A friend of mine has a 94 civic ex (D16Z6) I gave him a b16 throttle body that I had laying around. He installed it with a new b16 throttle body gasket adjusted everything as soon as it was installed his idle was smooth for the 1st 2 days and now his idle is at 100-200 rmps. Im having the same problem with my brothers 93 integra that just got a b18b long block swapped in. What are we doing wrong and what should we look for?

 

There's an adjusting screw on the throttlebodies that change the angle of the throttle plate.

 

If your car is equipped with an Idle Air Control valve (IAC) make sure it is working properly. Go back and redo the entire idle speed adjustment procedure from step 1.

 

There's also a screw that allows additional air to bypass the throttle plate...without ever changing the angle of the throttle plate. This screw is aptly named "Idle Adjusting Screw" in the Helms manual and is usually located underneath a rubber cap.

Do not adjust the screw/nut that NAcoupeNA is talking about. It's preset from the factory to keep the throttle plate from returning to a 'fully seated' position (which would round out the bore and cause a perma-vac leak)...and also effects TPS output (which also has an effect on the idle).

 

Thanks for the tips.

 

yes this deffinately sounds like a TPS problem to me. Most people don't realize that the TPS has to be adjusted with a Volt meter to be in the right spot.

 

Since you mentioned this... my friend who has the d16z6 that just swapped in the b16 throttle body on his motor he would have to adjust the tps as if it was a b16? And for the guy that mentioned about the iacv, we tried cleaning it out on both cars and problem still remains. I will try to get the tps adjusted when I get a chance and see what happens.

 

you sure its not 600-700rpm?

the first mark is 500rpm then it goes by 100rpm each mark

dont even think its poissible to idle at 100-200rpm?

 

I have an a6 block with a z6 head, and after I did the swap I have been having idle problems at startup every once in a while. Usually if I give it a tap of the gas it will settle back to normal...