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2004 gmc envoy_slt
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56 Posts
Discussion Starter · #1 ·
Hello everyone! :)

1st post here... thanks to everyone for the kickAss community.
I have learned a LOT in the two days I have been here.

There is already a plethora of things pending to do to my vehicle:
'04 Envoy SLT I6

All this was inspired, because of the vehicles here.
Need more love for my car.
:excited: <-- I find this guy hilarious

So off to the auto parts store, bought AC Delco Iridium with PentaCore ExaByte Paramagnetic Chips.

The vehicle has 10 miles to go for the 90,000 mile mark... so let's see what this brings.

1st, the Rite of Passage for these forums:::
The throttle body got cleaned! :woohoo:
Red Auto part Automotive engine part Cylinder


Quick Question for my fellow Trailvoy'ers:
Is there supposed to be a rubber 'weatherstrip' at the top of the firewall?
As marked in this picture?
Land vehicle Vehicle Car Engine Auto part

(( please pay no attention to the st34lth turb0z k1tz ))

The coil packs of cylinders 4 & 5 where.... kinda 'rusty'.
Auto part

Not sure what's up with that :confused:

Here's the cylinder 2 pit/hole/shaft/power-column/fire-charging-location:
Auto part Caramel color Wheel


And cylinder 3's... which is notably more oily:
Circle Auto part Spiral


Uploading more pics soon... :)

-- AJ
.
 

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2004 gmc envoy_slt
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56 Posts
Discussion Starter · #2 ·
When the 1st spark plug was removed, we found pretty much what we found on all other 5 of them.

Here's a shot with the old spark plug in-focus...
Auto part Automotive engine part Spark plug Metal Screw


And another one with the new one in-focus....
Auto part Automotive engine part Spark plug


Yikes! Difference! :woot:

One more for digital-bandwidth's sake:
Metal Auto part Still life photography


In conclusion, the vehicle is MUCH more responsive now.
This was long overdue.

Among the To Do list is:
- New fuel filter
- transmission flush/oil/filter change
- fix the parking brake


I initially came to this site because I was looking for information on removing the dashboard from the Envoy.
The air conditioning system started faltering about 3 days ago.
It would cycle on/off until it 'hooks' the correct pressures, and you're off.

Bad signs.

So this morning a a/c repair guy came by my home and checked it... refilled it, and checked with the funny-pig-noise detector thing.
Sure enough, from the evaporator box, there's a leak.
Crap.

Yet, on the positive note, the air conditioning will ROCK when this is all said and done. The compressor was replaced about 18 months ago.

I'll definitely shoot many pictures of that expedition.

Thanks for the forums! :thumbsup::thumbsup:
 

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2003 chevy trailblazer_ls
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1,708 Posts
Welcome to the site. Did he give you an est. on r&r of the evap? If I remember everything has to come out to get at it. How offten do you need to add 134A to keep it cool?
 

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2004 gmc envoy_slt
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56 Posts
Discussion Starter · #4 ·
Welcome to the site. Did he give you an est. on r&r of the evap? If I remember everything has to come out to get at it. How offten do you need to add 134A to keep it cool?
Hello Robert,

Thanks for the reply and the welcome. :)

He didn't give me an estimate, I was pending his call the rest of the day (today) and it didn't come.
Tomorrow, I'll call him early to see what's up.

A shop I went to yesterday quoted $850, with parts and labor.
I hope that by parts they mean: evaporator, dryer, and expansion valve.
Am I missing something?

Honestly, if the total is over $500, I'll get the parts, do it my self, and ask the guy to come back and fill the system with refrigerant.

The leak is heavy... as in, this morning the guy filled it up with some leak-stop thing, leak-dye, and refrigerant, and already now, 20 hours later, I can sense that it is gone... :crazy:
 

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2003 chevy trailblazer_ls
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1,708 Posts
Sounds like you have a big leak. The parts are cheap but the labor is intensive. The dash and everything below has to come out. I do not think that there is an easy way to get into the box to replace the evap.
 

