I just got done swapping my motor in my Integra. I just swapped in a GSR with a blox Intake manifold and i put on my Ls TB on it. The car would idle at 1300-1500 at start up but after it gets warm the idle starts to drop down. It drops all the way to like 200-300 rpm. If you don't give it gas it will stall. It does the same at the lights also. If it stalls and you give it gas it starts right up. I'm running a P72 ECU chipped so it doesn't look for a O2 sensor. Doesn't have CEl. I also tried my Ls ECU to see if it does a difference but didn't notice anything. Its currently not running a O2 sensor. I don't think that should be affecting it because most of my other cars I don't run a O2 sensor and its fine. Before the TB worked perfect on my Ls motor. It idled at 800 rpm only but now it idles low. If you have encounter this problem tell me. I need to get this car to work as its my only car. I am about to seafoam the car tomorrow to see if it will do any driference.

I already tried cleaning the IACV, adjusting the throttle cable, idle screw, ecu change, checked vacumm lines. I don't know what else to check now.

 

check for vaccuum leaks and adjust your tb screw

 

I checked the one that goes to the intake manifold and I am running the PVC valve also. What other vacumms can there. I already messed with the TB screw. Kind of stumped. First car ever that ever did that to me.

 

This happened to my 95 GSR also and it turned out to be a bad intake mani gasget

 

oh I will double check on that.

 

could be the intake mani gasket, from what your describing you have some form of vacuum leak, easiest way to find it is when you are at idle spray some carb clean where gaskets are and vacuum lines, if your idle goes up you found your leak, hope this helped

 

You guys are smart. I just looked at the intake manifold today and seems like its not in the best shape or the gasket seem loose. Will take the manifold off tomorrow and check. Hope thats my problem. Also would a bad Intake manifold gasket be causing some CELs? I am currently having code 3 which is Map sensor, Code 14 EACV, Code 1 Oxygen Sensor. The Map sensor and EACV are brand new and was on my other motor and they idled fine at 800 rpm. Before I only had CEL for Oxygen Sensor but didn't have this problem.

 

The bad gasget will cause the CEL to come on for one of the intake codes ( I can't remember which one ). The oxygen sensor one was on my car too, i replaced it and it still never went out sometimes it could be a defective sensor.

 

just got done replacing the intake manifold gasket. Problem is still there but no more CELs. Which is a good thing but I am still having low idle and stalling at stops.

 

Check ur idle air valve control maybe is that.... I have the same problem I still don't kno what's wrong with it

 

Sorry I already checked it and its never been tempored with. It came from a good idling 700-800rpm car.