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What causes the RPM to drop?
The engine RPM drop when changing gears is often caused by a failed throttle position sensor (TPS). When in use, the cone of the TPS accumulates soot that prevents the correct rod movement. If a TPS works abnormally, the air-fuel mixture will not meet the requirements.
Why does RPM go up and down at idle?
Among the potential underlying causes are vacuum leaks, EGR system malfunctions, malfunctioning oxygen sensors, dirty fuel injectors, fuel pump malfunction, faulty spark plugs, a faulty mass airflow sensor, or a faulty throttle position sensor.
Why do my RPMs drop when I let off the gas?
When you accelerate, the engine RPM increases, and as you let off the gas, the RPM slowly returns to the normal idling speed. However, when the engine RPM drops below the normal range of 800 RPM (for most cars), it is more than likely that you are dealing with an IAC valve problem.
Why is my car stalling when I accelerate?
There are a large number of reasons why your car might stall while driving. It could be a dead alternator, a bad coolant sensor or lack of fuel, just to name a few. Is your car stalling while accelerating? If so, then it could be a major vacuum leak, clogged fuel filter or a bad fuel pump.
What is intermittent stalling?
When a bad module is responsible for an intermittent stalling problem, the engine will usually cold start just fine and run OK for short distances, but stalls after driving more than a few miles or when driving at highway speeds (especially during hot weather). It’s as if somebody suddenly turned off the ignition.
Why is my car RPM not stable?
Failing Electrical Components: A problem or failure in the ignition system or various electronic components can cause a rough idle. If this is the case, the problem will usually get worse as RPMs increase. Common culprits include the ignition control module, plug wires, coils, and spark plugs.
What kind of car is the Mercury Topaz?
The Mercury Topaz is a compact car that was sold by the Mercury division of Ford Motor Company from 1984 to 1994 as a slightly upscale variant of the Ford Tempo. It succeeded the Fox body Mercury Zephyr, and was replaced by the 1995 Mercury Mystique .
When did the Ford Tempo Topaz come out?
Both models were introduced in late 1983 for the 1984 model year; the compact Topaz and Ford Tempo were early examples of the design philosophy that would bring about the revolutionary 1986 Ford Taurus and Mercury Sable. Topaz and Tempo both were based on the Escort-derived CE14 platform.
What was the difference between the Ford Zephyr and the Topaz?
The Topaz had a very aerodynamic design, and unlike its Zephyr predecessor, it was front-wheel-drive. Topaz focused on comfort and convenience, and Ford, by making Topaz FWD made interior space much larger than it would have been if the Topaz and Tempo were rear-wheel-drive.