Dual ground electrode spark plugs

[TheSilkySmooth]

Originally Posted by mimelio

I used Bosch +4 plugs in a friends 2002 Echo and it actually gave it more punch (slightly) and a bit better gas mileage I changed them out for NGK Iridium plugs (on sale with rebate) after 50,000 miles with no problems.

Usually any car will respond to new plugs unless the heat range is way off or the electrode gap is off. One month down the road will tell a bigger tale. The ford dual-ended coil resonant ignition will spark the bosch plug - the toyota tiny coils will be toast. They NEED an easy to spark plug and the Ir fit the bill. Ir with small electrodes is biggest advance in plug design in 100 years. I racing we MADE our own plugs. Big secret - can't say anymore or Dick Childress will kill me ...