RUZN Posted August 23, 2009 Share Posted August 23, 2009 So, I have had this issue for awhile now and have been able to medicate it for the most part. Couple things: Swapped ECU's to the 300zxTurbo Tb swapped to 240SX I had a 300zx O2 sensor but it got fouled due to a pressure regulator issue so I put the stock 280zxTurbo O2 in for now. Issue: Morning idle rough until warm (not extreme but backfiring if you step on it) After driving down the road or first thing in morning when I go to press throttle I get hesitation, stumbling and coughs of black smoke Stop sign or lights: complete stop I got to WOT and it coughs and sputters until I hit about 2500rpm and turbo kicks in and vwoosh car goes flying. after its cruising its totally normal, tons of power. I cant remeber if my 300zxt O2 sensor cured this issue cause it only lasted a week cause FPR was at 60psi so it fouled plugs and O2 Now its fine to drive around when your moving but if you do a complete stop and then go to throttle her she hesitates 85% of the time. Plus it seems to be using to much fuel. As a Apprentice Mechanic I would say its the O2 but if I move the tps around or move ignition timing around sometimes its better or worse *TPS movement geneally makes it horrible* So..... My main guess is the 280zxt O2 is not right for the 300zxt ECU, I have my NA o2 300zx in the garage I could try that I suppose as I also have the Turbo DOwnpipe from a scrap yard. I also have the 300zx MAF as I have my 300zx Im rebuilding in garage to. so if anyone Can tell me the proper proceedure for TPS settings/MAF settings, O2 Sensor wiring (Like which pins are the 3 O2 sensor wires going to) and anything else tips ect let me know TY guys! Tired of $20 liters lasting 120km and crappy starts off the line. Quote Link to comment Share on other sites More sharing options...
woldson Posted August 23, 2009 Share Posted August 23, 2009 My 83 will do that when the engine is cold. I have the car running a bit rich, (no wideband to prove), the cold start will flood it somewhat. Used to do it often, but after tuning timeing, air bypass and afm, it was fine. (except when cold.) Quote Link to comment Share on other sites More sharing options...
RUZN Posted August 26, 2009 Author Share Posted August 26, 2009 yeah see after its warm for the most part like 90% its fine runs great tons of power. but if I sit at a light to long (its idelling awesome) but when I go to go it bogs and puffs some smoke unless I let off throttle for a half second or jam on it and let the turbo blow that crap out LOL so weird!!.. I hear now to check my ECU connections so I guess Ill tap the damn things tight so they dont move and see if that helps Quote Link to comment Share on other sites More sharing options...
Niku-Sama Posted August 28, 2009 Share Posted August 28, 2009 carbon canister? dude on a maxima message board has his go bad and cause the same thing...some how Quote Link to comment Share on other sites More sharing options...
RUZN Posted August 29, 2009 Author Share Posted August 29, 2009 I removed mine the other day and its better buuut.. Like even when I was at track today I would bog while tryign to spin tires then finally boost would kick in and spin em. soooo... not sure Quote Link to comment Share on other sites More sharing options...
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