've been stuck on trying to find why it wont hold an idle and was wondering if you ever figured out your problem it as well will run with the maf unplugged I'd greatly appreciate the help

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WDRacing
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Car: 95 240SX, 99 BMW 540i, 01 Chevy Express, 14 Ford Escape
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Make a new thread and include as many details as possible.


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