Mechanics

MISFIRING AT 40MPH

1992 Honda Accord • 4 cylinder FWD Automatic • 186,500 miles

Hi there,
I have a 92' Accord fully loaded
I changed my sparkplugs
I tested and ensured full function of ignition coil and even set my timing precisely.
Also changed ECT sensor.

The only problem is that the engine misfires at around 40MPH at around 1600RPM. It hesitates noticeably.
and only does this after a bit of driving. And after it starts to misfire, it idles rough at red lights.
There are no DTC codes.
Just replaced O-ring at distributor but no fix.
and also replaced the valve cover gasket.
It starts up and runs nicely.
What could it be?


Avatar
Molsoncanadian
August 10, 2011.



More information: http://www.2carpros.com/articles/engine-hesitates and http://www.2carpros.com/topics/engine-performance/hesitates

Could be caused by one of the following below

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard it and keep testing.

Rasmataz
Aug 10, 2011.
Quite likely a problem with the EGR circuit.

Nte if the EGR solenoid is ticking during this time.

KHLow2008
Aug 10, 2011.