Motor Knocks at idle after Spark Plug change?

[TheBigPhantom]

would using autolite platinums in a 95 gsx gapped at .29 cause slight audible knock at idle?

 

[knochgoon24]

Did you hook the wires back up right? Double check those.

 

[blcknspo0ln]

What kind of knock? describe it as best you can. If it's a light tapping sound, it's probably lifter tick. If it sounds deeper and more towards the bottom of the engine it might be developing rod knock.

Oh and switch back to NGK spark plugs, nothing runs better than those suckers. Judging by your mod list, you will need NGK BPR6ES gapped at .028

 

[Freerevving]

somehow I doubt the plugs are causing the knock... but I've had bad experiences with Bosch and Autolite Platinums... they both can make engines run "funny"

It is however possible, especially if the plugs run too hot.

 

[mentalTSiAWD]

Try a little troubleshooting and put the old plugs back in and see if it goes away.

 

[DSM1G90]

We all have to remember that basic NGK's are loaded with a resistor in the tower to flatten the spark just a bit whereas all of the others have a much quicker spark and platinum is the worst due to it's not the greatest electrical conductor.

People like platinum and those other fancy ones for the sheer joy in not changing out plugs every 15k miles - it's just a convenience thing.

Plus, our earlier ignitions were set up for standard plugs and if you go fancy, there will be an imbalance of sorts.

 

[Redwidow]

Did you get the right plugs for the car?...are they maybe a sligth bit longer than the ones before? just wondering.

 

[TheBigPhantom]

Sorry for some reason I don't get emails when users post replies.

But the knocking sound doesn't sound like Rod Knock quite yet (I've gone through three motors)

It sounds like a scratchy louder than lifter tick but similar to the sound.

I was thinking like widow says it might be the length of the plug..I also torqued them down to 18ft/lbs.

and I gapped them to what the guide said on the back which is .29.

As a side note the head had a 97 CAS on the left by the thermostat housing which I removed and replaced with a 95 hole plug because my car is a 95. And when I was doing timing I had to replace the bottom CAS because the CAS rotating shield was bent and it damaged the old one.

So I'm thinking it can be one of these things.

A. Spark Plugs are too long
B. Removing the 97 CAS somehow unbalanced the Cam and now its rattling?
C. The CAS disc that was bent is still bent and is somehow hitting the lower CAS?
D. My timing is off..

What do you guys think?

I'll take a video of it tonight...but I might be taking it to strictly modified in Schaumburg...I WANT MY CAR TO BE RUNNING SO BAD AGAIN!! its been down for 6 months ='(

 

[robinho609]

nothing works better than the good ol NGK

 

[Freerevving]

I think it's the headlight fluid

 

[knochgoon24]

and I gapped them to what the guide said on the back which is .29.

I really hope you mean .029.