Spark Plug - ACDelco (21)
21
Spark Plug - ACDelco (21)
21
- Sale Price: $4.88
Details
- Brand:
- SKU:
21
- GTIN: 00808709306566
- UPC: 808709306566
- Other Names:
19323046
- Description: ACDelco Gold (Professional) RAPIDFIRE Spark Plugs are a high quality alternative to Original Equipment (OE) parts. These RAPIDFIRE Single Platinum Performance Spark Plugs are designed for everyday use and are a high quality replacement for many vehicles on the road today. These premium aftermarket spark plugs have high-quality suppressors that help prevent misfiring, an improved plug to boot seal, and a pure copper core for greater durability. These premium aftermarket replacement spark plugs are manufactured to meet your expectations for fit, form, and function. ACDelco Gold (Professional) parts are manufactured to meet your expectations for fit, form, and function, making them a smart choice for General Motors vehicles, as well as most makes and models, including special applications. These high-quality parts are backed by General Motors. Some ACDelco Gold parts may have formerly appeared as ACDelco Professional. ⚠ WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
spark-plug; - Condition: New
California Proposition 65
WARNING: Cancer and reproductive harm - www.P65Warnings.ca.gov Also Purchased
Vehicle Fitment
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| Year | Make | Model | Body & Trim | Engine & Transmission |
|---|
Product Reviews
ACDelco
ACDelco is the official parts brand of General Motors, providing genuine OEM components and high-quality aftermarket parts for GM vehicles as well as many other makes. Known for its reliability and engineering precision, ACDelco offers a full range of parts including batteries, filters, brakes, spark plugs, and fluids—all designed to meet or exceed GM’s factory standards. With product lines like ACDelco Original Equipment, Gold, and Silver, the brand delivers options for both premium replacements and value-focused repairs, all backed by GM’s quality assurance and nationwide warranty support.
Easily order your Spark Plug ( 21) for your vehicle today!
Order more ACDelco Parts here.
Need more parts? We carry full inventories of OEM parts for all GM vehicles. Select what vehicle you want to shop for below to get started:
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Spark Plug - ACDelco (21)
21
Sale Price$4.88
Description : ACDelco Gold (Professional) RAPIDFIRE Spark Plugs are a high quality alternative to Original Equipment (OE) parts. These RAPIDFIRE Single Platinum Performance Spark Plugs are designed for everyday use and are a high quality replacement for many vehicles on the road today. These premium aftermarket spark plugs have high-quality suppressors that help prevent misfiring, an improved plug to boot seal, and a pure copper core for greater durability. These premium aftermarket replacement spark plugs are manufactured to meet your expectations for fit, form, and function. ACDelco Gold (Professional) parts are manufactured to meet your expectations for fit, form, and function, making them a smart choice for General Motors vehicles, as well as most makes and models, including special applications. These high-quality parts are backed by General Motors. Some ACDelco Gold parts may have formerly appeared as ACDelco Professional. ⚠ WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
spark-plug;
spark-plug;
- Return Policy
- Min. 12 Months
- Safe, Secure Checkout
Product Details
Description
ACDelco Gold (Professional) RAPIDFIRE Spark Plugs are a high quality alternative to Original Equipment (OE) parts. These RAPIDFIRE Single Platinum Performance Spark Plugs are designed for everyday use and are a high quality replacement for many vehicles on the road today. These premium aftermarket spark plugs have high-quality suppressors that help prevent misfiring, an improved plug to boot seal, and a pure copper core for greater durability. These premium aftermarket replacement spark plugs are manufactured to meet your expectations for fit, form, and function. ACDelco Gold (Professional) parts are manufactured to meet your expectations for fit, form, and function, making them a smart choice for General Motors vehicles, as well as most makes and models, including special applications. These high-quality parts are backed by General Motors. Some ACDelco Gold parts may have formerly appeared as ACDelco Professional. ⚠ WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
spark-plug;
spark-plug;
Part Number (MPN)
21
Brand
SKU
21
UPC / GTIN
808709306566 / 00808709306566
Condition
New
Other Names
19323046
Brand
ACDelco Gold
Center Electrode Core Material
Copper
Center Electrode Design
Standard
Center Electrode Tip Material
Platinum
Core Nose Length
0.560
Electrical Terminal Type
Non-Removable Nut
FAQ - Answer 1
Yes, this interval depends on what type of spark plug your vehicle requires. Refer to your owner's manual or contact your vehicle's manufacturer for more information.
FAQ - Answer 2
Yes, if it is the scheduled time for spark plug replacement.
FAQ - Answer 3
Yes. Diesel engines require glow plugs because diesel engines operate differently than gas engines. ACDelco Professional Glow Plugs are specially designed to give diesel engines the heat they need for their cold starts. Contact your local dealer, ACDelco service center, or refer the manufacture's service information.
FAQ - Answer 4
Yes. When ACDelco spark plugs are manufactured, they are pre-gapped to the correct gap specification.
FAQ - Answer 5
Not always, but you should inspect your spark plug wires for wear when replacing your spark plugs. Refer to your vehicle owner's manual or contact the manufacturer for more information.
FAQ - Answer 6
Yes, pre-ignition can cause serious damage to your engine. Pre-ignition is the ignition of fuel before the actual spark occurs, which causes a rapid temperature rise in the combustion chamber that can damage engine components and melt spark plug electrodes. Causes of pre-ignition include but are not limited to a buildup of deposits that can become incandescent in the combustion chamber, improper installation torque being applied to spark plugs, and having spark plugs with a heat range that is too hot for the engine's operating condition.
