NGK 5688 spark plug for the 1988-1992 Toyota Corolla 4-cylinder 1.6L and other vehicles ignites the air-fuel mixture in the cylinder. Among NGK spark plugs, this Iridium IX plug suits modified or high-performance engines.
- Single iridium tip: 0.6 mm fine wire center electrode for durability and a stable spark
- Iridium alloy center electrode with six times the density of platinum and a very high melting point
- Tapered cut ground electrode with a reduced quenching design for ignitability, acceleration and fuel efficiency
- Solid copper core, 98% pure copper, for heat dissipation, conductivity and wide heat ranges
- Trivalent metal plating for corrosion and seizing resistance, so the plug installs and removes easily
Quick facts
- Part: NGK 5688 spark plug
- Fits: 1988-1992 Toyota Corolla 4-cylinder 1.6L and other vehicles
- Condition: New
Hard starting, a rough idle, misfires or weaker fuel economy can mean the spark plugs are worn, though a faulty ignition coil or a fuel injector can produce the same signs, so find the cause before replacing them.
Fits
Vehicles it fits include the 1988-1992 Toyota Corolla 4-cylinder 1.6L, which takes four plugs, the 1988 Toyota 4Runner V6 3.0L, which takes six, and the 1991-1994 Saab 900 4-cylinder 2.1L. If your car is not named here, look up its year and engine in the "Vehicles it fits" section.
Specifications
Fit and size
- Thread size: M14 - 1.25
- Quantity per vehicle: 4 on the 4-cylinder engines, 6 on the V6 3.0L
Build and materials
- Center electrode: single iridium, 0.6 mm fine wire
- Ground electrode: tapered cut
- Core: solid copper
- Plating: trivalent metal
- Condition: New
- NGK part number: BCPR5EIX
Interchange: Q16-U · .K5RTP
1765251 · 4706 · 5301 · IQ16 · IQ16TT · BCPR5EIX · 5958780
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
Is the NGK 5688 the right spark plug for the 1988-1992 Toyota Corolla 4-cylinder 1.6L?
Yes. NGK 5688 fits the 1988-1992 Toyota Corolla 4-cylinder 1.6L, and that engine takes four plugs.
Does the NGK 5688 work as a spark plug for the 1988 Toyota 4Runner V6 3.0L?
Yes. NGK 5688 fits the 1988 Toyota 4Runner V6 3.0L, which takes six. If your car has another year or engine, look it up in the "Vehicles it fits" section.
What is the center electrode made of on NGK iridium spark plugs like this 5688?
This plug has a 0.6 mm fine wire iridium tip on the center electrode, with a solid copper core. Iridium is six times the density of platinum.
Is this NGK Iridium IX spark plug meant for stock or performance engines?
This NGK 5688 is recommended for modified or high performance applications, or as an upgrade to OE nickel alloy spark plugs.
Is NGK BCPR5EIX the same plug as the 5688?
Yes. BCPR5EIX is NGK's service number and 5688 is its stock number for this spark plug, so either one points to the same plug.
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- Installation instructions PDF
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- Installation instructions PDF
- Installation instructions PDF
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- Installation instructions PDF
- Installation instructions PDF
- Installation instructions PDF
- Installation instructions PDF
- Installation instructions PDF
- Installation instructions PDF
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- Technical bulletin PDF
- Brand image 1 Diagram
- Brand image 2 Diagram
- Brand image 3 Diagram
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