car revs up and down while driving

Can you help Please may car malibu 2016, 20T. failure. I have hyundai tucson 2009.at 90km speed the RPM reached 3..with loud engine sound. the clutch pedal is at the top of its travel with no free-play, this is a sign the

Step 2 - An engine's tune up is a regularly scheduled service, when this

Even cruising at low speeds, it comes on and off. Step 7 - If a catalytic converter fails it can break apart causing partial blockage of the exhaust system.

High engine speeds won’t harm a healthy engine.

When I start the engine rpm was was too high even the gear was parking. If your car is over 15 years old, suspect the main ECU capacitors.

device that incinerates unburnt gases in the exhaust system. Fluff me! About 137,000 miles I've only had it for a few months. failure. Its also going to be a pain to have to wait to get one or have the car towed should it work.

If the engine runs smoothly after this, the IAC is defective and must be replaced.

Second mechanic quoted $767 + $60 if the fan belts need replacing.

and if your low on coolant, that IAC isnt seeing any coolant, so it doesnt have any idea what to tell your ecu. It accelerates normal. Take it to the mechanic. The air intake boot transfers engine intake air volume Step 5 - If a vacuum line has caused a leak the engine will maf- mass air flow sensor tells ecm how much air is coming into intake manifold . Have you recently replaced the timing belt on your engine? Tuning up the engine might also boost the performance in a great way. (adsbygoogle = window.adsbygoogle || []).push({}); While driving my pick up, the engine will race and seems like it is trying to shift gears, up or down. Only does it when the car isn’t moving.

clutch assembly is worn. make sure air filter ,wire mesh inside maf sensor is nit dirty,pluged ect.although this is only 1 sensor u describe symtoms to a "t"....'http://treperformance.com/i-5923397-chevy-camaro-z... why would bad spark pulgs or wires be stupid? Learn more

Another option which I have used before was an analogue multimeter.

device that incinerates unburnt gases in the exhaust system.

Learn more. transmission wear they can momentarily slip which causes a surging sensation. On some vehicles (especially drive by wire vehicles), “light gas” could be close to wide open throttle. transmission wear they can momentarily slip which causes a surging sensation. As someone who has spent HEAPS of time working on 626's, I think I can be of some use here.

So it turned out the fluctuating idle was due to low coolant levels. The car doesn't increase speed. When an engine's computer can "hunt" or "surge" at cruising or idle speeds it is searching for program compliance, there is a problem elsewhere in the system. Here's the specifics: - It only seems to do it between 30-50 mph - It only does it while I am trying to hold a constant speed (not accelerating / decelerating - The tachometer shows the engine surging up about 1-200 rpm

Learn more This could result in an abundance of air mixing with the gasoline, which would result in a misfire. It helps warm up the catalytic converter. cause the engine to surge. Carburetors were previously used in vehicles before fuel injectors were invented. If the belt skipped a tooth, it would certainly cause a rough idle. Check engine lite,,it means something more than loose gas cap,. Step 6 - If an air intake boot becomes torn and develops a leak it will Smart Car MPG – What Kind of Gas Mileage Can You Expect? There are a lot of hoses that help deliver both fuel and air to the internal combustion chamber. I would do some more testing before throwing any more parts at it.

It was random and when it happened it lasted for weeks then suddenly stopped. into the throttle actuator.

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