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An engine may backfire at high idle due to a variety of factors, including an incorrect air-fuel mixture, which can result from a malfunctioning fuel injector or clogged fuel filter. Additionally, ignition timing issues, such as a faulty spark plug or ignition coil, can cause unburned fuel to ignite in the exhaust system. Vacuum leaks and exhaust system blockages can also contribute to this problem. Addressing these issues typically requires a thorough inspection of the fuel and ignition systems.
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What causes an engine to backfire through intake coming off idle?
Out of time.
What causes high engine idle and surges in the 1989 Corvette?
The cause of high engine idle and surges in the 1989 Corvette is due to..Read More
What causes a 350 Chevy engine to backfire at idle and when decelerating?
That usually means it's lean. Check all vacuum lines and gaskets for leaks.
What causes a 1998 Chevrolet 305 engine to idle high?
Check throttle positioning sensor.
Why do you have small idle backfire and high speed lag?
The inlet manifold is leaking air, weakening the mixture, OR the engine timing/sparkplug electrode gap is outside specified limits.
What causes the ignition not to turn off the engine in a 1972 Plymouth?
engine idle set too high or the timing is off and needs reset.
What causes the vehicle to lunge forward or backward when the transmission is placed in drive or reverse?
Engine idle too high.
What causes low idle in the engine on a 2002 kia sportage?
low idle and uneven idle
What causes high idle and then rough high idle when heater is turned on?
Vacuum leek
What does a vacuum leak do to a 1998 Plymouth neon espresso?
High idle, misfire, check engine light,High idle, misfire, check engine light,
Dodge 318 engine noise knock at idle?
Added info to question: Vacuum also coincidently went from steady 20psi to 15psi/knock - small backfire/miss on acceleration from idle. Knock is steady at idle.
What causes car to idle up high?
There are several things that can cause high idle. An older carbureted engine may have a vacuum leak or sticking choke linkage. Newer computer controlled engines have an idle control device called an idle motor which could be faulty or receiving bad information from other sensors on the engine ( IE. temperature sensor ).