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2004 gmc envoy_slt
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56 Posts
Discussion Starter · #7 ·
Sounds like you have a big leak. The parts are cheap but the labor is intensive. The dash and everything below has to come out. I do not think that there is an easy way to get into the box to replace the evap.
Yeah... but no hurries... these things seem to follow me.
Did it on my Volvos (two)... on the Grand Cherokee before this Envoy... now this one...

I have quoted on parts:
$255 evaporator
$8 expansion valve
$95 OEM dryer

I think that those parts, a bottle of acid/washer, a bottle of flush, and I should be able to tackle it.

Once it's all back up, I thought of calling the guy, so he pulls a vacuum, makes sure there are no leaks on vacuum/pressure, then... charge away.

That's the plan. :yes:
 

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2003 chevy trailblazer_ls
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1,708 Posts
I would not buy anything until you get it apart. Could be the exp. valve, o ring, etc.
 

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2003 chevy trailblazer_ls
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5,268 Posts
the reason that those 2 coil packs are rusted- is beacause water got to them.
YOu also ask about the weatherstrip....
people here will report missfires...
when they look into it- the spar plug hole is full of water- and the stuff rusted.
So in your case- its apparent that water was making it past the seal.
If you do have one.. I dont have a pic of that area to compare...
But I believe there may be a revised seal part #.
many times with snow- or heavy rain water gets past the hood seal and it makes its way to those spark plugs.
Ive seen 100K spark plugs look way better than yours. (including mine).
Im surprissed how worn yours are.
 

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2004 chevy trailblazer_lt
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997 Posts
Where are you getting your gas? It looks like a lot of sulphur deposits on the plugs. (Not bad considering the mileage, though.)

Many of us in here only burn Top Tier gas. (Google it for more info.) We also throw in a can of Techron or Seafoam in the gas tank with every oil change.

Have you ever had problems with your fuel gauge reading funny? Sulphur deposits in the fuel can accumulate on the printed contacts of the gas gauge sender unit in the tank.

Nice photos, by the way!

And don't worry about a bit of oil pooling in the odd spark plug hole. It's pretty normal on high-mileage vehicles.
 

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2004 gmc envoy_slt
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56 Posts
Discussion Starter · #12 ·
I would not buy anything until you get it apart. Could be the exp. valve, o ring, etc.
Thanks for the diagram.
I will definitely remove everything... it will be a pleasant surprise if it's an o-ring inside or something... although, to be honest, it's kind of too remote to happen.
Let's see :)

the reason that those 2 coil packs are rusted- is beacause water got to them.
many times with snow- or heavy rain water gets past the hood seal and it makes its way to those spark plugs.
Well, we do have the USA's rainforrest here, so heavy amounts of rain is normal.
At least it didn't puddle up and rust everything out.

Ive seen 100K spark plugs look way better than yours. (including mine).
Im surprissed how worn yours are.
I was taken aback too.
No idea what's up with 'em.

:tiphat Welcome :tiphat My Envoy has just the weather stripping that shows in your picture.
Thanks for clearing that up Wooluf!
I had that doubt, yet now I can sleep tight. LoL
:)

Where are you getting your gas? It looks like a lot of sulphur deposits on the plugs. (Not bad considering the mileage, though.)

Many of us in here only burn Top Tier gas. (Google it for more info.) We also throw in a can of Techron or Seafoam in the gas tank with every oil change.
My gas comes from the nearest station.
If it's Shell, or Texaco, Total, Juanito's Under-the-Tree, etc.
I will buy the fuel filter today, change it, and throw one of 'em fuel injector cleaners.


Have you ever had problems with your fuel gauge reading funny? Sulphur deposits in the fuel can accumulate on the printed contacts of the gas gauge sender unit in the tank.
The fuel gauge, no.
She's always acted as she should...
Yet I'll definitely keep an eye out for that.

Nice photos, by the way!

And don't worry about a bit of oil pooling in the odd spark plug hole. It's pretty normal on high-mileage vehicles.
Thanks for the pics!
I was happy the camera decided to snap those close-up pics without fuss.
And cool cool with the bit of oil in the spark plug hole... no major leak then.
w00t w00t!

Thanks for the mega-super welcome to everyone!
This place rocks!!
 
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