Hey everybody... My mother'* Intrigue is acting up, and I've exhausted all ideas on my end to solve the problem, and no dice.
OK, first the background. 204,000 miles, Series II 3800, original motor/tranny, and for its age and mileage, the ol' girl has been VERY good to us.
Recently, sometimes the car would fail to start when cold. When it would start, it would either run perfectly fine, or it would run really rough and the SES lamp would constantly flash.
I disconnected the battery, replaced plugs (one was original - long story), wires, all three coil packs, reconnected the battery, re-calibrated the VATS BS, and the car ran perfectly after that. A few days later, back to the same behavior.
I invested in an OBD-II to USB cord, and with it, got OBDWiz. Pulled the codes, and this is what I got:
- P0141 - O2 Sensor Heater Circuit
- P0300 - Random/Multiple Cylinder Misfire
I reset all codes, car ran excellently, it did its full relearn and all emissions systems passed. I was thrilled, but that was short-lived. The next day, back to the same old crappy running, SES flashing.
- P0304 - Cylinder #4 Misfire
Checked plug, wire, and everything for cylinder #4 looked fine to me. Reset the codes again, performed idle relearn, and we were "right as rain" for a few days.
Now, occasionally, it has the same symptoms of randomly running like... Well, how many different ways can I say CRAP? But now, no codes stored, and SES doesn't flash anymore.
I hate to say it, but I'm leaning towards a flaky ICM or ECM, but since those are costly parts to just swap out for ***** and giggles, I'm not quite ready to throw money at random parts hoping for a solution. Any ideas?
Also, for many years now, the traction control/ABS module has been bad. We have been driving this car for ten years or more without the ABS and Traction Control functioning. Frankly, I don't care for the oversensitivity of the ABS system (under "little old lady" braking, a manhole cover will trigger the ABS and next thing you know, you're coasting through a red light while the brake pedal fights you), and the traction control system is the worst thing to put in a car since I can't tell you how many times I had to disable TC just to get through the snow. I HIGHLY doubt this is related, since we've never had any issue once the TC module went kaput. Not sure if it was even worth mentioning, but why not? LOL
Due to financial constraints, a new car is not in the cards for us. We're also of the mentality that, if it can be fixed, it'* not worth hauling to the scrapyard. This is the 7th GM in the family that we've put over 200K on the clock, and this is the "newest" car we have (I got it off-lease with 27,700 miles in '03). And I have to admit, when she'* running well, she'll STILL blow the doors off of a lot of cars out there. In '04, going through the Catskill mountains with AC on, doing 75-80 on the highway, I got 36 MPG. Not too shabby, eh?
This car still has original head gaskets and intake gaskets. Yes, I know I'm tempting fate - but as far as I can tell, there'* no leakage, so I'm hesitant to rip things apart that don't need it yet. My mother may be very poor at upkeep, but she does check fluids frequently and has never ever beat on a car. We need to get to the bottom of this because we need to get through emissions and renew registration.
Is this the point where I can cuss out the State of CT'* Emissions program? LOL... If you have the MIL on, you automatically fail, regardless of actual tailpipe emissions. And in order to automatically fail for the SES light, you have to pay $20 first.
Talk about a racket...