got one of my plugs out found 2 surprise first its a ITR4A15 in the manual they say 41-921 are they the same and could that be the stock plug second that plug is so white .that tell me that im lean so that would be a cause of KR and i got a set of 41-932 one step colder are they ok for a L36

I dunno about those plugs but from what i have gathered is that the autolite 605'* and the NGK TR-55'* are very good for the L36'*. I currently have the 605'* in my backseat and they were going in the day the tranny decided to let go. Doing a quick google search on your plugs that were in there and it looks like they shouldnt even be in there. Here is a link to a place i found that sells them and it gives a list of cars they should be in http://www.sportcompactonly.com/part_p-23842.htm That could be a reason for you knocking and also maybe even causing some misfires or something. DId you check the gaps on them?

Can you take a picture where we can actually see the plug versus the note with the hearts and x'* on it?

yeah funny bill i just realise that is a note from my girlfriend lolllllllllllll

I was serious about not being able to see the plugs enough to tell you anything.

BTW...don't let her know you put dirty car parts on the note..it won't go well for you.

well plugs are at 58 gap and they don't look like the stock ones for a 1998 but they are very lean so i guess changing my fuel filter is the first thing to do. still like to know if the ITR4A15 is a bad plug or a remplacement for a 41-921

the first number is an ngk. they actually manufacture a lot of the delco plugs. i dont have a cross reference, but ill bet theyre the same.

yeah its a ngk whit a delco on it irradium a 11 dollard plug cross reference 41-101 still going to change them for my 41-932 platinum and see they result

yeah the ngk irridiums are expensive,

and i think the correct plug for that eng is the 41-101 as u mentioned. delco is notorious for changing there numbers around. so the manual may say the 921s or whatever. but if u were to look in a more current application catelog, itd prob list the 41-101s.

keep us posted on how it works.

well take a look at those plugs tell if they are normal colors for you for a L36