sqd
03-02-2011, 12:46 AM
Neccessary info that you may need to know:
SR20 blacktop
850cc SARD injectors
Walbro fuel pump
PowerFC
Z32 MAF
+ a whole lot more, but I don't think any of it can cause this.
To make a long, long story a bit shorter:
Emissions read fine in May last year, then I recirculated the SSQV (because the car sometimes stalled when putting the clutch down when in higher rpms), then my exhaust manifold cracks, I think it's the manifold that causes my bad/high emissions, but I later find out it isn't. I remove the recirculation and get a custom built exhaust manifold & downpipe, emissions are OK for like a day or two. Then, the idle starts going bad, but just SOMETIMES. But even if the idle is ok, the emissions are still bad/too high.
I've replaced sparkplugs, O2 sensor, water temp sender, moved the MAF further away from the turbo (this made the car way more easy to drive in low rpm) and made sure that the exhaust has no leaks.
Now I've checked the fuel pressure and with a stock SR, it should be around 36 PSI, right? Well when I checked yesterday, my pressure was at 29 PSI.. So adjusted it to just over 36, and it started idling like this:
Video - TinyPic - Free Image Hosting, Photo Sharing & Video Hosting (http://tinypic.com/player.php?v=5139fo&s=7)
Also, do you hear that strange, kind of squeaking sound? What is that? You can only hear it when it's idling rough like it does in the video. It comes from the head/intake somewhere, but it's kinda hard to locate.
And I THINK the reason why the bad idling has come and gone, is because when I was checking the fuel pressure, i noticed that the nut on top of the FPR was loose, so it could've adjusted itself, since the nut is supposed to prevent that..
Also, the car runs fine on boost/WOT.. But it feels a little sluggish, maybe due to the fact that the car is running rich, which is proven by the emissions test, they're all too high.
SR20 blacktop
850cc SARD injectors
Walbro fuel pump
PowerFC
Z32 MAF
+ a whole lot more, but I don't think any of it can cause this.
To make a long, long story a bit shorter:
Emissions read fine in May last year, then I recirculated the SSQV (because the car sometimes stalled when putting the clutch down when in higher rpms), then my exhaust manifold cracks, I think it's the manifold that causes my bad/high emissions, but I later find out it isn't. I remove the recirculation and get a custom built exhaust manifold & downpipe, emissions are OK for like a day or two. Then, the idle starts going bad, but just SOMETIMES. But even if the idle is ok, the emissions are still bad/too high.
I've replaced sparkplugs, O2 sensor, water temp sender, moved the MAF further away from the turbo (this made the car way more easy to drive in low rpm) and made sure that the exhaust has no leaks.
Now I've checked the fuel pressure and with a stock SR, it should be around 36 PSI, right? Well when I checked yesterday, my pressure was at 29 PSI.. So adjusted it to just over 36, and it started idling like this:
Video - TinyPic - Free Image Hosting, Photo Sharing & Video Hosting (http://tinypic.com/player.php?v=5139fo&s=7)
Also, do you hear that strange, kind of squeaking sound? What is that? You can only hear it when it's idling rough like it does in the video. It comes from the head/intake somewhere, but it's kinda hard to locate.
And I THINK the reason why the bad idling has come and gone, is because when I was checking the fuel pressure, i noticed that the nut on top of the FPR was loose, so it could've adjusted itself, since the nut is supposed to prevent that..
Also, the car runs fine on boost/WOT.. But it feels a little sluggish, maybe due to the fact that the car is running rich, which is proven by the emissions test, they're all too high.