Denso ESR-U Resistor U-Groove Spark Plug

DENSO's patented U-Groove spark plug enables complete combustion by allowing the spark to fill the gap created by the U shape. The ball of fire created in the U-Groove develops a larger and hotter flash front that virtually eliminates excessive fouling and erratic starts caused by poor fuel mixtures.

Even DENSO's "standard" spark plug is something special. The innovative design that helped to make DENSO spark plugs famous, the U-groove plug employs a unique, channeled ground electrode designed to generate a larger spark nucleus at the point of ignition. Greater spark energy than ordinary plugs means improved flame travel, producing more complete, consistent, and efficient combustion.

Vehicle Fitments:

Year	Make	Model	Submodel
1991 - 1994	Alfa Romeo	Spider	Base
1985 - 1990	Alfa Romeo	Spider	Graduate
1986 - 1990	Alfa Romeo	Spider	Quadrifoglio
1982 - 1994	Alfa Romeo	Spider	Veloce
1963 - 1969	Chevrolet	C10 Pickup	Base
1968 - 1969	Chevrolet	C10 Suburban	Base
1963 - 1969	Chevrolet	C20 Pickup	Base
1968 - 1969	Chevrolet	C20 Suburban	Base
1963 - 1969	Chevrolet	C30 Pickup	Base
1964 - 1965	Chevrolet	G10 Van	Base
1964 - 1968	Chevrolet	K10 Pickup	Base
1968	Chevrolet	K10 Suburban	Base
1964 - 1968	Chevrolet	K20 Pickup	Base
1968	Chevrolet	K30 Pickup	Base
1963 - 1967	Chevrolet	P10 Series	Base
1964 - 1967	Chevrolet	P20 Series	Base
1964 - 1967	Chevrolet	P30 Series	Base
1963 - 1966	Chevrolet	Suburban	Base
1967	GMC	C15/C1500 Pickup	Base
1967	GMC	C25/C2500 Pickup	Base
1967	GMC	C35/C3500 Pickup	Base
1967	GMC	K15/K1500 Pickup	Base
1967	GMC	K25/K2500 Pickup	Base
1967	GMC	P15/P1500 Van	Base
1967	GMC	P25/P2500 Van	Base
1967	GMC	P35/P3500 Van	Base
1963 - 1965	GMC	PB1000 Series	Base
1966	GMC	PB15 Series	Base
1966	GMC	PB25 Series	Base
1963 - 1966	GMC	Suburban	Base
1987 - 1990	Jeep	Grand Wagoneer	Base
1985 - 1988	Jeep	J10	Base
1985 - 1988	Jeep	J20	Base
1970 - 1971	Porsche	914	6, 4
1972 - 1973	Porsche	914	Base
1985 - 1987	Renault	Alliance	DL, Base, L
1987	Renault	Alliance	GS, GTA
1985 - 1986	Renault	Alliance	Limited
1985	Renault	Encore	Base
1986	Renault	Encore	Electronic
1985 - 1986	Renault	Encore	Limited, LS, GTX, GS, S
1971 - 1974	Renault	R12	Base
1972 - 1974	Renault	R15	Base
1969 - 1971	Renault	R16	Base
1972 - 1975	Renault	R17	Base
1974 - 1975	Renault	R17	Gordini
1974	Renault	R17	TL
1971 - 1972	Volkswagen	411	Base
1973 - 1974	Volkswagen	412	Base
1972 - 1974	Volkswagen	Campmobile	Base
1972 - 1974	Volkswagen	Transporter	211
1972 - 1973	Volkswagen	Transporter	215
1972 - 1979	Volkswagen	Transporter	Base
1975 - 1979	Volkswagen	Transporter	Kombi, Campmobile
1990 - 1991	Volkswagen	Vanagon	Base
1986	Volkswagen	Vanagon	Bus
1989 - 1991	Volkswagen	Vanagon	Carat
1983 - 1991	Volkswagen	Vanagon	GL, Campmobile
1983 - 1986	Volkswagen	Vanagon	L
1986 - 1991	Volkswagen	Vanagon	Syncro