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2007 SUBURBAN 4WD LTZ

smokymtn65

Well-Known Member
Messages
341
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500
Location
East TN
Thread starter #1
Starting this post for input and ideas. Truck is new to us. 5.3 has a few issues (mostly electrical related) and want feedback on things to look for. any particular maintenance items, upgrades suggested, I have only had an OBDLink for trouble shooting. And I would like to get a more comprehensive scanner now, with this and the Camaro.
 

Will L.

Well-Known Member
Messages
7,684
Likes
6,586
Location
Boulder City Nv
#4
You know I am gonna say a new good TOP post battery and cables if at all questionable.

Put a volt meter to the system to verify the dash gauge.

What issues are you having?

Change the fuel filter right away. People don’t know they exist or something and although the fuel pump you have is better that the older design, still not good against resistance. After the filter, throw a gauge on real quick and verify pump is healthy. A good reference point for the future so you know when it is going down hill.

New brake fluid is cheap and easy.

Lossen belt and wiggle the idler and tensioner pulleys. Ive heard of a few just going bad and never heard a sound on the 5.3. Not usually until over 150,000 miles but free and easy.
 

smokymtn65

Well-Known Member
Messages
341
Likes
500
Location
East TN
Thread starter #5
@Will L. Good info thanks, The rear hatch actuator is bad, bought a new one AC Delco just got it last night, RR door lock not working, Head unit/radio "upgraded" to a POJ aftermarket that does not have out-put for rear entertainment so that needs re-upgraded.
 

smokymtn65

Well-Known Member
Messages
341
Likes
500
Location
East TN
Thread starter #7
Rear hatch lock actuator replaced. Door works now ! It made the most hideous noise when you opened it manually.
Added the additional ground wire from body to alt bracket, the voltmeter is steady now .. hmm
 

Will L.

Well-Known Member
Messages
7,684
Likes
6,586
Location
Boulder City Nv
#8
Rear hatch lock actuator replaced. Door works now ! It made the most hideous noise when you opened it manually.
Added the additional ground wire from body to alt bracket, the voltmeter is steady now .. hmm
What?!? GM with inadequate grounding- why I never heard of such a... c’mon man!

Did you know in hmmwvs and hummers, no frame or body grounds exist? All harness. Frames are bolted joints and body is riveted & epoxy aluminum. SMH.

A ground heavy ground wire the size of positive battery cable from negative battery TOP post to both engine and body. Like a good tool: pricey day one, priceless the rest of the time you own it.
 

WarWagon

Well it hits on 7 of 8...
Messages
8,313
Likes
2,799
Location
AZ
#10
I would get a 4 seasons de-slugger for the AC compressor. Once and awhile you will get a thump on startup, after sitting awhile, from the compressor getting a slug of liquid. Sometimes that thump breaks the belt, rips the tensioner clean off, or/and blows the compressor up.

I go one heat range colder on spark plugs. NGK makes AC Delco spark plugs now. And who won WWII?

At some point the fuel filter became part of the pump and not serviceable.
 

smokymtn65

Well-Known Member
Messages
341
Likes
500
Location
East TN
Thread starter #11
@WarWagon , interesting Looks like a good preventative adder. Wonder if it help from killing the clutch bearing on the 03 Envoy XL 4.2 that has died a couple times. wish there was a replacement clutch for those. It went out on the way home from picking up the new (to me) Burb..
 
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