When to change spark plugs on RX330?
Thread Starter
Rookie
Joined: May 2004
Posts: 70
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From: Georgia
When to change spark plugs on RX330?
Does anyone know when to change Iridium spark plugs on RX330?
It has about 40K and engine idling sound somewhat rough to me (idling at 700K RPM).
Also, do I really need to adjust drive shaft bolt? It’s recommended on owner’s manual and I don’t know what that is or how to torque in factory spec.
I really like to learn and I’ve all proper tools including torque wrench.
It has about 40K and engine idling sound somewhat rough to me (idling at 700K RPM).
Also, do I really need to adjust drive shaft bolt? It’s recommended on owner’s manual and I don’t know what that is or how to torque in factory spec.
I really like to learn and I’ve all proper tools including torque wrench.
CL Community Team
Joined: Apr 2004
Posts: 17,337
Likes: 213
From: Miami, Florida
Does anyone know when to change Iridium spark plugs on RX330?
It has about 40K and engine idling sound somewhat rough to me (idling at 700K RPM).
Also, do I really need to adjust drive shaft bolt? It’s recommended on owner’s manual and I don’t know what that is or how to torque in factory spec.
I really like to learn and I’ve all proper tools including torque wrench.
It has about 40K and engine idling sound somewhat rough to me (idling at 700K RPM).
Also, do I really need to adjust drive shaft bolt? It’s recommended on owner’s manual and I don’t know what that is or how to torque in factory spec.
I really like to learn and I’ve all proper tools including torque wrench.
With regard to the plugs, the EARLIEST I ever see this done is at 60K. I did do it, but late last year I switched back over to TorqueMaster Plugs (I am over 100K now) and found that my Densos were quite dirty (we had high sulfur fuel down here). The best way is to take one of them off and see what accumulation/color is there.
Driver
Joined: Jul 2007
Posts: 110
Likes: 1
From: California
Just replaced the plugs on my '04 RX330 with 45,000 miles. I installed Denso Iridium Power plugs and I can't believe the difference vs. the OE NGK Iridiums. My acceleration is much better, like a smooth rush of power. Too early to tell about the fuel economy but I bet that improves also.
CL Community Team
Joined: Apr 2001
Posts: 16,583
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From: Austin, TX
Salim
Lead Lap
Joined: Dec 2005
Posts: 604
Likes: 1
From: PA
My post was 15 months ago. 
Seriously, thank you for the input. I know what the driveshaft is but this is the first vehicle I have owned that asked for an inspection and possible retorque of the bolts.
From my reading in the past year, I can see that this isn't really necessary except for a periodic visual inspection.
Gary
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CL Community Team
Joined: Apr 2004
Posts: 17,337
Likes: 213
From: Miami, Florida
Salim, I am guessing you are a REALLY slow reader? My post was 15 months ago.
Seriously, thank you for the input. I know what the driveshaft is but this is the first vehicle I have owned that asked for an inspection and possible retorque of the bolts.
From my reading in the past year, I can see that this isn't really necessary except for a periodic visual inspection.
Gary
My post was 15 months ago. Seriously, thank you for the input. I know what the driveshaft is but this is the first vehicle I have owned that asked for an inspection and possible retorque of the bolts.
From my reading in the past year, I can see that this isn't really necessary except for a periodic visual inspection.
Gary
With regard to retorquing, I haven't seen this necessary at all each time I have checked them.
Last edited by Lexmex; Jun 19, 2008 at 05:37 AM.
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CL Community Team
Joined: Apr 2001
Posts: 16,583
Likes: 1,397
From: Austin, TX
I did not even look at the date 
Some how the thread got marked unread since last time I was here.
I am so dependent on "unread bold ... moved to top of the list"
Back to your question:
There is always a good reason for manufacturer to recommend something.
Salim
Some how the thread got marked unread since last time I was here.
I am so dependent on "unread bold ... moved to top of the list"
Back to your question:
There is always a good reason for manufacturer to recommend something.
Salim
Pole Position
Joined: Jun 2007
Posts: 212
Likes: 1
From: Tx
When to change plugs is around 40-60k depending on if your a professional race car driver or a 60 year old lady. Also depends on gas quality. Since your seeing rough idle just change then plugs. SITCK with NGK, and get fuel system cleaner.
Lead Lap
Joined: May 2006
Posts: 3,999
Likes: 37
From: FL
As a habit I do pull several plugs every 30K to look at engine health, however, that is another story.
Advanced
Joined: Aug 2002
Posts: 620
Likes: 101
From: Colorado, USA
I had ours changed at 93K in my wife's 04 RX330 and visually they looked to be in very good shape. I was getting the timing belt and water pump done at the same time, so I just had the entire package taken care of.
Driver
Joined: Jul 2007
Posts: 110
Likes: 1
From: California
I installed DENSO Iridium Power plugs in my RX330 last week at 44,000 miles. They are fantastic plugs! Increased horsepower and fuel economy. They are a performance plug however so they should be replaced after about 30,000 miles. If you want more mileage than that, go with the DENSO Iridium Long Life plug, those will last 100,000 miles.
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