Finally put everything back together and the car's running rich. After a few minutes it'll throw the O2 sensor code. I went to Advance and got a cheap Bosch for $20 (yay single wire OBD0). Put it in and I still get the code and I'm still running rich. Cleared it several times but it comes back. Are Bosch sensors no good? Or should I start to look elsewhere? Plugs and wires are new, so is cap and rotor. I'm using an MSD coil, so I need to check that and see if it's bad. Any other ideas?

 

for some weird reason, ive heard negative comments about bosch o2 sensors. oem i guess is the best way to go, expensive as shyt. what code are you getting, i ask because if its 420, itll be the cat.

 

I don't think OBD0 codes go that high . Anyway, it's code 1

 

Bump for opinions

 

check all 02 wiring mine was running so richit bogged ended up being the 02 was grounding out fixed that and havent had a problem

 

What car is this for? 94+ Integras use 4-wire O2 sensors. I installed a 4-wire Denso sensor in mine with the OEM harness plug already on it. It was about $95 I think. NGK's go for a bit less, but I would definitely stick with either NGK or Denso.

 

I would go for NTKs (which are made by NGKs) because thats what comes with our tegs from the factory. And I would also check that MSD coil, any kind of aftermarket distributor parts are known to fail prematurely compared to OEM parts, especially MSD. I forget where I read it from (most likely from TI), but people who use MSD distributors, etc. most of the time get problems with their wires arcing after just a couple thousand miles. I would just stick to OEM spec parts if you're just mildly modded.

 

I've already said it was OBD0 in the thread twice. I think I'm gonna exchange this for another Bosch and if that doesn't work maybe try and NTK or Denso

 

try another o2 sensor. but also check or swap out the coolant temperature sensor. if the coolant temp sensor is stuck reading cold it will cause the engine to run rich all the time.

 

There's just one sensor, right? And if the gauge in the car reads normal than the sensor's good? Because the gauge starts cold and goes to the middle after a few miles like normal

 

Yes there's only one primary sensor for obd0 and 1. The secondaries came with the obd2 cars