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Old 02-11-2006, 05:32 PM   #1
Marshall
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Default Vacuum leak on my SL2?

I have a 1992 Saturn SL2 and I'm trying to diagnose my car's problems.

I get the following error codes:

22- Throttle position sensor out of range low
26- Quad driver output fault
32- EGR system fault

I'm trying to figure out what is wrong with the EGR system and I noticed something: the vacuum hose that comes out of the EGR vacuum solenoid (facing the back of the car) has no vacuum going to it. I would think that that hose would always have vacuum going to it, and the solenoid would control the vacuum that makes it to the EGR vacuum actuator. But on my car, there is no vacuum going to any of the hoses related the EGR solenoid.

Could this be the problem? Maybe the EGR valve and solenoid are fine, but there isn't any vacuum to make it work?


Thanks for your help.
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Old 02-11-2006, 10:42 PM   #2
eljefino
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Default Re: Vacuum leak on my SL2?

I think that EGR solenoid gets ported vacuum, that is, only above idle. Try revving it and seeing.

I would fix the throttle position sensor first, the computer bases its other decisions on good data from that.
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Old 02-11-2006, 11:19 PM   #3
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Default Re: Vacuum leak on my SL2?

Quote:
Originally Posted by Marshall
I have a 1992 Saturn SL2 and I'm trying to diagnose my car's problems.

I get the following error codes:

22- Throttle position sensor out of range low
26- Quad driver output fault
32- EGR system fault

I'm trying to figure out what is wrong with the EGR system and I noticed something: the vacuum hose that comes out of the EGR vacuum solenoid (facing the back of the car) has no vacuum going to it. I would think that that hose would always have vacuum going to it, and the solenoid would control the vacuum that makes it to the EGR vacuum actuator. But on my car, there is no vacuum going to any of the hoses related the EGR solenoid.

Could this be the problem? Maybe the EGR valve and solenoid are fine, but there isn't any vacuum to make it work?


Thanks for your help.
Its a PORTED vacuum source. At idle, the EGR valve line (going to the EGR solenoid) will have NO VACUUM. It will get vacuum at throttle settings above 1500~1800 RPM or so ONLY.

Do not assume the EGR solenoid are "fine" based on resistance tests. Many test fine COLD, but fail when hot.

The TPS code combined with the quad driver code suggests that there is a WIRING FAULT going to the TPS, or the TPS is bad. A bad TPS can also cause a malfunction of the EGR system, as the PCM uses TPS data (among other things) to determine when to turn on the EGR valve.
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Old 02-13-2006, 02:06 PM   #4
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Default Re: Vacuum leak on my SL2?

You may check the wiring plug going to the EGR solenoid - Mine threw the quad driver and EGR error when the connector came off. I fixed it with zip ties to hold it on. The connector is on the right side of the valve cover, nearly right above the EGR valve.
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