Dealer prices are always high so that # seems about right. For a Indy with around $100 an hour probably $300-400.

How many miles are on your car? I think 60k is a good time to change them out. Spark plugs are relatively cheap and take a beating in the combustion chamber. Nothing catastrophic unless one of the heads comes off (rare). Really just rough running.

 

Perfect, thanks so much. I currently have 50k miles and quite frankly I don't really notice a rough idle at all. I'll plan to replace them as soon as I notice any rough idling or running.

In case this helps anyone else in the future, my indy quoted 2.3 hours of labor to replace 10 spark plugs.

 

On a stock car, the plugs need changing every 37K miles, if modded, even less....
These plugs also serve as combustion monitoring for knock and misfire..
You can loose alot of response and power in general with old plugs on this motor..

 

I do mine every 10K miles...myself for $130 (10 plugs from Amazon).

The longer you let things wear, the more load it puts on other areas. As 5soko mentioned...plugs are used for more than just spark.

At least do it at the recommended intervals-otherwise pound foolish.

Got it, thanks guys. I'll have the indy replace them.

 

I do mine every 10K miles...myself for $130 (10 plugs from Amazon).

The longer you let things wear, the more load it puts on other areas. As 5soko mentioned...plugs are used for more than just spark.

At least do it at the recommended intervals-otherwise pound foolish.

 

I do mine every 10K miles...

Wow, that's pretty extreme. How much do you drive the car?

 

15,000 miles a year...family truckster until I blow the cobwebs out weekly.

 

Use antiseize! And a bit of lube on the underside of the rubber on the coil packs to make them easier to remove next time.

 

I get using dielectric on the underside of the rubber to make it easier to take out next time and to provide some additional anti-moisture protection - but the anti-seize will mess up the proper torque on the spark plugs - i.e. risk of over-torque, no?

 

N/A

 

Just curious did the O2 sensors solve the Increased Emissions issue ? Where they the pre or post sensors ? Thank you.

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Yes, that solved it. It was post in my case.

 

I changed my sparkplugs at 35000 miles,,,it is in the manual recommened at 37000 miles

Thank you.

 

Spark plugs are very easy to change yourself with surprisingly few tools required. Certainly no need for special tools etc. The DIY you can find on here is spot on and very easy to follow. I did mine a week ago and it can be done by even an amateur mechanic in less than 2 hours. As i'm fairly competent with the spanners, I'd say its simple to do in under an hour. Only thing I would add is the part where he says about putting an extension or similar item through the ignition coil. That technique works well for the front 4 cylinders on each side, but due to the space restriction at the back, the best way is to put a socket over the small mounting point for the ignition coils cover and then use that as a pivot with the extension through the coil clip and it comes out very easy.
I changed mine at 82'000 miles. I did not know when they were changed before that and decided to do a full service on the engine just to be safe. By the looks of the plugs, it was not a minute too soon.

 

Does someone knows the correct torque for the spark plugs?


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