I don't know if they are related, but I'm still getting a rich condition, so I scanned 2 other 3.1 V6s. I noticed on the other 2 cars that the CCP solenoid cycled on and off while driving and mine ALWAYS stayed off no matter what the driving conditions were. I've replaced the solenoid to no avail in its operation through the scanner. The scanner also detected alot of knocks being detected and I'm wondering if the EGR and the CCP are tied in together since I had got a code 32 one time and that was intermittent. I'm going to try changing the plugs out just to do it and check the dizzy and rotor. Its' idling like crap anyways and goes up and down when at a light stopped. Doesn't do it all the time, but it is annoying. I'll diagnose the EGR like the shop manual says. I'll have to rig up something to ground the solenoids to test.

Ken

 

For the EGR, use a 9V battery with a pigtail connector. That's how I found out the wiring in my Grand Prix was screwy... IIRC, the red positive wire goes in the middle, and the ground wire is touched to any of the other 3 with the engine running. If the engine stumbles or stalls, the valve is good and you need to look elsewhere. :edit: The positive wire goes on the terminal closest to the connector's locking tab on the small end, terminal "D".

However, if I were you, I'd look at my GAUGES fuse to see if they are getting power... They're both on the same circuit. Check for power at either solenoid. Lack of power at both means you should check the wire coming out of the C100 at A7... This is assuming the fuse is good and you have things such as your brake lights, SIR system, and the gauges and lights in the instrument cluster.

The EECS (GM term, I just call the thing the charcoal can) canister is supposed to be turned OFF off-idle and at a set vehicle speed. Seeing as how yours is always OFF, that would be another good reason why you're running rich. The solenoid closes off venting to the engine until the vehicle starts moving.

 

with your key on and engine off, your radiator fan doesn't run all the time, does it?

 

Nah, the fan doesn't run unless I had the ALDL jumpered pulling codes. And the only other time is during normal operation when the temp. gets high and it turns on. I'll check the gauges circuit. I seem to get power to brake lights and cluster with no abnormalities while the car is running. I need to find out what circuit the purge solenoid is on or tied in with to see if there is a short or something. Thanks guys, that'll give me a starting point,

Ken
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Forgot... has anyone ever taken this bulk connector off to clean the contacts? I've never had it off since I have the car. Isn't this the engine connector that connects to the inside of the car? Looks like a good place to start looking for bad wires and contacts.

Ken

 

Good luck if you're going to do that. That crap that IS on those contacts (even if you think nothing is actually on the terminals, it really IS) WAS dielectric grease (I think?) back in 1991 or whenever... Now it's concrete. Trust me... I've soaked that part of my 91 harness in PB Blaster and GAS and that stuff didn't hardly soften one bit.

Like I said before, the GAUGES fuse powers both the purge solenoid AND the EGR valve through that big connector in your pic at terminal A7. Some time tomorrow, I'll dig through my harness and see if I can find where the splice is for both. That's the ONLY common link between the 2 other than the ECM, which provides ground to all 4 solenoids to turn them "on" and "off".

 

Well.. I broke out the shop manual and went through the flowcharts for both the EGR and CCP solenoid. I have power at both of them. By having a test light connected to battery, remove the EGR harness and ground the ALDL as if you are pulling codes, and with the key on engine off, probe leads A,B, and C. The test light glowed on all 3 leads as it should because ECM grounds the solenoids on the EGR valve. In the CCP, just disconnect the harness and turn key on engine off and the test light glowed when probed between the 2 leads on the harness as per the shop manual. Seems like I'm getting power to both and the cluster is getting power because the lights and gauges are working ok. Might be a bad EGR, but the CCP is a mystery if its getting power to the solenoid. I'm gonaa do like you suggessted with the 9 volt battery and test the EGR to see if the engine idle changes when the solenoids are grounded.

Ken

 

Do the same with the canister solenoid. You shouldn't be able to blow air through the solenoid with power applied in the proper direction.