Sr20 idle,start,boost, vacline problem! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

rhyshc · 04-04-2013, 04:25 AM

Hello zilvia.net having a problem with my s14 hopefully someone can shed some light!
Was driving to/from work today and when I put my foot down it felt like I hit a brick wall at 4500-5000 rpm and would not crack gate and felt like it was acting as a limiter. So, I tried easing the revs up slowly and would make it past 5000 rpm (went to 6.5k) then I would put foot down and again no gate/boost and would hit a brick wall. However in neutral I can rev freely.

Got home opened the bonnet, had a feel/listen and found a vac line between iacv and plenum to be off
pic showing vac line here: http://i998.photobucket.com/albums/a...psb8ec5c18.jpg

Replaced the line with line as seen in photo above as old one was way too tight to fit back on with minimal room to move my hands.

My understanding is that as I'm building boost it would escape out through that nipple so I thought this would fix my problem.
However now, the car cranks, but doesn't start unless you hold the throttle on and dies if you let go.
I hear a intermittent buzzing coming from under my plenum I'm guessing this could be the iacv solenoid
There's a purple plug for the iacv that I tried to remove to make more room to put line back on however I never got it off

update
4/4/2013
ive cleaned iacv, car idles WHEN you unplug either side of the circled vac line. it runs from plenum-plenum. kind of pointless, really.. anyway, they both have vacuum obviously but as soon as i plug it back in it dies. ideas?

04-04-2013, 04:25 AM	#1
rhyshc Join Date: Apr 2013 Location: Perth, AUS Age: 32 Posts: 3 Trader Rating: (0) Feedback Score: 0 reviews	Sr20 idle,start,boost, vacline problem! Hello zilvia.net having a problem with my s14 hopefully someone can shed some light! Was driving to/from work today and when I put my foot down it felt like I hit a brick wall at 4500-5000 rpm and would not crack gate and felt like it was acting as a limiter. So, I tried easing the revs up slowly and would make it past 5000 rpm (went to 6.5k) then I would put foot down and again no gate/boost and would hit a brick wall. However in neutral I can rev freely. Got home opened the bonnet, had a feel/listen and found a vac line between iacv and plenum to be off pic showing vac line here: http://i998.photobucket.com/albums/a...psb8ec5c18.jpg Replaced the line with line as seen in photo above as old one was way too tight to fit back on with minimal room to move my hands. My understanding is that as I'm building boost it would escape out through that nipple so I thought this would fix my problem. However now, the car cranks, but doesn't start unless you hold the throttle on and dies if you let go. I hear a intermittent buzzing coming from under my plenum I'm guessing this could be the iacv solenoid There's a purple plug for the iacv that I tried to remove to make more room to put line back on however I never got it off update 4/4/2013 ive cleaned iacv, car idles WHEN you unplug either side of the circled vac line. it runs from plenum-plenum. kind of pointless, really.. anyway, they both have vacuum obviously but as soon as i plug it back in it dies. ideas? Last edited by rhyshc; 04-12-2013 at 03:44 AM..