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High idle at startup. Report Follow. Mark helpful. Your Answer:. Upload Photo Photo optional. Related Questions. Start a new Jeep Grand Cherokee question. Own this car? Share your experience with others. Write a car review. Search Jeep Grand Cherokee Questions. CarGurus Experts. Know more, shop wisely Search. Loosen the lock-nut on the kickdown cable with an adjustable wrench. Turn the idle screw, now exposed from the protective rubber coating, in order to adjust the idle.
Loosen the screw in a counter-clockwise fashion to increase idle speed or tighten it in a clockwise manner in order to decrease the idle speed.
Ideally, you will want the idle to rest at RPM. A dirty air filter prevents the necessary volume of clean air from reaching the engine which affects the emission control systems of the car; reducing air flow and causing a too rich air -fuel mixture which can foul the spark plugs. Fouled spark plugs can create an engine miss, rough idle and even starting problems. Plus, excessive idling can damage your engine's components, including spark plugs, cylinders and exhaust systems.
Because your vehicle's engine is not operating at its peak temperature when idling, fuel is only partially combusted, leading to a fuel residue buildup on cylinder walls. If this system is not functioning properly, the fast idle could remain on even after the engine is warm causing it to overheat.
High RPM causes more wear on the engine components than lower revs. Every engine has a point where it will come apart internally at a certain speed. It is subject to first, valve spring tension, preventing valve float. Then you have connecting rod and crankshaft limitations. Resistance should be ohms. Using an ohmmeter, measure the resistance between pins 1 and 2 on the IAC valve. Perfect for use in cold weather or in applications where a PTO is needed, this switch taps into factory wiring and provides multiple idle speeds.
You hear a squealing or sucking sound from the engine: A vacuum leak can sound just like the end of the tube on your home vacuum cleaner. If you hear a sucking noise from under your hood, you likely have a vacuum leak. How do you adjust the idle on a Jeep Grand Cherokee? Category: automotive auto parts. Turn clockwise to increase idle speed, counterclockwise to decrease idle speed. How do I reset my idle speed? To reset the IAC valve pintle position proceed as follows:. If there is no RPM gauge but the engine sounds like it is turning faster when idle, a mechanic can use an instrument to measure the actual engine speed.
Harsh engagement in drive. If the idle speed is too high, the vehicle will jump forward when placed in drive. Excessive brake effort is required to hold vehicle at a stop. If idle speed is normal, only a very light force on the brake pedal will be necessary to prevent forward motion in drive. How do mechanics adjust or repair incorrect idle speed? Is it safe to drive with incorrect idle speed? When addressing idle speed issues, keep in mind: Related functions, such as the idle up function when the air conditioner is turned on, will be inspected by a mechanic during the repair of a high idle problem.
Prior to replacing parts, such as the throttle body, the mechanic will also need to rule out electrical causes of incorrect idle speed as well as physical causes such as vacuum leaks. Number of Jeep Grand Cherokee services completed. Yourmechanic was featured in. Popular Jeep Jobs. Auto service in Your City. Meet some of our expert Jeep mechanics Real customer reviews from Jeep owners like you. Excellent Rating. Rating Summary. Rodney 36 years of experience.
Request Rodney. Jeep Grand Cherokee V Very professional and friendly. Explain to you what the problem and what he did. Jose 43 years of experience. Request Jose.
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