S13 Sr20det Idle Misfire, Wierd Humm Noise - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

apexi240sx · 07-12-2005, 03:28 PM

Anyone Seen This Problem In Their Sr20det Motor??? Well Mine Recently Started Giving This Problem, It Misfires Under Idle Also When The Car Is In Gear But Off The Gas PedaL. Not Only That It Has This Wierd Humm Noise. When I Drive The Car(under Load) Theres No Misfire... But It Dosent Accelerate As Good. I Changed The Plugs, Gapped Them Corecetly (.35-.32 In.) Also Swapped Coil Packs, Also Messed With The Cam Angle Sensor, But Problem Is Still There. Could Anyone Help??

g2ic02 · 07-12-2005, 04:03 PM

clean your mafs and check your tps voltage

apexi240sx · 07-17-2005, 03:14 AM

i fixed this prob, it was cause i removed the valve cover breather hose to the intake, i had a breather filter on the valve cover and capped off the intake... this obviously threw off the MAFS and caused the engine to misfire, so i put the hose back and back to oil in my hotpipe/intake system

.... ( i have to do this cause i have a megan manifold and i cant run the stock oil catch can anymore) so for u fellas wondering to put a breather filter on ur valve cover(sr20det), dont do it unless u have a custom mafs or standalone ecu!!!

Silverbullet · 07-17-2005, 08:07 AM

will it really make that much of a difference, because i dont think a whole lot of air is traveling through it? im acutally having a similar problem.

07-12-2005, 03:28 PM	#1
apexi240sx Zilvia Member Join Date: Sep 2004 Location: Las Vegas, NV, San Fernando Valley, CA Age: 43 Posts: 255 Trader Rating: (0) Feedback Score: 0 reviews	S13 Sr20det Idle Misfire, Wierd Humm Noise Anyone Seen This Problem In Their Sr20det Motor??? Well Mine Recently Started Giving This Problem, It Misfires Under Idle Also When The Car Is In Gear But Off The Gas PedaL. Not Only That It Has This Wierd Humm Noise. When I Drive The Car(under Load) Theres No Misfire... But It Dosent Accelerate As Good. I Changed The Plugs, Gapped Them Corecetly (.35-.32 In.) Also Swapped Coil Packs, Also Messed With The Cam Angle Sensor, But Problem Is Still There. Could Anyone Help??

07-17-2005, 03:14 AM	#3
apexi240sx Zilvia Member Join Date: Sep 2004 Location: Las Vegas, NV, San Fernando Valley, CA Age: 43 Posts: 255 Trader Rating: (0) Feedback Score: 0 reviews	Fixed i fixed this prob, it was cause i removed the valve cover breather hose to the intake, i had a breather filter on the valve cover and capped off the intake... this obviously threw off the MAFS and caused the engine to misfire, so i put the hose back and back to oil in my hotpipe/intake system .... ( i have to do this cause i have a megan manifold and i cant run the stock oil catch can anymore) so for u fellas wondering to put a breather filter on ur valve cover(sr20det), dont do it unless u have a custom mafs or standalone ecu!!!

07-12-2005, 04:03 PM	#2
g2ic02 Zilvia Junkie Join Date: Jul 2003 Location: minnesota Posts: 480 Trader Rating: (3) Feedback Score: 3 reviews	clean your mafs and check your tps voltage