High Base Idle

[TriniGT]

So I drove most of the day today, car worked no problems. Almost reaching back from the trip home I find the base idle at a traffic light increase from the base 750 to 1200rpm. I check the water temp and it is at 88 and the oil is at 90, the day was pretty hot and I gave it a bit of stick but on cruise it began to fall to around 88 for the oil. Oil pressure is fine and at 12oorpm it is around 3 bar. Any thoughts why this is happening, coolant temperature sensor faulty? I reached home and switch off and waited a while and restarted and the idle is still at 1200rpm. Your thoughts?

Edited September 6, 2009 by TriniGT

[Wacky Dee]

not sure but iirc I've read here before that if a vac hose or intercooler hose comes off it can increase the idle like that?? Check all your hoses and clamps

[TriniGT]

Just finished solving the problem. Apparently the air filter/valve from the intake manifold to the BOV split in half, had a tiny separation so I put in a one way valve I had and ziptied it really snug and checked all other vacuum lines. Started and idle is rock solid as before. One less thing on the list.

[TriniGT]

Note to self and others, initially I replaced the vacuum filter as it had a split and put a one way valve, actually an extra one from a boost sensor I had. When I went for a test run the BOV would not vent at all under regular or heavy throttle and I would only hear compressor surge. I am not able to get the vacuum filter anywhere local so I opted to join both vacuum lines for now until I come across one. Should I worry with no filter for the BOV?