This page lists 63 ignition parts for the 1990 Buick Century, across 13 part types, covering both the 2.5L 151cid L4 and the 3.1L 189cid V6. Every part shows its brand, manufacturer part number and fitment notes.
The ignition system on the 1990 Buick Century delivers spark at the right moment — plugs, coils, wires, distributors and ignition modules. The largest groups are Spark Plug (18 parts), Ignition Coil (10 parts) and Ignition Lock Cylinder (8 parts). The other 10 part types cover the remaining 27 parts.
The 1990 Buick Century was sold with both the 2.5L 151cid L4 and the 3.1L 189cid V6. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
23 brands supply ignition parts for the 1990 Buick Century, led by STANDARD MOTOR PRODUCTS (12 parts), WELLS (5 parts) and UNITED MOTOR PRODUCTS (5 parts), plus 20 more brands. Quality grades include Standard Replacement, Economy and Copper / Nickel.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 1990 Buick Century. 12 parts have it, including STANDARD MOTOR PRODUCTS PC3 (Crankshaft Position Sensor) and DELPHI GN10123 (Ignition Coil). Each part number opens a page with every vehicle that part fits.
Crankshaft Position Sensor
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FAMOUS BRAND Fits: 2.5L 151cid L4 | CSA1548 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| SPECTRA PREMIUM Fits: 2.5L 151cid L4 | S10120 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| STANDARD MOTOR PRODUCTS Fits: 2.5L 151cid L4 | PC3T | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| ULTRA-POWER Fits: 2.5L 151cid L4 | 5S1669 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Popular Fits: 2.5L 151cid L4 | PC3 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WALKER PRODUCTS Popular Fits: 2.5L 151cid L4 | 2351007 | 🇺🇸 US 🇨🇦 CA | Sensor Only | View on Amazon |
| WELLS Fits: 2.5L 151cid L4 | 5S1669 | 🇺🇸 US 🇨🇦 CA | Sensor Body Diameter: 0.590 In | View on Amazon |
This table covers the sensors that report crankshaft position and engine speed. Typical signs include a stall, a no-start, or a code for cam or crank correlation. Check the connector and the reluctor gap before replacing the sensor.
7 Crankshaft Position Sensor parts for the 1990 Buick Century come from 6 brands — STANDARD MOTOR PRODUCTS, FAMOUS BRAND, SPECTRA PREMIUM and 3 other brands. The "Popular" part is STANDARD MOTOR PRODUCTS PC3.
The Economy section lists 4 options from FAMOUS BRAND, SPECTRA PREMIUM, STANDARD MOTOR PRODUCTS and 1 other brand — the catalog's value-priced group. FAMOUS BRAND CSA1548 is listed in this group.
In the Standard Replacement grade, STANDARD MOTOR PRODUCTS, WALKER PRODUCTS and WELLS supply 3 parts: built to original-equipment specification. A representative part number is STANDARD MOTOR PRODUCTS PC3.
Part numbers include STANDARD MOTOR PRODUCTS PC3, FAMOUS BRAND CSA1548 and SPECTRA PREMIUM S10120, among others listed above.
Crankshaft Position Sensor Bracket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 2.5L 151cid L4 | PCB1 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the brackets that mount the Crankshaft Position Sensor. Typical signs include a cracked mount, a rattle, or a bracket that no longer holds alignment. Confirm position in the notes. Many brackets look alike and bolt to different corners.
This group shows a single part: STANDARD MOTOR PRODUCTS PCB1.
Distributor Cap Cover
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 2.5L 151cid L4 | DR443T | 🇺🇸 US 🇨🇦 CA | T-Series | View on Amazon |
This table covers the Distributor Cap covers.
This group shows a single part: STANDARD MOTOR PRODUCTS DR443T.
Distributor Mounting Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MAHLE / CLEVITE Fits: 2.5L 151cid L4 | 72213 | 🇺🇸 US 🇨🇦 CA | Nitrile | View on Amazon |
| MAHLE / CLEVITE Fits: 2.5L 151cid L4 | B33003 | 🇺🇸 US 🇨🇦 CA | O-Ring TypeMolded Rubber | View on Amazon |
| VICTOR REINZ Fits: 2.5L 151cid L4 | 411044200 | 🇺🇸 US 🇨🇦 CA | O-Ring Type | View on Amazon |
This table covers the gaskets that seal the Distributor Mounting. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for.
