I have a 94 Civic DX with a 2000 B20B in it. I went out to start my car this morning and it didn't have the usual high warm-up idle (1500-2000 RPM's) instead it was normal (700-1000 RPM's). I live in Cincinnati and it's cold in the mornings, like 35 degrees. Recently I changed the radiator and heater hoses, and it was a bitch refilling the system since there is no bleeder valve. Please help, I don't want to kill my engine.

 

I tried it again this afternoon. It did the same thing. It has an OBD0 LS TB on it. Could that be the problem?

 

wonder why your idle is so high. my b16a idles betwen 1000-1400 rpm on a cold day, maybe 40-50 degrees(he he, in texas, that's cold).

 

I think it should be fine just take it easy for the first few miles/minutes untill the car warms up.

 

Did you reconnect the water bypass hose?

 

I used to have a B18B Civic and in the morning I know it would idle around 1800 to warm up. My B20 isles around 1300 to warm up. Everything is hooked up correctly. I have a new style TB with a fast idle valve on the bottom. Would it help to put this on? In Cincinnati in the morning it gets as cold as 20 degrees.

 

Eh, couldn't hurt. I think fast idle is just to reduce cold start emissions, but it's also nice to have heat a minute or two earlier.

RS...who has braved ~20ºF mornings the past couple days.

 

It just worries me since it's so cold out and the idle is that low. In the summer it wouldn't bother me. How can I bump the idle a few hundred RPM's.

 

I don't see how a low cold idle would hurt the engine. I also don't think you can adjust the cold idle speed without cracking into the ECU. There is an idle adjuster screw on the TB, but that adjusts all idle speeds.

 

It idles that high cuz ur car needs to rev high to warm up the car thats y it automaticlly opens the throttle a lil wider, once it warms up it should drop back down to idle at normal RPM. Old cars dont have this thats y they have a pulley to manuel open the throttle longer called a "TracK or "Trek" the simple looks like this | \ |

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Regular Series &raquo;</TD></TR><TR><TD CLASS="quote">I don't see how a low cold idle would hurt the engine. I also don't think you can adjust the cold idle speed without cracking into the ECU. There is an idle adjuster screw on the TB, but that adjusts all idle speeds.</TD></TR></TABLE>Cold idle is usually controlled by the FITV, not really by the ECM. Some models/years don't have a FITV, then maybe the ECM has something to do with it. The FITV might not open up all the way when it's cold. People have had to clean or tighten their FITV when it idles too FAST - this is probably similar.

But I agree - slow cold idle shouldn't hurt the car. As long as it keeps running it's OK.