So, I'm kinda up against a wall here. I'm registered for a track event coming up next month. I only have limited time to get the car ready for the event. Here's what I'm up against. I was planning on getting the Hondata S300 system installed and the car tuned before the event. Problem is that my tuner is booked up (I only have the weekends) and that's not going to happen so I'm left with a few choices. I have no cat, or test pipe for that matter, the "downpipe" bolts right to the collector so there's not even a secondary bung. Currently with the setup, I have the secondary o2 completely unplugged and thus the check engine light. So I'm left to figure out what to do. But with that I have a few questions as well.

First off, since I can't fool the computer to not look for the secondary o2 without the Hondata will an OBD1 harness not look for it and thus no check engine light? If left in the current condition, will the car run rich or lean? (primary is there and intact but I don't really understand the flow and measurements the primary vs secondary play, I know the first reads and the second sends the adjustment signals to the ECU) If rich, I really don't have a problem with that but I'd rather not lean the car out for obvious reasons. Another option I have is to plug in the secondary o2 and either do the radio shack resistor trick or the aluminum foil trick, but again if the secondary reads nothing will the car run rich or lean?

Any suggestions, or even ideas I have not included. I'll be getting the car fully tuned shortly after the event and it won't be looking for the secondary at that time. Will the OBD1 harness take care of this for me since I'll be needing to get it anyway for the Hondata?

Thanks guys.

 

The secondary is a check for the emissions system. It is there simply to make sure the primary O2 is working. If both sensor's read within a certain % of eachother, the ECU thinks both are working.

OBD1 ECU's do not check for the secondary, so running an OBD1 ECU will remove any CEL. I have a couple OBD1 Crome maps for bolt-on ITR's if you have a chipped ECU and access to a burner, I can send you these files.

The secondary CEL on a OBD2 ECU does not change how the car runs, it is simply a check. You will not run more rich/lean if the secondary is triggered.

FWIW I ran for about a year with the secondary O2 CEL while I waited for my tuning hardware to arrive.

 

obd1 = doesn't look for secondary o2 sensor

solution = run obd2 ecu now (you just have bolt-ons, correct?) and plug the secondary o2 sensor in. You can wrap it in foil, or use a fooler to not get a cel... which isn't bad anyway, as it doesn't affect anything but emissions cel. The car runs off the primary, and the 2ndary o2 sensor code is just an annoyance, with no affect on a/f ratios.


-hth


err... he beat me to it!

 

Thanks guys.

So what your saying is the secondary will not cause the car to lean out, even if wrapped in aluminum foil? That's my biggest concern is running the car lean under the conditions the car will be in.

Marshall, it's just the stock ECU for now. I appreciate the offer of the files.

Now, when I talked to len he mentioned that the temp will also play a factor in this. If the temp is not in the range it's supposed to be, then it will trip the CEL. Can I just "mechanic wire" the thing basically on the outside of the exhaust to keep the temp close?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Black R &raquo;</TD></TR><TR><TD CLASS="quote">err... he beat me to it! </TD></TR></TABLE>

Dave and I still love you though Kenny and we have decided to adopt you as our Radiation Baby.

Aluminum Foil FTW!@!@!@~ for now...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by len &raquo;</TD></TR><TR><TD CLASS="quote">

Dave and I still love you though Kenny and we have decided to adopt you as our Radiation Baby.

Aluminum Foil FTW!@!@!@~ for now...</TD></TR></TABLE>

So do you think the "wiring" it to the exhaust will keep the temps up?

 

Dude, just unplug the damn thing and run with a CEL.

It's just for emissions checking as already stated twice. It won't make you run rich or lean or advanced or retarded. Well, you're kinda retarded anyway...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Chris F &raquo;</TD></TR><TR><TD CLASS="quote">Dude, just unplug the damn thing and run with a CEL.

It's just for emissions checking as already stated twice. It won't make you run rich or lean or advanced or retarded. Well, you're kinda retarded anyway...

</TD></TR></TABLE>

LOL.

It's all good, I figured out a way to get the car tuned anyway. This can be deleted at any time...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Chris F &raquo;</TD></TR><TR><TD CLASS="quote">Well, you're kinda retarded anyway...

</TD></TR></TABLE>

Tell me about it Chris. Regardless of how much degree of advancement is done, Dave will still be retarded. It's one of those things that you just have to accept for what it is Dave.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by len &raquo;</TD></TR><TR><TD CLASS="quote">

Tell me about it Chris. Regardless of how much degree of advancement is done, Dave will still be retarded. It's one of those things that you just have to accept for what it is Dave. </TD></TR></TABLE>

Yes yes, so true. Sadly, there is not advancement that can be done to correct it either.