3 Distributor Mounting Gasket parts are listed for the 1990 Buick Century, from MAHLE / CLEVITE and VICTOR REINZ.
Listed part numbers: MAHLE / CLEVITE 72213, MAHLE / CLEVITE B33003 and VICTOR REINZ 411044200.
Ignition Coil
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| B&B Fits: 2.5L 151cid L4 | BB5039 | 🇺🇸 US 🇨🇦 CA | 2 Req. | View on Amazon |
| HOLSTEIN Fits: 2.5L 151cid L4 | 2IGC0005 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| SPECTRA PREMIUM Fits: 2.5L 151cid L4 | C503 | 🇺🇸 US 🇨🇦 CA | Ignition Coil Mounts to Cylinder Head | View on Amazon |
| WAI GLOBAL Fits: 2.5L 151cid L4 | CDR39 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Premium
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DELPHI Popular Fits: 2.5L 151cid L4 | GN10123 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| UNITED MOTOR PRODUCTS Popular Fits: 2.5L 151cid L4 | C540 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| GM GENUINE Fits: 2.5L 151cid L4 | 19418991 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| NGK Fits: 2.5L 151cid L4 | 48780 | 🇺🇸 US 🇨🇦 CA | Includes Seal | View on Amazon |
| WALKER PRODUCTS Fits: 2.5L 151cid L4 | 9201005 | 🇺🇸 US 🇨🇦 CA | Single Coil | View on Amazon |
| WELLS Fits: 2.5L 151cid L4 | 5C1058 | 🇺🇸 US 🇨🇦 CA | Ignition Type: Distributorless | View on Amazon |
This table covers the coils that fire each spark plug. Typical signs include a misfire that follows one cylinder, a snap in damp weather, or a coil that is swollen or cracked. Swap a suspect coil with a neighbor to confirm, then replace boots that tore on the way off.
10 Ignition Coil parts for the 1990 Buick Century come from 10 brands — B&B, HOLSTEIN, SPECTRA PREMIUM and 7 other brands. The "Popular" part is DELPHI GN10123.
The Economy section: 4 options from B&B, HOLSTEIN, SPECTRA PREMIUM and 1 other brand. B&B BB5039 is listed in this group.
In the Premium grade, DELPHI supplies 1 part: a step above OE specification in materials, tolerances or warranty terms. A representative part number is DELPHI GN10123.
Standard Replacement: 5 parts, from UNITED MOTOR PRODUCTS, GM GENUINE, NGK and 2 other brands. A representative part number is UNITED MOTOR PRODUCTS C540.
Ignition Coil Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 2.5L 151cid L4 | 19260632 | 🇺🇸 US 🇨🇦 CA | electronic module, FOR 2 TERMS, TYPE II-D/REMY | View on Amazon |
This table covers the seals at the Ignition Coil. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
One part is listed for the 1990 Buick Century — GM GENUINE 19260632.
Ignition Control Module (ICM)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 2.5L 151cid L4 | LX344T | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| UNITED MOTOR PRODUCTS Fits: 2.5L 151cid L4 | DCM9464 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WAI GLOBAL Fits: 2.5L 151cid L4 | DM1929 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WELLS Fits: 2.5L 151cid L4 | 6H1039 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Ignition control modules.
4 Ignition Control Module (ICM) parts for the 1990 Buick Century come from 4 brands — STANDARD MOTOR PRODUCTS, UNITED MOTOR PRODUCTS, WAI GLOBAL and 1 other brand.
This group includes STANDARD MOTOR PRODUCTS LX344T, UNITED MOTOR PRODUCTS DCM9464 and WAI GLOBAL DM1929 and the remaining parts above.
