What did you do to your GMT today? [Part II]

[Mike534x]

Welp my headlight washer pump stop working! I can see the nozzle pop out but no spurting. That probably means the relay and PCM is good, either the nozzle clogged or pump died. I always use orange Rain X washer fluid but on the 9-7x I went cheap and put in supertech washer fluid. Hope that's not what's cause the issue

More then likely the pump is dead, I'd get someone to hit the switch and feel if the pump sounds or feels like it's even doing anything. My vote is on it failing, they're fairly cheap so I'd just replace the whole set and not worry about it.

 

[Mooseman]

Actually, they pop out under the pressure from the pump so it probably is still working but the nozzles are clogged.

I disabled mine on the 9-7x at the time as it worked automatically every 3-4 times you used the windshield washer. No way to do it manually. Very annoying and wasteful of fluid so I pulled the relay. Never missed it.

I knew the TBs had a separate button for them, did not know about Envoys although I had noticed them in yards.

 

[azswiss]

Following up on my previous post regarding the trans slipping I did some basic checking and found the following:
- No codes
- Trans fluid level and color were OK, no burnt smell
- Drained the trans (thankfully the pan has a plug); no chunks but small amounts of fine glitter
- Topped off the fluid (~3.5 Qts) and took it for a test drive along the same route as previously
- No slippage (note: only went to 75% of WOT)
- Trans temp steady at 185F
- Shift times: 1-2=>.2/.3 sec 2-3 = .3/.6 sec 3-4 =>.6/1.2 sec

Even though there was no slippage *this time*, given the presence of (albeit small amounts of fine) glitter and the noticeably higher 3-4 shift time my interpretation is that the trans is putting me on notice.

Will continue to monitor for now while taking it easy and using only locally.

 

[Mike534x]

Actually, they pop out under the pressure from the pump so it probably is still working but the nozzles are clogged.

I disabled mine on the 9-7x at the time as it worked automatically every 3-4 times you used the windshield washer. No way to do it manually. Very annoying and wasteful of fluid so I pulled the relay. Never missed it.

I knew the TBs had a separate button for them, did not know about Envoys although I had noticed them in yards.

My Envoy has a dedicated button for it, the Trailblazer doesn't. I believe the TB North Face had a dedicated button similar to the Envoy's however. But that's good to know! I've yet to see the Saabs interior in person to get a feel for its setup. Learn something new everyday, I had no idea the nozzles popped out when activated.

Made progress on the Envoy, and I may be passed the worst case scenario. Found a YouTube video, where a guy held a dollar bill to the exhaust pipe, if it tries to suck it in then the valve is bad, if it doesn't then the valve is good. It passed the dollar test. So I retraced my steps from the very beginning. Re-inspected the new plug, the gap is still good. Swapped out the wire with a new one, and put the old coil back in. No change. Noticed the fuel injector on #2 was louder then the others. Gently pulled up the fuel rail, and grabbed the "cleanest" of the old injectors and threw it in. Loaded up the "Tech 2" and started watching the misfire counts. None on #2 so far, then #7 starts to show a count or two. So I technically have 7 "new:" fuel injectors, the one I installed on #2 was....the reman GMB I grabbed from RA. So before I take the rail off again, I figured why not swap the wire on #7, as suspected, the misfire left #7 and moved to #6.

So my misfire on #2 was caused by all 3 components. Bad plug, wire, and injector. Idle wise, shes sounding much happier/less rough. After swapping #7's wire, I ran her for 2k RPM for 5 minutes and thats when #6 started showing one or two counts. I believe the other issues are bad wires. I believe the first ones I received from Amazon were counterfeit AC Delcos, when I hold each one, the "bad" one definitely feels more flimsy compared to the other "ACD" wires I received the day before from Amazon. Going to change the other rest tomorrow, and monitor the misfire counts again. But I'm breathing a sigh of a relief....for now....


Also, some random info that may be helpful.

The AC Delco 41-110's were superseded by the 41-162's for most of the V8s to current it looks like, from various forums I've looked at Denso seems to be the new OEM supplier for AC Delco spark plugs. So it looks like those are the next best thing OEM wire to use on our platform.

