I am looking for advice on how to pass smog as my car failed. it's a Honda Accord 95 with 166k miles. Before this test my car was in the shop for 2 months so it was not driven often. I often drive city only, not highway. I only drove 10 minutes to city for this test from a cold start.
test:
15 mph
hydrocarbons max is 61, I measured 66
25 mph
hydrocarbons max 37, measured 70
tech said I had unburned fuel due to high hydrocarbons.
After this, I added a whole bottle of Redline SL1 to 1/4 tank and 93 Shell Octane gas to a full tank. I have been driving over 200 miles so far, mostly all highway. Should I use Guaranteed to Pass or Isoheet after I exhaust this full tank of gas? Or is driving all highway now enough to burn off the unburned fuel? I check my exhaust and see black soot build up.
test:
15 mph
hydrocarbons max is 61, I measured 66
25 mph
hydrocarbons max 37, measured 70
tech said I had unburned fuel due to high hydrocarbons.
After this, I added a whole bottle of Redline SL1 to 1/4 tank and 93 Shell Octane gas to a full tank. I have been driving over 200 miles so far, mostly all highway. Should I use Guaranteed to Pass or Isoheet after I exhaust this full tank of gas? Or is driving all highway now enough to burn off the unburned fuel? I check my exhaust and see black soot build up.