Ignition Lock Cylinder
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 2.5L 151cid L4 | 924790 | 🇺🇸 US 🇨🇦 CA | with Retaining ScrewChrome | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 2.5L 151cid L4 | US107LT | 🇺🇸 US 🇨🇦 CA | T-SeriesIncludes Lock Cylinder | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 2.5L 151cid L4 | US117LT | 🇺🇸 US 🇨🇦 CA | T-Seriesblack | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Popular Fits: 2.5L 151cid L4 | US107L | 🇺🇸 US 🇨🇦 CA | Includes Lock Cylinder | View on Amazon |
| WELLS Popular Fits: 2.5L 151cid L4 | 4H1018 | 🇺🇸 US 🇨🇦 CA | Finish: Black Textured Plastic | View on Amazon |
| GM GENUINE Fits: 2.5L 151cid L4 | 19356477 | 🇺🇸 US 🇨🇦 CA | Chrome Ignition Locks | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 2.5L 151cid L4 | US117L | 🇺🇸 US 🇨🇦 CA | blackIncludes Lock Cylinder | View on Amazon |
| WELLS Fits: 2.5L 151cid L4 | 4H1019 | 🇺🇸 US 🇨🇦 CA | Bright | View on Amazon |
This table covers the lock cylinders in the ignition switch.
8 Ignition Lock Cylinder parts for the 1990 Buick Century come from 4 brands — STANDARD MOTOR PRODUCTS, WELLS, DORMAN and 1 other brand. The "Popular" part is STANDARD MOTOR PRODUCTS US107L.
The Economy section: 3 options from STANDARD MOTOR PRODUCTS and DORMAN. DORMAN 924790 is listed in this group.
Standard Replacement: 5 parts, from STANDARD MOTOR PRODUCTS, WELLS and GM GENUINE. A representative part number is STANDARD MOTOR PRODUCTS US107L.
Listed part numbers: STANDARD MOTOR PRODUCTS US107L, DORMAN 924790 and STANDARD MOTOR PRODUCTS US107LT, plus the other parts above.
Ignition Lock Housing
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 2.5L 151cid L4 | US165L | 🇺🇸 US 🇨🇦 CA | with Tilt Steering Wheel | View on Amazon |
This table covers the Ignition Lock housings.
One part is listed for the 1990 Buick Century — STANDARD MOTOR PRODUCTS US165L.
Spark Plug
Summary: Notes include pre-set gaps of 0.039", 0.040", 0.044", 0.045", 0.054", 0.060" and 0.061". Replacement brands in this table include ACDELCO, DENSO and BOSCH.
Copper / Nickel
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO Popular Fits: 2.5L 151cid L4 | R45TSX | 🇺🇸 US 🇨🇦 CA | GM Original EquipmentConventional | View on Amazon |
| CHAMPION Popular Fits: 2.5L 151cid L4 | 18 | 🇺🇸 US 🇨🇦 CA | Copper PlusPre-Set Gap: 0.045" | View on Amazon |
| ACDELCO Fits: 2.5L 151cid L4 | R43TS6 | 🇺🇸 US 🇨🇦 CA | ProfessionalConventional | View on Amazon |
| BOSCH Fits: 2.5L 151cid L4 | 7976 | 🇺🇸 US 🇨🇦 CA | NickelPre-Set Gap: 0.040" | View on Amazon |
| DENSO Fits: 2.5L 151cid L4 | 5037 | 🇺🇸 US 🇨🇦 CA | U-Groove ConventionalPre-Set Gap: 0.060" | View on Amazon |
| NGK Fits: 2.5L 151cid L4 | 2248 | 🇺🇸 US 🇨🇦 CA | V-PowerPre-Set Gap: 0.060" | View on Amazon |
Double Platinum (lasts up to 3x longer than Copper / Nickel)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO Fits: 2.5L 151cid L4 | 41816 | 🇺🇸 US 🇨🇦 CA | ProfessionalDouble Platinum | View on Amazon |
| AUTOLITE Fits: 2.5L 151cid L4 | APP666 | 🇺🇸 US 🇨🇦 CA | Autolite | View on Amazon |
