idle dips when I shift - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Enjuku Racing · 08-16-2007, 08:41 AM

either you have a problem with a vacuum leak or you have a problem with the bov. If you have a friend that works at a dealership or tech shop, see if they have a smoke machine and fill your system up and you should be able to find the leaks. This is the easiest way to find them. Hope it helps you out man.

240AM · 08-16-2007, 09:54 AM

The reason your car drops to 500rpms on shift is because your bov is venting air that has already been metered, out to the atmosphere. When you do this your ecu tells the injectors to put more fuel in then is actually needed and the car will overly richen for a second causing the motor to bog. You need to either, recirculate your bov behind the maf or run a blow thru maf. Whether you realize it or not, even when you think you aren't boosting your bov may still open a little when you shift due to the sudden pressure change.

08-16-2007, 08:41 AM	#1
Enjuku Racing Zilvia.net Advertiser Join Date: Feb 2002 Location: Clermont, FL Age: 41 Posts: 3,049 Trader Rating: (29) Feedback Score: 29 reviews	either you have a problem with a vacuum leak or you have a problem with the bov. If you have a friend that works at a dealership or tech shop, see if they have a smoke machine and fill your system up and you should be able to find the leaks. This is the easiest way to find them. Hope it helps you out man. __________________ Office: 352-241-8399 / 1-888-SR20DET (772-0338) YouTube.com/c/EnjukuRacingParts http://www.enjukuracing.com [email protected]

08-16-2007, 09:54 AM	#2
240AM Join Date: Jul 2007 Location: Midsouth Posts: 32 Trader Rating: (0) Feedback Score: 0 reviews	The reason your car drops to 500rpms on shift is because your bov is venting air that has already been metered, out to the atmosphere. When you do this your ecu tells the injectors to put more fuel in then is actually needed and the car will overly richen for a second causing the motor to bog. You need to either, recirculate your bov behind the maf or run a blow thru maf. Whether you realize it or not, even when you think you aren't boosting your bov may still open a little when you shift due to the sudden pressure change. __________________ http://www.driftopia.com