Hey all, long time lurker, first time poster. This is my '03 Envoy SLT 4.2 w/3.73 rear end that I got last year from my uncle's estate when he passed away. It had 114,000 miles when I got it, now with 121,000. She's all stock except for removal of that hideous "baby coffin" resonator (had a muffler shop just weld on a piece of pipe with some subtle bends to keep it tucked-up about even with the lower edge contour of the bumper). It's mostly a weekend grocery getter and frequent 200-mile freeway round trips to see family which is where this vehicle really shines - set the cruise at 80, put on some tunes, and this is one of the best freeway flyers I've ever owned. It was garage kept and well maintained, but some components are at high time.
What's been done so far:
- Set of 4 Goodyear Forteras, stock size.
- Serpentine belt; water pump, thermostat done about a year before I got it; idler pulley still good; old belt, 3/8" ratchet and pipe stowed in rear floor storage.
- Blower motor control module (fan stopped working, tested for 12V in and out, and that was the problem).
- AC compressor with new ACDelco unit (clutch took a dump).
- Power steering fluid cooler (stock one rusted out, replaced with the Dorman aluminim unit).
- Bilstein 4600 rear shocks, Moog sway bar links. All the bushings are still in really good shape, so not messing with anything else back there until I need to.
- ACDelco "Professional" ready struts, ACDelco sway bar links, 4-wheel alignment. I was going to rebuild the assembly with my springs and new Bilstein 4600s, but those struts were on back-order everywhere; and I couldn't take the oceanliner body roll and rattle from the sway bar links. So I kept my original assemblies and will rebuild with the BIlsteins at a later date. Right now I'm quite happy with the ACDelco ready struts as the vehicle rides 100% better, and with the new links there are no more rattles. Tie rods, ball joints still good.
- COILS AND PLUGS - Started it yesterday to go grocery shopping with the Mrs., and while idling the RPMs dropped, almost stalling, then perked back up to the usual +/- 650 rpm (it's done that a few times before intermittently over the last year). Happened again and then stalled. Re-started but only now running on 5 cylinders. Drove it about a mile to see if I would get a light, and I got the flashing Check Engine. I don't have a scanner and don't want to drive it somewhere to have it scanned, so I just pulled plugs and found #4 wet and fouled - I'm willing to bet that if scanned I'd get some kind of 0300 code. I'm going with the NGK 6-pack of coils for $260 at Rockauto and the ACDelco iridiums.
- Rotors, pads, complete fluid bleed
- Drain/replace tranny fluid and filer
- Drain/replace rear end gear oil
- CHIP TUNE! That GM TMS drives me crazy! And hopefully, they can do something about part-throttle/closed loop shift points, too.