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What can you do if a new engine has an idle speed at 500rpm steady but not right?

A steady 500 RPM idle on a new engine is likely too low for most vehicles. Most cars need an idle speed closer to 650-850 RPM, depending on the make, model, and engine. Since it's a *new* engine, this isn't a simple "adjust the idle screw" situation. Something is fundamentally amiss. Do not attempt any adjustments yourself. This is a serious issue that could cause damage.

Here's what you should do:

1. Immediately take it back to the installer/dealer/manufacturer: This is a warranty issue. A new engine should not have this problem. Reporting it immediately protects your rights and prevents potential further damage.

2. Explain the symptom clearly: Don't just say "the idle is low." Say "the engine idles steadily at 500 RPM, which is too low, and I'm concerned about potential damage."

3. Document everything: Keep records of the date of installation, the mileage, the problem description, and any communication with the installer/dealer.

Possible underlying causes (that a professional should diagnose and fix, not you):

* Incorrect Idle Air Control (IAC) valve calibration or malfunction: This is a common culprit for incorrect idle speed.

* Vacuum leaks: A leak in the intake system can cause low idle.

* Throttle position sensor (TPS) issue: An incorrectly calibrated or faulty TPS can affect idle speed.

* Problems with the engine control unit (ECU) programming or sensors: The ECU might be misinterpreting sensor data, leading to an incorrectly adjusted idle.

* Incorrect fuel mixture: A lean or rich mixture can affect idle.

In summary: Do not try to fix this yourself. A low idle speed on a new engine is a serious issue that requires professional attention under warranty. Contact the responsible party immediately.

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