ukcats07 Posted October 1, 2015 Share Posted October 1, 2015 I swapped a 2002 5.3L into my 73 Datsun 240z and re-worked the original suburban harness using lt1swap.com. When I started it up I had a really rich condition and today I finally had the chance to wire the OBDII and run the codes and I only had the P0102. I checked all my wires to the MAF and found that my five wire sensor has a yellow, pink, black, tan and black white wire. My yellow wire had good continuity at the PCM, the pink wire had 12v, the tan wire had 5v and the black wire had a good ground. My black/white wire did not match lt1swap.com 2002 PCM pinout and did not have continuity at the PCM. I must have over-looked it during the re-work. It's only a ground wire for the IAT, so I cut it and ran it straight to a good ground. I had an issue before finding this bad ground where when I had the O2 sensors connected, the car would run extremely rich and barely idle. If I had the O2 sensors disconnected it would still run rich, but at least it wouldn't bog down or attempt to die. Now that I fixed the ground wire, I was able to start it up with the O2 sensors connected and it ran great (idle only) with no hints of running rich. Side note: I checked the headers with an IR gun and my passenger side is reading around 450-500 and my driver's side is more like 250-300. Any advice on where I should start with regards to this? Doug Quote Link to comment Share on other sites More sharing options...
randy 77zt Posted October 1, 2015 Share Posted October 1, 2015 I just finished an ls6 harness from a vette.The lt1swap.com had some of what I needed but I ended up going on www.alldata.com and getting the oem diagrams .The website lets you see or print the pages that you need.All wire colors/pin positions were %100 accurate.Cost is $24/year.Have you tried another maf?Or cleaned the maf?Sometimes if you put too much oil on a k&n filter you will get codes.I dont ground any sensor wires-there is usually a sensor ground return wire on the ecm.I never depend on a body/chassis/engine ground connection. Quote Link to comment Share on other sites More sharing options...
crapforum Posted October 2, 2015 Share Posted October 2, 2015 You swap anything on this motor or is it all bone stock 5.3 stuff? How are you tuning it, hptuners or something? Could be a bad MAF, truck wiring harness in good shape? You get rid of VATS? Quote Link to comment Share on other sites More sharing options...
ukcats07 Posted October 5, 2015 Author Share Posted October 5, 2015 You swap anything on this motor or is it all bone stock 5.3 stuff? How are you tuning it, hptuners or something? Could be a bad MAF, truck wiring harness in good shape? You get rid of VATS? Stock LS1 intake and injectors--bone stock otherwise. Brendan at lt1swap flashed the PCM with the appropriate changes. I don't have the ability to tune it and haven't been able to get it to a tuner. After grounding the wire for the IAT, the code went away and the motor is running much better. The truck harness was in great shape, I think I just missed that the white/black wire needed to be grounded. The only issue I'm having now is fuel starvation. My pre-filter to the walbro is too restrictive. I drove the car around the block and halfway around I threw both knock codes and the fuel pump was whining like my two year old. I can make the pump stop whining if I tap the 90 degree filter while it's whining. I'm going to put a less restrictive filter before the pump and see if it fixes the problem. Quote Link to comment Share on other sites More sharing options...
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