so the other day when i'm driving i get CEL on, started bogging a little on the freeway. i go under the carpet and check the ECU window and i get steady constant flashes just repeating 1 blink. i searched and found the code to be the #1 O2 sensor but when i look under the car at my header there is no O2 sensor? wtf? my car used to run fine since i've had it until just recently the CEL. it goes away after i shut the car off and go back to drive it within a little while. i have a aftermarket header and right before the cat where an O2 sensor should be is just a bolt. any ideas?

 

Are you using the oem cat?

If you are is there 1 or 2 o2 sensors installed? I believe your car is obd0 so you should only have one o2 sensor in the cat if im not mistaken.

The #1 o2 sensor should be instaled in the hole on your aftermarket header. If your running a oem cat, the bolt thats on the header should be threaded on the first hole in the cat to block it.

If your cat has two o2 sensors, then you might have either the wrong year header on the motor which should not have the o2 bung on the header and or your using a obd2 cat on a obd0 motor which looks for only one o2 sensor.

So your car is obd0 cause its a 1990'' if it is than your cat should only have one o2 bung which should be plugged and the o2 sensor should be on the header.

 

i will look again this week as i am gonna do the oil pan gasket and front main crank seal. it's a b20 96' i believe so not sure if it's obd1 or obd2. it has the stock ecu also i believe where the LED shines thru the little window. sorry not giving much information i know little when it comes to this.

 

I am having this same exact problem..its been like a year..I can only drive the car for a short while before it throws code 1 and boggs me to death and won't let me accelerate or rev..

Let it sit for a minute(5-10min) and then starts up and drives fine for a short while again..

 

@JuicedUpRice does your car have an O2 sensor? mine doesn't and that makes me wonder why it's throwing the 1 code when it ran fine without it up until now. this sux this car been giving me a lot of problems lately.

 

I don't have an o2 sensor on mine either.in fact,I don't even know where the wires are for it lol..

for me,the code comes up randomly,but i can make It come on right away if I downshift to slow down..

 

i had a 90 da and i did a full exhaust and it had no hole for the o2 so i just left it alone and didnt bother. i had a code but the car ran fine. now i have a db1 and i just did a full exhaust and like you said deeboi i had a hole for an o2 right befor the cat. what i did was i took the o2 sen cut the pigtail off and connected the pigtail to the wire harness were it belongs then i took 4 feet of, i wana say 18 gauge wire. and ran it to the hole were the o2 sen goes i then used a connector and connected both ends and then boom you have an extended o2 sen, no code no problem.

 

O2 sensor should be in the front of the cat. Not easy to see unless the car is raised. You couldn't drive a foot with a disconnected O2 sensor without the CEL coming on so you guys must be missing something.

 

not true my DA had no o2 connected and i would drive 30 min after start up befor it would come on.

 

I spaced and forgot these were DAs

 

Primary oxygen sensors are corrections to the fuel outputs from the base map. Running off of the base map (and other corrections sans oxygen sensor) is enough for the engine to run well enough for you to not notice here's something wrong.

The only negative effect should be a change in gas mileage...usually for the worse.

This scenario is not the same as a bad oxygen sensor where it could feed the ecu bad inputs that could noticeably affect drivability.

 

that made me lol


it is prob something else the o2 wouldnt make your car bog like that. atleast it never did for me and i had a stang that needed 4 o2's and i didnt have one hooked up and even that ran fine. my DA ran fine. but do like i said so you dont have the code. make an extended o2 and you wont have the code anymore.

 

Lol too funny.

My situation has been leading to a fuel issue,but it could be unrelated..I've had a drop in fuel pressure at my rail,and it drops almost 10psi upon acceleration..when its at the bogging state,my rail shows 0psi but will run in idle..when I press the gas it will just bogg out..

The bogging typically happens when that o2 sensor code gets thrown..

 

I know it's bad but I keep forgetting that DA's exist DA's I love you but I just forget about you.

 

like juiced, i don't even know if the wires are there for the O2. i gotta check when i have the car up. also i gotta check the fuel pressure as well to see if that leads to a problem.

i searched google and found that for my year, the code means "oxygen content" which tells me it could be something else. i read that vacuum leaks could cause this and even one post the car's intake cam was a tooth off on the timing.

i'm also having idle problems so whatever is throwing that code my be affecting that too. 1990 DA i might just run it like this and see if i can find out what's wrong with the idle. i would do what you said and extend the wiring to the O2 but i'm not even sure if i know where the wires for it are.

if all else i might take it to a shop near me that does hondas to see if they can at least diagnose my idle problem. like i said got so many problems with this car now but that's what DA's a known for since there so old, at least mine. taking it to the shop would be my last resort, i hate someone else having to fix my car for me but i also don't want to be throwing money at it if it's not gonna fix it. i'd like to do most the repairs myself.

 

Describe the idle problem. Are the roaming revs meaning do they bounce up and down at a semi slow pace or are they very quickly bouncing? Could very well be a leak


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the idle is rough. sometimes the car will die when i'm driving it when switching gears if the idle drops all the way down and i don't give it gas. the roaming revs are pretty much slow. when the car is warming up the idle seems fine, it's just that after it's warm the idle fluctuates. the car will die sometimes if i don't bounce the throttle like at a red light or stop sign..

also to confirm that my car has no O2 sensor. just a bolt where the hole in the header is. my whole exhaust was down today when i changed the oil pan gasket and i saw no O2 and also there may have been wires because i seen near where the O2 sensor should be it was cut, but it was not wires more like a hollow tubing kinda like thin vacuum line.

 

Okay so it sounds like you have a bad vac leak. I would double check all vac lines see if there are any cracks and also see if there even routed the right way. Somewere on the forum there is a diagram of were everything goes and hooks up to what. As for the o2 sensor it plugs Into a outlet that is basicly directly to the left of the plat on the block that says b18a1 the plug is usually attached to the tranny. Thats were the o2 sensors pigtail goes. Take the bolt out of the exhaust and hook it up.


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I just went ahead and picked up an o2 sensor.anyone have a link to said diagram?or a picture of where the o2 sensor starts?I'm gonna have to rewire the whole thing because I'm pretty sure the previous owner attempted to delete it.

Is there a way to bypass or actually disable it,without tuning or reprogramming?
Can vacuum be effected by having an open header?

 

@1990-da not sure if those diagrams will help, at least for the smog hardware. i think the previous owner took out things like the egr valve and other related parts. also my motor is a b20. the head says 96' and i believe it's the p75 head. also i test drove it today after changing out my front crank seal and the light didn't come on, but the car died once or twice, the rpm's just fell till the engine shut off. do you think it could be related to the IACV? should i clean it?

 

The 90-91 Integra's 02 sensor isn't under the car it's right behind the radiator. It's also a 1 wire 02 not a 4 wire

 

so will installing an O2 sensor make my car run better? or will it make a noticeable difference? my car get's pretty good gas mileage.

 

that makes sense. i seen some extra plugs by the radiator wasn't sure if it was for the a/c fan.