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4.2 Spark Plug options

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Old 06-17-2014, 06:46 AM   #1
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Default 4.2 Spark Plug options

Been told alot to get alot of different types/brands of spark plugs. My Audi mechanic recommended the NGK IX Iridium spark plugs from Autozone. Said these are much better then OEM NGK spark plugs. http://www.autozone.com/autozone/par...er=505324_0_0_

Should i be going platinum? i take it that Iridium is better?
What do you guys think?
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Old 06-17-2014, 09:04 AM   #2
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Quote:
Originally Posted by AFrancis View Post
Been told alot to get alot of different types/brands of spark plugs. My Audi mechanic recommended the NGK IX Iridium spark plugs from Autozone. Said these are much better then OEM NGK spark plugs. http://www.autozone.com/autozone/par...er=505324_0_0_

Should i be going platinum? i take it that Iridium is better?
What do you guys think?
I went with the OEM NGK plugs and seem to be fine. I might go Iridium next time, since I have run them in my other vehicles. To be honest I've never noticed an enormous difference when going from one type of plug to another...unless you get stuck with a dud, but I've always either purchased OEM or higher perf plugs.
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Old 06-17-2014, 10:28 AM   #3
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I went with the OEM NGK plugs and seem to be fine. I might go Iridium next time, since I have run them in my other vehicles. To be honest I've never noticed an enormous difference when going from one type of plug to another...unless you get stuck with a dud, but I've always either purchased OEM or higher perf plugs.
Thats what im looking for, higher perf pulgs, since im sure the OEM are out dated since its a 8+year old car.

Have you replaced your spark plugs before? if so, what did you do for your gap with the plugs, did you go 0.32, since we both have 4.2s. when i read the 55k service forum it didnt mention the 4.2. Im thinking its a smaller gap like 0.30.
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Old 06-17-2014, 04:50 PM   #4
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Thats what im looking for, higher perf pulgs, since im sure the OEM are out dated since its a 8+year old car.

Have you replaced your spark plugs before? if so, what did you do for your gap with the plugs, did you go 0.32, since we both have 4.2s. when i read the 55k service forum it didnt mention the 4.2. Im thinking its a smaller gap like 0.30.
My plugs are pre-gaped for the appropriate engine, so there's no need to change the gap. I'm sure someone here has the Bentley page pdf who can post the particular gap, but I believe for the 4.2 it's .040

BTW, here are the one's I installed in my car: http://www.oreillyauto.com/site/c/de...3435&ppt=C0334
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Old 06-18-2014, 04:43 AM   #5
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My plugs are pre-gaped for the appropriate engine, so there's no need to change the gap. I'm sure someone here has the Bentley page pdf who can post the particular gap, but I believe for the 4.2 it's .040

BTW, here are the one's I installed in my car: http://www.oreillyauto.com/site/c/de...3435&ppt=C0334
See you say no need to change the gap, but from the NGK website and everyone i hear/read from says the pre gap is off by alot and that it MUST be regapped. that plug you showed me the laser platinum is pre gapped at .44 when ive read that it needs to be arond .30-.34. for the 4.2 engines, so i dont know who to believe really. So i need to find out more.

and nice on the orileys link, found these http://www.oreillyauto.com/site/c/de...3435&ppt=C0334 for $9.99. theyre like $14+ everywhere else. Most state of the art right now.
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Old 03-14-2015, 12:12 PM   #6
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whats the correct gap for the 4.2?
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Old 03-16-2015, 10:59 AM   #7
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I just put in some NGK BKR6EQUA plugs. These have the 4 ground electrode, no gapping required.
2005 4.2

Last edited by 69RS; 03-16-2015 at 11:56 AM.
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Old 03-16-2015, 11:16 AM   #8
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whats the correct gap for the 4.2?
Here's info for the 3.2 specific to Spark Plug Data

Engine code BKH/CALA

Spark plugs

VW/Audi 101 905 600

Manufacturers designation PZFR5J

Electrode gap 1.0 to 1.1 mm

Tightening torque 30 Nm
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Old 03-20-2015, 10:13 AM   #9
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Any one tried Autolite Iridium spark plugs? autozone has them on sale for $1.99 a piece after rebate!!

Autolite XP Iridium/Spark Plug XP3923 at AutoZone.com - 4 reviews
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Old 03-23-2015, 08:32 AM   #10
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.036, got oem ngks in audi boxes from ecs tuning
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Old 03-25-2015, 02:53 PM   #11
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I would stay away from the Autolites..do you really want a $1.99 spark plug in your Audi? I wouldn't..my recommendation as well as many others would be to stick with what came in your car from the factory. I have read that Many engineers build engines around spark plugs and the factory puts them in there for a reason.
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Old 03-25-2015, 04:33 PM   #12
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To best answer, consider if the engine is PFI or FSI and how often you wish to change the plugs.
On my VH45DE engines (PFI) I have run both NGK iridium and NGK 2x plats. It came from the factory with the 2x plats just like our Audis do.
But those are PFI.
FSI can be very hard on the copper electrode, and the iriduims are only iridium on the center electrode, (they are copper on the grounding electrode). If you can find a 2x iridium, then i suppose that would be the bomb.
meth seems to favor iridium.....
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Old 03-25-2015, 04:33 PM
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