Hey guys, need some help here. I have no idea what the hell is going on and it's pissing me off, lol. Anyway, the car is 91' coupe w/ an S14 SR20DET swapped in. Had it for about 2-3 months now and everything has been doing very well, ran great. Suddenly my car has started to bogg down and almost die while coming off the gas and pushing the clutch in when coming to a stop. Then while im at the stop it'll idle very rough, bouncing from 400-1100rpm. It's not consistant though, sometimes it'll idle just fine and others it wont. Yesterday all of my electronics/power cut out while bogging out like described then immediately come right back on and the engine came back to normal. Also, when im making a run after 6k rpm you can feel it bog down slightly, it's very weird. Even when im at a complete stop and park while going from 1st to reverse it'll bog down and almost die. It's like someone is disconnecting my ground terminal from my battery then immediately putting it right back on it or something, odd to describe.
In attempts to solve the problem I have been monitoring my turbo timer and APEXi S-AFC to keep an eye on the battery voltage, it seems to be fine; when first started it holds at 12-12.3V then drop slightly after time. But it never goes below 11.3-11.4 so I don't think it's my battery, I have alot of electronics so im sure it's just actually using the juice. I then found my battery ground had been loose, you could literally pull it off. So I got some new terminals and replaced both the power and ground on the battery, very tight connections on both now. I'm running out of ideas here guys and have no clue what the hell is causing my problem. ANY light you can shed on the issue would be most appreciated.
S14 SR20DET Issues, help needed.
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badass240sx
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Movingviolation240
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- Car: '95 Nissan 240SX 400hp SR20DET -SOLD
'93 Lexus SC300 w/ SP66 turbo kit
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badass240sx
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Yeah I run an atmos. BOV but I wouldn't think that it would bogg down like that even when at a dead stop and just barely moving to park...not really pushing much air for the BOV to release to cause a problem I would think? Anyway, it also doesn't explain why all of the power cut out either...I mean everything went out, my clock in the dash, deck, boost controller, s-afc, super ITC, everything. Then it immediately comes right back on in enough time to keep the engine from dying.
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badass240sx
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Update: Today I adjusted the timing back to stock, adjusted the idle to bring it to an even 850rpm. I checked over the ground wire and power to the alternator, everything is fine. I checked all electrical plugs, etc. I even adjusted my BOV tension nut to tighten the piston down to make sure that wassn't the problem. After doing all of this it's still doing the same thing; bogging down to 200-300rpm maybe even lower, it almost dies. Then it comes right back up to the normal 800-900rpm. Driving is fine, nothing seems to be wrong, just when letting off the gas and coming to a stop. It's still not consistant, sometimes it will be just fine when coming to a stop but most of the time it boggs way down. Surely someone can enlighten me as to what the hell is going on. I took the day off work to fix it and haven't done that yet, so please help me, lol 
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SWIFT_DRIFT
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badass240sx
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Don't have the stock hotpipe anymore, anyway to disable to the Blitz SS BOV and re-circulate back into the intake with the BOV still in place?SWIFT_DRIFT wrote:Have you tried driving around with a stock hotpipe (no bov) see if that changes anything? Also you don't want the spring too tight on your bov or you will be causing compressor shock to your turbine.
just unplug the vacuum to the bov and it wont really open. So your not fully charging? You should be around 12.5-13.5-14 while idleing or driving Is the main fused amp under the possibly blown? Do all of your accesories work? Im just looking for something little to be wrong. It normally is. If your not getting a full charge then you will have problems like that. Do you have any backfires occasionally? Or more than occasionally? It sounds like electrical. If it was vacuum it would be more consistent down the road but electrical seems to always be inconsistent and hard to find.
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badass240sx
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All of my accessories work, nothing is dimmed or anything. My battery voltage is normal around 13.3-12.0 volts it kind of varies which I think is due to all of the electronics I have installed. I do have backfires from time to time but I imagine thats due to it running rich, haven't tuned the S-AFC yet or anything. I've been playing with the Dec. Air Flow on the SAFC trying to compensate for the BOV and it seems to have helped, but I never had these problems before, it just suddenly started to happen. I'm not sure wtf is up.MojoMan wrote:just unplug the vacuum to the bov and it wont really open. So your not fully charging? You should be around 12.5-13.5-14 while idleing or driving Is the main fused amp under the possibly blown? Do all of your accesories work? Im just looking for something little to be wrong. It normally is. If your not getting a full charge then you will have problems like that. Do you have any backfires occasionally? Or more than occasionally? It sounds like electrical. If it was vacuum it would be more consistent down the road but electrical seems to always be inconsistent and hard to find.