I've got an 86 60 thats stock with all the smog stuff in tact. It's got 170K on the motor.
I live just above S.F. so it has to go through a pretty strict test (15 and 25mph treadmill test).
It passed smog a year (4500 miles) ago when I first got it (put on a new CAT beforehand just in case) and it went through OK. Now, 12 months and only 4500 miles later it failed really bad. The only mod I've done is a new vacuum secondary diaphragm.
I have to go through a "test only" center so I have to make all my adjustments, get a pre test at another shop and THEN get it tested.
I adjusted the valves after the first smog check, which improved MPG and power, but i'm not sure if it jacked up the emissions.
The CO was at 2.43% @ 15mph and 2.55% @ 25mph
The HC was at 180ppm @ 15 mph and at 182ppm @ 25mph
I noticed that the timing was at 6BTDC when it passed and at 10BTDC when if failed so I know it needs to be retarded.
My other things I need to change are:
Plugs
Oil
Put in Supreme Gas
Raise the idle from 650 to about 850-950
Put in some of that gas treatment
Also, I know I need to heat up the cat before I go in.
Does anyone have any other suggestions?
I'm not sure if gapping the plugs wider or narrower than spec would make a difference.
Any advice would be much appreciated!
Bryan
I live just above S.F. so it has to go through a pretty strict test (15 and 25mph treadmill test).
It passed smog a year (4500 miles) ago when I first got it (put on a new CAT beforehand just in case) and it went through OK. Now, 12 months and only 4500 miles later it failed really bad. The only mod I've done is a new vacuum secondary diaphragm.
I have to go through a "test only" center so I have to make all my adjustments, get a pre test at another shop and THEN get it tested.
I adjusted the valves after the first smog check, which improved MPG and power, but i'm not sure if it jacked up the emissions.
The CO was at 2.43% @ 15mph and 2.55% @ 25mph
The HC was at 180ppm @ 15 mph and at 182ppm @ 25mph
I noticed that the timing was at 6BTDC when it passed and at 10BTDC when if failed so I know it needs to be retarded.
My other things I need to change are:
Plugs
Oil
Put in Supreme Gas
Raise the idle from 650 to about 850-950
Put in some of that gas treatment
Also, I know I need to heat up the cat before I go in.
Does anyone have any other suggestions?
I'm not sure if gapping the plugs wider or narrower than spec would make a difference.
Any advice would be much appreciated!
Bryan