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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars |
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10-19-2016, 09:45 AM | #1 |
Leaky Injector
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Odd Stuttering S13 Blacktop
Quick: Car will run fine for around 30 min and then all of a sudden starts misfiring/stalling at idle and when pushing the car. Here's the issues i pretty much notice . .
Quick note.... Vacuum at idle = -18 to -20 (depending on what the idle is at) Boost holds all the way to redline when car isn't misfireing ---------------------------------- Info: 94 Blacktop Nistune Daughterboard 740 Nismo injectors Z32 MAF Nismo FPR Walbro 255 GT2871 64 AR HKS Wastegate actuator Apex-i ACV-R WideBand gauge and sensor NGK BKR7E @ .032 NEW coil packs ---------------------------------- Issue: Car starts up fine Drive around for 30 minutes and get to operating temp Car will begin to start reading lean on the Wideband Car will begin to misfire/stall and read VERY LEAN (15 -17:1) As car stalls I have to give it WOT to keep it running and during this time, it sounds like cylinders are misfiring (almost like a WRX engine) Once car completely stalls, I am unable to start car again (must wait like an hour before starting it again. Even then, it barely runs and is misfiring like crazy) What I've done: Coil Packs: Replaced Spark Plugs: Replaced (even gapped smaller to .028) Walbro 255: Replaced Fuel Filters: Replaced Z32 MAF: Cleaned and checked connections Coolant Temp Sensor: Replaced and checked resistance. all within spec. What I've checked: Z32MAF - Possibly Dead? - Igniton on Voltage: 0.42 - Idle Voltage: 1.1 - 1.2 - My Link for instructions TPS- Seems OK - Closed: 0.52 - WOT: 4.2 - ECU correctly shows 'throttle closed' flag when throttle closed - FSM states 0.4 CLOSED - ~4.0 WOT FPR- Could be bad - Found instructions for testing FPR without a gauge. Thoughts? Fuel Pump - Fuel pump is working and has full 12V (direct line to battery with inline fuse) Ignitor Chip: I do not know how to test this. I looked it up and the directions didn't match with my chip. My chip shows "22020-50F00" for part number. On one side it shows E1,E2,E3,E4 and on the other side it shows (I1,I2,G,I3,I4). FPR: I thought this could be it, and will be purchasing a fuel pressure gauge soon to run inline before the fuel rail to see if I'm losing pressure for some reason. So... Ignitor Chip: It could be that the ignitor chip is getting to hot (operating temp) and failing at that point. This would explain why I can drive it in the morning without problems, but after about 30 minutes it starts having the misfires and stutters and then just dies. MAF: The readings seem low for the MAF. I could also see this being the problem as more air is getting through than the MAF is reading which is causing the lean condition I see on my wideband. Fuel Pressure: Clogs in the fuel filters/flow could be causing the starvation and thus misfires and stumbling. I already replaced all filters and pumps, but the problem still stands. Any help at this point is greatly appreciated, as I've basically gone as far as I can think of. I have Nissan Data Scan I and used it for logging the ECU while driving to capture if any sensors were going crazy. This looks to be unhelpful at this point. I have the logs if anyone would like to look at them. Last edited by GLoBaLReBeL420; 10-20-2016 at 04:55 PM.. |
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issue, maf, misfire, sr20det, stall |
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