I have a 1989 Integra LS.

What are good spark plugs to put in this car?

 

NGK Coppers should be just fine.

 

How bout the Nippondenso ones listed in the manual? (Q20PR-U11) Would they be equivalent?

 

Those will work too. I am pretty sure Denso and NGK plugs are used most for Honda's/Acuras.

 

You mention copper, but how about platinum? I have a feeling that they are not so recommended.

 

Platinums are not recommended simply because they are about 4x the price. Yes they last longer, but changing a set of coppers every year only costs you $8.00, you have fresh plugs that do exactly the same ting, and it STILL costs less. Just go with Denso or NGKs. No need for anything else unless you are heavily modified.

 

Thanks!! Since Denso copper ones are easy to come by, then they are the ones for me.

 

It's an 89 dude. I had one, once upon a time. At one point it's gonna run as good it is running. No more no less...

 

I wish someone could tell how to get my low speed (idle) emissions numbers to improve! Then I will be all set for a few more years. I wonder if a new cat. will resolve such a problem.