Johnsen's 4724 Throttle Body and Air Intake Cleaner
Priced as of May 20, 2026
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Prices may varyAbout this product's hazards. This product's Safety Data Sheet uses signal word danger. Read the manufacturer's SDS and follow all safety instructions before use. CarCareTruth ratings translate SDS data — they do not replace the SDS or substitute for a hazard assessment specific to your task.
From the Safety Data Sheet
Full SDS ↗ (rev. 2017-02-09)GHS hazard codes are quoted from the manufacturer’s Safety Data Sheet. PPE tiers below translate those codes and the listed ingredient chemistry; they are not CarCareTruth recommendations.
EyesSituationalMfr. SDS §8 · 29 CFR 1910.133(a)(1) · GHS H319SkinRecommendedMfr. SDS §8 · 29 CFR 1910.138(a) · GHS H315LungsRequiredMfr. SDS §8 · 29 CFR 1910.134 · GHS H373Ventilation—No PPE in published sourcesShow details for all categories ▾Hide details ▴
From the manufacturer’s Safety Data Sheet, Section 8
“H319 (eye irritation Cat 2A) confirmed in SDS §2 mixture classification. Aerosol mist during throttle-body spray is the chemistry-mapped trigger for temporary eye irritation.”
— Johnsen's
U.S. regulatory standard
29 CFR 1910.133(a)(1)
“The employer shall ensure that each affected employee uses appropriate eye or face protection when exposed to eye or face hazards from… liquid chemicals…”
ANSI Z87.1 (incorporated via §1910.6)
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
From the manufacturer’s Safety Data Sheet, Section 8
“H315 (skin irritation Cat 2) confirmed in SDS §2 mixture classification. SDS §8 lists nitrile as hand protection.”
— Johnsen's
U.S. regulatory standard
29 CFR 1910.138(a)
“appropriate hand protection when employees' hands are exposed to hazards such as those from… chemicals which produce an adverse effect on the skin or eyes…”
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
From the manufacturer’s Safety Data Sheet, Section 8
“DANGER signal word driven by health H-codes at §2 mixture level (H336 narcosis, H361, H373). SDS §8 specifies an organic-vapor cartridge where vapor exposure occurs. SDS §7 directs use in a well-ventilated area.”
— Johnsen's
U.S. regulatory standard
29 CFR 1910.134; 1910.138; 1910.1000
“the primary objective shall be to prevent atmospheric contamination…”
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
UN GHS hazard statement
H373“May cause damage to organs through prolonged or repeated exposure”
UN GHS Rev. 9 (2021)
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
The published Safety Data Sheet for this product does not specify ventilation protection for consumer use.
Workplace context
29 CFR 1910.134(a); 1910.1000
“the primary objective shall be to prevent atmospheric contamination [via] accepted engineering control measures (for example, enclosure or confinement of the operation, general and local ventilation…).”
Triggered by GHS H336 on the SDS.
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
PPE tiers translate the manufacturer’s SDS and U.S. regulatory standards. Not professional safety advice. How we report safety.
CarCareTruth's Analysis
Last reviewed May 20, 2026
TL;DR Aggressively formulated aerosol for throttle-plate carbon and air-intake deposits. No O2-sensor-safe or cat-safe claim on the label — and high-aromatic solvent content is the chemistry that disqualifies a formula from those claims. DANGER from health H-codes (suspected reproductive toxin H361, organ-damage risk H373) plus a Prop 65 warning on the label. SDS §8 specifies an organic-vapor cartridge for vapor exposure; SDS §7 directs use in a well-ventilated area.
What it is and how it performs
Remove the intake duct, hold the throttle plate open, spray into the bore, and wipe down. Fast-evaporating formula leaves no residue. No Amazon reviews at scoring time and no forum before/after documentation found — performance is rated from formula chemistry and brand claims. Use short bursts; excess solvent pooled in the intake will smoke briefly at first start.
Who should buy this — and who should skip it
Workable for a port-injected throttle body with heavy carbon where cleaning power is the priority. Skip it if you need confirmed O2/cat-safe chemistry — no such claim exists here and the aromatic content disqualifies it. Also skip for GDI engines: aerosol TB cleaner can't reach intake-valve carbon.
Safety and environmental impact
DANGER driven by health H-codes: H361 (suspected reproductive toxin), H373 (STOT-RE Cat 2), H336 (narcosis), H315 (skin irritation), H319 (eye irritation). Prop 65 warning on product label. SDS §8 specifies organic-vapor cartridge where vapor exposure occurs; nitrile listed as hand protection; SDS §7 directs well-ventilated area use. VOC 358 g/L (SDS §9); OTC compliant, not CARB. Not biodegradable. n-Heptane carries H400 + H410 at ingredient level — avoid storm drain discharge.
From the manufacturer
Marketing copy from Johnsen's, via Amazon. Not editorial.
- •Formulated for modern fuel injected engines.
- •Cleans fuel injected air intake openings and assemblies; cleans butterfly/throttle valve; helps improve hard starting and performance.
- •Safe on metal intake plastic surfaces, 360° valve ensures product sprays in any position.
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Manufacturer images
Manufacturer specifications
- Brand
- Johnsen's
- Unit Count
- 10.0 Ounce
- Number of Items
- 1
- Global Trade Identification Number
- 00039101006284
- Manufacturer
- Johnsen's
- Size
- 10 Ounce (Pack of 1)
- Brand Name
- Johnsen's
- UPC
- 039101006284
- Model Number
- 4724
- Part Number
- 4724
- Warranty Description
- check with manufacturer Regulararding warranty and support issues.
- Best Sellers Rank
- #2,317,418 in Automotive (See Top 100 in Automotive) #230 in Carburetor & Throttle Body Cleaners
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