Can PCV cause misfire?
The PCV valve hose may have a leak in it, which is causing the hissing sound. Leaving this for too long can cause misfires, rough running, vacuum leaks and you will have a more extensive repair on your hands.
Can a bad PCV valve cause slow acceleration?
A PCV valve that’s supposed to regulate the flow of these gases is the heart of most PCV systems (some newer vehicles don’t have a PCV valve). If the valve doesn’t open and close on schedule, or if any part of the system clogs, the result can be a rough idle, sluggish acceleration or increased oil consumption.
What kind of hesitation does a car have?
Experiencing severe hesitation when starting up from a stop and when accelerating while at lower speed. When engine is cold hesitation is minimal but as soon as engine reaches normal operating temperature. Hesitation is always so bad that I have to be careful pulling into traffic to avoid getting rear-ended.
What happens when you hesitate at the throttle?
5) While driving at normal road speeds (after the hesitation) or accelerating and the throttle is not fully closed, there is no miss whatsoever, and the engine performs very smoothly. While ever the throttle is partially or full open, the engine performs very smoothly and with normal power, apart from the initial hesitation.
Why does my car hesitate when I start up?
Rough idle on initial start up in the morning, then clears up, then hesitates slightly on acceleration from a complete stop after that. I have changed coil packs, spark plugs, MAF and O2 (upstream) sensors, and added a fuel injector cleaner. Still have idle and hesitation problems.
When is hesitation overcome, acceleration is in pulses?
Once hesitation is overcome and car begins to accelerate, acceleration is always in pulses. Even going up-hill with a steady foot on throttle just to maintain speed, acceleration is pulsing. new MAF, new TPS, new fuel injectors, fuel pressure checked, good, new PCV.
Why does my car hesitate when I step on the accelerator?
Instead of going faster by stepping on the accelerator pedal, the speed will be reduced. The vehicle may even stumble entirely during these seconds. This is what it means when the car engine hesitates. It is usually the result of a problem with the air and fuel mixture within the combustion chamber.
Can a bad idle control valve cause stalling?
3. Engine stalling The idle control valve, also commonly referred to as the idle air control valve, is an engine management component that is found in one form or another on the majority of road going vehicles.
What are the symptoms of an idle air control valve?
One of the most common symptoms commonly associated with a problematic idle air control valve is irregular idle speed. The idle air control valve is programmed to regulate and maintain the engine idle speed at a constant rate.
How to troubleshoot a hesitating or bucking car?
Step 1: Physically inspect the fuel filter. If the fuel filter is dirty like the image on the right, it’s probably causing a restriction of fuel flow to the engine and should be replaced. Step 2: Check for leaks coming from fuel filter connections. The fuel line is spliced between two fuel lines.
If the PCV valve did not regulate air flow, the engine would act like it had a vacuum leak. Too much air flowing into the intake causes the engine to lean out [too much air in relation to the fuel] and misfire. At an idle, the PCV valve restricts air flow, to reduce this problem.