..doesn't run right? Okay here is the full story.

I have a 92 hatch with a 95 JDM B18C. I am currently using the CX harness that came with my stock motor, which runs fine, but I would like to switch to the SI/EX because it has VTEC, and 4 wire o2 wired in.

Whenever I use the CX harness, the car runs perfectly. Whenever I use the SI/EX harness, I can only rev up to 2,000 RPMs before the car starts to sputter and miss horribly. It will not even go over 2,000 RPMs. Once I put the CX harness back on, it runs perfectly.

Any ideas? This does the same thing on TWO SI/EX harnesses. I'm putting the plugs in the correct places so I don't think that's it.

 

Anybody?

 

??

 

also curious. ^

 

what ecu are you running. and how do you run a single wire O2 on a gsr motor.

 

just stick with the cx harness & call it a day.
adding vtec to a cx harness isnt rocket science

 

I'm not running single wire o2 on a GSR. I am currently running no O2 which is why I want to switch to the SI/EX harness.

I am running a Kenji P28.

 

just ruin the 4 02 wires hard wired to the ecu. problem solved vtec is only 3 wires, adn only 2 go inot the ecu

 

have you checked the wires on the IACV? i think integra's are two or and civics use three, or some **** like that...
can someone smarter help me out here?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by djsire &raquo;</TD></TR><TR><TD CLASS="quote">just ruin the 4 02 wires hard wired to the ecu. problem solved vtec is only 3 wires, adn only 2 go inot the ecu </TD></TR></TABLE>

I know this sir. But wouldn't it clean up the engine bay so much more, and have such a cleaner look if it all looked stock, instead of wires running everywhere?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RE- v8killa121 &raquo;</TD></TR><TR><TD CLASS="quote">have you checked the wires on the IACV? i think integra's are two or and civics use three, or some **** like that...
can someone smarter help me out here?</TD></TR></TABLE>

Hrm, might this explain why I can only rev it up to 2k RPM?

But why would my CX harness work, and not the SI/EX? They're both civic harnesses.

 

That is because the pinouts are different for the si/ex, look at the helms for your self, cause i have on right here. They also have a 4 wire o2 vs. the one-wire of the cx. I have a b16 in my 94 cx using the cx harness and a p30, I wired up the o2 to a 4-wire and the knock, vtec switch and pressure, and iab. I am good to go, just use the cx harness and repin the extra sensors needed. That is what i did and i haven't had problems in years.

To answer you question above, some of the differences in the pinouts from the main harness to the engine harness are the map and tps and iav sensor, which if not right will cause your car not to go above 2k.

So make it easier on yourself and use the cx harness and wire the extra sensors its not hard. The SI/Ex harness won't add any horsepower.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turboxsi &raquo;</TD></TR><TR><TD CLASS="quote">That is because the pinouts are different for the si/ex, look at the helms for your self, cause i have on right here. They also have a 4 wire o2 vs. the one-wire of the cx. I have a b16 in my 94 cx using the cx harness and a p30, I wired up the o2 to a 4-wire and the knock, vtec switch and pressure, and iab. I am good to go, just use the cx harness and repin the extra sensors needed. That is what i did and i haven't had problems in years.

To answer you question above, some of the differences in the pinouts from the main harness to the engine harness are the map and tps and iav sensor, which if not right will cause your car not to go above 2k.

So make it easier on yourself and use the cx harness and wire the extra sensors its not hard. The SI/Ex harness won't add any horsepower.</TD></TR></TABLE>

You are the man. Thanks for the actual answers and not some mumbo jumbo BS. I will remain using the SI/EX harness from now on then. Thanks man.

 

Thanks for answers.
Why thank him when ur not gonna listen to what hes sayin.
Making added wires look stock isnt rocket science either.
Just get sum electrical tape n sum wire loom

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tha_badguy &raquo;</TD></TR><TR><TD CLASS="quote">Thanks for answers.
Why thank him when ur not gonna listen to what hes sayin.
Making added wires look stock isnt rocket science either.
Just get sum electrical tape n sum wire loom</TD></TR></TABLE>

Oh ****, that was a typo. I meant to say I will remain using the CX harness. I already have vtec, and o2 hooked up, I just wanted a cleaner look.

Before anybody says, I am running a chipped p28, so no knock, and a victor x manifold, so no secondary butterflies.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turboxsi &raquo;</TD></TR><TR><TD CLASS="quote">That is because the pinouts are different for the si/ex, look at the helms for your self, cause i have on right here. They also have a 4 wire o2 vs. the one-wire of the cx. I have a b16 in my 94 cx using the cx harness and a p30, I wired up the o2 to a 4-wire and the knock, vtec switch and pressure, and iab. I am good to go, just use the cx harness and repin the extra sensors needed. That is what i did and i haven't had problems in years.

To answer you question above, some of the differences in the pinouts from the main harness to the engine harness are the map and tps and iav sensor, which if not right will cause your car not to go above 2k.

So make it easier on yourself and use the cx harness and wire the extra sensors its not hard. The SI/Ex harness won't add any horsepower.</TD></TR></TABLE>

94 cx civic came with a 4 wire o2 sensor and the 92 civic came with the single wire o2 sensor. thats why you are able to re use your cx harness because it already has a 4 wire o2. he has to wire the extra 3 wires to use his cx harness. and if you run the stock gsr intake manifold with the P28, the secondary butterfly will not work becaeuse P28 ecus dont read that sensor.

I just did my cousins swap its a gsr and i used a 92 si harness. all i wired in was the knock and IAB

 

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

94 cx civic came with a 4 wire o2 sensor and the 92 civic came with the single wire o2 sensor. thats why you are able to re use your cx harness because it already has a 4 wire o2. he has to wire the extra 3 wires to use his cx harness. and if you run the stock gsr intake manifold with the P28, the secondary butterfly will not work becaeuse P28 ecus dont read that sensor.

I just did my cousins swap its a gsr and i used a 92 si harness. all i wired in was the knock and IAB

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

Sorry bro but you are wrong. I have a 94 cx with a b16 and p30 ecu and it definitly didn't have the 4 wire o2, just 1 wire. I know because i did this swap among many others into the cx hatch and they all are one wire. I wired the two from the ecu for the o2 and the third o2 heater signal wire is the only wire that goes from the ecu to the cx's main harness but not into the engine harness(engine bay) and the fourth is the o2 signal which the cx only uses. And if you didn't notice i said i HAD to wire up the 4 wire i didn't say it was present in stock form.

Check the helms for youself its the same from 92-95 for the cx o2, and just so you are informed (because obiviously your not) the vx is a 5 wire o2, cx is 1 wire and all the rest are 4 wire (dx, ex, si).