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Old 10-15-2007, 05:31 PM   #1
Jerz3455
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Default 98 Saturn SC1 SOHC, HIGH IDLE

Alright, this car has been kicking my butt all week. I have just recently aquired this car from someone, and ended up havin to change the motor. I put another one in, but when I start it up, it idles at 4500 rpm. At first she would idle at about 3000 rpm, and then I replaced the throttle body with the old one, and then it began idling at 5000. (just before redlining) So then I went ahead and replaced it back with the new one (that which came with the new motor from the junk yard), and it idles at 4000 now.. I dont know what esle to check. I removed the egr valve, sprayed some cleaner in it, and still havent helped much. And now, im starting to feel like cleaning the egr didnt help because I got a code 4 it now. But, im pulling three different codes. P0507:Engine RPM is higher than expected for the current operating conditions; P0122:Throttle positioning Sensor Circuit Low Input, and of course P0405: EGR Flow Sensor A Circuit Low Input. Im stuck. Please give me a solution.

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Old 10-15-2007, 05:37 PM   #2
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Default Re: 98 Saturn SC1 SOHC, HIGH IDLE

Really screamin' idle usually means a bigeffin' vacuum leak. Power brake booster hose, PCV valve hose, intake manifold gasket, something like that.

'Course, that 122 points to the TPS. Try tapping it with the handle of a screwdriver. If that settles the idle down, either the wire connection to the TPS is hinky, or the sensor itself is done for.

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Old 10-15-2007, 05:42 PM   #3
Jerz3455
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Default Re: 98 Saturn SC1 SOHC, HIGH IDLE

Alright... Because I want to say that I hear a little hissing sound when I shut it off.. Like when its shutting down, it sounded like it was an untightened hose, but I didnt want to make it worse than it already was.. Now out of the too sensors (on the throttle body), which one is the throttle positioning sensor?

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Old 10-15-2007, 06:10 PM   #4
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Default Re: 98 Saturn SC1 SOHC, HIGH IDLE

The TPS is the only sensor on the throttle body. It's on the end of the throttle plate shaft, on the back of the TB. The other connector on the TB is the IAC solenoid, which is toward the bottom of the TB.

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Old 10-15-2007, 06:48 PM   #5
Jerz3455
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Default Re: 98 Saturn SC1 SOHC, HIGH IDLE

Well. U said towards the back of the the throtte body?? Because there are actually two sensors on it. Right before it bolts onto the intake manifold, there are two different sensors. I dont know which one is which. I even started the car without them connected, and it still idles very high.. BUT... As soon as I connect them, it instantaneously drops the idle speed for a split millisecond, and then continues to idle high..

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Old 10-16-2007, 12:21 PM   #6
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Default Re: 98 Saturn SC1 SOHC, HIGH IDLE

To repeat: there are two connectors. The "higher" one, right behind the throttle plate itself, is the TPS (throttle position sensor). The "lower" one is the IAC (idle air contro) solenoid.

Two connectors, one for a sensor, one for a solenoid.

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Old 10-17-2007, 09:38 AM   #7
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Default Re: 98 Saturn SC1 SOHC, HIGH IDLE

+1 on the vacuum leak. Check your hoses for cracks and get some carb or brake cleaner and spray around the manifold gasket while the engine's running. If you hear a change in the idle, you've found the leak.

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Old 10-31-2007, 07:29 PM   #8
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Default Re: 98 Saturn SC1 SOHC, HIGH IDLE

How about the EGR valve? When I took mine off to clean it, I ran the car for about 5 seconds, and it really screamed, right up to the rev limit.

My car idles at about 2k when the car's warm and it's cold outside. Did it for the first time in about 6 months this morning. Replaced the ECTS about 6 weeks ago. This only happens after driving for at least a few minutes, then stopping and putting it in park or neutral. If I shut it off, then restart, it's fine.

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Old 11-01-2007, 10:37 AM   #9
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Default Re: 98 Saturn SC1 SOHC, HIGH IDLE

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Originally Posted by nivlem7 View Post
How about the EGR valve? When I took mine off to clean it, I ran the car for about 5 seconds, and it really screamed, right up to the rev limit.
That's because it was removed, which, by definition, constitutes a GI-NORMOUS vacuum leak (open port to the intake manifold). The EGR valve would have to be broken physically, structurally, as in cracked, and leaking vacuum to the atmosphere to do this. 'Course, the "spray something" vacuum leak test would reveal this.

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Old 11-01-2007, 11:45 AM   #10
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Default Re: 98 Saturn SC1 SOHC, HIGH IDLE

SOHC's are notorious for intake leaks right at the #1 cyl. Spray some carb clnr. there and you'll probably find it.

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Old 11-26-2007, 02:48 PM   #11
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Default Re: 98 Saturn SC1 SOHC, HIGH IDLE

anybody got a pic of the TPS? that would help me!

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Old 11-26-2007, 03:13 PM   #12
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Default Re: 98 Saturn SC1 SOHC, HIGH IDLE

This is going to show my stupidity in trying to replace the IAC in a quick fashion. I had the exact same problem after replacing the IAC. Remove the IAC and pull the spring down, twist the rod so that is comes out further, then put it back in. I had to do this a couple of times, mine ended up so that I could not see the head looking through the throttle body. I tried to get it close to seated but not touching. I don't think this moves a whole lot after it is installed. It gives you a lot more air than needed at idle if it is not within specs. That's what I get for not reading the notes that came with the valve.


Just an FYI, This also cured my slow to return to idle and High revs, at least so far. I think that the IAC was not properly adjusted on the old one I removed, just a little too far out.

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Old 11-26-2007, 03:16 PM   #13
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Default Re: 98 Saturn SC1 SOHC, HIGH IDLE

Quote:
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anybody got a pic of the TPS? that would help me!
http://www.youtube.com/watch?v=KD51U5eofqo

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Old 11-26-2007, 05:25 PM   #14
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Default Re: 98 Saturn SC1 SOHC, HIGH IDLE

thanks!

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