Code 26, Quad Driver Module "A" Fault problem

[90oldsregency3800]

Code 26, Quad Driver Module "A" Fault.. as well as the code 34 for the mass air Flow Sensor..

can Anyone tell me if the Quad Driver Module "A" and the Mass Airflow Sensor are linked in anyway? If it is, I have once again replaced the MAFS, and the car is still having problems.. now the more notable side of the engine misfiring on atleast half the cylinders is going on... or do you think the computer is just shot and I should replace it?

my car is a 1990, Oldsmobile 98 regency...

all the research I have done tells me that the Value for something in the Quad Driver isn't returning the voltage it should be.. now considering the fact that I once again replaced my mass air flow sensor for the second time and the problem is going on.. I am starting to believe that the problem lies somewhere between the mass airflow sensor and the computer..

thinking maybe a wire that's grounding out, or atleast getting intermittent contact.. Maxwedge, I would appreciate any help you can get me.. as this is my only car and I travel 25 miles to work each day on it.. can't afford this right now but hey.. what help I can get from anyone must be a good thing...


Chris

[maxwedge]

Chris, the maf is not controlled by a quad driver on this car. The quad controls high load solenoids, TCC for one. egr solenoid if equipped. Reman mafs are problematic,and you could go thru a few to get one that is ok, also check very carefully the connector and wiring at the maf. How do you know half the cylinders are misfiring, this sounds like an ign problem? There is lots of info on the net about this code, do a search here or googleit.

[90oldsregency3800]

what is the TCC?

also I have done searches on google.. and the only things that I really explained is that "something" connected to the quad driver is either bad, or the computer is bad..

Where are the Quad Drivers anyways? seems' like something has to have just come loose somewhere...

Any idea's?

what all is connected to Quad Driver A?
the internet seems to show more on saturns and crap when I ask this part..


and last but not least.. everything I have found on the internet concerning Quad Driver "A" doesn't seem like it's enough to really tell me what's going on, but I did find a post off a 96' olds on some website about the Quad driver "B" having some problem and half his cylinders were misfireing.. which also feels exactly what my engine is doing..

I realize I am not the most knowledgable man when it comes to my car.. but when it comes into electrical, I think I'll try to get it myself before calling GM up to come take a look....

appreciate the help..

chris

[maxwedge]

The tcc is is the torque convertor clutch. This diagnosis can be one of the toughest on GM obd 1 cars, a comprehensive diagram of the pcm wiring and components is necessary to pin down the affected components in the A driver cicuit, one could be shorted or open setting the code, or the pcm could be bad. If you are not comfortable with tracking down this type of problem or do not have access to the tech info a pro may be called for here. Alldata.com has online manuals with trouble trees to help trace this problem. I believe there is a 1 year subscription for 30.00. Many independents have access to the info thru programs they subscribe to like Mitchell on Demand , maybe you can try a local guy for the info, even if you pay for the tech info, printed off his program. Did you search this site?

[90oldsregency3800]

what all is Connected to Quad Driver A?

[maxwedge]

That is where a comprehensive wiring diagram is required, as I said.

[Mickey#1]

Transmission solenoids & canister purge solenoid are some more suspects. I don't know which are operated by A & which are operated by the B quad drivers. See how much resistance these items have.

[90oldsregency3800]

Okay, I know it's not the mass air flow sensor. and I know it's not the EGR solenoids...

though a new symptom as popped up.. when I drive the car and go from dead stop to mashing the gas pedal, I can hear a fairly loud random popping from under the hood.. but it does not do this when the car is in park..

can't hear any vaccuum leaks... could the timing chain have slipped?

or could the Catalytic Converter cause all these problems.. this afternoon I ran the engine to operating temp, and then shut off the car and got underneath and looked for anything suspicious. I didn't really notice anything unusual except for the the smoky steam like stuff coming off a good portion of the exaust pipe... any idea's?

the TCC solenoid is still a suspect I guess.. and the canister purge solenoid works.. could the TCC really cause all this?

and I wish someone could tell me everything I need to know about the Quad Driver,

chris

[maxwedge]

More than likely the driveability symptoms are not related, again until someone looks at what quad driver A controls, you will not really know.