 

[flyboy2610]

There seem to be an awful lot of counterfeit auto parts on the big river site these days. I'm sure Mr. Bezos is well aware of the issue, but he doesn't seem to care enough to do anything about it. Rant over.

 

[Zaab]

Actually, they pop out under the pressure from the pump so it probably is still working but the nozzles are clogged.

I disabled mine on the 9-7x at the time as it worked automatically every 3-4 times you used the windshield washer. No way to do it manually. Very annoying and wasteful of fluid so I pulled the relay. Never missed it.

I knew the TBs had a separate button for them, did not know about Envoys although I had noticed them in yards.

Well I was able to pull the headlamp asssembly, having assessed to the washer and then pull the nozzle out remove safety pin.
Boom! Hot washer fluid gushing out uncontrollably. I now have to ring the damage control party. Damage control party cut the power to headlamp washer pump, no effect. DCP concluded that the system may be in open and being gravitational drained, use a rubber glove to plug the washer. No effect. Garage start flooding. DCT proceed to bring a bucket under. Flood controlled but entire reservoir of washer fluid lost.

 

[Zaab]

Actually, they pop out under the pressure from the pump so it probably is still working but the nozzles are clogged.

I disabled mine on the 9-7x at the time as it worked automatically every 3-4 times you used the windshield washer. No way to do it manually. Very annoying and wasteful of fluid so I pulled the relay. Never missed it.

I knew the TBs had a separate button for them, did not know about Envoys although I had noticed them in yards.

Pretty much nailed the suspect at faulty nozzle. Pump always has the pressure and shot me a full face of water. When I wash the nozzle, spray on one exit would cause water coming out from aside, means the end part of nozzle is good. It’s just where it regulat pressure to extend the nozzle as well as spraying died.
Not affecting daily drive so just let it go~

On the other hand, learnt how to get headlamp assembly off and change bulbs, so still a fruitful time spent this afternoon.

 

[Mike534x]

There seem to be an awful lot of counterfeit auto parts on the big river site these days. I'm sure Mr. Bezos is well aware of the issue, but he doesn't seem to care enough to do anything about it. Rant over.

Its definitely becoming more common unfortunately. I was hesitant ordering them a second time, but thankfully those seemed legit. Same thing happened with the spark plugs for the Trailblazer, I've reached the point where anything part related I'll just get from RA, or Summit Racing. The part stores have been getting a little better with price matching, so I may stay open minded about them.

Drove the Envoy around earlier to do some errands, the spark plug heat shields didn't come in. But so far so good. No current misfires when driving around with the "Tech 2" open, and the idle is holding fully steady and can now barely be felt running when at idle. Still going to swap the remaining wires though when I get the chance. This whole experience has had me eyeing an ICON scanner from Harbor Freight. After watching Eric O from SM use his, it seems like a pretty solid tool.

 

[Mike534x]

Took her for a drive this morning, came to a crawl in traffic on the highway as I'm inching forward I feel the dreaded shudder. Oh boy....misfiring, but not setting a code off but Torque was reporting #2, 5, and 6 with counts. After managing to turn around and head home, I left her sitting for a few hours and climbed under the hood and yanked each wire and plug. #2 reeked of gas, and the plug confirmed it. So that reman injector was definitely sending too much into that cylinder. Here's where it gets interesting, plugs from 4 and 6 were loose, those were snug originally. #5, 7 and 8 were ok though. I had 8x ACD Iridium 41-110s sitting in my tool box unused in their box, so I figured might as well toss the OEM ones back in and see if that changes anything. Comparing the threads, the NGKs were ever so slightly more spaced out. So I'm guessing the plugs came loose from the expansion of the block warming up and cooling off.

Threw them in, and left her running for 20 minutes and she was back to idling smoothly again. Still not seeing a misfire count, but I plan on taking another ride on the highway tomorrow with the scanner open to keep an eye on it. I did end up changing the oil to be on the safe side, and it definitely smelled more of gas then it usually does.

Will post back about this crazy misadventure.

 

[Zaab]

Getting the $$$ Bilstein. Aside from being very good shock, they are also good at making your wallet lose weight!

