Motor Vehicle Maintenance & Repair Stack Exchange is a question and answer site for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles. It only takes a minute to sign up.
Sign up to join this community
Still trying to diagnose an erratic positive fuel trims. Next step will be making sure that the lean condition i have is caused by less fuel delivered or weak spark not a vacuum leak. I pulled spark plugs today and took a picture. I would appreciate any insights on the status of all four cylinders.
Thank you!
The end with the spark gap is primary importance . What are you burning ? I have not seen that much crud since the leaded gasoline days. This much fouling would be typical of leaded fuel , not a worst case. At that time the deposits were very complex ; some combination of lead oxy sulfate with bromine. No significant difference between cylinders. You might try platinum plugs , although I never used platinum with leaded gasoline. Another thing that has changed along with lead removal is significant reduction of sulfur. So, I have no clue other than it looks like leaded gas fouling.
