How many miles until I should change my plugs?

 

I don't know what year your car is , but if you have the two piece plugs , I think they changed sometime in 08 , the longer you wait the harder they are to get out without breaking ...

 

True Story and here it is! The Sooner the Better. AND FOLLOW THE PROCEDURE!

KC

 

That looks like a nightmare... I think I'll take it in to the local dealer when I need them out.

 

the dealership will charge you up the wazoo to change them and most likely they will break more than one and then charge you up the wazoo even more. Take a day, take your time, follow the procedure and you should be fine.

On another note I wonder if using something like seafoam before hand would help clean up some of the carbon deposits on the plugs??

 

The TSB says to Soak for a Minimum of 15 Minutes with the carb cleaner. If it were my car I would let it soak overnight. And Then you could use a bit of the Seafoam for another few hours for a 1-2 punch! The More Soaking and Lube the Better! Just don't go crazy and hydro lock the cylinder.

On a side note just yesterday I had a customer that said his local dealer in the SF Bay Area wanted $750.00 to do the plugs on his 05!
They were convinced they would be breaking plugs.


KC

 

Well mine's got 7 years and almost 70k miles on it - are the odds in my favor if I take my time and do the method you mentioned KC?

When I replaced my factory midpipe this winter I snapped off an exhaust manifold bolt and had to find a mechanic with a welder who I could tow the car to and bail me out of trouble. So I'm wary of taking on jobs I can't just knock out easily

 

You towed the car because of a snapped manifold bolt? :/

 

Free AAA tow is cheaper than a noise ticket or CO poisoning. And I couldn't find a conclusive answer on forums, but it seemed more likely to burn a valve with the short stock manifolds than just running open headers.

 

It's all about the sooner the better! I would be a whole lot more nervous at 100K. Expect the best and Prepare for the worst.

KC

 

This what I did.

https://themustangsource.com/f637/ch...-000-a-508513/

Search the site, there are many different thoughts and ideals.

 

What spark plug do folks recommend to avoid issues in the future? Autolite HT1 or Champion Double Platinum?

 

Dec 07 was the change for 08's. Brown plug boots denote the new heads with the new plugs. The old design had black plug boots.

 

Once the plugs are antiseized they don't get the carbon build up. You can use a 2 piece plug without an issue. I just pulled the plugs on my F150 (same issue) for the second time. Plugs had around 90,000 on them with antiseize, came out no problem with no carbon build up.

 

I changed mine at 50,000 miles. Took my time and followed the TSB. I soaked them, turned a little then soaked them some more. you can do it, just take your time. I didn't break any of them.

 

My Sc'ed 07 Mustang has 30,000 mile on it and I'm about to change Spark Plugs for the 6th time. I always change them once a year with Autolite HT0. I've never had a problem but I do use the anti-seize on the barrel. I have 5 used sets sitting on my garage shelve with appx 5,000 miles on each set.

 

why don't you pull them reantisieze them and then put them back in??

 

Going under the knife... that initial 1/8th turn is nerve wracking

and yes I know it looks disgusting in there. This car has seen several rough New England winters as a DD

 

They are worn out IMO and I put in new ones and antisieze them. The only reason Ford says there 100,000 plugs is so you don't mess with them until you are out of warrenty. When I notice a small hesiation or drop in rpm and mpg I change them.

 

I got 4 out fine, and the fifth broke really awkwardly in there. My removal tool won't work on this thing since it can't get anything to grip on.