ECM question....Buick V6, but non-TR related,

[Black Box]

Anyone know what "Quad Driver #1" does in an ECM and what it controls? I got an SES light, code 26 from my Oldsmobile. Car has a nasty stumble at cruising speed and a misfire at idle, but the stumble goes away when the throttle is depressed more than 1/4 way. TPS is new, Cam Sensor & timing chain are new, O2 sensor, ign. wires and spark plugs are relatively new but the car had the problem before they were all replaced.
Once I got the code 26, I figured the ECM was dead, so I replaced it, but the problem is still there. Tried asking on www.lesabret.com but I haven't gotten a response as to what QD#1 controls. Has to be some kind of relay or solenoid, according to the diagnostic manual I was looking at.
Any ECM gurus here know about this?

Thanks much,
Steve

 

[trbo668bird]

Anytime that I've seen that code it has been either the EGR solenoid or the canister purge solenoid, most likely the EGR solenoid, I doubt your car would have a purge solenoid.

 

[salvageV6]

Try my coil pack on it.

 

[Black Box]

Thanks bird. I'll give that a shot. Believe it or not I think it does have the purge solenoid, but that's probably pretty cheap so I may just do 'em both.

This afternoon when I was driving to my nite job the car was doing it's usual stumbling, then all of the sudden it felt like it lost a cylinder, ran real rough and lost all kinds of power.

salvage why don't you just PM or e-mail me your address so I can UPS it to you. Thing has been sitting in my living room on my new car parts pile (love that bachelor life ) for over a year now.

Thanks
Steve

 

[salvageV6]

I can do that.

Don't know a thing about the Oldsmobubble.

Check the wiring on the connectors to those solenoids as well, open or shorted wiring can cause codes too, even if the solenoid is good.

 

[Black Box]

Gotta check that first. Damn EGR solenoid lists at $272!!
Maybe I'll try the purge canister first, it's only $13..

Thanks to both of ya.

Steve