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Old 03-15-2009, 08:02 PM   #1
theamcaddict
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Default P0507

1997 SL2
All Maintenance is up to date.
The following diagnostic checks have been done(No vacuum leaks,electrical does not appear to be damaged, and checked all sensor readings through TECH2.)
When working with the scanner(TECH2) I commanded the idle air control valve through the whole RPM range and the RPM's would not drop below 2200 initially but would go to maximum of 3000 which is the highest that test will allow. After allowing the car to run for 30-45 minutes and after TECH2 was disconnected the idle dropped back to normal only to return to being stuck at 2200 RPM's upon next start up. After all of that I put in a new coolant temp sensor and it idled fine for awhile until later returning to 1500 RPM's.
A good used idle air control valve is goin in on monday which should fix the situation.
Has anyone had a IAC valve get that stuck at a certain RPM consistently before?

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Old 03-15-2009, 08:14 PM   #2
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Default Re: P0507

yes i have. But it was not in a saturn it was in a 1990 isuzu impulse. I cleaned it and idle was fine for months but did end up going out on me completly. so i replaced it and ran fine.

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Old 03-15-2009, 08:22 PM   #3
theamcaddict
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Default Re: P0507

I left out the detail that I BLASTED this thing with a whole can of brake/throttle body cleaner while it was running and it did help. It initially only dropped to normal idle after running for 30-45 minutes.
Anyone else?

Last edited by theamcaddict; 03-15-2009 at 08:23 PM.. Reason: cause I want to

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Old 03-15-2009, 09:02 PM   #4
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Default Re: P0507

How do you know its the iacv that's causing the high rpm's? Why couldn't it be the throttle position sensor (TPS)? Those that have high idling problems, shut off the engine and then re-started again with the idle returning to normal, replaced their tps as the fix. There's also the thermostat that stays open and runs the engine cooler than normal, affecting the coolant sensor that can force the PCM to run the engine slightly richer in the fuel/air mixture and keep the idle higher.

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Last edited by fdryer; 03-15-2009 at 09:11 PM..

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Old 03-15-2009, 09:11 PM   #5
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Default Re: P0507

All sensors were reading great in the IAC special function section of the tech2.
It was reading %0 with throttle blade closed and looked fine all the way up to wide open throttle, Voltages swept all the way up to near 5 volts at wide open throttle also.
Sensor reads fine throughout the whole range.

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Old 03-15-2009, 09:31 PM   #6
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Default Re: P0507

I think you are fortunate to be able to use a Techtool II but equipment isn't the answer to everything. Its what between the ears that makes a repair a matter of parts substitution or someone that uses tools to determine a repair.

I've never seen or handled a crank position sensor (CPS) in my life but from education from this site and some knowledge of EFI I've been helpful to some members in determining their cps' as faulty. No equipment used, just reading descriptions from posts and careful attention to details. No crystal ball can ever substitute knowledge.

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Old 03-16-2009, 12:33 PM   #7
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Thumbs Up Re: P0507

CPS's are super common on those 3.0 motors. I've seen more than enough of those little buggers . Sometimes it's very convenient not having to take out the multimeter I must admit.

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Old 03-16-2009, 12:39 PM   #8
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Default Re: P0507

I, for one, am interested in the outcome of the IAC replacement. I would have been more inclined to suspect the TPS initially. Something has to be telling the IAC where to go. Its a simple stepper motor and has no idea where its at. There are a couple of other inputs that could do this also.

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Old 03-16-2009, 08:12 PM   #9
theamcaddict
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Default Re: P0507

Idle air control valve fixed the "stuck" idle.
Back to the original question has anyone had an idle air control valve that got that stuck?

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Old 03-16-2009, 09:11 PM   #10
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Default Re: P0507

It would be interesting to do a non destructive failure diagnosis on that IAC. Did you measure each stepper coil resistance by any chance?

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Old 03-17-2009, 11:00 PM   #11
theamcaddict
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Default Re: P0507

I did not check the stepper coil resistance. I have never seen the IAC get stuck in different positions like that. I've seen intermittent high idles caused by the IAC that go away when the engine is restart but this was a new one for me. The pintle valve was very clean but it was loose and had side to side play.
This was also clearly an aftermarket IAC that someone had put in a while ago.

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Last edited by theamcaddict; 03-17-2009 at 11:06 PM..

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Old 03-17-2009, 11:40 PM   #12
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Default Re: P0507

Interesting. It is not supposed to wiggle back and forth. Another high quality aftermarket part...not.

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