Tech Support Forum - View Single Post

djenn434 · 06-28-2008, 10:35 PM

Spark Plugs -
Worn, faulty, fouled or incorrect spark plugs can cause a misfire or rough idle.

Timing Belt -
A misaligned timing belt can cause a misfire or rough idle.

Engine Mechanical -
Mechanical engine problems can cause a misfire or rough idle.

Exhaust Gas Recirculation (EGR) Valve, If Equipped -
An EGR valve that is stuck open can cause a misfire or rough idle.

Overlooked Causes

Grounds -
Poor engine control module (ECM) grounds or sensor grounds can cause the ECM to miscalculate fuel delivery and cause a rich condition resulting in a misfire or rough idle.

06-28-2008, 10:35 PM	#2 (permalink)
djenn434 Registered User Join Date: Jun 2008 Location: MN Posts: 1 OS: XP	Re: 94 civic sedan Spark Plugs - Worn, faulty, fouled or incorrect spark plugs can cause a misfire or rough idle. Timing Belt - A misaligned timing belt can cause a misfire or rough idle. Engine Mechanical - Mechanical engine problems can cause a misfire or rough idle. Exhaust Gas Recirculation (EGR) Valve, If Equipped - An EGR valve that is stuck open can cause a misfire or rough idle. Overlooked Causes Grounds - Poor engine control module (ECM) grounds or sensor grounds can cause the ECM to miscalculate fuel delivery and cause a rich condition resulting in a misfire or rough idle.