FAQ - Answer 7
No, cleaning your old spark plugs is not recommended. Dirty, fouled spark plugs may also have broken or chipped insulator tips, worn electrodes, or worn or missing side wires. These conditions severely affect spark plug performance. Replace your dirty, fouled spark plugs with new ACDelco spark plugs.
FAQ - Answer 8
Yes, ACDelco has marine spark plugs for many applications.
FAQ - Question 1
Is there a recommended interval for changing my vehicle's spark plugs?
FAQ - Question 2
Should I change all of my vehicle's spark plugs at the same time?
FAQ - Question 3
Does a diesel engine require a different type of plug than a gas engine?
FAQ - Question 4
Are ACDelco spark plugs pre-gapped?
FAQ - Question 5
When I replace my spark plugs, should I also replace my spark plug wires?
FAQ - Question 6
What is pre-ignition and can it damage my engine?
FAQ - Question 7
Can I just clean my spark plugs instead of replacing them?
FAQ - Question 8
Does ACDelco have marine spark plugs?
Features & Benefits - Bullet 1
Solid state suppressor, with two-piece glass and brass seal, can help reduce radio frequency interference, regulates spark energy for long electrode life, and helps protect against high combustion pressures
Features & Benefits - Bullet 2
Pure copper core provides great heat transfer and helps maximize plug durability
Features & Benefits - Bullet 3
Platinum on center electrode enables superior spark characteristics and can reduce voltage requirements of the ignition system
Features & Benefits - Bullet 4
Ribless insulator helps optimize plug to boot sea
Features & Benefits - Bullet 5
Some ACDelco Gold parts may have formerly appeared as ACDelco Professional
Features & Benefits - Bullet 6
Premium aftermarket replacement part
Features & Benefits - Bullet 7
Manufactured to meet specifications for fit, form, and function for General Motors vehicles as well as most makes and models
Ground Configuration
Standard
Ground Electrode Core Material
Nickel
Ground Electrode Quantity
1
Ground Electrode Tip Design
Standard
Ground Electrode Tip Material
Nickel
Height (in)
1.19
Hex Size (mm)
16
Hex Type
Hex
Indexed
No
Indicated Mean Effective Pressure (IMEP)
270
Insulator Height
2.047<br />52
Length (in)
4.13
Manufacturer Heat Range
8
PADB ID 557
0.551<br />14.0
Pre-Gap Size
0.045<br />1.100
Reach
1.043<br />26.5
Resistor Type
Yes
Seat Type
Flat
Signs of Wear & Troubleshooting - Section 1 - Bullet 1
Your engine having trouble starting, hesitating, or cutting out
Signs of Wear & Troubleshooting - Section 1 - Bullet 2
Engine misfire
Signs of Wear & Troubleshooting - Section 1 - Bullet 3
Sluggish engine performance, loss of engine power, or decreased fuel economy
Signs of Wear & Troubleshooting - Section 1 - Bullet 4
Lack of acceleration or loss of speed when driving uphill under load
Signs of Wear & Troubleshooting - Section 1 - Bullet 5
Cracks in the upper or lower portion of the spark plug insulator
Signs of Wear & Troubleshooting - Section 1 - Bullet 6
Chipped or broken insulator tips
Signs of Wear & Troubleshooting - Section 1 - Header
Signs of wear for spark plugs include but are not limited to:
Skirt
No
Washer Type
Crush
Washer(s) Included
Yes
Weight (lb)
0.4
Width (in)
3.62
| Year | Make | Model | Body & Trim | Engine & Transmission |
|---|---|---|---|---|
Vehicle #1
Year
Make
Model
Body & Trim
Engine & Transmission
| Brand | Equivalent Part Numbers |
|---|---|
BrandEquivalent Part Numbers
ACCEL
378
ACDelco
83CTS, 83TS, 84TS, 85T, 85TS, 86TS, C85TS, R83CTS, R83TS, R84TS, R84TSX, R85TS, R86TS5
Autolite
156, 166, 3286, 34, 35, 36, 37, 44, 45, 45BP, 45DP2, 46, 46BP, 46DP2, 744, 745, 746, 747
Beck Arnley
1765178
Bosch
7550, 7551, 7950, 7951, D10B, D10BC, D6B, D6BC, D7B, D7BC, D8A, D8AC, D8B, D8BC, D9B, D9BC, DR10B, DR10BC, DR6BC, DR7BC, DR8B, DR8BC, DR9B, DR9BC, M12B
Champion Race Plugs
9033
Champion Spark Plug
11, 11C2, 11S, 21, 21CC, 21S, 22, 22CC, 22S, 4011, 409, REC8WYPB4, RF11YC, RF14YC, RF18YC, RF9YC
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Return Policy
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ACDelco
ACDelco is the official parts brand of General Motors, providing genuine OEM components and high-quality aftermarket parts for GM vehicles as well as many other makes. Known for its reliability and engineering precision, ACDelco offers a full range of parts including batteries, filters, brakes, spark plugs, and fluids—all designed to meet or exceed GM’s factory standards. With product lines like ACDelco Original Equipment, Gold, and Silver, the brand delivers options for both premium replacements and value-focused repairs, all backed by GM’s quality assurance and nationwide warranty support.
Easily order your Spark Plug ( 21) for your vehicle today!
Order more ACDelco Parts here.
Need more parts? We carry full inventories of OEM parts for all GM vehicles. Select what vehicle you want to shop for below to get started: