wbooker13 Posted March 26, 2019 Share Posted March 26, 2019 Ok I have a notch top kouki Sr20det swapped into my 72 240z. The motor started and ran great on the first test, but something changed and now it won’t idle at all. It bogs down and dies immediately. Whenever I unplug the maf it’ll idle..... runs like shit, but it’ll at least idle. Brand new o2 sensor, brand new coolant temp and knock sensor. I have a wiring specialties harness installed to it, a z32 MAF, an intercooler and piping kit, how bov, and everything else is pretty much stock. I deleted the IACV system thinking it might solve it but to no success. I’m running a Fuel Pressure regulator and that didn’t help either. It’s got a way to 255 pump. Quote Link to comment Share on other sites More sharing options...
wbooker13 Posted March 26, 2019 Author Share Posted March 26, 2019 As soon as I plug the sensor back in the car dies. It’s running extremely rich. You can smell it it blows out black smoke when you give it gas Quote Link to comment Share on other sites More sharing options...
ZHoob2004 Posted March 26, 2019 Share Posted March 26, 2019 (edited) You say you have an aftermarket fuel pressure regulator, are you sure it's set to the stock fuel pressure that the ECU expects? Have you put a gauge on your fuel rail to measure this? Is it plumbed correctly? Is your return line large enough for your upgraded pump? Have your injectors been changed? If it's running rich, you have too much fuel (you know this already), so you're either getting more fuel than expected or not enough air. I don't think an 02 sensor will change the fueling enough to make the engine die, same with coolant sensor. The rest seems to be largely irrelevant to the issue as well, with the exception of the Z32 MAF. I don't know if they're the same as stock or not. Is it possible to switch the MAF back? Could you test with a different MAF? Edited March 26, 2019 by ZHoob2004 Quote Link to comment Share on other sites More sharing options...
jhm Posted March 27, 2019 Share Posted March 27, 2019 https://forums.hybridz.org/forum/37-nissan-4-cyl-forum/ Quote Link to comment Share on other sites More sharing options...
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