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ACDelco 41-991 | Spark Plug
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ACDelco GM Original Equipment Double Platinum Spark Plugs are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These Double Platinum Spark Plugs are the high quality replacements for many vehicles on the road today. With a copper core and double platinum pads on the center electrode, these plugs are designed to deliver long-lasting performance. These premium aftermarket replacement spark plugs are manufactured to meet your expectations for fit, form, and function. ACDelco GM Original Equipment parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some ACDelco GM Original Equipment parts may have formerly appeared as GM Genuine Parts (OE) or ACDelco Professional. ? WARNING: Cancer and Reproductive Harm - https://www.P65Warnings.ca.gov
Original Equipment GAP .040
BRAND: ACDelco
FEATURES:
- ACDelco GM Original Equipment parts are designed, engineered and tested to rigorous standards, and are backed by General Motors
- Cadillac
- Double platinum point pad on center and ground electrode offer excellent durability and consistent voltage demands to help reduce wear on ignition system
- GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
- GM regularly updates production and service part designs to integrate new materials and technologies
- One-piece, fired-in suppressor seal blends three glass types for a gas-tight seal that helps reduce radio frequency and engine interference, regulate spark plug energy, and protect against compression pressures for long life
- Pure copper core results in cooler electrode temperature for maximized durability and fouling resistance
- Some ACDelco GM Original Equipment parts may have formerly appeared as GM Genuine Parts (OE) or ACDelco Professional
SPECIFICS:
| Approximate Resistor Value (k ohms) | 4-6 k ohms |
| Center Electrode Core Material | Copper |
| Center Electrode Tip Material | Platinum |
| 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. It is okay to replace one spark plug if it is fouled or damaged prior to scheduled maintenance, provided the source of the damage is found and corrected. |
| 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. Refer to your owner's manual or contact your vehicle's manufacturer for more 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? |
| Good Maintenance Practices - Section 1 - Bullet 1 | Grasp the spark plug boot and gently rotate it 90 degrees counterclockwise. Pull the spark plug boot and cable away from the spark plug. If necessary, use a spark plug boot removing tool. DO NOT grab or violently pull spark plug cables. |
| Good Maintenance Practices - Section 1 - Bullet 2 | Brush or air blast dirt away from the well areas before removing spark plugs. CAUTION: Use goggles to protect eyes from debris when applying compressed air to spark plug wells. |
| Good Maintenance Practices - Section 1 - Bullet 3 | Use the correct deep socket size to loosen each spark plug one or two turns. NOTE: To remove spark plugs from aluminum heads, allow the engine to cool. The heat of the engine, in combination with a spark plug that is still hot, may cause the spark plug threads to strip the cylinder head upon removal. |
| Good Maintenance Practices - Section 1 - Bullet 4 | Remove each spark plug and place each one in a tray by cylinder number. This will help identify and relate any unusual condition to the cylinder involved. |
| Good Maintenance Practices - Section 1 - Bullet 5 | Apply dielectric grease into the boot area to reduce the chance of exterior tracking on the buttress tower of the spark plug. This grease also promotes a good heat transfer between the spark terminal screw and boot terminal. |
| Good Maintenance Practices - Section 1 - Bullet 6 | Before installing new spark plugs, use a gap guide to make sure your new spark plugs have the correct gap. NOTE: ACDelco Professional Iridium Spark Plugs are pre-gapped during manufacturing. Never attempt to gap an ACDelco Professional Iridium Spark Plug. You could damage the spark plug. Replace any incorrectly gapped ACDelco Professional Iridium Spark Plugs with plugs that are correctly gapped. |
| Good Maintenance Practices - Section 1 - Bullet 7 | Install spark plugs or glow plugs to the proper torque per the manufacturers' specification. |
| Good Maintenance Practices - Section 1 - Header | Visually inspect spark plugs for signs of wear. Follow these steps for removing spark plugs for inspection, servicing or replacement: |
| Ground Configuration | Single |
| Ground Electrode Quantity | 1 |
| Ground Electrode Tip Design | Single Prong Electrode |
| Hex Size (in) | 5/8in |
| Manufacturer Heat Range | 22 |
| Pack Of | 1 |
| Programming Required | No |
| Resistor Type | Yes |
| Seat Type | Conical |
| 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 | Sluggish engine performance, loss of engine power, or decreased fuel economy |
| Signs of Wear & Troubleshooting - Section 1 - Bullet 3 | Lack of acceleration or loss of speed when driving uphill under load |
| Signs of Wear & Troubleshooting - Section 1 - Bullet 4 | Cracks in the upper or lower portion of the spark plug insulator |
| Signs of Wear & Troubleshooting - Section 1 - Bullet 5 | Chipped or broken insulator tips |
| Signs of Wear & Troubleshooting - Section 1 - Bullet 6 | Damaged spark plug boots |
| Signs of Wear & Troubleshooting - Section 1 - Header | Signs of wear for spark plugs include but are not limited to: |
DOWNLOADS:
APPLICATIONS:
- 2006-2009 Cadillac STS
- 2006-2009 Cadillac XLR
1-year Replacement unlimited-mileage warranty
Part Type:
Aftermarket
Brand Description:
Spark Plug
Product Description:
Double Platinum Spark Plug
Thread Diameter (Inch):
0.551
Pack Of:
1
Seat Type:
Tapered
Resistor Type:
Yes
Ground Configuration:
Standard
Ground Electrode Tip Design:
Standard
Pre-Gap Size (Inch):
0.04
Center Electrode Tip Material:
Platinum
Center Electrode Core Material:
Copper
Manufacturer Heat Range:
22
Reach (Inch):
0.689
Ground Electrode Quantity:
1
Insulator Height (Inch):
2.063
Hazardous Material:
No
Minimum Order Quantity:
8
Features & Benefits - Bullet 2:
Double platinum point pad on center and ground electrode offer excellent durability and consistent voltage demands to help reduce wear on ignition system
Features & Benefits - Bullet 4:
Some ACDelco GM Original Equipment parts may have formerly appeared as GM Genuine Parts (OE) or ACDelco Professional
Features & Benefits - Bullet 3:
Approved by US Legal 7/31/19
Features & Benefits - Bullet 1:
One-piece, fired-in suppressor seal blends three glass types for a gas-tight seal that helps reduce radio frequency and engine interference, regulate spark plug energy, and protect against compression pressures for long life
Life Cycle Status:
Announced
Pre-Gap Size (Millimeter):
1.02
Life Cycle Status Description:
Announced - Part has been announced to customers on a paper “New Number Announcement”. Part is active.
