hon2984

Whats up fellow honda lovers! I got a 96 civic hatch d16y7 completly stock... I picked this up just after my EG hatch was totaled.... I havent really ripped on it considering the last car was swapped.... I really just grandma it around..... anyway I had the car for a week, driven two times daily and no CEL..... After a week the CEL came on n It ran like poop..... hard to think I could get worse than a stock Y7 lol any way I've been trying to fix it....

Codes:
P0301 cylinder 1 misfire
P0302 cylinder 2 misfire
P1300 random misfire


Thinks I have done:
Checked Valve clearance (no adjustments needed)
Replaced Cap n Rotor
Checked the plug wires reisitance ( all checked good)
Check ignition timing ( no adjustment needed)
replaced the plugs with standard NGK plugs gapped to spec
check fuel pressure 38 psi
replaced fuel filter ( i had to due to the fuel leak, needed the crush washers)
I also swapped 1&2 fuel injectors to 3&4 and vice versa. The misfire stayed on 1&2.
I cleaned the fuel injectors with brake cleaner because they had carbon build up on them. I also did a fuel injection service on it because it had the same carbon build up in the ports... it made an improvement but ddin't fix the misfire....

I was thinking that these must be related since the CEL didnt come on for a week, and that they both appeared at the same time.....

So the problem should be able to affect two cylinders.....

I havent checked compression yet but I'm thinking that it would be unlikely that two cylinders would go bad at the same time.



Any one have an Idea?

This would have a resistor box correct? is that a possibility?

Former User

Test the coil and ICM inside the distributor.

hon2984

I havent gotten around to doing that yet but I have the print out from alldata, and its definately on my list, as well as a compression check.

wouldn't the ICM effect all of the cylinders?


Is the resistor box a possibility?

Former User

Mangotreemechanic

Change the spark plug wires. What happened to me was the wires measured out okay, so I changed rotor and distrib cap, spark plugs. Car ran great to work. Driving home after work, misfire returned. Bought new spark plug wires on the way home. Got home and changed the spark plug wires and ALL got well and misfire TOTALLY went away.

hon2984

I tested the coil...... primary winding restsitance is opposed to be 0.63-0.77 ohms at 68 defrees F it tested 1.2 ohms at 95 degress F

secondary winding sopposed to be 12.8-19.2K ohms it tested at 18K ohms.



I also tested the wiring for the ICM

has power at black/yellow and at white /blue

yellow/green from ICM to ECU connector .7 ohms and no continuity to ground

blue from ICM to tachometer .9 ohms and 160K ohms connection to ground


I thought that seemed weird, there is not sopposed to be contunuity to ground on the blue

wire......

I also used a stethescope on the fuel injectors, they are all clicking...

anybody have an idea?

Former User

Remove the coil and test it in a cool room indoors. My guess is that it will test bad.

Take the ICM to an auto parts store for testing.

hon2984

blue from ICM to tachometer .9 ohms and 160K ohms connection to ground


this isnt sopposed to have continuity to ground..... is that i high enough resistance to ground? I should be expecting OL right?


I did order a new coil and had it sent over and it tested to the same specs....

Former User

hon2984

I moved the brand new BWD part inside for an hour n tested it was at 75 degrees F. still measured 1.2 ohms

I ordered another one, it was a masterpro part it tested to 1.3 ohms....

I got my specs off ALLDATA.... it said

primary winding restsitance is opposed to be 0.63-0.77 ohms at 68 degrees F


does this sound like the correct spec?

this has me thinking maybe I should replace the batteries in my DVOM.

hon2984

did some reading on a honda service manual pdf

those are the right specs....
gonna put new batteries n my DVOM and retest.... I also have another DVOM I can try.

hon2984

did a compression test today..... #4 220 #3 210 # 2 145 #1 220

did a leakdown test on #2 leaking through the exhaust.......



could a compression problem on #2 cause a misfire on #1?

is that possible?

exhaust gas leak through the cylinder into the intake mani and into #1..... exhaust gas causing the misfire on 1?

civiclx1988

im gonna guess and say your head gasket is shot or starting to fail...

hon2984

I did pull the valve cover n turn the rotating assembly over by hand to watch the rockers/ valves/springs. Both side are moving, and seem to stop and start at the same height...

The thing that makes me wonder is why I would get a misfire on one..... everything on one checks out.




When I leakdown tested it the air was coming out the exhaust.....

I was kind of thinking bad valve seat....

hon2984

thinks my batteries on my DVOM were going dead! ended up having mechanical problems.... had leakage through the exhaust when I did a leak down test! compression was good on 3 cylinders and one would get up to 140 psi then bleed right down to zero.