Iridium (lasts up to 4x longer than Copper / Nickel)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BOSCH Fits: 2.5L 151cid L4 | 9659 | 🇺🇸 US 🇨🇦 CA | OE Fine Wire Double IridiumPre-Set Gap: 0.054" | View on Amazon |
| DENSO Fits: 2.5L 151cid L4 | 5331 | 🇺🇸 US 🇨🇦 CA | Iridium PowerPre-Set Gap: 0.044" | View on Amazon |
| DENSO Fits: 2.5L 151cid L4 | 4716 | 🇺🇸 US 🇨🇦 CA | Iridium TTPre-Set Gap: 0.040" | View on Amazon |
| NGK Fits: 2.5L 151cid L4 | 7272 | 🇺🇸 US 🇨🇦 CA | Iridium IXPre-Set Gap: 0.060" | View on Amazon |
| SKP Fits: 2.5L 151cid L4 | SP1044 | 🇺🇸 US 🇨🇦 CA | Tapered Ground Electrode with Platinum Chip | View on Amazon |
Platinum (lasts up to 2x longer than Copper / Nickel)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO Popular Fits: 2.5L 151cid L4 | 1 | 🇺🇸 US 🇨🇦 CA | GoldRapidfire | View on Amazon |
| BOSCH Popular Fits: 2.5L 151cid L4 | 6708 | 🇺🇸 US 🇨🇦 CA | OE Fine Wire PlatinumPre-Set Gap: 0.054" | View on Amazon |
| ACDELCO Fits: 2.5L 151cid L4 | 88901022 | 🇺🇸 US 🇨🇦 CA | PLATINUM PLUG | View on Amazon |
| CHAMPION Fits: 2.5L 151cid L4 | 2079 | 🇺🇸 US 🇨🇦 CA | Gold PlugCUSTOM | View on Amazon |
| DENSO Fits: 2.5L 151cid L4 | 4510 | 🇺🇸 US 🇨🇦 CA | Platinum TTPre-Set Gap: 0.040" | View on Amazon |
This table covers the spark plugs for this engine. Typical signs include misfire under load, rough idle, or a flashing check-engine light. Verify the gap even on pre-gapped plugs, and replace coil boots that come off a high-mileage engine.
18 Spark Plug parts are listed for the 1990 Buick Century, from ACDELCO, DENSO, BOSCH and 4 other brands. ACDELCO R45TSX carries the "Popular" badge.
In the Copper / Nickel grade, ACDELCO, CHAMPION, BOSCH and 2 other brands supply 6 parts: grouped under the catalog's "Copper / Nickel" designation — the notes column spells out what sets them apart. A representative part number is ACDELCO R45TSX.
In the Double Platinum (lasts up to 3x longer than Copper / Nickel) grade, ACDELCO and AUTOLITE supply 2 parts: grouped under the catalog's "Double Platinum (lasts up to 3x longer than Copper / Nickel)" designation — the notes column spells out what sets them apart. A representative part number is ACDELCO 41816.
The Iridium (lasts up to 4x longer than Copper / Nickel) section lists 5 options from DENSO, BOSCH, NGK and 1 other brand — grouped under the catalog's "Iridium (lasts up to 4x longer than Copper / Nickel)" designation — the notes column spells out what sets them apart. BOSCH 9659 is listed in this group.
In the Platinum (lasts up to 2x longer than Copper / Nickel) grade, ACDELCO, BOSCH, CHAMPION and 1 other brand supply 5 parts: grouped under the catalog's "Platinum (lasts up to 2x longer than Copper / Nickel)" designation — the notes column spells out what sets them apart. A representative part number is ACDELCO 1.
Spark Plug Non-Fouler
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 2.5L 151cid L4 | 42006 | 🇺🇸 US 🇨🇦 CA | 14mm Tapered Seat | View on Amazon |
This table covers the non-foulers that space a spark plug away from oil fouling.
This group shows a single part: DORMAN 42006.
