Possible Idle Control Problem (stalling)

A Q45 forum / Cima forum for the President of Infiniti's lineup. Brought to you by Infiniti Parts USA, your OEM source for Q45 parts!
Posts: 6
Joined: Tue Nov 10, 2020 3:45 pm
Car: 1999 Infiniti Q45

Possible Idle Control Problem (stalling)

Postby logmanQ45 » Fri Jun 18, 2021 7:36 pm

Hey guys was just about to spend some money on wheels and coils and ect. when yesterday I was driving around town and my rpms started dipping all the way down to 200 rpms and then completely stalling. The car behaves absolutely fine when above 1000 rpms and starts up fine, I don't have any codes until of course I stall and then all my lights go on. I saw a post about similar conditions about an idle control valve however I was hesitant about messing with it because A) in those posts people mentioned it was temperature related and mine is not and B) They mentioned messing with it caused their engine to idle at 2K rpm which obviously I don't want. Any advice or things I can try before I bring it in for a diagnostic, poor mech E college kid here lol.

3Q Jay
Posts: 2395
Joined: Sat May 08, 2004 6:23 pm
Car: 94Q45a, 95Q45a (mine)
97Q45t (sold)
01 B15 Sentra (Daughter's)
2010 A6 Avant (also mine)
Location: Florida Coast

Re: Possible Idle Control Problem (stalling)

Postby 3Q Jay » Sat Jun 19, 2021 9:00 am

more likely its the MAF.
But let's not guess (even though an educated guess). Get your IACV duty cycle (warm idle park, warm idle drive, warm idle AC compressor spinning), and also let's see your MAF voltage over RPMs.

Return to “Q45 Forum / Cima Forum”