what can cause engine to idle high? on 2000 Oldsmobile Bravada

told that engine took in water after being stuck. code reader suggested map/bar ckt range/perf

by in Fruitland Park, FL on December 15, 2013
3 answers 6 comments
ANSWER by on December 15, 2013
Sounds like a vacuum leak, MAP sensor is not reading proper vacuum.
COMMENT by on December 15, 2013
replaced mass air flow sencor ,2 washer motor/vac. lines ,pcv sensor
COMMENT by on December 15, 2013
The washer has no vacuum. Do you have a vacuum gauge to test the vacuum at the MAP sensor. The MAF reads the air intake and air temperature.
COMMENT by on December 15, 2013
i dont have gauge is there anything else i cen do? To get idle down?
COMMENT by on December 15, 2013
Do you have the 4.3L
COMMENT by on December 15, 2013
yes V-6
COMMENT by on December 15, 2013
The first thing that comes to mind is the intake gasket failures on these engines. They used victor gaskets made with plastic. The plastic with rubber combination fails in time. Try some water in a spray bottle, and spray a heavy dose of water around the intake sealing area, at the valve cover seal. Try around the throttle body gasket area, and around the vacuum hoses. With engine running the idle should change if water is introduced at the leaking area. Let me know.
ANSWER by on December 15, 2013
I agree with#1
ANSWER by on December 15, 2013
Also, the idle air control valve may be sticking but you need a scanner for testing, not a code reader. Question,, is the transmission shifting like it should? IF not, possible throttle position sensor out of range which will also cause high idle. To test it a scanner is needed again, so i suggest have it scanned to check live sensor data for your problem.