Spark Plug Wire
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PROFESSIONAL'S CHOICE Fits: 2.5L 151cid L4 | 2950 | 🇺🇸 US 🇨🇦 CA | Set | View on Amazon |
Premium
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NGK Popular Fits: 2.5L 151cid L4 | 51235 | 🇺🇸 US 🇨🇦 CA | Set | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 2.5L 151cid L4 | 7432 | 🇺🇸 US 🇨🇦 CA | SetStandard® Premium | View on Amazon |
| UNITED MOTOR PRODUCTS Fits: 2.5L 151cid L4 | 749 | 🇺🇸 US 🇨🇦 CA | Permashield-Delcore or United-PackardSet | View on Amazon |
| UNITED MOTOR PRODUCTS Fits: 2.5L 151cid L4 | 7419 | 🇺🇸 US 🇨🇦 CA | United-PackardSet | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Popular Fits: 2.5L 151cid L4 | 27432 | 🇺🇸 US 🇨🇦 CA | Pro SeriesSet | View on Amazon |
| WALKER PRODUCTS Fits: 2.5L 151cid L4 | 9241229 | 🇺🇸 US 🇨🇦 CA | Direct FitSet | View on Amazon |
This table covers the Spark Plug wires.
7 Spark Plug Wire parts for the 1990 Buick Century come from 5 brands — STANDARD MOTOR PRODUCTS, UNITED MOTOR PRODUCTS, PROFESSIONAL'S CHOICE and 2 other brands. The "Popular" part is NGK 51235.
The Economy section: 1 option from PROFESSIONAL'S CHOICE. PROFESSIONAL'S CHOICE 2950 is listed in this group.
Premium: 4 parts, from UNITED MOTOR PRODUCTS, NGK and STANDARD MOTOR PRODUCTS. A representative part number is NGK 51235.
Standard Replacement: 2 parts, from STANDARD MOTOR PRODUCTS and WALKER PRODUCTS. A representative part number is STANDARD MOTOR PRODUCTS 27432.
Part numbers include NGK 51235, PROFESSIONAL'S CHOICE 2950 and STANDARD MOTOR PRODUCTS 7432, among others listed above.
Tune-Up Kit
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| UNITED MOTOR PRODUCTS Fits: 2.5L 151cid L4 | 37419 | 🇺🇸 US 🇨🇦 CA | Includes Fuel Filter PCV and Wire SetUnited-Packard | View on Amazon |
This table covers the Tune-Up kits.
This group shows a single part: UNITED MOTOR PRODUCTS 37419.
Buying Ignition Parts for a 1990 Buick Century
On this vehicle, the ignition system delivers spark at the right moment — plugs, coils, wires, distributors and ignition modules.
- Match the engine first. Every ignition part here is engine-specific; each row shows which engine(s) it fits.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace plugs and wires (or coil boots) as a set — one weak cylinder makes the whole set feel bad.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Spark Plug and Ignition Coil .
Frequently Asked Questions
How many ignition parts fit the 1990 Buick Century?
Our catalog currently lists 63 ignition parts for the 1990 Buick Century across 13 subcategories and 23 brands, covering both the 2.5L 151cid L4 and the 3.1L 189cid V6. Each part is matched to the engine(s) it fits.
Do ignition parts differ between 1990 Buick Century engines?
Yes. Every ignition part on this page is engine-specific. Each row shows which engine(s) it fits — use the filter at the top to hide the rest. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of ignition problems on a 1990 Buick Century?
Common symptoms include misfires under load, rough idle, flashing check-engine light, or poor starting in damp weather. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What spark-plug gap is listed for the 1990 Buick Century?
Notes on this page include pre-set gaps of 0.039", 0.040", 0.044", 0.045", 0.054", 0.060" and 0.061". Still verify against spec — even “pre-gapped” plugs should be checked before they go in.
What should I replace at the same time?
Where labor overlaps, replace plugs and wires (or coil boots) as a set — one weak cylinder makes the whole set feel bad.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 1990 Buick Century was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 1990 Buick Century?
First match the engine — each row shows which engine(s) the part fits. Then gap matters even on “pre-gapped” plugs — verify against spec, and replace coil boots when they come off a high-mileage engine. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 1990 Buick Century
Ignition Parts for Other Buick Century Years
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