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Old 06-24-2010, 09:39 PM   #1
s4bill
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Default spark plug wires

I have 135k miles on 02 impreza outback sport.

I didnt buy the car new but i question whether the plug wires have been replaced.

i have read different theories on this. Some say replace every x number of miles. Some say dont replace unless they fail.

I dont see any visual damage to the wires. I put an ohmmeter to each of the wires for reading.

The 2 wires on the driver side both read around 9K
The 2 wires on the passenger side were a bit different, one read 7K and the other wire read 14K (it was higher at first but I think that was how I was holding the leads to the ohhmmeter - not sure)

Is this normal or is than an indicator that I should be looking at new wires?
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Old 06-24-2010, 10:00 PM   #2
dstan
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I think it deserves new plug wires with the miles it has, they are cheap so why not?
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Old 06-24-2010, 11:49 PM   #3
piker28
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I usually say with used cars, anything that can be changed should be changed.
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Old 06-25-2010, 03:09 AM   #4
feint05
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i have the same question, looking for a more technical answer
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Old 06-25-2010, 09:34 AM   #5
Jessekrs123
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Get new wires. There is no need to use an ohmeter to test them. They are very cheap and easy to replace. Be safe, just get new ones so you know that they are new instead of wasting your time and using guesswork to figure out how old they might be.
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Old 06-25-2010, 12:10 PM   #6
s4bill
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Default does the brand of wires make a difference

This is a stock every day driver.

The wires range a little in price and there are several different manufacturers.

Autolite is one that is common.

Does it matter? Is there a preference with the wires?

I understand that I already made a mistake by putting Bosch Platinum+2 plugs in it?
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Old 06-25-2010, 01:00 PM   #7
Jessekrs123
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^^ I do not believe that you should worry about what type of wires you get if it's just a daily driver. The spark plugs are alright too as long as they are gapped to spec. There is no need for super expensive high quality wires and plugs if it's just a commuter.
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Old 06-25-2010, 03:40 PM   #8
s4bill
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The Bosch platinum +2 plugs are designed in a way that you cant or are not to gap them.

I am not sure if that is a good or bad thing.

I bought them because they had a rebate. I am thinking I should have just bought the NGK.

Anyway, unless I find that they are bad or there is a reason not to use them, I think I will drive them for 30K and replace them.
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Old 06-25-2010, 03:53 PM   #9
o'doyle
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Rallitek Wires:

Just put these on my '04. Work great, look sweet in blue

I went with the BKR5EIX-11 Iridium IX plugs from NGK. No hiccups yet, I expect they'll be great.
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Old 06-25-2010, 06:31 PM   #10
feint05
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ralliteks are sweet, however for my 1998 spark plug wires are year specific and after owning ****ty wires both kragen and autozone on my old car, i will not buy anything other than ngk or bosch wires which are at least $60
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Old 06-27-2010, 11:30 AM   #11
indytruckboy
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if you look in the service manual, they will tell you the specific ohm reading for each individual wire.

this is for my 07OBW but goes as:
Specified resistance:
#1 cord: 7.1 — 12.1 k��
#2 cord: 12.1 — 19.9 k��
#3 cord: 7.7 — 13.0 k��
#4 cord: 12.3 — 20.2 k��
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Old 06-28-2010, 03:58 PM   #12
s4bill
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Quote:
Originally Posted by indytruckboy View Post
if you look in the service manual, they will tell you the specific ohm reading for each individual wire.

this is for my 07OBW but goes as:
Specified resistance:
#1 cord: 7.1 12.1 k��
#2 cord: 12.1 19.9 k��
#3 cord: 7.7 13.0 k��
#4 cord: 12.3 20.2 k��
why is the resistance differnt amoung the wire?
is it based on length?

I didnt think the wires were that different???
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Old 10-12-2010, 10:18 AM   #13
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i just put in new NKG spark plug and wires and i pulled the wires off one by one and matched the length of the old wire to the new wire and after i was done and every thing was back on i notice that the wires on the left were the same length and the ones on the right were of the same length also.. and i kinda got worried not sure if i did it wrong or not. i own a 97 subaru impreza 2door. I'm i fine with the way i did it or do i need to move the wires around
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Old 10-12-2010, 10:55 AM   #14
RaineMan
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I would think that the wires will be fine as long as the fit.
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Old 10-12-2010, 05:45 PM   #15
bheinz57
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Change the plug wires. I just did in my MY02 OBS last month. Nicer idle now. I went with NGK blue ones made for the car. Got them on online cheap.

Brian
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Old 10-12-2010, 05:59 PM   #16
EdHilario
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I've been using NGK wires and plugs since I've owned my car. Read & been told that the Bosch stuff doesn't play nice with our cars but I can't recall why (if it's even true).
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Old 10-12-2010, 06:54 PM   #17
sunnyx
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the spark plugs i pulled out were bosch platinums got worried cause ive never seen spark plugs with two prongs on it
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Old 10-13-2010, 12:57 PM   #18
EdHilario
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I've got the NGK Platinums in my car right now. Had the coppers prior to it just to try them out. Pretty good for the price.
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Old 10-13-2010, 01:07 PM   #19
RaineMan
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Quote:
Originally Posted by sunnyx View Post
the spark plugs i pulled out were bosch platinums got worried cause ive never seen spark plugs with two prongs on it
No need to worry... they work just fine. The really high-end ones have 4 prongs.

For the 2.5, there is no need to drop big money on fancy-schmancy plugs. NGK coppers will do just fine. Gap them correctly and don't worry about it.
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Old 10-13-2010, 06:09 PM   #20
sunnyx
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i never gaped my plugs is that bad? and how do i gap them
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Old 10-14-2010, 04:09 AM   #21
EdHilario
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Buy a spark plug gapping tool or gauge
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Old 10-14-2010, 05:30 PM   #22
sunnyx
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i've check my owners manual and it doesnt say anything about what gap sizes the spark plugs need to be any one know where i could go to find out
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Old 10-14-2010, 06:17 PM   #23
RaceFaceXC
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Quote:
Originally Posted by sunnyx View Post
i've check my owners manual and it doesnt say anything about what gap sizes the spark plugs need to be any one know where i could go to find out
FSM is the best place but probably not something you can get your hands on easily. What engine and what year? Im sure someone here knows what plug/gap should be. Does the owners manual give a spark plug part number? often, the plug part number will be specific to a pre-gapped plug. this is the case for the 05+ EJ253's.
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Old 10-14-2010, 06:21 PM   #24
sunnyx
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its an ej22 in a 97 impreza the plugs were NKg-6011? i think, i hope they are pre gapped but i hope me changing the plugs n wires aren't the cause to why it feels like my engine bogs down if i WOT my car
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