![]() This won’t cause cold stalling, but it can make for a rough idle, once the engine warms up. If the coolant sensor reads, colder than normal or cold all the time, the engine will run rich. A faulty sensor (or sensor circuit) will often cause, cold driveability and emission problems. Then, that can confuse the fuel mixture results. If the coolant sensor is bad, and tells the (PCM) the engine is colder or warmer than it really is. A Bad Engine Coolant Temperature (ECT) Sensor If no wiring faults are found, you may have to replace, the idle speed control solenoid. If a good soaking with cleaner, fails to fix the stalling problem, check the wiring connector. ![]() However, cleaning the idle air bypass circuit in the throttle body, with aerosol throttle cleaner, will often remove the gunk. Replacing the solenoid valve, may then be the best course of action for this repair job. If the idle air bypass circuit, is clogged with dirt or fuel varnish, or the solenoid valve is sticking or broken, the engine may not get enough air to idle normally, causing it to stall. The result is, that it cannot be smoothly controlled. ![]() The most common failure, is partial or complete jamming of the actuator (due to dirt, dust or even oil). Idle speed on a fuel injected engine, is controlled by letting a small amount of air to bypass the throttle. Fuel pressure, should be within specs, with key on, then drop 4 to 6 psi once the engine starts. Next, measure the pressure with the key on, engine off, then again with the engine idling. Look up the specs for the year and model of the vehicle, then connect a gauge to the fuel system. The first thing to check, would be fuel pressure. But, as with the idle speed control circuit, don’t replace anything, until you’ve run some diagnostic tests. If the vehicle is more than seven or eight years old, the fuel pump would certainly be suspect. The most likely cause would be, a fuel pump that is not turning fast enough or is intermittently cutting out. This could be from, not enough fuel pressure, to keep it running. If the engine stalls, while idling or driving, the engine may be running out of fuel. Cleaning the air flow sensor wire with aerosol electronics cleaner, can often restore normal operation and cure the problem. This can upset the air/fuel mixture causing, idle, stalling and hesitation problems. It will be slow to react, to changes in air flow as well. Hesitation and jerking, during acceleration.Ī sensor that has been contaminated by fuel, varnish or dirt, will under report air flow. ![]()
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