This is an odd one.

I have a 94 GSR with a swapped b16. AFAIK, the swap was done well, by a shop. It runs great, no problems other than this. Plenty of power, hits VTEC hard.

Here's the problem:

At about 1400-1500 RPM, so under part throttle when warm, when controlled by the IACV when cold, or even if at that RPM in 5th gear, I get a sort of stutter/bog. It's only at this small RPM range and there are no other problems.

I was wondering why, when I got the car, the IACV was unhooked. Turns out this may be why - while cold, the RPMs tend to hover right around the range where it bogs, which makes the whole car shake and the RPMS jump up and down from 1300-1500 pretty violently.

Note again that this is ONLY at this RPM range.

Any ideas?

I just replaced the o2 sensor AND cleaned the IACV.

 

what ECU are you running? could be dumping too much fuel

 

try to clean out the IACV and the fast idle thermo valve i think thats what its called, which is located under the TB, use brake cleaner to do it. do you have any CEL codes? if so, jump the ecu with a clip and record the codes, that should be your first step.

 

I have a code 14. I believe that 94s do not have a FITV, though. I cleaned the IACV and still no dice. Replacement, perhaps?

Also, I have the following problems in the engine bay that may be contributing to this:


This hose is cut to a very short length on the front of the IM.



This hose connected to the TB is not connected to anything and just has a screw plugging it.


This is connected to nothing, as you can see by the hose - I believe this is the EVAP canister.

 

Well your little hose that is cut off short is for the EGR valve. (If it sticks in the open position or fails to close all the way, it acts like a vacuum leak resulting in a rough idle, hesitation and possible stalling.) In other words if it is always open it could result in hesitation.

http://autorepair.about.com/od...5.htm
could be?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sottilde &raquo;</TD></TR><TR><TD CLASS="quote"> This is an odd one.

I have a 94 GSR with a swapped b16. AFAIK, the swap was done well, by a shop. It runs great, no problems other than this. Plenty of power, hits VTEC hard.

Here's the problem:

At about 1400-1500 RPM, so under part throttle when warm, when controlled by the IACV when cold, or even if at that RPM in 5th gear, I get a sort of stutter/bog. It's only at this small RPM range and there are no other problems.

I was wondering why, when I got the car, the IACV was unhooked. Turns out this may be why - while cold, the RPMs tend to hover right around the range where it bogs, which makes the whole car shake and the RPMS jump up and down from 1300-1500 pretty violently.

Note again that this is ONLY at this RPM range.

Any ideas?

I just replaced the o2 sensor AND cleaned the IACV.</TD></TR></TABLE>
Ok... I have a few questions....
1) Why did you swap in a B16?
2) Are you still using the GSR ECU? Because it's looking for secondaries in the manifold where the B16 does not have any, among many other things.
3) Do you still have the GSR block (not the head)? And if so, do u want to sell it?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SolAssassin &raquo;</TD></TR><TR><TD CLASS="quote">Ok... I have a few questions....
1) Why did you swap in a B16?
2) Are you still using the GSR ECU? Because it's looking for secondaries in the manifold where the B16 does not have any, among many other things.
3) Do you still have the GSR block (not the head)? And if so, do u want to sell it?</TD></TR></TABLE>


No. I did not do the work on this and it was not my idea to put in a b16. Previous owner entered into a 1.6 liter competition.

As for the EGR valve hose, where do I hook it in to?


I'm just trying to figure out where these hoses should go. If anyone has a comparable engine setup, if they could take pictures of where these hoses end up I would appreciate it greatly.


Edit: Also to note, this problem basically only happens with the IACV is hooked up.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by KevLo &raquo;</TD></TR><TR><TD CLASS="quote">Well your little hose that is cut off short is for the EGR valve. (If it sticks in the open position or fails to close all the way, it acts like a vacuum leak resulting in a rough idle, hesitation and possible stalling.) In other words if it is always open it could result in hesitation.

http://autorepair.about.com/od...5.htm
could be?</TD></TR></TABLE>

what are you talking about? the first picture is a vacuum cap on the PCV suppose to route to. there is no EGR valve on b series engine on civic and integra.

back to OP, doesnt look like a good swap, i hope they didnt swap the iat sensor and evap canister plug, coz it will either burn your idle control module on your ecu, or a burn iat sensor.

 

I'm just wondering where I should route all these things out to. The hose on the IM goes to the PCV or something like that somehow, but I'm just trying to figure out where exactly everything goes.

So I have:

Cut hose on the IM that supposedly has something to do with the PCV valve

Capped hose next to the MAP sensor on the TB

And a cut hose coming from the EVAP canister.

So the question is - where do these go? I'm sure this has something significant to do with my idle problem.

 

94 does have an fitv. Clean it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Boostedb20EH2 &raquo;</TD></TR><TR><TD CLASS="quote">94 does have an fitv. Clean it.</TD></TR></TABLE>

 

Somebody on TI suggested that it was possible the IACV plug got mixed up with the IAT plug.

This was the problem. Thanks guys.