Dilomber Idle Air Control Valve for Mercury Outboard 65–150HP — Replaces OE 8M0188118, Restores Stable Idle

The Dilomber 897526T idle air control (IAC) valve restores stable idle and smoother throttle response on compatible Mercury 4-stroke outboard engines.

Designed to replace OE part 8M0188118, this aftermarket IAC valve fits a wide range of Mercury EFI outboards from 65HP up to 150HP. Built with factory-grade materials and inspected for quality, the unit helps regulate airflow to the intake at idle and low-load conditions so the engine maintains consistent RPMs. The following details explain fitment, function, installation considerations, and who benefits most from this replacement part.

Which Mercury outboard models and serial ranges does this IAC valve fit?

This Dilomber part is engineered to match the listed Mercury 4-stroke EFI models and serial ranges noted by the manufacturer. Always cross-check your engine’s serial number and OEM part reference before purchasing to ensure compatibility.

• Replace part numbers: 897526T and 8M0188118.
• Fits 65HP EFI Jet (s/n 2B095049 & up) and multiple 75–115HP EFI ranges.
• Included fitment for 90HP SeaPro, 100 Vazer/Vazer EC, 115 Pro XS/SeaPro, 135HP and several 150HP EFI variants.

How does the IAC valve affect idle and throttle response?

The IAC valve controls small amounts of bypass air around the throttle plate at idle and during rapid throttle changes. Proper operation stabilizes RPMs during load fluctuations, improves cold-start idling behavior, and reduces stalling risk under sudden loads.

• Regulates idle airflow to maintain steady RPMs.
• Assists in smoother transitions when opening the throttle.
• Minimizes surge or stalling at low engine speeds.

What should I expect when installing this replacement part?

Installation is typically straightforward for technicians familiar with Mercury EFI outboards; it requires basic hand tools and attention to gasket or seal condition. Inspect wiring connectors and throttle body mating surfaces, and follow torque specs where applicable to avoid damage or vacuum leaks.

• Verify engine serial number and OEM reference before fitting.
• Check electrical connector and replace worn gaskets or seals.
• Test idle and throttle response after installation, and clear any stored codes if present.

What quality and after-sale notes should I be aware of?

Dilomber units are produced under factory processes and undergo quality inspection before shipping, delivering consistent performance for typical marine use. If the product arrives damaged, inspect packaging and follow the seller’s return policy for a replacement or refund.

• Manufactured with attention to fit and functional stability.
• Inspect upon receipt and report transit damage immediately.
• Keep original packaging and order information for returns.

Who is this for: This Dilomber 897526T IAC valve is intended for boat owners, marine mechanics, and service shops maintaining Mercury 4-stroke EFI outboard engines in the 65–150HP range who need a direct-fit replacement for OE 8M0188118. It’s suited to those troubleshooting unstable idle, rough low-speed throttle behavior, or following routine maintenance to restore proper idle airflow control. Always confirm engine serial numbers and consult a qualified technician if you’re unsure about fit or installation.