5.3 ls random codes after possible overheating
Thread Starter
Staging Lane
Joined: Apr 2022
Posts: 81
Likes: 5
5.3 ls random codes after possible overheating So I have a 1979 firebird swap and the other day I took out my car for it’s first drive and I believe it wouldn’t over heat but I think I was wrong. I believe my engine may have overheated and now I have several codes. I was driving and it just started sputtering and died
I have
po300
po327
po332
po154
+
po650 (this is just an engine light I think and I have to hook it up eventually, I had this before test drive)
any suggestions on what do do?
I have
po300
po327
po332
po154
+
po650 (this is just an engine light I think and I have to hook it up eventually, I had this before test drive)
any suggestions on what do do?
TECH Fanatic
Joined: Dec 2017
Posts: 1,467
Likes: 265
From: Bossier City, Louisiana
Feel the various pieces of wire insulation with your hands to see if it got melted. Do the codes clear if you clear them or do they return?
Use an infrared temperature gun to see if it REALLY IS hot in the engine around the temperature sending unit - whichever port on the head you have chosen. On my LS engine, my temperature actually is hotter at the passenger side rear head port than the driver's side front port by usually 15-20 degrees - as seen on my PCM parameter stream data and my Dakota Digital temperature gauge -- and crosschecked with an infrared thermometer.
Run a PCM parameter stream on your OBD2 data and see if your O2 sensors are responding and if your Long and Short Term Fuel Trim data looks reasonable. Reasonable for me is plus or minus 10%.
Rick
Use an infrared temperature gun to see if it REALLY IS hot in the engine around the temperature sending unit - whichever port on the head you have chosen. On my LS engine, my temperature actually is hotter at the passenger side rear head port than the driver's side front port by usually 15-20 degrees - as seen on my PCM parameter stream data and my Dakota Digital temperature gauge -- and crosschecked with an infrared thermometer.
Run a PCM parameter stream on your OBD2 data and see if your O2 sensors are responding and if your Long and Short Term Fuel Trim data looks reasonable. Reasonable for me is plus or minus 10%.
Rick
Thread Starter
Staging Lane
Joined: Apr 2022
Posts: 81
Likes: 5
None of my wires look nor feel as if they’ve been burned. The only ones I can’t see are my knock sensors. I also don’t have anything to look at obd 2 parameters, I will try deleting the codes to see if they go away tomorrow when I have more time.
Thread Starter
Staging Lane
Joined: Apr 2022
Posts: 81
Likes: 5
Ok so I replaced my knock sensors and everything seems fine right now. All my codes went away and I think what was happening was my knock sensors got over torqued or maybe they were just cheapos from Amazon but they were causing timing to be messed up so it cause the po300 (random misfire) which then led to my o2 sensors throwing a code.
will update in a couple of days to see if anything changed, if I forget then that means everything is good
thank you!!!
will update in a couple of days to see if anything changed, if I forget then that means everything is good
thank you!!!
