Looking through the CLS manual about spark plug gap, it states that for new it sould be .04" (1.1mm) . But my friend told me that in the HELMS manual it states that the gap should be 'between' .039-.043.

So my question is what is the benifit of having a smaller gap compared to one that is larger?









Juker008

 

wider gap usually helps to increase burn time and thus equaling more power.

 

...until you reach a point where
a) Spark has trouble jumping the gap and you get miss fires (better ignition will cure that)
b) Spark get's blown out (the case with applications with boost). Then you usually have to lower the gap to ensure no misfires.

 

Yes! You are correct Thanks for filling in what i left out.

 

So would u guys say go ahead and have the gap on new plugs at .045 (manual says .040 new)?








Juker008

 

.43 would be good. Go with what the manual says. I would also check the spark plug manufacturer website.

 

Are the denso iridium plugs good ? If so how much are they and where would I go about getting them .

 

www.imotorgear.com


Cheapest, not the fastest, but fee s/h.






Juker008

 

what kind of plugs do u recommend ?

 

IK20









Juker008

 

Noob question here. Does the NGK iridium spark plug come with a standard gap that is good for the 2nd gen tl? Or will i need to buy a gapper and adjust the spark plug gap?

 

use the factory recommended plugs and DO NOT GAP them, they already come gapped. you can damage the electrode tips if you gap them. Plugs in our cars are rated for 120K miles so you should be fine. I pulled mine at 90K and they were still pristine but I changed them anyways. Did not notice any difference in how the car ran. I am now at 138K

 

Yes, as stated above, do NOT try to gap them. You can carefully check that they are the correct gap but they should already be there.

 

Thanks dude^