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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 01-16-2011, 11:59 PM
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03Jailblazer 03Jailblazer is offline
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sparkplug gap question

this is likely a stupid question but do i need to adjust the gap on the little metal thing on the bottom of a sparkplug on a TB? and if so how many MM do i adjust it to? ive always worked on older car (1970 ford f-100, 1976 lincoln continental, 1979 ford ltd, 1957 international 2500) and ive always hired stuff done on the jailblazer but now its time i do my own work. can someone help me out here?
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  #2  
Old 01-17-2011, 12:09 AM
WOOLUF1952 WOOLUF1952 is offline
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If you use the AC Iridium 41-103 (the plug most members will tell you are best for the 4.2 I6) they should come pre-set.

The iridium is very brittle, so if you check the gap, be gentle.

I'm not sure of the gap, but I believe it it 0.045"
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Old 01-17-2011, 12:18 AM
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Quote:
Originally Posted by WOOLUF1952 View Post
If you use the AC Iridium 41-103 (the plug most members will tell you are best for the 4.2 I6) they should come pre-set.

The iridium is very brittle, so if you check the gap, be gentle.

I'm not sure of the gap, but I believe it it 0.045"
i searched for them on o'reillys.com it says the 41-103 is a 0.043mm gap. but damn those are expesive, 6.99 a peice! is their any cheaper options?
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Old 01-17-2011, 10:58 PM
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Quote:
Originally Posted by bore_pig View Post
Just cough up the cash and get the iridium plugs. Many members have had issues with other plugs.
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Old 01-18-2011, 03:09 AM
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Quote:
Originally Posted by 03Jailblazer View Post
i searched for them on o'reillys.com it says the 41-103 is a 0.043mm gap. but damn those are expesive, 6.99 a peice! is their any cheaper options?
$42 for 100,000 miles worth of quality spark plugs is expensive? When we have multiple reports of $5 plugs not working well?!?

A quick calculation shows that you'll be spending over 400 times as much for FUEL ALONE over the next 100,000 miles!

Looking for $1 plugs is truly false economy.

Buy cheap beer before buying cheap plugs, is my advice. You'll take less time to get over regretting the cheap beer.
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  #6  
Old 01-18-2011, 05:29 AM
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Quote:
Originally Posted by the roadie View Post
$42 for 100,000 miles worth of quality spark plugs is expensive? When we have multiple reports of $5 plugs not working well?!?

A quick calculation shows that you'll be spending over 400 times as much for FUEL ALONE over the next 100,000 miles!

Looking for $1 plugs is truly false economy.

Buy cheap beer before buying cheap plugs, is my advice. You'll take less time to get over regretting the cheap beer.

It's just like buying tools, pay for cheap and hope it doesn't snap in half when you need it most or pay a good price for a quality tool you can rely on.
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  #7  
Old 01-18-2011, 07:05 AM
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John02Trailblaz John02Trailblaz is offline
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Quote:
Originally Posted by the roadie View Post
$42 for 100,000 miles worth of quality spark plugs is expensive? When we have multiple reports of $5 plugs not working well?!?

A quick calculation shows that you'll be spending over 400 times as much for FUEL ALONE over the next 100,000 miles!

Looking for $1 plugs is truly false economy.

Buy cheap beer before buying cheap plugs, is my advice. You'll take less time to get over regretting the cheap beer.
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  #8  
Old 01-18-2011, 10:49 AM
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tackk5 tackk5 is offline
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OK here is my 2 cents I researched this for my 2006

Iridium spark plugs are rated for 100,000 miles. Yes you can buy "cheaper" spark plugs but keep in mind that you will have to replace them more often. 1 set at $6 each is less expensive than 2 or 3 sets at an economy price if you factor in time and labor costs, if you break anything, and the cost of extra fuel due to the less economical plugs.

I found that NGK Iridium IX should have a gap of 0.44 (according to NGK) and AC Delco Iridium should have a gap of 0.42 (according to dealer) both for my 2006. You can call the stealer for the same info its free.

Both of these are sold at Auto Zone in my area and are around $6 each.

I would at least consider the experiences of the posts here. Other people have tried different plugs with failed experiences. rough idle, poor fuel economy, and more, then had to buy the "better" plugs...

I bought AC Delco Iridium from autozone.

BTW when you do buy whichever plugs... "check" the gap only. They should already be set to what you need but verify that with a feeler gauge. Be very careful the tip is very fragile!!

Good luck.
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  #9  
Old 01-18-2011, 01:13 PM
sevendj sevendj is offline
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They really need to start making softer gap checkers, eh?

Call me paranoid, but I don't care if it's pre-gapped, I'm still checking it!
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  #10  
Old 01-18-2011, 04:28 PM
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Quote:
Originally Posted by sevendj View Post
They really need to start making softer gap checkers, eh?

Call me paranoid, but I don't care if it's pre-gapped, I'm still checking it!
I have bought a set of plastic feeler gauges in the past. As long as you're gentle with them they won't flatten out or worse, break on you especially if you're using a .040" size.
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