RB26dett idle problems

[240zdan]

I have a slight issue with my rb26 idle.The motor starts up and idle fairly low, then the idle slightly raises after a few seconds. Id say it raises to about 900-1000rpm or so. When I drive the car, and let off the gas and come to a stop, idle drops to 500rpm then after a few seconds raises back up to 1000.I have cleaned the factory "grease" off the tbs, but adjusted the stops to compensate. The butterflys are closing all the way.The BOV is recirced back into the intake. I adjusted to have it on the loosest setting to make sure the air is actually dumping back into the intake.The mafs are about 8" away from the turbo.The isle is set to about 5-600rpm with the IACV plug disconnected.I get no codes whatsoever.Is there anything that causes the idle to drop after letting off the gas and coming to a stop? Sometimes its really bad, other times its moderate.At one point the engine was actually stalling as well. Could my IACV adjustment screw be intoo much, and the ecu does not raise the idle back up until it sees its very low?

[maryjane]

have you adjusted the adjustment on the iac valve located under the intake plent? you can adjust the idle using a flathead screwdriver. my 26 would shut down after getting on it so i turned the idle up some and it fixxed the problem

[FAST-DATSUN]

Clean the IAC and check all the hose routing to it......