SR problems, need help - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

twinspool · 02-14-2010, 12:01 AM

Well the problem started right after I had finished installing my new downpipe on my car and started it up. I had found holes in the intercooler piping that I got welded, but sealed them all up and pressurized it again and its all sealed up. But when I start the car up its all fine and perfect vacuum but once it warms up to 59 degrees celcius it starts to bogg up and down constantly and the vacuum goes from -19.5 psi down to -14psi on my boost gauge and holds right there. When I rev it up and let off the gas, the idle goes all the way down and back up and back down and finally dying. It is running super rich as well 9.0-9.1 afr. I don't think I have a boost leak anywhere because I pressurized just about everything but going to double check later today.
Has anyone had this problem before? What could be the problem?
thanks

twinspool · 02-14-2010, 12:26 AM

I forgot to add that the car ran just fine before I installed the down pipe

twinspool · 02-14-2010, 11:11 AM

well I got it to stop bogging up and down when it warms up but now its running really rich and whenever I tap the gas at all, it starts to idle up and down up and down and eventually dies, I tried turning the injectors down and that helped a little but the afr's are going up and down and not staying steady at idle from 11 up to 15 and 16 and back down and sometimes it would stay steady but go back to it after a little while

gigity · 02-14-2010, 12:26 PM

Quote:

Originally Posted by twinspool

well I got it to stop bogging up and down when it warms up but now its running really rich and whenever I tap the gas at all, it starts to idle up and down up and down and eventually dies, I tried turning the injectors down and that helped a little but the afr's are going up and down and not staying steady at idle from 11 up to 15 and 16 and back down and sometimes it would stay steady but go back to it after a little while

When you stay on the gas does it act shitty or just at idle? Any tuning stuff (safc, e manage)

fcdrifter20 · 02-14-2010, 05:22 PM

wut kinda bov are u running?? and u sure all ur vaccumes are connect, u didnt accedentaly knock one loose

twinspool · 02-14-2010, 09:51 PM

a greddy rs one, and yes all vacuums are finally fixed, I found like five in all and the psi stays at -19.5 now. I tried tightening the bolt but it still did the same thing and the afr still keeps fluctuating. I am going to check the o2 sensor tomorrow morning to see if that might have crapped out on me because it did rain a good bit here and my hood is raise and that plug is right there where its open. I really want to recirculate the bov though that way I wont have problems like that.

twinspool · 02-14-2010, 09:57 PM

Quote:

Originally Posted by gigity

When you stay on the gas does it act shitty or just at idle? Any tuning stuff (safc, e manage)

it did do that before I fixed all the vacuum leaks, like I kept it stationar by the throttle and it would sound like its going up down up down. It still there a little but I think its only like that because its running so rich.
I have the apexi pfc

twinspool · 02-15-2010, 10:06 PM

I had fixed the problem and it turned out to be a really easy fix. I had the maf sensor too close to the turbo inlet and when I moved it further, it fixed the problem instantly. I need to move it a little bit further away. I didn't know the location of the maf had mattered that much.
thanks for the help.

02-14-2010, 12:01 AM	#1
twinspool Zilvia Junkie Join Date: May 2006 Location: mississippi Posts: 349 Trader Rating: (7) Feedback Score: 7 reviews	SR problems, need help Well the problem started right after I had finished installing my new downpipe on my car and started it up. I had found holes in the intercooler piping that I got welded, but sealed them all up and pressurized it again and its all sealed up. But when I start the car up its all fine and perfect vacuum but once it warms up to 59 degrees celcius it starts to bogg up and down constantly and the vacuum goes from -19.5 psi down to -14psi on my boost gauge and holds right there. When I rev it up and let off the gas, the idle goes all the way down and back up and back down and finally dying. It is running super rich as well 9.0-9.1 afr. I don't think I have a boost leak anywhere because I pressurized just about everything but going to double check later today. Has anyone had this problem before? What could be the problem? thanks

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

02-14-2010, 12:26 AM	#2
twinspool Zilvia Junkie Join Date: May 2006 Location: mississippi Posts: 349 Trader Rating: (7) Feedback Score: 7 reviews	I forgot to add that the car ran just fine before I installed the down pipe

02-14-2010, 11:11 AM	#3
twinspool Zilvia Junkie Join Date: May 2006 Location: mississippi Posts: 349 Trader Rating: (7) Feedback Score: 7 reviews	well I got it to stop bogging up and down when it warms up but now its running really rich and whenever I tap the gas at all, it starts to idle up and down up and down and eventually dies, I tried turning the injectors down and that helped a little but the afr's are going up and down and not staying steady at idle from 11 up to 15 and 16 and back down and sometimes it would stay steady but go back to it after a little while

02-14-2010, 05:22 PM	#5
fcdrifter20 Post Whore! Join Date: Nov 2007 Location: riverside, ca Age: 37 Posts: 2,869 Trader Rating: (44) Feedback Score: 44 reviews	wut kinda bov are u running?? and u sure all ur vaccumes are connect, u didnt accedentaly knock one loose

02-14-2010, 09:51 PM	#6
twinspool Zilvia Junkie Join Date: May 2006 Location: mississippi Posts: 349 Trader Rating: (7) Feedback Score: 7 reviews	a greddy rs one, and yes all vacuums are finally fixed, I found like five in all and the psi stays at -19.5 now. I tried tightening the bolt but it still did the same thing and the afr still keeps fluctuating. I am going to check the o2 sensor tomorrow morning to see if that might have crapped out on me because it did rain a good bit here and my hood is raise and that plug is right there where its open. I really want to recirculate the bov though that way I wont have problems like that.

02-15-2010, 10:06 PM	#8
twinspool Zilvia Junkie Join Date: May 2006 Location: mississippi Posts: 349 Trader Rating: (7) Feedback Score: 7 reviews	I had fixed the problem and it turned out to be a really easy fix. I had the maf sensor too close to the turbo inlet and when I moved it further, it fixed the problem instantly. I need to move it a little bit further away. I didn't know the location of the maf had mattered that much. thanks for the help.