First let me give you the details on the setup. Its a 91 CRX Si w/ a obd0 B16. I believe the ECU is from a JDM crx. IAC, Skunk2 mani, DC header, exhaust. Also has some headwork done but i dont think that matters.

Okay so I've got two major problems:

1) The car idles WAY to high. Cold or Hot - the RPMS stay steady at 1900-2100K.

2) It will hesitate through the RPM range when given between 25-60% throttle. Almost like a sputtering or misfire.

I thought the idle problem had to do with the vacuum lines, so i checked them and they seem to be right. No cracks or leaks. I "think" the IAC is working properly. Could it be the TPS? Ive also heard of the thermo valve being bad. Poor alignment of the throttle body/manifold? I've heard of other people's cars having a surging idle. Mine doesnt surge... it just remains steady at 2K.

So Im driving along on a regular day. If i baby the throttle up the RPM range, it will accelerate smoothly. But anything past 25% throttle it will hesitate and sputter. At WOT its not as noticable but i can still feel that it's losing power. Could it be the o2 sensors? Could someone explain to me in detail what I need to do to check this? I know you're supposed to switch the sensors around. But dont obd0 b16's only have one o2 sensor? I havent had the time to get under the hood and check.. but i will today. Any other suggestions?

I also have a VAFCII. I find if I mess with the sensor number setting. I can get the car to idle at 1200. When it's set to 5 and 6 - 1200. At the default setting of 6 and 6 - 2K idle.

Well thats that. Im gonna start digging around when i have time saturday morning. Just want to get some advice before then so that i may have some direction on what to focus on. Thanks in advance.

 

Im not sure about your idle problem..Are you getting any codes
But you need to have 2 o2 sensors installed if running a stock pre-obd pwo or pr3..
Read this ..http://www.hondata.com/techo2problem.html

 

No no codes. Check engine light stays OFF at all times. If the o2 sensors are not wired correctly as it says in that link (one instead of two), is it supposed to throw a code?

 

is the vafcll your problem? is it hooked in right and if so, is is screwing with your car more than helping it??

 

If you have the 02 sensors spliced together to run just one sensor, it will not throw a code. It won't get the best readings like the article says.

 

Turn down your cold idle and your warm idle. It's 1 screw I beleive on those old school motors. Might have a nasty vaccum leak, I know when I had mine my H22 cold idle was 2900rpm, fixed that and it went to 2200rpm, then I cleaned my EGR valve and it went back to 1500rpm at cold, after I screwed it to that level, it was at 1300rpm I brought it up.

As for the power loss, check your plugs and ignition. My civic had bad firing on half throttle/full throttle, did a tune up and she was good again.

 

"Turn down your cold idle and your warm idle. It's 1 screw I beleive on those old school motors. "

How do I do this? Are you talking about the screw on the IAC?

 

The idle problem sounds like it's related to vacuum. I would check to make sure the hoses are in the correct configuration? Also, have you tried messing with the idle screw on the TB?

The hesitation sounds like your O2 sensors. I had the same issue on my B16 and after I wired them correctly it worked fine.

 

no the screw is on ur TB

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Suck my DX &raquo;</TD></TR><TR><TD CLASS="quote">no the screw is on ur TB</TD></TR></TABLE>

yeah... ive tried that. It's already turned flush to compensate for the high idle.

Hey LUD... what screws are you talking about? Sorry if I'm not too familiar with what you're talking about. This is my first swap so I'm learning hands on. Thanks.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by t3h WIN &raquo;</TD></TR><TR><TD CLASS="quote">is the vafcll your problem? is it hooked in right and if so, is is screwing with your car more than helping it??</TD></TR></TABLE>

 

true that ive seen improperly wired vafc's cause all sorts of problems

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Suck my DX &raquo;</TD></TR><TR><TD CLASS="quote">true that ive seen improperly wired vafc's cause all sorts of problems</TD></TR></TABLE>

yeah. I'll def look into that. I just picked up another TPS sensor last night so im gonna see if it makes a difference. Anybody have detailed instructions on how to set the TPS upon installation? Im gonna google it....

 

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

yeah. I'll def look into that. I just picked up another TPS sensor last night so im gonna see if it makes a difference. Anybody have detailed instructions on how to set the TPS upon installation? Im gonna google it....</TD></TR></TABLE>
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