Ok, I have been trying to fix this 1990 integra now for about a week. First the iidle was too high because the throttle position sensor was broken and the vacum lines were messed up. I put a new sensor on and re-did the vacum lines correctly. Now the idle goes up and down from about 1000 to 2500, it's so annoying and embarassing. I need this car fixed asap so I can sell it.
I took the valve off the back of the intake manifold and let it sit in sea foam for about 15 minutes to clean it. Should I let it sit in there longer? Should I use something else to clean it? I couldn't get the whole thing aprat cause it has an odd hex bolt i don't have a tool for, do I need to take that out to get it full disassembled?

Any other suggestions? It's just a goofy idle, it's throwing no codes . . . . .

 

O2 sensor would be my guess. Also check for heavily corroded spark plugs.

 

no, if the 02 sensor was out it would throw a code. I guess I haven't checked the spark plugs, but I really doubt that's the problem. . . . .

 

same problem just occured on mine and my neighbors car has been doing it forever. so if ya find out let me know.

 

check your idle valve...take it off and clean it up...

 

Did you read my fist post? I already tried that. I'm going to try cleaning it with something else, and let it sit in the solution longer.

 

map sensor?

 

haven't tried new/different map sensors, that is an idea . . . . . thanks . .

 

I figured it out. It was the fast idle thermo valve. It's held on by 3 10 mm directly under the throttle body. You have to take it off (leave coolant lines on) and pull end off (2 8mm) and there's a little piece of white plastic that get's loose inside. Tighten all the way down and it's fixed. When that's loose it creates a vaccum leak.