P0102 5.3 swap solution
Thread Starter
Teching In
Joined: Oct 2014
Posts: 6
Likes: 1
From: Wichita Falls, TX
P0102 5.3 swap solution 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
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
Thread Starter
Teching In
Joined: Oct 2014
Posts: 6
Likes: 1
From: Wichita Falls, TX
This makes sense with how it was running. The black/white wire is a ground for the IAT and once I grounded it, the car started running like it should.
