Why does my Mehran give poor mileage even after a recent tune-up — could it be spark-related?

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Why does my Mehran give poor mileage even after a recent tune-up — could it be spark-related?

I recently got my Mehran tuned, but the fuel average is still worse than expected. It’s running rich and smells of unburnt fuel. Could this be due to weak spark o r bad plug gaps? What’s the recommended spark plug gap for Mehran in Pakistan?

Gari Specialist asked on 24 Apr 2025 13:33:47 pm

1 Answer

17 views |

Gari Master - on 24 Apr 2025 13:37:39 pm

Yes, even after a tune-up, incorrect spark plug gap o r weak spark can cause poor fuel average. If plugs are not gapped correctly, they can’t ignite the fuel-air mix properly, leading to rich fuel burning, black smoke, o r rough idle. In Pakistan, plug gaps should be checked with a feeler gauge and set to 0.8 mm. Also, check for carbon buildup and replace plugs every 10,000–15,000 km depending on fuel quality.