Spark plug mystery.

[fwdturbobov1996]

So I just installed ngk7es in my car. Turn it up, fires right up, tach jumps everywhere. 1k, 1500, 1200. Like it is bouncing up and down, turn the car off, start it back up, same thing, let it idle for 30 seconds. It is still jumping. I put the old ngk r plugs back in, works fine, tach is normal.

Now with the 7's the idle SOUNDS steady, but the tach is jumpy. Previous owner said that the 6es were fine but he always had a problem with 7es. Now my question to you all is what could this be, how could it interfere with the tach. What happens when I run 20+ psi and need a colder plug? What are my options. Mainly Im looking to figure this problem out, everyone from this area has never seen this problem.

 

[Jslove1408]

Just keep the 6's in it they should be fine up to 22lbs or so. but I have never heard of this problem with the 7's.

 

[fwdturbobov1996]

They were sold out of 6's so I purchased teh 7's. 22 lbs yea, but what happens when I get higher.

 

[fwdturbobov1996]

No one knows around here. Havent talked to the local dsm expert yet tho

 

[billys90tsi]

mine did that same thing with the 7's but i made the gap smaller and it stopped for me.

 

[big_eskimo]

The first thing that come's to my mind is that your ignition system is aging and is having a hard time firing the larger gapped plugs. You may want to look into an aftermarket ignition system and components if you really want to run those plugs. Just my .02 cents.

 

[HearMeSpoolin]

im gonna switch back to the stock ones, i put in the 7's and my car runs alot diff now

 

[fwdturbobov1996]

Thanks for the ingition advice. The car has brand spanking new like everything. Ill try gaping the plugs closer and if that doesnt work then msd here i come.

 

[fwdturbobov1996]

I feel like a moron. Problem solved