SDPGreen

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

eghatch9295

iTrader: (1)

check mechanical timing

SDPGreen

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

mk378

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.

eghatch9295

iTrader: (1)

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

eghatch9295

iTrader: (1)

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/

Former User

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