Honda Civic / Del Sol (1992 - 2000) EG/EH/EJ/EK/EM1 Discussion

Multiple Random Cylinder misfire

Thread Tools
 
Search this Thread
 
Old Mar 5, 2025 | 12:58 PM
  #1  
JDMFLORIDA's Avatar
Thread Starter
Honda-Tech Member
 
Joined: Jan 2021
Posts: 22
Likes: 3
Default Multiple Random Cylinder misfire

I’m at a loss on this one I need some help,I have a stock 1999 Honda civic Ex D16y8, I recently replaced my valve cover gasket and my Vtec solenoid gasket, I also decided to replace my spark plugs while i was in there. I did not check my spark plug gap because they are pre gapped (I know I should have checked it anyways) and I torqued them to spec, flash forward 2 days the Honda bond is dry so I start my car up and it’s running perfectly normal, now here is where I messed up, my distributor was making a loud chirping sound it sounded just like a bird so I messed with the distributor bolts and the cap bolts and the chirping went away but my car was running perfectly normal, so i drive my car for about an hour and I notice that my car is misfiring every once in a while at idle not often at all and only noticeable at idle, while I was out I helped an old lady jump start her car and I started to head home about 45 minutes away, after 30 minutes of driving my misfires got a lot worse I mainly noticed it after getting off the highway I got a p1399 and a p0300 and a cyl 1 and 4 misfire code as well, so the next day I did some research and figured out that I might have messed up my ignition timing by messing with the distributor bolts but here’s my thing, and I’m pretty new to doing all my own maintenance and stuff so please don’t judge me too hard but I feel like my ignition timing would have been messed up as soon as I messed with the distributor, so I checked my ignition timing and it was off a bit so I tried adjusting it but no matter how I moved the distributor it won’t run right even though the ignition timing is lined up I’m not sure how all it works so if someone could help point me in the right direction or recommend stuff for me to look at that would be great, my car has new ngk iridium spark plugs new dizzy rotor and cap thank you in advance
(car has 134,000 miles)

Last edited by JDMFLORIDA; Mar 5, 2025 at 06:40 PM.
Reply
Old Mar 6, 2025 | 09:34 AM
  #2  
Heysoos's Avatar
Honda-Tech Member
Liked
Loved
Community Favorite
 
Joined: Apr 2024
Posts: 196
Likes: 82
From: Texas
Default Re: Multiple Random Cylinder misfire

Originally Posted by JDMFLORIDA;[url=tel:52942281
52942281[/url]]I’m at a loss on this one I need some help,I have a stock 1999 Honda civic Ex D16y8, I recently replaced my valve cover gasket and my Vtec solenoid gasket, I also decided to replace my spark plugs while i was in there. I did not check my spark plug gap because they are pre gapped (I know I should have checked it anyways) and I torqued them to spec, flash forward 2 days the Honda bond is dry so I start my car up and it’s running perfectly normal, now here is where I messed up, my distributor was making a loud chirping sound it sounded just like a bird so I messed with the distributor bolts and the cap bolts and the chirping went away but my car was running perfectly normal, so i drive my car for about an hour and I notice that my car is misfiring every once in a while at idle not often at all and only noticeable at idle, while I was out I helped an old lady jump start her car and I started to head home about 45 minutes away, after 30 minutes of driving my misfires got a lot worse I mainly noticed it after getting off the highway I got a p1399 and a p0300 and a cyl 1 and 4 misfire code as well, so the next day I did some research and figured out that I might have messed up my ignition timing by messing with the distributor bolts but here’s my thing, and I’m pretty new to doing all my own maintenance and stuff so please don’t judge me too hard but I feel like my ignition timing would have been messed up as soon as I messed with the distributor, so I checked my ignition timing and it was off a bit so I tried adjusting it but no matter how I moved the distributor it won’t run right even though the ignition timing is lined up I’m not sure how all it works so if someone could help point me in the right direction or recommend stuff for me to look at that would be great, my car has new ngk iridium spark plugs new dizzy rotor and cap thank you in advance
(car has 134,000 miles)
First, I’m not sure what you used Hondabond for..? Are you just referring to the 4 spots around the camshaft?

Definitely sounds like the timing is off if you moved the distributor, and it’s an easy fix if you have a timing light.

you do need to short the testing port next to the ECU to make the timing stick, as the ECU will adjust timing whenever you move the dizzy around.
There’s a great walk through on this site, probably a sticky.

Definitely check your plugs, both for proper gap, and to determine if they’re lean, or rich. You could also have put a plug wire in the wrong location, though I’d expect that to make it run like absolute dog crap. On that note, how old are the wires, and are they quality? (NGK)

What plugs did you install? I hope you didn’t buy them on that jungle website, as they’re often counterfeit, and cause exactly the type of problem you describe.

ETA: damn, 134k..!???? That’s a LOW mile ride bro..!
Reply
Old Mar 7, 2025 | 02:01 AM
  #3  
youstolemybeer's Avatar
Honda-Tech Member
5 Year Member
 
Joined: Sep 2016
Posts: 428
Likes: 74
From: St Louis
Default Re: Multiple Random Cylinder misfire

take a look at the spark plug wells, Im wondering if when you changed the valve cover gasket, that they are leaking oil onto the plugs, filling the well causing your missfire
Reply
Old Mar 14, 2025 | 10:58 AM
  #4  
JDMFLORIDA's Avatar
Thread Starter
Honda-Tech Member
 
Joined: Jan 2021
Posts: 22
Likes: 3
Default Re: Multiple Random Cylinder misfire

Originally Posted by Heysoos
First, I’m not sure what you used Hondabond for..? Are you just referring to the 4 spots around the camshaft?

