Hello folks,
Plugs carbon fouling, and I need some more smarts.
1600 GTV, stock cams/carbs/jets/tubes. Always use 98 octane. Has hardly missed a beat in 3 years. No equipment changes or fiddling before symptoms arose.
My car began to run poorly on steady throttle, tho still pulled like a train under accel.
Did a few things:
Checked: timing, carb balance, float height/droop, wiring to from dizzy & coil, coil resistance, plug gaps, points gap. Air cleaner (crossover, canister style) not clogged.
Points spring broke while I was fiddling, replaced with Hotspark module (3+ ohm coil required, which my existing Bosch black coil easily exceeded, as did another I swapped in later to cross-check, both 3.3+.
Changed coil HT lead. Replaced plugs (B7ES), which still quickly fouled. Changed to B6ES. Still fouling, tho not as quickly.
Winding mixture screws in slows/reduces fouling, but even at the point where revs start to hang and carbs start to pop (@ 1-1.25 turns out) they are still inclined to foul.
Some extra research tells me:
- Weak spark can cause fouling (but wouldn’t the car run poorly under load too?)
- Alfaparticle quote: “coil resistance tells you what coil you have, not what condition it’s in”.
So...should I try a new coil?
What else might be at play?
Thanks in advance...
Plugs carbon fouling, and I need some more smarts.
1600 GTV, stock cams/carbs/jets/tubes. Always use 98 octane. Has hardly missed a beat in 3 years. No equipment changes or fiddling before symptoms arose.
My car began to run poorly on steady throttle, tho still pulled like a train under accel.
Did a few things:
Checked: timing, carb balance, float height/droop, wiring to from dizzy & coil, coil resistance, plug gaps, points gap. Air cleaner (crossover, canister style) not clogged.
Points spring broke while I was fiddling, replaced with Hotspark module (3+ ohm coil required, which my existing Bosch black coil easily exceeded, as did another I swapped in later to cross-check, both 3.3+.
Changed coil HT lead. Replaced plugs (B7ES), which still quickly fouled. Changed to B6ES. Still fouling, tho not as quickly.
Winding mixture screws in slows/reduces fouling, but even at the point where revs start to hang and carbs start to pop (@ 1-1.25 turns out) they are still inclined to foul.
Some extra research tells me:
- Weak spark can cause fouling (but wouldn’t the car run poorly under load too?)
- Alfaparticle quote: “coil resistance tells you what coil you have, not what condition it’s in”.
So...should I try a new coil?
What else might be at play?
Thanks in advance...