Rpm drops when letting off gas?
Video answer: Rpm bounce when i let off gas
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Common Reasons For A Bouncing Rpm
- Faulty Fuel Injectors. A fuel injection system consists of tiny injectors…
- Faulty Spark Plugs. Spark plugs help burn the fuel mixture, generating power to run the engine…
- Defective Fuel Pump…
- Defective Idle Air Control Valve…
- Dirty Air Filters…
- Vacuum Problem…
- Faulty Electrical Components…
Video answer: Rev problem
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How Does RPM Work? Upon letting off the gas, the RPM of a car should slowly drop to the fixed idle position. This constant idle RPM is usually 1000 RPM. In some vehicles, it can be 1500, but it should be constant when you let off the gas. In some cars, it can drop to 800 RPM. An RPM below 800 is called low RPM.
I have a 1999 Dodge Intrepid 2.7L V6 that dies every time I stop pressing the gas pedal. Sometimes it will idle for a few minutes while in park, but as soon as it's put into drive it'll die if I don't keep on the gas slightly. It will die no matter what speed I'm going. I've had it shut off on me while going 55mph on the highway.
Sometimes, but not always, after holding the throttle at a certain RPM and letting off the gas the RPM's would drop. As well, after the engine has been running for a long period, at least a half an hour, when the car is stopped the engine would "shake" every 10 seconds or so and I can feel it in my seat. It is not as violent as it sounds.
I bought it off my mom and she drives like a grandma! All mods were done within a month of me buying it and never had this problem till 2 or 3 months ago. Doesn’t matter if I’m going 10 mph or 70 mph as soon as I take my foot off the gas (not to brake just letting off the gas) depending on speed determines whether it drops a little or a lot just for a second and then shoots back up to where it was when I let off.
I’m experiencing big RPM drops when I let the gas pedal off! For example when I drive 80KM (60MPH) RPM is about 2300. As I leave the gas pedal, RPM drops to 1500 and it makes annoying engine brake. I washed throttle body and idle control valve but it still does the same thing.
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.
Please check out this video where my rpms drop then quickly rise when letting off the gas. I had to exaggerate touching the gas for the video. You can see when I let off the gas, the rpms quickly go down near idle and push back up a few hundred immediately. It’s not a downshift and I can feel it sometimes so it’s not the cluster.
The rpms jump about 200-400 one time after letting off the gas and it only does it at cursing speeds above 30 or so, it happens almost 100% of the time at 45mph cruising. And is 12.85v charging voltage at idle low for this car?
This problem seems to be solved for me. The problem was that at city speeds, if I let off the gas, it would drop off to about 1000 RPMs and then surge back to 1400 or so. Now it doesn't seem to do that and simply drops to 1400, thus avoiding the usual lurch.
My problem is, when I am holding gas pedal, and cruising along, the RPMs are fine, when I release the gas pedal, to prepare for a stop, the RPMs go shoot down to about 1K, then shoot back up, to where they were previously Sometimes this is accompanied with a slight jerking movement of the car, as if I tapped the brake (not being hit on accident).