Are COPS hard on plugs?
#1
Elite Member
Thread Starter
iTrader: (21)
Join Date: Jun 2007
Location: Rochester, NY
Posts: 6,633
Total Cats: 1,284
Are COPS hard on plugs?
This is not Miata specific, but just a general question on COPS setups.
My DD has factory COPS. It's a 6 cylinder (3.7L) Jeep Liberty. I recently changed the plugs as routine maintence at about 60K miles. Those plugs (NOT* original, by the look) were absolutely shot. As in gap so large that I was surprised the damn thing ran. Electrodes were very worn, and all were worn off at an angle of about 60 degrees to the centerline, as well as rounded off all around.
The thing didn't run rough, and changing the plugs made very little difference, except that mileage improved by 20%. The Jeep has done very little towing or off-roading. So, is this normal wear for a COP setup, or is it just a case of crappy factory plugs?
Edit: NOT the originals, as I had earlier mis-stated. They were cheap Autolites, new ones are Bosch.
My DD has factory COPS. It's a 6 cylinder (3.7L) Jeep Liberty. I recently changed the plugs as routine maintence at about 60K miles. Those plugs (NOT* original, by the look) were absolutely shot. As in gap so large that I was surprised the damn thing ran. Electrodes were very worn, and all were worn off at an angle of about 60 degrees to the centerline, as well as rounded off all around.
The thing didn't run rough, and changing the plugs made very little difference, except that mileage improved by 20%. The Jeep has done very little towing or off-roading. So, is this normal wear for a COP setup, or is it just a case of crappy factory plugs?
Edit: NOT the originals, as I had earlier mis-stated. They were cheap Autolites, new ones are Bosch.
Last edited by rleete; 09-23-2008 at 12:04 PM.
#4
Elite Member
Thread Starter
iTrader: (21)
Join Date: Jun 2007
Location: Rochester, NY
Posts: 6,633
Total Cats: 1,284
I was just surprised at how worn they were. I bought the Jeep used, with about 30K on it, and they claimed it had a "full tune up". I suppose they could have just been giving me a load of B.S.
But even if they were original, 60K shouldn't mean plugs are that far gone. Looking at them, you'd think they'd been in there for at least double that mileage. As I was doing mine, I was helping a buddy change his in a '04 Impala (what a huge pain in the ***!), and at 40K they looked nearly new.
But even if they were original, 60K shouldn't mean plugs are that far gone. Looking at them, you'd think they'd been in there for at least double that mileage. As I was doing mine, I was helping a buddy change his in a '04 Impala (what a huge pain in the ***!), and at 40K they looked nearly new.
Thread
Thread Starter
Forum
Replies
Last Post
StratoBlue1109
Miata parts for sale/trade
21
09-30-2018 01:09 PM
russian
Miata parts for sale/trade
6
10-08-2015 03:01 PM