Almost kill the air bag by accidentally drop the axial, but it is done.
Now the rear feels like a bimmer x3 lol

 

[Mooseman]

Getting the $$$ Bilstein. Aside from being very good shock, they are also good at making your wallet lose weight!

Tell me about it. I spent over $500 just on a pair of struts for the Sierra but it was well worth it.

On the TB, the windshield washers were barely squirting anything . First thought it was empty but refilling didn't help. Disconnected the hose near the container and the pump is working fine so the nozzles are plugged. With the hose still disconnected, I put some compressed air to them but I forgot to take off the one way valved so I blew apart the aftermarket nozzle on the passenger side. Had to unbolt and get under the cowl cover to grab the hose, add some instant glue and put it back together. Now she's squirting good again.

Then on the Sierra, the ScanGauge II that I was using to monitor things like soot load %, Regen status, oil and trans temps went wonky and was rebooting and freezing every few seconds. I had tried contacting their support but only told me to try some of the other X-Gauge programming, which didn't help. Some of the other X-Gauges were showing some funky symbols so figured it was borked. Instead of buying a whole new unit, I found out that when getting an update for them, you simply replace the board inside with the new one they send you with the latest version. Voilà! A new SGII for only $45 instead of $190. Just had to program in the X-Gauges for the GM diesel specific stuff. I`ll do a write up on this as they don`t list specific PIDS for the 3.0L diesel.

I am considering getting a ScanGauge III. A much better unit that can display up to 9 PIDS instead of 4 on the SGII. And it`s only $350CAD instead of the insane $419USD ($580CAD) for the Banks iDash Pro which only displays 7.

 

[Zaab]

Tell me about it. I spent over $500 just on a pair of struts for the Sierra but it was well worth it.

Woah! Is it specifically designed for offroad/towing?

On the TB, the windshield washers were barely squirting anything . First thought it was empty but refilling didn't help. Disconnected the hose near the container and the pump is working fine so the nozzles are plugged. With the hose still disconnected, I put some compressed air to them but I forgot to take off the one way valved so I blew apart the aftermarket nozzle on the passenger side. Had to unbolt and get under the cowl cover to grab the hose, add some instant glue and put it back together. Now she's squirting good again.

Nice. My drive side doesn't spirt as well as passenger side, I need some compressed air treatment as well.

 

[Mooseman]

Woah! Is it specifically designed for offroad/towing?

It`s the adjustable 5100 series. Needed better rebound control and wanted to level the truck.

B8 5100 0-2.5" Ride Height Adj Front (24-337052) 4wd - Bilstein Canada

Bilstein B8 5100 (Ride Height Adjustable) shock absorbers are designed for trucks and SUVs with a front OE coilover style suspension. Multiple snap-ring grooves in the body allow for different spring seat positions, providing 0-2.75 inches of front lift with OE springs (depending on...

bilsteincanada.com

Post in thread 'What did you do to your GMT today? [Part II]'

Jun 28, 2025

I saw it's a V8, please tell me it's not the 6.2! The 5.3 is safe.

Project Sierra suspension upgrade complete. Just installed the Bilsteins in front and at the second top most clip position, she's level. The job itself wasn't too bad except that the top bolts on the struts weren't accessible from the top because of stuff in the way except for the innermost one on the right side. All the others I had to remove with a wrench from the wheel wells. To get the suspension to droop down enough I had to unbolt the sway bar link from the lower control arm, and then I still had to use a pry...

• Mooseman

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[azswiss]

Swapped out the shift & TCC solenoids in the transmission. The pan looked good; some magnetic gunk on the magnet but not a lot. Was able to extract the 1-2 & 2-3 shift valves and they were clean and moved easily in their bores. Have to say, working in this heat is a challenge. Got off to a late start yesterday doing all the prep work (drop the exhaust, ready the pan for removal), by the time I called it quits it was already 106F outside. Started off much earlier today, by the time I had the solenoids installed and the pan back in place and torqued it was already 107F (on the way to 114F) so I called it quits again and then flopped into the pool. Whew! Will finish tomorrow.