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Sounds like the air intake manifold gasket getting bad. Easy way to test this is when it is idling high, take a can of brake cleaner and spray it on the air intake, all around the gasket. If the gasket is bad, the car will change it's idle as the cleaner is sprayed on it. This happened to both of my 02 saturns. The air intake manifold gasket is located on the back side on the top of the motor. Very easy to get at and a very easy test. To locate it , look for the throttle cable on the throttle body. Look to the left of that and you will see the air intake. It's an aluminum manifold held on by 8 ten mm nuts. Right behind the fuel injectors. You can also use ether or quick start, and it wont take much. If the idle changes, you intake gasket is bad. Let me know how you make out
Replace the valve cover gasket if the valve cover gaskets are
leaking or if they're worn. The procedure is as follows:-- 1)First of all let the motor cool down if the car was recently driven. Then remove the air
intake boot.The air intake boot ios attached to the engine's throttle body. 2)Carefully disconnect the throttle
cable , hoses and electrical connectors located on the upper intake manifold. 3)Then disconnect the hard pipe that is
connected to the EGR (exhaust gas recirculation) valve. 4)The EGR valve is located beneath the upper intake manifold. 5)Then remove the bolts from both the upper intake manifold and the manifold
support bracket. 6)Now the upper intake main fold and
lower intake manifold both have got loose as you removed the nut. 7)After that remove the upper intake
manifold from the lower intake manifold. Carefully place clean rags over the
intake runners to prevent anything from falling into the intake system. 8)Then you will have to disconnect the
crank case breather valve on the valve cover. 9)Then remove the bolts from the valve
cover and remove the reinforcing straps. 10)Then remove the camshaft belt cover
and the dust shield from the back of the camshaft sprocket. 11)Now carefully remove the valve cover.
Properly clean the old gasket material with gasket remover. 12)You can install a new gasket in the reverse procedure of removal.
Well basically, you remove the intake plenum and replace the gasket and reinstall the plenum. Here are the steps:
1. Disconnect the negative battery cable from the remote jumper terminal located at the right strut tower. 2. Remove the air inlet resonator and tube. 3. Remove the throttle actuator cables from the throttle arm and bracket. 4. Disconnect Secondary Runner Valve (SRV), Manifold Tuning Valve (MTV), Throttle Position Sensor (TPS), Idle Air Control (IAC) motor electrical connectors. 5. Remove the electrical connector and the Intake Air Temperature/Manifold Absolute Pressure (TMAP) sensor. 6. Disconnect vacuum hoses from the Secondary Runner Valve (SRV) reservoir, Speed Control reservoir, and PCV. 7. Remove right and left intake manifold supports. 8. Remove support brackets at the intake manifold front corners and MTV. 9. Loosen upper fastener attaching throttle body to support bracket. 10. Remove clips attaching EGR tubes to intake manifold. 11. Remove intake manifold bolts and manifold 12. Remove old gaskets, Clean gasket surfaces, and install new gaskets. 13. Reverse steps to reinstall manifold
This was a common issue with these engines. Unfortunately there is no easy way to fix this problem other than to remove the intake manifold and replace this plastic tube along with the intake manifold gasket itself, these engines were common for the intake manifold gaskets leaking and also for that tube to crack over time and start to leak as well.
Like i stated, unfortunately there is no real "easy" fix for your problem. I have replaced many of these tubes and many intake manifold gaskets on these engines. I would not recommend doing it yourself unless you are familiar with these engine, there are special torque specifications for all the bolts. I do know that the intake manifold repair job usually runs somewhere in the ballpark of $800 - $1000 or more depending on where you take it.
I had this happen to me the first time I replaced my intake manifold gaskets. It was hard to install the intake and gasket moved just enough and I had a coolant leak. Removed manifold and installed new gaskets and problem was solved. Good Luck.
If the manifold was replaced, install or connect the following:
Vacuum source manifold.
Positive Crankcase Ventilation (PCV) valve.
Manifold Absolute Pressure (MAP) sensor.
Throttle body assembly.
Upper-to-lower intake manifold carrier gasket to the upper intake manifold.
Carefully place the upper intake manifold onto the lower intake manifold. Ensure that the alignment pins in the upper intake manifold align with the holes in the lower intake manifold.
NOTE: Apply thread lock compound, to the bolt threads before assembly.
Install or connect the following:
Upper intake manifold. Tighten the upper intake manifold bolts in sequence to 89 in lbs (10 Nm)
Accelerator and the cruise control cables with the bracket to the throttle body.
EVAP purge solenoid vacuum line to the throttle body.
Connect the electrical connectors to the following:
Mass Air Flow (MAF) sensor
Manifold Absolute Pressure (MAP) sensor
Idle Air Control (IAC) valve
Throttle Position (T/P) sensor
EVAP purge solenoid
Install or connect the following:
Throttle body upper support bracket bolt. Tighten the bolt to 89 in lbs (10 Nm)
EGR valve wiring harness heat shield, nut and the bolt. Tighten the nut and the bolt to 89 in lbs (10 Nm)
oil from the pcv valve going into your intake manifold will cause a gasket to swell. but it should not be to the point where it's noticeable. you should probably replace the intake manifold gasket at this point.
drain coolant , remove and mark all vacuum lines , make a schematic to diagram your hose routing, disconnect and plug all fuel lines, remove distributor and mark location of rotor, disconnect battery, remove any necessary cables, brackets and or accesseries, remove intake mounting bolts, note length of bolts and reference location, pry up on intake , remove intake, scrape old gasket off , must be very clean to reinstall new gasket or you will cause a leak..