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It’s tasked with opening the throttle plate just the right amount, too much and the engine runs lean, too little and she’s running rich.

The stepper does all the heavy lifting, it’s a precision kit. The throttle pedal no longer has a cable attached instead sends a proportional voltage to the onboard computer, the PCM (Power-train Control Module). With the computer age came the fly-by-wire. Pressing the gas pedal caused a direct physical movement of all this hardware. Rods, cables, and levers working in harmony. Once all throttle assemblies were a full mechanical affair. In this post, you’ll learn how to clean your throttle body, and I’ll share a few tips along the way. I’m a mechanic for more than twenty years, I’ve cleaned more throttle bodies than I count. Throttle body cleaner is formulated to help break down carbon and other fuel-related deposits on a throttle body. WD40 won’t be an effective throttle body cleaner, hard deposits stuck to the throttle body and throttle plate will require a throttle body solvent. Cleaning shouldn’t take more than thirty minutes and before long she’ll be on full song. Erratic idling and stalling issues are so irritating, you’re on the right track, a dirty throttle body could be the root cause.