Hello all,

CEL codes 071, 072, 074 (no 073).

First symptom, car bogged a bit while accelerating at around 50 mph - no CEL. Gradually bogging & rough idle got worse & then light came on.

I did not check right away, and when I did today, pulled the codes above.

Car currently has 168k miles & is all stock & mostly OEM parts.

At 152k miles (28 months ago), I replaced ignition coil, cap & rotor & plugs.

I'm due to replace plugs & will do today. Wires are probably overdue too, but I would prefer to diagnose rather than just start replacing parts.


I came across the diagnostic advice below, but wanted to check with the Honda-tech community for:

advice on most likely sources of the problem.

advice for the most efficient diagnostic strategy..

Thank you in advance for your thoughts & help.
Best,
David



"How to Test Misfire Codes
(1.6L Honda Civic)"

[URL="http://troubleshootmyvehicle.com/honda/1.6L/how-to-test-a-misfire-condition-1"]



P0301 71 Misfire Cyl. 1 Or Random Misfire
P0302 72 Misfire Cyl. 2 Or Random Misfire
P0303 73 Misfire Cyl. 3 Or Random Misfire
P0304 74 Misfire Cyl. 4 Or Random Misfire

 

check mechanical timing

 

Thanks, good tip - I'll try to get a light & do that tomorrow.

 

Take cap off and look for cracks or burns in the cap rotor or coil. You can't tell much by looking at wires though.

 

wires can be tested with your multimeter. probably in faqs here, definitely on the googleweb.

 

mechanical timing requires no light, except maybe a flashlight. look at that, i didnt even have to leave the forum. https://honda-tech.com/honda-civic-d...ssion-2497191/

 

Start by inspecting and gapping the spark plugs and installing new Honda plug wires. Then go from there.