cel code 1 trouble shoot

[HEADSHOT]

So my car has hunting idle when cold. Rough throttle when cruising at freeway speeds. And throw a cel code 1 when I beat on it for a few gears. Any ideas?

[lsvtec-crx]

What year car.? Code 1 is o2 sensor.

[HEADSHOT]

its a 93 cx with a ls engine. its a obd2 head with a obd1 i/m. i know the code 1 is 02 sensor. but i have found very little online as to what usually causes this

[Rzarectah]

Well a code 1 isn't going to do anything with a hunting idle when cold, the O2 sensor is null until the you are in closed loop. For that issue I would start with checking my IAT sensor, ECT sensor, and IACV. As for the rough throttle at cruising speeds/loads that could very well be your O2 sensor.

[HEADSHOT]

ect?

[Rzarectah]

Engine coolant temp. I've never seen one fail but I've seen stranger things happen.

[HEADSHOT]

heres a question. im running the stock civic exhaust which im pretty sure is leaking at the flange being they are nowhere near the right size. think i could be getting messed up o2 readings because of this??

[Rzarectah]

Depends how close it is to the sensor. The pulsing of the engine allows for oxygen to get in the leak, causing a false lean reading. Your engine may be running too rich because of this. in extreme cases this can cause a "wash out" of your cylinders, which means there is enough fuel in the cylinders that it actually removes the oil off the walls and causes blow by.