Definitely sounds like the timing is off if you moved the distributor, and it’s an easy fix if you have a timing light.

you do need to short the testing port next to the ECU to make the timing stick, as the ECU will adjust timing whenever you move the dizzy around.
There’s a great walk through on this site, probably a sticky.

Definitely check your plugs, both for proper gap, and to determine if they’re lean, or rich. You could also have put a plug wire in the wrong location, though I’d expect that to make it run like absolute dog crap. On that note, how old are the wires, and are they quality? (NGK)

What plugs did you install? I hope you didn’t buy them on that jungle website, as they’re often counterfeit, and cause exactly the type of problem you describe.

ETA: damn, 134k..!???? That’s a LOW mile ride bro..!
okay so since the last time we talked I got a new distributor because my old one was hella old, ngk wires too, problem still persists and the ignition timing is spot in I followed that guide, yes I used the Honda bond just in those 4 corners that’s it. I’m gonna pull the plugs and test them like you said because I did get them from a third party site rather than from ngk themselves, but the reason I don’t think it’s the plugs is because after I installed them I started the car up and it ran fine up until about an hour and 15 minutes of driving then the problem started while I was driving on the highway , I double checked plug wires they are most definitely right, so I guess the next step is going to be checking the plugs and if that doesn’t work I’m gonna look at the wires around my ignition, but if it’s not that it’s gotta be fuel related or compression I’d think, I’m not a mechanic by any means but I got a decent amount of car knowledge over the past few years but I’d think if I was having a compression issue my car would be hard to start/ would be only misfiring in the cyl that is bad, and for fuel I would think it’s a pump or filter since it’s a random misfire in all cyl I guess it probably wouldn’t hurt to swap them I’ve had the car 4 years and they haven’t been done yet, I bought it at 89k miles and have had it 4 years so I’ve put on about 45k miles, but other than that I’m not really sure, I’ll pull the plugs out check the gap test them with a spark plug tester if they are bad I’ll correct it and let you guys know what happens that way we can go from there thank you for your time and help you guys

Last edited by JDMFLORIDA; Mar 14, 2025 at 11:17 AM.
Reply
Old Mar 14, 2025 | 10:59 AM
  #5  
JDMFLORIDA's Avatar
Thread Starter
Honda-Tech Member
 
Joined: Jan 2021
Posts: 22
Likes: 3
Default Re: Multiple Random Cylinder misfire

Originally Posted by youstolemybeer
take a look at the spark plug wells, Im wondering if when you changed the valve cover gasket, that they are leaking oil onto the plugs, filling the well causing your missfire
I went ahead and checked and my plug wells are dry
Reply
Old Mar 15, 2025 | 03:49 AM
  #6  
youstolemybeer's Avatar
Honda-Tech Member
5 Year Member
 
Joined: Sep 2016
Posts: 428
Likes: 74
From: St Louis
Default Re: Multiple Random Cylinder misfire

Originally Posted by JDMFLORIDA
I went ahead and checked and my plug wells are dry
pull the plugs and gap them correctly
take off the distributor cap and check the electrodes for any chunk of electrode missing and check the rotor for missing parts, also check the little black dot in the cap, make sure it springs back and forth
you say you replaced the spark plug wires and now have a miss at 1 and 4, make sure the wires are in the distributor correctly 1 and 4 are directly across from each other. I know you said you double checked the wires,
DO IT ANYWAY
po1399 is just honda speak for multiple random missfire, sometimes the IAC gets clogged up to the point that is will stick open causing a lean missfire, clean it with carb cleaner and a fine brush
Do all that and let us know

Reply
Old Mar 15, 2025 | 10:04 AM
  #7  
JDMFLORIDA's Avatar
Thread Starter
Honda-Tech Member
 
Joined: Jan 2021
Posts: 22
Likes: 3
Default Re: Multiple Random Cylinder misfire (solved)

Originally Posted by youstolemybeer
pull the plugs and gap them correctly
take off the distributor cap and check the electrodes for any chunk of electrode missing and check the rotor for missing parts, also check the little black dot in the cap, make sure it springs back and forth
you say you replaced the spark plug wires and now have a miss at 1 and 4, make sure the wires are in the distributor correctly 1 and 4 are directly across from each other. I know you said you double checked the wires,
DO IT ANYWAY
po1399 is just honda speak for multiple random missfire, sometimes the IAC gets clogged up to the point that is will stick open causing a lean missfire, clean it with carb cleaner and a fine brush
Do all that and let us know
thanks a lot man I got it figured out it ended up being two things, 1st the company I bought my plugs from sent me B series spark plugs I found that out when I looked at the shipping invoice vs the part number it was two different things, also the spark plug wires cyl 1 and 4 the contact point that connects to the spark plug was a little too far in the plug boot part so I used some needle nose pliers and pulled them down and that worked amazing now the car is running super smooth thanks again for the help you guys I appreciate it
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
popthatclutch13
Honda CRX / EF Civic (1988 - 1991)
19
Aug 18, 2018 04:51 AM
Staged206K
Honda Accord (1990 - 2002)
5
Mar 8, 2014 05:47 AM
avatar1
Engine Management and Tuning
10
Jan 24, 2011 03:11 PM
whatcivic
Tech / Misc
13
Nov 8, 2007 03:16 AM
SSWEET
Honda CRX / EF Civic (1988 - 1991)
2
Jan 13, 2007 08:32 PM




All times are GMT -8. The time now is 02:24 PM.