New plugs/gap causing rough idle.
Le Mans Master
Joined: May 2016
Posts: 7,232
Likes: 1,546
From: Florida
My suggestion is to go back to 6s and work out through the tune what is not working at WOT. Or, if you insist on the 7s, get timing table adjusted and see if it can smooth out some at idle, but you're in a trade off range.
Thread Starter
Racer
Joined: Mar 2016
Posts: 495
Likes: 35
You're two steps colder now on plugs. Assume you're an LS2/3, cold plugs by two steps are going to perform best at WOT with normal op temps, and that assumes you have a dialed in tune, but sacrifice at idle and mid range. Plugs are too cold to perform well at low cylinder air mass.
My suggestion is to go back to 6s and work out through the tune what is not working at WOT. Or, if you insist on the 7s, get timing table adjusted and see if it can smooth out some at idle, but you're in a trade off range.
My suggestion is to go back to 6s and work out through the tune what is not working at WOT. Or, if you insist on the 7s, get timing table adjusted and see if it can smooth out some at idle, but you're in a trade off range.
Safety Car
Joined: Nov 2007
Posts: 4,436
Likes: 875
From: Bay Area CA
I'm running NGK TR7ix plugs and the car idles smooth with an A&A kit.
Check spark plug wires, maybe by pulling on them you might have a crack on one causing a slight miss.
If the car idled smoother before the spark plug change, then it's has to be a bad spark plug or spark plug wire.
I felt no difference in idle quality dropping from TR6's to TR7 ix's and both gapped at .032.
Check spark plug wires, maybe by pulling on them you might have a crack on one causing a slight miss.
If the car idled smoother before the spark plug change, then it's has to be a bad spark plug or spark plug wire.
I felt no difference in idle quality dropping from TR6's to TR7 ix's and both gapped at .032.
Last edited by Mike's LS3; Mar 8, 2017 at 11:49 AM.
Team Owner
Joined: Nov 2007
Posts: 24,035
Likes: 2,342
From: Gilbert AZ
EF are a non projected tip that many don't like the idle of. Seen this a few times. Not sure why. Friend couldn't stand them and went back to 6s. The 7ix are a projected like stock. I would try those if you need a 7 range. If you were looking all I would give you a set.
Drifting
Joined: Mar 2011
Posts: 1,448
Likes: 56
From: Bath NC
I ran the factory plugs with a big cam and all was fine. .040 gap. I ran the TR6 and they were rough. Narrowed the plug gap to .024, Idle cleaned up a lot but not perfect. I'm going to retune. The car temps were the same with both sets of plugs on the track. 215 coolant, 225 oil. I have a large oil cooler. Used to see 275 oil temps.
