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Billyboy
Unregistered
4/13/2001
21:50:49
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 Subject: 3923's question
IP: Logged
Message:
I just bought a 2001 QC with the 4.7 and was reading some of the posts about switching to the 3923's, which is a cooler plug. My question is does anyone know if switching to a cooler plug can lead to any problems down the road (50,000+ miles?) Also, what are the major advantages to switching to the cooler plug besides to stop the pinging?
Any info greatly appreciated
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RonW
*GenIII*
4/13/2001
22:03:20
| RE: 3923's question
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Message:
That's it, stopping the pinging. Since you have the 4.7 I would go with Bosch platinums, 4417's which are one step colder also. People have been having luck with the platinums on the 4.7's.
Ron
00 PB SLT QC 4X2 5.9 46RE 3.92 LSD
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Wayne
GenIII
4/14/2001
09:02:10
| RE: 3923's question
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Message:
From my old hot rodder days, I was taught that the factory suggested plug heat range is for general all around driving. If your granny drives it all the time at slow speeds then you should go 1 heat range hotter. If a lead foot drives it, use 1 heat range colder. Most of the people that are on this forum are lead foot drivers. It also helps the pinging problem IF you have that problem. According to tne TSB most pinging is caused by the spark plug wires and the position to each other. I don't see how a heat range change could cure that problem. Changing heat ranges on your plugs by only one range cannot harm an engine.
Wayne Van Metre
'99 CC SLT 5.2/auto/3.90 anti spin
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matt
Mechanic
4/14/2001
09:43:15
| RE: 3923's question
IP: Logged
Message:
wayne a 4.7l does not have spark plug wires.
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Dan Gruber
GenIII
4/14/2001
10:19:12
| RE: 3923's question
IP: Logged
Message:
While on the subject of cooler plugs...
I don't know a lot about ignition systems. I understand that cooler plugs will help pinging, but my concern is this: wouldn't they also potentially increase emissions (by not being hot enough to burn the entire fuel/air mixture), decrease gas mileage (same reason), increase the likelyhood of carbon deposits (by leaving unburned fuel in the cylinder), and decrease power (same reason)? I have the pinging problem too, but just use mid-grade gas. I'd prefer to use regular because it's what DC recommends and because it's cheaper, but I hate hearing the ping and I have the emissions/fuel economy/carbon/power concerns listed above.
Dan
2000 CC/SLTplus/4X4/4.7/auto/3.55LSD
Gibson cat-back/Airaid
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Wayne
GenIII
4/14/2001
10:21:57
| RE: 3923's question
IP: Logged
Message:
Matt,
How does the electricity get to the spark plugs? It does have spark plugs don't it? I'm 52 today and all this new fangled stuff is messin' wif' my head.
Billyboy,
Don't rearrange your spark plug wires yet 'cause it ain't got none. Hehehe
Wayne Van Metre
'99 CC SLT 5.2/auto/3.90 anti spin
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Wayne
GenIII
4/14/2001
10:46:55
| RE: 3923's question
IP: Logged
Message:
Dan,
In extreme changes in heat range, you may be right. In small changes, we are simply fine tuning and what you speak of will not be noticable. Although I have no proof, years of experience has taught me that carbon deposits are not a problem. Changes in mpg would have to be measured with instruments. Any change would be too small for the miles/gallon method to work. Hp measurements have been reported at 3-4 hp increase.
Wayne Van Metre
'99 CC SLT 5.2/auto/3.90 anti spin
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RonW
*GenIII*
4/14/2001
11:32:21
| RE: 3923's question
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Message:
Wayne is absolutely right about heat range differences. They're too small to make the differences in emissions but will slightly change the heat in the cylinder enough to stop detonation (pinging) which, out of everything else discussed here, is extremely harmful to the engine and will shorten its life.
As to the plug wires on a 4.7 (LOL), it's a coil over plug design that's distributor-less. Primary wires go to each coil which sits on the plugs themselves. These primary wires are like the primary wire going to your coil. It carries 12 volts, that's it. Not like the 28K-42K volts that spak plug wires carry.
Ron
00 PB SLT QC 4X2 5.9 46RE 3.92 LSD
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Wayne
GenIII
4/14/2001
11:50:40
| RE: 3923's question
IP: Logged
Message:
Hey! A spark plug cap that is a coil! I got to get me one of them. Dang! I can remember when the 5.2 was a 318 and it was the highest tech. I'm getting old. I gotta' go buy me some Depends.
Wayne Van Metre
'99 CC SLT 5.2/auto/3.90 anti spin
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matt
Mechanic
4/14/2001
17:04:11
| RE: 3923's question
IP: Logged
Message:
wayne the 4.7l has a single coil right on top of the plug. the coil is fired directly by the pcm. it does not have sark plug wires it does have little 12 or 10 gauge wire running toeach plug. the engine is pretty high tek. If you want to here a better one this truck with the 4.7l does not even have a throttle cable.
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Wayne
GenIII
4/14/2001
17:19:11
| RE: 3923's question
IP: Logged
Message:
Hey, man! Fly by wire....just like the F-16. Cool! Next thing you know they are going to be putting HUD in these dang things.
Can any of that be retro fitted on to my 5.2?
Wayne Van Metre
'99 CC SLT 5.2/auto/3.90 anti spin
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95DakotaV8
*GenII*
4/15/2001
06:24:28
| RE: 3923's question
IP: Logged
Message:
Cadillac Sedan DeVille's have a HUD, they have a less complex version of a FLIR behind the grill which will display an image in front of the driver.
Kevin Rants
95 CC SLT 4x4, 5.2L, 5spd
Family Man!
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Wayne
GenIII
4/15/2001
07:28:24
| RE: 3923's question
IP: Logged
Message:
I can see it now......we could put some rocket pods on the roof for those road rage situations. Wow! My old lady would clean off the highways on those PMS days.
Wayne Van Metre
'99 CC SLT 5.2/auto/3.90 anti spin
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