Approximate Resistor Value (k ohms):
4-6 k ohms
Item Level GTIN:
00707773015193
Reach (Millimeter):
17.5
Thread Diameter (Millimeter):
14
Insulator Height (Millimeter):
52.4
Signs of Wear & Troubleshooting - Section 1 - Bull:
Your engine having trouble starting, hesitating, or cutting out
Signs of Wear & Troubleshooting - Section 1 - Bull:
Cracks in the upper or lower portion of the spark plug insulator
Signs of Wear & Troubleshooting - Section 1 - Bull:
Lack of acceleration or loss of speed when driving uphill under load
Signs of Wear & Troubleshooting - Section 1 - Bull:
Chipped or broken insulator tips
Signs of Wear & Troubleshooting - Section 1 - Bull:
Damaged spark plug boots
FAQ - Question 4:
Are ACDelco spark plugs pre-gapped?
FAQ - Answer 2:
Yes, if it is the scheduled time for spark plug replacement. It is okay to replace one spark plug if it is fouled or damaged prior to scheduled maintenance, provided the source of the damage is found and corrected.
FAQ - Question 7:
Can I just clean my spark plugs instead of replacing them?
FAQ - Question 3:
Does a diesel engine require a different type of plug than a gas engine?
FAQ - Question 8:
Does ACDelco have marine spark plugs?
FAQ - Question 1:
Is there a recommended interval for changing my vehicle's spark plugs?
Features & Benefits - Bullet 7:
GM regularly updates production and service part designs to integrate new materials and technologies
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.
Features & Benefits - Bullet 6:
GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
FAQ - Question 2:
Should I change all of my vehicle's spark plugs at the same time?
Signs of Wear & Troubleshooting - Section 1 - Head:
Signs of wear for spark plugs include but are not limited to:
Features & Benefits - Bullet 5:
ACDelco GM Original Equipment parts are designed, engineered and tested to rigorous standards, and are backed by General Motors
FAQ - Question 6:
What is pre-ignition and can it damage my engine?
FAQ - Question 5:
When I replace my spark plugs, should I also replace my spark plug wires?
FAQ - Answer 8:
Yes, ACDelco has marine spark plugs for many applications.
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 4:
Yes. When ACDelco spark plugs are manufactured, they are pre-gapped to the correct gap specification.
Good Maintenance Practices - Section 1 - Bullet 1:
Grasp the spark plug boot and gently rotate it 90 degrees counterclockwise. Pull the spark plug boot and cable away from the spark plug. If necessary, use a spark plug boot removing tool. DO NOT grab or violently pull spark plug cables
Good Maintenance Practices - Section 1 - Bullet 2:
Brush or air blast dirt away from the well areas before removing spark plugs. CAUTION: Use goggles to protect eyes from debris when applying compressed air to spark plug wells.
Good Maintenance Practices - Section 1 - Bullet 4:
Remove each spark plug and place each one in a tray by cylinder number. This will help identify and relate any unusual condition to the cylinder involved.
Good Maintenance Practices - Section 1 - Bullet 5:
Apply dielectric grease into the boot area to reduce the chance of exterior tracking on the buttress tower of the spark plug. This grease also promotes a good heat transfer between the spark terminal screw and boot terminal.
Good Maintenance Practices - Section 1 - Bullet 7:
Install spark plugs or glow plugs to the proper torque per the manufacturers' specification.
Good Maintenance Practices - Section 1 - Header:
Visually inspect spark plugs for signs of wear. Follow these steps for removing spark plugs for inspection, servicing or replacement:
Hex Size (in) (Inch):
5/8
Country of Origin:
Japan
Weight - Case (Gross Pounds):
08.64
Height - Case (Inch):
05.38
Length - Case (Inch):
07.50
Width - Case (Inch):
06.50
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