Chugging at low rpm unless I punch it...
01-20-2015, 09:24 PM
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Chugging at low rpm unless I punch it... Ok so I have a 76 datsun 280z swapped with an lt1 from a 93 vette. I know it was a bad idea but I used a pressure washer on the engine like I've done a few times before.... As soon as I left the car wash it started chugging really bad at low rpm... If I step on the gas it will smooth out until the engine "catches up" then it will chug bad again. Its like its only if theres not a hard load on the engine. I know the first thing that people are going to say as soon as they see pressure washer and lt1. Opti is shot, but heres the really strange thing. I disconnected both o2 sensors and it runs just fine. If I plug the passenger side o2 in it will run fine but the driver side o2 connected makes it run like crap again... at first it was throwing a code 22 (tps) but once I dried it out and reset the ecu that one went away and stayed gone. now the only code I get is 65 with both o2 sensors connected and code 13 if I have the o2 sensor on the driver side unhooked. if its the opti, so be it. Ill put a new one on, but I'd like to make sure before I spend the cash. I've had the opti off before and I opened it up and sealed it really good with ultra black rtv before I reinstalled it. Any ideas?
:edit: I forgot one more thing. With both o2 sensors hooked up , it will run fine for about 20 seconds or so before it starts it's problems
:edit: I forgot one more thing. With both o2 sensors hooked up , it will run fine for about 20 seconds or so before it starts it's problems
01-21-2015, 01:08 PM
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Ok I'll try that first. Looks like bosch sensors in there now.. Could the car wash have messed up the o2 sensors? I swapped the map sensor with a known good one and no change . Even sprayed down the intake with carb cleaner looking for vacuum leaks and nothing. I'll try swapping out the o2s today.
Last edited by R4T5UN280; 01-21-2015 at 01:58 PM.
01-21-2015, 01:58 PM
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I just disconnected the o2 sensors and turned the key on. I tested the voltage coming out of the pcm to the sensors and the driver side is .4 volts and the passenger side is .6, Is this normal?