Fmcmaste
09-14-2014, 11:51 PM
Hi, I just signed up because I need help diagnosing my sr20 because it has me stumped.
Okay, to start here are the details. I have a 1995 s14 ob1 that i just got done swapping a blacktop s13 sr20det into. I bought the motor from a friend that knew nothing about it. Once I pulled it apart to rebuild it I could see the rotating assembly had been balanced but seemed to be stock internals otherwise. The valve springs and cams are possibly aftermarket as well, but was unable to find any kind of marks discerning make/lobe or anything helpful so I guess we can assume stock for the time being. There's an aftermarket bottom mount exhaust manifold bolted to a garrett GT2871R thats hooked up to a full 3" Apexi N1 exhaust. I have a godspeed front mount intercooler with a TIAL bov set on the cold side of the tubing. Plenum is stock with what seems to be a stock sr throttle body, the injectors are a light purple so again I'm assuming they're the stock 370cc's along with a z32 maf. finally I have it wired in with a wiring specialties harness connected to a stock sr ecu as well as running a walbro 255. I also have and Apexi power fc that is not hooked up yet but but was acting the exact same way when I tried hooking it up
Now for the issue. When I go to start the car it sounds like its really fighting itself. It wont turn on smoothly you have to gas it to keep it running while hearing back firing, stuttering, sputtering only clearing up at around 1500 to 2000+ rpm. At which point after struggling to start and keep it running it will calm down and set into a smooth idle around 8-900rpm with around 15-20psi vacuum. Sometimes it will hold until messed with other times it will slowly tapper off and die unless you persist in gassing it. Now I set timing to a T from what I have read from the manual I have. I have checked all the grounds, I'm getting fuel air spark I'm just stumped at the moment and any insight or help would be hugely appreciated thanks for your time and sorry about the drawn out post if there's any pertinent info that I left out please let me know and I'll tell you what I know.
Okay, to start here are the details. I have a 1995 s14 ob1 that i just got done swapping a blacktop s13 sr20det into. I bought the motor from a friend that knew nothing about it. Once I pulled it apart to rebuild it I could see the rotating assembly had been balanced but seemed to be stock internals otherwise. The valve springs and cams are possibly aftermarket as well, but was unable to find any kind of marks discerning make/lobe or anything helpful so I guess we can assume stock for the time being. There's an aftermarket bottom mount exhaust manifold bolted to a garrett GT2871R thats hooked up to a full 3" Apexi N1 exhaust. I have a godspeed front mount intercooler with a TIAL bov set on the cold side of the tubing. Plenum is stock with what seems to be a stock sr throttle body, the injectors are a light purple so again I'm assuming they're the stock 370cc's along with a z32 maf. finally I have it wired in with a wiring specialties harness connected to a stock sr ecu as well as running a walbro 255. I also have and Apexi power fc that is not hooked up yet but but was acting the exact same way when I tried hooking it up
Now for the issue. When I go to start the car it sounds like its really fighting itself. It wont turn on smoothly you have to gas it to keep it running while hearing back firing, stuttering, sputtering only clearing up at around 1500 to 2000+ rpm. At which point after struggling to start and keep it running it will calm down and set into a smooth idle around 8-900rpm with around 15-20psi vacuum. Sometimes it will hold until messed with other times it will slowly tapper off and die unless you persist in gassing it. Now I set timing to a T from what I have read from the manual I have. I have checked all the grounds, I'm getting fuel air spark I'm just stumped at the moment and any insight or help would be hugely appreciated thanks for your time and sorry about the drawn out post if there's any pertinent info that I left out please let me know and I'll tell you what I know.