SR20 - Problems after switching back to stock intake - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

akruger34 · 06-18-2018, 06:56 PM

To preface this post: 1993 hatch w/ blacktop s13 sr20det type 62 ecu, 255 pump, new 370cc injectors and seals, turbo elbow, hks bov, fmic, new z32 fuel filter.

So I was having issues where the car would idle very rich (mid 11's) and wouldnt seem to get low enough under WOT until further up in the rpms. I performed a boost leak test and could hear hissing around the intake manifold, so I decided it was time to swap from the greddy rep my swap came with back to a stock manifold. I picked up a manifold with the throttle body and IACV installed and installed it. Now I am still having a somewhat rich idle (mid 13's, but dives to 11's sometimes) and fluctuation after setting the tps. (set to .45 V closed) When I turn it on it idles at a normal rpm, but after a couple minutes it jumps up to 1500, then seems to waver between 1k and 1500. Another oddity that is occuring now but not before is when I press the brake and release, the afrs jump 2-3 points all the way up to 16's. I performed the generic tests I found online to test booster diaphragm leaks (holding brake and starting the car, and holding brake and turning off engine) and it seemed to pass. I ordered a new fpr to ensure that I am not over fueling due to a worn out fpr, but that doesnt seem to explain the wandering idle and brake effect. Engine pulls -22 vacuum at idle and is not affected by the brakes. I have tried spraying starter fluid around any joints and fittings with no effect. For reference, the pcv on the passenger side of the valve cover is blocked and the line on the manifold is plugged, on the drivers side there is a line running to the case and a vent to atmosphere. Any directions are appreciated!

06-18-2018, 06:56 PM	#1
akruger34 Join Date: Oct 2017 Location: Buffalo, NY Posts: 22 Trader Rating: (1) Feedback Score: 1 reviews	SR20 - Problems after switching back to stock intake To preface this post: 1993 hatch w/ blacktop s13 sr20det type 62 ecu, 255 pump, new 370cc injectors and seals, turbo elbow, hks bov, fmic, new z32 fuel filter. So I was having issues where the car would idle very rich (mid 11's) and wouldnt seem to get low enough under WOT until further up in the rpms. I performed a boost leak test and could hear hissing around the intake manifold, so I decided it was time to swap from the greddy rep my swap came with back to a stock manifold. I picked up a manifold with the throttle body and IACV installed and installed it. Now I am still having a somewhat rich idle (mid 13's, but dives to 11's sometimes) and fluctuation after setting the tps. (set to .45 V closed) When I turn it on it idles at a normal rpm, but after a couple minutes it jumps up to 1500, then seems to waver between 1k and 1500. Another oddity that is occuring now but not before is when I press the brake and release, the afrs jump 2-3 points all the way up to 16's. I performed the generic tests I found online to test booster diaphragm leaks (holding brake and starting the car, and holding brake and turning off engine) and it seemed to pass. I ordered a new fpr to ensure that I am not over fueling due to a worn out fpr, but that doesnt seem to explain the wandering idle and brake effect. Engine pulls -22 vacuum at idle and is not affected by the brakes. I have tried spraying starter fluid around any joints and fittings with no effect. For reference, the pcv on the passenger side of the valve cover is blocked and the line on the manifold is plugged, on the drivers side there is a line running to the case and a vent to atmosphere. Any directions are appreciated!