Hi There, It sounds like you may have a dirty or faulty idle air control valve or potentially
a bad fuel pressure regulator or fuel pump.
Not exact matches
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This may be due to a stuck float not allowing the needle valve to open right, or if
fuel pressure was
bad it may not be keeping up with demand.
While I was writing the edit, I remembered a video I saw a while back that has a great functional explanation of how the
fuel injectors work and why low
fuel pressure is
bad for them.
It suddenly got so
bad I decided to check
fuel pressure once again... FINALLY, the leak - down test is showing a massive drop in
pressure, from 60 to 20 psi within seconds.
This time the failure was not due to a
bad HPFP (high
pressure fuel pump).
It's throwing codes for
fuel pressure, do the high
pressure fuel pump and follows go
bad in the 2013's?
The technicians explanation was that the
fuel pressure sensor pump starts to fail off either due to arcing, or just pure
bad connections sending erroneous data to the computer.
The high
pressure fuel pumps on these cars are known to go
bad.
It can also mean there is less
fuel than usual such as a weak
fuel pressure, dirty
fuel injectors,
bad O2 giving computer a
bad reading so
fuel is lessened,
bad engine coolant temperature sensor giving computer a hot reading so
fuel is lessened.
If it does leak down then the
fuel pump internal check valve is
bad and
fuel pump needs replaced if the
pressure now stays up and does not leak down then the
fuel pressure regulator has a leaking
pressure seat and needs to be replaced.
Either you have a blocked exhaust like a
bad converter, a muffler clogged from a broken up converter, or you have a
bad ignition module or
fuel pressure problem.
This can happen for a variety of reasons ranging from low
fuel pressure to
bad injector pulse to even just a dirty...
This may be caused by many things such as low
fuel pressure, a
bad mass air flow sensor or a faulty idle air control valve.
The most common would be a
bad fuel filter, transmission fault, torque converter issue, shift solenoid problem, low
fuel pressure, or a failed
fuel injector.
Weak
fuel pressure (could be caused by a faulty
fuel filter or
fuel pressure regulator)
bad crank position sensor,...
Also, because of
fuel - consumption
pressures, the left - foot braking common in Formula 1 is considered
bad form here.
A loss in power and poor
fuel economy can be caused by lots of things — ignition components,
fuel pressure, engine temperature, restricted injectors, a
bad air - flow meter and plenty more.
Examples of vacuum leaks include: leaking intake manifold gasket, broken PCV valve or PCV hose, disconnected vacuum line, cracked vacuum line, ripped intake snorkel - faulty
fuel injector - damaged engine computer (PCM)- low
fuel pressure - leaking head gasket - low compression in the affected cylinder - valves that are out of adjustment -
bad mass airflow sensor (random misfire).
The
worst bully on the block is the Heartland Institute, a fossil -
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pressure group based in Chicago.
A lot of things have an influence on the
fuel economy of a car: Driving style, weather (mileage can drop quite a bit during winter), tire
pressure (we wrote about that),
badly tuned engine, carrying unnecessary weight in the car, idling, cold engine & catalytic converter, etc..
But tire
pressure does matter, because underinflated tires are
bad for
fuel efficiency and handling, and they have a bigger risk of a blowout.