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ase_master327
ase_master327, Saturn Technician
Category: Saturn
Satisfied Customers: 5288
Experience:  +15 years exp.with Saturns. 5 time Expert of the Month. Bumper to bumper diagnosis and repair.
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The idle control valve located on 2001, SL1..1.9L..3000 RPM..Park

Customer Question

Where is the idle control valve located on 2001, SL1, 1.9L, located? Engine is idling 3000 RPM in Park. I've replaced Idle Air Control Valve, and Throttle Position Sensor.
Submitted: 4 years ago.
Category: Saturn
Expert:  ase_master327 replied 4 years ago.
Hi, it is the '4 wire' solenoid on the throttle body there..
Here is a picture that might help you:
graphic
Customer: replied 4 years ago.
I have already replaced this as well as throttle position sensor and cleaned throttle body. Any idea why engine idling too high (3000 rpm in park 2000 rpm in drive)?
Expert:  ase_master327 replied 4 years ago.
Hmm.. OK, Yes the main thing that will do something like that is 'off timing' and vacuum leaks. This egine has a timing chain, so we won't worry too much about the timing thing just yet. I would spray around all the gaskets and hoses looking for a vacuum leak first. Also make sure the throttle closes completely (of course). Here is a link to a pdf which I have put together for you explaining how to 'set' the IAC, and explaining the same thing..

If I have been helpful so far, click Accept so I can get credit for helping you. Then (of course) if you need more help, just let me know. Fair? Cool
ase_master327, Saturn Technician
Category: Saturn
Satisfied Customers: 5288
Experience: +15 years exp.with Saturns. 5 time Expert of the Month. Bumper to bumper diagnosis and repair.
ase_master327 and 3 other Saturn Specialists are ready to help you
Customer: replied 4 years ago.
Thank you,

I suspect a vacuum leak, but I didn't realize this would cause high idling.
Expert:  ase_master327 replied 4 years ago.
Yes, On fuel injected engines, all of the air that enters the engine is measured.. That is why the throttle is supposed to be completely closed, because the IAC i actually nothing more than a computer controlled vacuum leak directly through the intake manifold. So, if there is another leak somewhere.. IT will just make the IAC... useless.
If you have an engine light on, though.. I can probably go into more detail in pointing you in the right direction of the leak, but I would need the codes out of the computer.. and it is not too safe to drive idling at 3 grand.. so.. there goes that! Undecided
Customer: replied 4 years ago.
It just so happens I have a service engine soon light that I had analized at the local Auto Zone yesterday. Two codes P0301 (Cylinder misfire detected-cylinder number 1), and P0404 (EGR system fault). I replaced plugs and wires and drove back to have anaylized with the same results. I should also mention that this is my daughters car which she's had since 2004 with few problems. I rarely drive this car but I can't tell by the way it drives and runs that its missing??
Expert:  ase_master327 replied 4 years ago.
Well there.. A sticking EGR will cause a vacuum leak too.. internally. It might be dirty or just plain stuck open.. With the misfire, I would be looking at compression in the engine and condition of the spark plug in that #1 cylinder (may even be a problem with the crank sensor).. The EGR needs to be commanded open and closed (with a scantool) and then voltage from the 'signal' monitored at both settings, if it is clean and not stuck open.
Customer: replied 4 years ago.
Thank you, XXXXX XXXXX
Expert:  ase_master327 replied 4 years ago.
Sure.. let me know if you need anything else .

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