Ruiz Racing Posted April 26, 2008 Share Posted April 26, 2008 I have 1981 280zx turbo. I just put on a n42 intake and its idling erraticlly after it warms up. Any ideas? Quote Link to comment Share on other sites More sharing options...
83ZXER Posted April 26, 2008 Share Posted April 26, 2008 vacuum leak. Quote Link to comment Share on other sites More sharing options...
BSD Posted April 26, 2008 Share Posted April 26, 2008 Yeah, did you check for vacuum leaks? Quote Link to comment Share on other sites More sharing options...
Ruiz Racing Posted April 26, 2008 Author Share Posted April 26, 2008 i checked all over. i was thinking it had something to do with not having aac valve (auxiliary air control valve) or egr valve. are these parts nessecery for a stable idle on the 81 turbo Quote Link to comment Share on other sites More sharing options...
BSD Posted April 26, 2008 Share Posted April 26, 2008 You can pretty much remove all vacuum lines off the intake manifold actually, I kept the fuel pressure regulator and power break booster, so you are fine.You might just have to adjust your idle..Any case, this might help you out as well.http://vtunnel.us/index.php/1010110A/ hope that helps! Quote Link to comment Share on other sites More sharing options...
83ZXER Posted April 28, 2008 Share Posted April 28, 2008 If you did'nt use new gaskets (tb,intake manifold,cold start injector) then check with some WD-40, if theres a leak it will start to die. Or wait till its warmed up and adjust the air bypass valve. And by the way where does it idle between. Quote Link to comment Share on other sites More sharing options...
hughdogz Posted April 30, 2008 Share Posted April 30, 2008 Heat soaking of the fuel rail / injectors? Do you have a heat shield on the intake manifold, or a thermal coating on the exhaust manifold? My l28ET has lean running problems and high idle if I start it maybe 5-20 minutes it after it has been run hard. Quote Link to comment Share on other sites More sharing options...
DuoWing Posted May 2, 2008 Share Posted May 2, 2008 You can remove EGR, AAC, VCV, even the air regulator if you like. I have not put on my egrless N42 yet, but I'm going to eventually, but I have removed the EGR, AAC, and the VCV. Immediately after doing that my car would idle super low, around 500. It would get shaky and want to die. I needed to up the idle which helped solve the issue. If the car runs fine when cold and you still have an air regulator that would probably be your answer. Air Regulator open while cold, car has extra air to keep idle up and not have problems. Once warmed up air regulator closes your idle is extremely low and will barely keep the car going. You will need to adjust your idle via the throttle stop screw on the side of the throttle body. There is an 8mm nut that holds the screw in place. I found by working with the nut I was just able to get the screw to turn enough that I was able to raise my idle. Car currently idles right around 700-750ish. Quote Link to comment Share on other sites More sharing options...
z or bust Posted May 2, 2008 Share Posted May 2, 2008 I had this problem with mine. Mine would get warm and and when i'd boost it would push the fuel injectors out from the little hold downs because mine were wore out. If that makes sense, its kinda hard to explain. Are you having the problem after you drive it or just when it warms up in your driveway? Quote Link to comment Share on other sites More sharing options...
Ruiz Racing Posted May 14, 2008 Author Share Posted May 14, 2008 it drives fine. it bounces between 750 and 900. you can really hear it because it is strait piped. it only really does it after i floor under load. it never wants to die. my non turbo stays steady just under 1000. im trying to make it the same. i had to adjust when i first put it on to keep it started. it has good power. it goes faster than before. it dynoed at 217 hp 244 tq at the flyweel. strange? Quote Link to comment Share on other sites More sharing options...
DuoWing Posted May 14, 2008 Share Posted May 14, 2008 What have you done to the car besides straight pipe and the N-42 intake? Also have you tried spraying brakleen around the intake manifold to see if you have any leaks? Quote Link to comment Share on other sites More sharing options...
naviathan Posted May 14, 2008 Share Posted May 14, 2008 Sounds like it's breathing. Every ZX I've owned has done that. It could be bad throttle body seals/bushings, a slight leak in the AAC/EGR, a leaky injector is very possible. You never know. Quote Link to comment Share on other sites More sharing options...
DuoWing Posted May 14, 2008 Share Posted May 14, 2008 My ZXT had the breathing thing going on when I didn't have the vacuum lines for the VCM hooked up correctly. As I've learned you don't need any of those. I've blocked off pretty much everything on the ZXT intake. With the N42 being so limited in vacuum ports all you really would need to have hooked up is the Fuel Pressure Regulator, Brake Booster, and the optional charcoal canister if you don't want any extra gas fumes. One thing that just came to mind, if you didn't hook up the charcoal canister, there is a little port on the underside of the throttle body for hooking up one of the charcoal canister lines. If you don't happen to have anything hooked to it, there would be a vacuum leak. Quote Link to comment Share on other sites More sharing options...
naviathan Posted May 14, 2008 Share Posted May 14, 2008 My ZXT had the breathing thing going on when I didn't have the vacuum lines for the VCM hooked up correctly. As I've learned you don't need any of those. I've blocked off pretty much everything on the ZXT intake. With the N42 being so limited in vacuum ports all you really would need to have hooked up is the Fuel Pressure Regulator, Brake Booster, and the optional charcoal canister if you don't want any extra gas fumes. One thing that just came to mind, if you didn't hook up the charcoal canister, there is a little port on the underside of the throttle body for hooking up one of the charcoal canister lines. If you don't happen to have anything hooked to it, there would be a vacuum leak. That port only draws vacuum when the throttle plate is open. Quote Link to comment Share on other sites More sharing options...
S130Z Posted May 14, 2008 Share Posted May 14, 2008 i too am haning problems with my n42, its on a non turbo and i just put it on and i had a vac leak but fixed it. i dont have an aac valve b/c i put a 240sx tb on it with the trigger style tps. it has a rough idle, no power and when wide open it stalls out. any suggestions? Quote Link to comment Share on other sites More sharing options...
naviathan Posted May 15, 2008 Share Posted May 15, 2008 i too am haning problems with my n42, its on a non turbo and i just put it on and i had a vac leak but fixed it. i dont have an aac valve b/c i put a 240sx tb on it with the trigger style tps. it has a rough idle, no power and when wide open it stalls out. any suggestions? What do you mean by trigger style TPS? And what ECU do you have running this? Quote Link to comment Share on other sites More sharing options...
S130Z Posted May 15, 2008 Share Posted May 15, 2008 i have seen people using 240sx tb's with the datsun style shaft and sensor box. my tb has a trigger shaped arm to move the sensor. the sensor is circular instead of box shaped. it is the stock ecu Quote Link to comment Share on other sites More sharing options...
Challenger Posted May 15, 2008 Share Posted May 15, 2008 Did you use a spacer? Quote Link to comment Share on other sites More sharing options...
S130Z Posted May 15, 2008 Share Posted May 15, 2008 yes i did use a space. Quote Link to comment Share on other sites More sharing options...
Ruiz Racing Posted August 4, 2008 Author Share Posted August 4, 2008 well my timing was off 10 degrees. and one injector was different than the others. i bought it really used. Quote Link to comment Share on other sites More sharing options...
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