Hey all, recently picked up an EF Sedan, It came with a B18B1 and a 93 GSR tranny, It idles a little funny and higher then it would normal so i figured it was because its an OBD2 intake manifold running OBD0 injectors and harness wiring. Now there is a plug right on top of the manifold, for some type of sensor that nothing is plugged into, I am going to say its safe to assume only an OBD2 harness can plug into that sensor, would these be causing my idle problems? If so should i get an obd0 manifold and replace it or convert the car to obd1/2? thanks for ur help! its in a 1990 EX w/ MPFI stock

 

the obd0 injectors are on purpose so as not to have to convert to high impedance injectors to run the b18b. you should leave them alone.

B swaps are notorious for having strange idle issues, sometimes related to the FITV or IACV. I would stick with the GSR manifold, if that is what you have, as it flows a lot better than the stock b18a or b18b.

As far as the plug you are talking about, I am not terribly familiar with what you might be talking about, though a picture may help.

 

i have an ls in mine and it idols perfect, check your iacv

 

thanks for ur input, i was assuming some type of sensor on the intake manifold, most sensors are easily replacable to fix so ill just start with the IAC and TPS, ill tkae a picture of the unplugged sensor i was speaking about tonight, thanks for your input.

sometimes it idles normal at around 1kish but i still think thats a little high, its usually fluxuating between 1-1500rpm, would a gsr intake manifold even work on a B18B1? or are u talking about the B17 GSR?

 

oh ya one thing i forgot, if the IACV is bad, would i have to get a new OBD0 IACValve? or does it depend on my current setup? I can tell difference in plugs between obd0 and obd2 so ill be able to tell which is in later but im assuming obd0 since no wiring was modified

 

Love the misspelled word.
Made me laugh!


I see some talk about the GSR intake manifold flowing better than the LS.
Downside is the secondary butterflies that your ECU would have to control.
You would have to be chipped or run a P72.

 

sorry for the bad pic quality, the sensor is in the top pic, right on top of manifold

 

ok i got home tonight and it was idling and i got a CEL, code 43, thats usually the fuel system idk if this could be related or not, the o2 sensor is new, the fuel injectors have been replaced and i have a new fuel filter in the car. I think im going to replace the TPS sensor. i have a multimeter to calibrate it, which setting should i put the multimeter on to test the correct voltage w/ and w/o throttle body open.

 

whats the point in honda tech if u guys dont help...isnt that the reason for this site?

 

No one here is getting paid to answer your questions. The point of honda-tech is to provide information for users to help themselves, and to provide a collective location for people interested in Hondas to discuss topics that interest them.

As for your problems, the first rule of thumb is ALWAYS fix your CEL issues first, to see if your other issues go away. Blindly trying to change parts that may or may not be related will just make the problem worse. Don't make it worse. The CEL issue is staring you in the face, relentlessly blinking out your problem. Why not try and fix it?

code 43 is a fuel delivery issue. it could be your fuel pump is failing or being undervolted, a vacuum fuel pressure regulator hose came off or has a hole or an aftermarket steady state regulator is causing the ECU to flip out, a fuel system fitting could be loose, or even some issue I haven't specified could be the problem. searching "code 43" in the integra forums will probably return many tutorials on how to fix a code 43, and point out common failures that cause it. doing the same in the EF forum with "GSR" added to the query will likely also help.

As far as the sensor being unplugged, It is probably the GSR map sensor, as it is located on the firewall on the EF. The EF signal wire for the map is likely being used, so that sensor is unplugged.It remains on the manifold because the hole underneath it needs to still be plugged by something otherwise there will be a vacuum leak. That is just a wild guess though, because i am completely unfamiliar with the GSR manifold layout. Your CEL is unrelated to the sensor, so you can ignore it anyway.

if all else fails, go to google. then type in "site:honda-tech.com code 43 GSR" and see what comes up. then try different permutations of that in google and spend a few hours reading through the results. Familiarize yourself with common causes of a code 43, common issues with GSR swaps into an EF, and try to make sense of what is going on with your car in the context of what people are saying in the forums.

Every single problem here is unique in some way. there are lots of people here who can provide guidance on what to look for, but we can't jump through the internet and diagnose your car for you. We can only go off of information you provide and pictures you take.

 

43 doesn't always mean fuel system.
None of the fuel system parts have an individual sensor on them to monitor their workings.
(New OBD2 cars have a pressure sensor in the gas tank)

It actually means your O2 sent readings to the ECU and they aren't in agreement and has determined a condition that would typically be fuel related.

I have a suggestions to add to the possible problems that 'sanimalp' gave you.

- Gas tank cap leaking. Does the tank hiss when you take the cap off? If not, then maybe it's not sealing correctly.
- Vacuum leak. How exactly is your idle funny?
- Is your ECU chipped? Aftermarket maps are notorious for running rich.
- GSR has that secondary set of butterfiles. If those are not operating (LS eCU won't run them) and are not disabled to be kept wide open then there you have an air/fuel mix issue to deal with. If you have the GSR manifod on then this is probably the plug that you don't have connected - search for 'IAB'.
- Aftermarket O2's sometimes SUCK. What brand do you have?

 

All that is very true. You make a good point about the O2 sensor being possible. if he is running obd1, that is one of the main causes of a code 43, especially on cars looking for 2 O2 sensors, given the number of hacks out there to mimic a second O2, or use a 1 or 2 wire in place of a 4 wire.. etc.

He didn't mention what ecu he was running, so that makes things particularly difficult too..