93 DET

Vehicle Info: 1991 CRX w/ B16a PR3 ecu

Codes: 14 IACV EDIT: NO CODES ANYMORE.

This mostly happens on the freeway, but has happened at lower speeds. After driving 12 minutes on the freeway, my car will begin to lose power and the exhaust note changes. It lasts for about a minute, then goes away. Then cycle repeats.

If pedal is depressed more then 3/4 of the way when it's bogging, it will "jump out" of it's bogging issue and accelerate normally. It's really consistent on when it happens. Spark plugs, plug wires, distributor, knock sensor, and o2 sensors have just been replaced.

So what's going on?

https://honda-tech.com/forums/showth...6#post46854486
^ Link to reason why I have a check engine light.

crvtectim

Clogging cat? Pull an O2 sensor out and then drive it and see if it runs better.

Stunna MIKE

Sameyhing was happening to me, almost to exactly. And it was dizzy

93 DET

Thanks for the responses.

I don't see how a clogged cat would cause it to bogg. But it makes sense in the fact that it takes a while for the cat to heat up, which is around the time the car bogs. I'll check it out.

Removing any of the o2 sensors makes it run really rough.

I'll check the ditributor wiring. It's a fresh dizzy, so I'm a little confident it's not it.

zrickety

iTrader: (1)

TPS sensor

93 DET

Since my car bogging issue is really consistent (after 12 minute of constant rpm driving), I started to see what triggers it. Only constant rpms for about 12 minutes will trigger the bog. I will never experience bogging while driving in city. Also, if I disengage the clutch before 12 minutes of constant rpm driving and let the car rpms drop to an idle then rev match and engage the clutch, the car won't bog until another 12 minutes. I can't figure it out.

crvtectim

Haha, wtf? Are you sure you're reading the codes right? Read them again when it's acting up/bogging please.

wanabebuff

Mine was doing the same thing for a while, highway driving for around 15 mins, car would bog out and the only code I was getting was for the knock sensor. I found some loose wires in my ecu plugs, fixed that, and fiddled with the knock sensor connection and it hasn't happened since....knock on wood.

Doubt that helps, but thought I'd share my experience of the same thing happening, maybe its something similar. Good luck

Edit, also my car is an ef sedan b16a pr3 as well

93 DET

crvtectim and wanabebuff, you guys are awesome! I fixed the IACV and reset the ecu. Drove it around and started to throw code 23 (knock sensor). So know it makes sense why the car is bogging. I checked the plug wire on the knock sensor to the wire on the b19 blug for the ecu. They weren't the same wire color. So the plug for the knock sensor isn't giving info to the ecu.

I didn't even suspect the knock sensor because I just replaced a new one, but a wrong wire makes better sense. Thanks guys! I'll get that rewired up. Sucks, cause now I have to cut through my beautiful wire loom that I spent a good amount of time making it neat.

crvtectim

Yea sucks, but the reward will be sweet! VTAK and POWER SHIFTS bwahahaha!!!

93 DET

I rewired the knock sensor to the b19 pin. Drove the car around for 2 days, and it has bogged every single time. Weird thing is, it doesn't throw a code, so I’m guessing that the sensor is wired right. I'm going to do a continuity test on it some time this week to see if power is going to the ecu.

The only thing I can think of that I screwed up on was not using shielded wire for it. What I don’t understand about using shielded wire for the plug is that I will need to solder the shielded wire to the pin in b19, so there will be about an inch of non shielded wire by the B plug exposed.

So will I still get interference from the surrounding wires because an inch of wire is not shielded by the B plug?

wanabebuff

My man, b19 is for the KNOCK SENSOR, not the o2. That still may be your problem

Here's this for reference, I hope you get it sorted out!

http://www.swapshopracing.com/contents/en-us/d603.html

93 DET

I meant knock sensor, mah bad.

wanabebuff

ahh dang, i was hoping that was your problem then

joelercrxb16a

does it do it when its cold? or only when its warm?

93 DET

It has only has only happened when the car is fully warmed up. City driving is fine, but if I just keep a steady speed on the freeway for more then 15 minutes, it will bog for about 15 seconds. I think it might have to do with the TPS, because when it does act up, they're identical sypmtoms to a bad TPS. I just don't understand why it occasional and only at constant throttle.

93 DET

I recently swapped out the TPS for a new one, and unfortunately I still have the same problem. I set the new TPS position at the old TPS's former position. I get great throttle response, but I'm still getting bog issues on the freeway. I wanted to drive around for a week to see if it will eventually go away with the new sensor. It has been a week so starting tomorrow morning I'm going to adjust the sensor's position to see if it will clear it up.

Any suggestions?

wanabebuff

Did you set the TPS position by "sight" or using a paper clip on the plug and adjusting while monitoring with a multimeter?

hoss -05

Sounds like a clogging fuel filter to me.

Ed7si

1990 si b16a swap
The same symptoms were happening to me. I drove to Chicago and I was about to exploid with anger. On and off the throttle two hours in to it I stopped. I had just done a head gasket, timing belt and ect. I rushed it and this was the outcome. It was nothing mechinal it was the wiring. On of my friend broke both my o2 sensor plugs. I cut and soldered them an called it a day.

So any way that's the back story
When I stopped the car I cut the o2 sensor and switched them around and it happened no more!
Check the o2 sensor wiring and make sure they are going to the right locations, if they are not the ecu try's to correct what's goings on, it will not set a code. Because the values are correct it just reading the wrong runners in the exhaust mainfold

If it was a fuel filter it would bog on accleration not cruising it demands a higher volume of consistent fuel, if the fuel filter was bad enough cause "random" bogging at cruising rpms you would have one hell of accleration problems. Just saying


I hope that helps
P.s. my experience with what I have mentioned about fuel problems is that I am Honda
Mechicanic.