OK, I posted earlier about this problem and was told (as I assumed) to reset the ECU. I did this and after I'd say about 50-60 miles worth of driving in the last few day, it came on again today.

What can the problem be? Obviously it's something from the install, but I made sure that all O2 connections were tight (i didn't have the problem before)

Can it be just from the test pipe? Does the O2 sensor "know" that it's not passing thru a cat and therefore the light comes on?

I would prefer it to be off, but I want to keep the test pipe on, I like the power it gave. It's not going to hurt the car to have it on, but I won't be warned of any future problems that may arise. My warranty ends next June and I don't want to have to shell out $$$ later on either.

If you have an idea what I can try, please let me know. I know that there are others out there with this setup that DIDN'T have problems, I would like to hear from you.

Thanks in advance guys...

Jason

 

what kind of testpipe do you have?? Or maybe you have to put more cat material in the O2 bunge. The easiest way is to get rid of it is to get an obd 1 ecu and reprogram it. that's two birds with one stone. horsepower gains and noe CEL

 

I just had a straight pipe built from a local muffler shop...

what would the ecu give me as far as power? would there be any negative side affects from converting?

 

Can the Secondary O2 sensor be tricked like on the current gen Prelude? I'm sure it's picking up too much oxygen in the exhaust when compared to the 1st O2 sensor. You best bet is to get a high flow cat and not deal with the risks with your state law on running a test pipe. You don't want to run with the MIL light on because the car will be in open loop mode and you will be running extremely rich and also, you won't be able to get warnings from the MIL about other problems or bad sensors.

 

Better yet why not install a hi-flow cat and let us all breath a little easier Apologies if you actually drive your car exclusively on the track.

Sorry for being a ***** I just couldn't resist

Regards,

 

You *will* get a CEL then. You can use the resistor trick like some people do, but I haven't a clue about what kind of resistor to use or to which wire to hook it up to.

 

well I don't have state inspection or emissions testing so I'm not really worried about that. I can get a high flow cat, but I didn't want to! that will probably solve the problem, but I would like to solve the issue at hand.

Baby NSX- I don't want to sound like an @$$hole, but I'm trying to get help with my situation (sort of the point for this board) not criticized. If you don't care to help, don't respond to the post

 

I've never heard of this, it tricks the O2 sensor into thinking everything it OK? If you could find out more info on this, I'd appreciate it.


[Modified by typer98, 5:32 PM 6/19/2001]

 

Ok, the problem is that the secodary o2 sensor is not registering any difference in the exhaust, thus, the sensor thinks it is not working.

There are two fixes for this: one, put a couple of washers between the test pipe and the sensor, thereby raising the o2 sensor up in the test pipe. This (sometimes) tricks the ecu into seeing a difference, thereby recognizing different voltages, and subsequently thinking the o2 sensor is working.

The other fix is to plug the 2nd o2 bung and strap the 2nd o2 sensor to the top of the test pipe. Again, tricking the computer into "seeing" a change between the two sensors.

Another fix, this would be #3 for all those paying attention, would be to remap the ecu and remove the circuitry for the 2nd o2 sensor. Following along this line, you could also convert to OBD1 and not have to worry about it. That is the 4th solution.

Try it out.

 

Or run a Spoon ecu(any other will do too) which will bypass the emission stuff. Of course for 00 and newer itr's, you need an adpter harness.

 

Ok I'll shut up now

No hard feelings.

Regards,

 

The old testpipe thang. Call Godspeed and ask him if he has an OBD2 testpipe in stock. Get your ECU reprogrammed without emmision's signal's. Get a High flow cat and lose about 1 whp

 

I have the same problem every now and then. I have the Spoon Header and a test pipe and my check engine light only comes on rarely.

I noticed it happening when I was getting close to empty on my fuel gage. I started keeping at least a 1/4 tank of gas and it quit. It would stay on for 2 or 3 days sometimes and then go away.

Go figure.

 

I never let it stay on that long...my gas right now is almost full, so that's not my problem...oh well...

 

slowerthanu....I originally went to godspeed and he wouldn't sell me a test pipe if I didn't buy a header from him...I don't like being "forced" to buy something, so he lost my business, i got it elsewhere

Where could I get the ecu reprogrammed? I'm pretty sure comptech does it...but that's $$$$, right?


[Modified by typer98, 10:19 PM 6/19/2001]

 

"I just had a straight pipe built from a local muffler shop..."

Ouch.. Test pipes are tricky. They'll throw CEL's.
Even the Spoon catalytic 'jack' adapter thing throws CEL's.

You can either spend money for a harness + Ecu to drop to OBD 1 ...
or you can pick up a Custom cat (which I sell on the side, email me privately) that will keep your vehicle CEL-Free.

 

Type R 98, the reason your check engine light is coming on is because it doesn't have the cat material around the O2 sensor. Even with the spoon cat your check engine light will come on. Placing the O2 sensor outside the cat will not allow the o2 sensor to get hot enough, so your light will still come on.

Here are two options:
1. Take your O2 sensor out and wrap your O2 sensor with tin foil, then wrap metal wiring around to hold everything in place. Screw the O2 sensor back in and your light will disappear. The only bad thing about this is you will have to do this about every month, due to the tin foil burning away.
2. E-mail this person: tommy@qualitycollectionservice.com You can mail him your test pipe or order an OBDII pipe from him. His test pipes have the cat material around the O2 sensor so the check engine light won't come on.

 

I have OBD-II pipes in stock as well.

 

check 3 posts up God...I tried to get a pipe from you and you refused to sell it to me.


[Modified by typer98, 8:53 AM 7/19/2001]

 

I bought my test pipe from god and he didnt require me to purchase a header as well. Probably you should call him and speak to him again..

 

Why would he? He will end up with 2 testpipes and still end up with the same problem. I say get a high flow cat and drive the car worry free.

 

I have already done that...this is a pretty old post...but anyway, a lot of people make the test pipes (god included) w/ some cat material by the second O2 bung, therefore preventing the CEL from coming on...I have determined that this is my problem...

Oh well, I'm just gonna get a high flow cat anyway.

Kilohead36...Well he wouldn't sell one to me, and I call that bad service (no service, really) I will not be buying any future parts from him either...I can spend my money anywhere, if someone doesn't want it, they shouldn't be in business.

 

Well, the test pipes had to be switched from one supplier to another. In the process we redesigned them for better fitment. Unfortunately due to extreme short supply we had to provide the test pipes to our header customers only for a short period of time. We are now stocked up again and production is running smoothly. I doubt we'll have a shortage again.

 

You can try run a 10K ohm resistor inline of the signal wire of the sensor. Just make sure you reset the ECU after you do this.

Craig
01 ITR

 

If you get a testpipe and you have your stock muffler the car sounds nasty. It's almost sounds like the muffler is rattling. Get the high flow cat.
Also Godspeeds test pipe works until the small piece of cat breaks. It's so small that it breaks too easily, then your check engine light comes on.

Godspeed you need to make the housing for the cat larger, to hold a larger cat. And your cat is still too long by about 2 inches. Two of my friends bought the test pipes and now they have high flow cats.