Question Asked: How can I identify engine Misfire?
May 12, 2013, 08:33 PM
Intermittent but not Random. No misfire under load or while driving. It idles and run rough while stopped after 15 minutes of driving in temperatures above 50 degrees. Runs smoother in temperatures under 50 degrees and sometimes while raining.
Maintenance - 2011-2013
Vacuum - 22 in. HG Steady = Good
Compression - Good
Fuel Pressure - Key on, not running, 40 psi = Good
Fuel Pressure - Key on, engine running, 32.5 = Good
Spark plugs replaced - 2012
Spark plug wires replaced - 2012
Distributor and cap replaced - 2012
Coolant Temperature sensor replaced - 2011
Throttle position sensor replaced - 2012
Camshaft position sensor replaced - 2013
I listened to each of the 6 fuel injectors. 4 sounded smooth but 2 are a bit noisy. But all are working.
Oil changed - Jan. 2013
Fuel filter changed - March 2013
Coolant Changed - Feb. 2013
Valve cover gaskets replaced - June 2012
Fuel system cleaned - Feb. 2013
Throttle body cleaned - March 2013
EGR valve - applied vacuum, the engine stalled. It passed.
Ignition timing. May have been adjusted when distributor was replaced. Not sure.
The fuel strainer on the fuel pump not checked but fuel presser is good.