Misfire, high NOx
#1
Good, Bad…I'm the one with the gun
Thread Starter
Join Date: Jul 2002
Location: Trapped in time, Surrounded by evil, Low on gas
Posts: 5,241
Likes: 0
Received 2 Likes
on
1 Post
Misfire, high NOx
1998 civic EX, auto, stock, 180k miles.
part throttle causes occasional misfire, i attributed to a cracked exhaust manifold, which i had replaced. the misfire continues. ca failed SMOG with high NOx.
ideas? clogged injectors? bad cat?
part throttle causes occasional misfire, i attributed to a cracked exhaust manifold, which i had replaced. the misfire continues. ca failed SMOG with high NOx.
ideas? clogged injectors? bad cat?
#2
Good, Bad…I'm the one with the gun
Thread Starter
Join Date: Jul 2002
Location: Trapped in time, Surrounded by evil, Low on gas
Posts: 5,241
Likes: 0
Received 2 Likes
on
1 Post
Re: Misfire, high NOx
going to run some injector cleaners and see if the missfire goes away. my thought on that is lean mixture causes high NOx levels due to clogged injectors.
#3
Re: Misfire, high NOx
How long were you driving with the cracked manifold? You can kill the o2 like that.
Have you checked the timing? What about plugs/wires?
I just looked around for a minute, and found someone in cali with High NOx issues. He replaced cat/o2, ran seafoam, retarded the timing, etc. At the end he swapped the o2 for another one and it passed.
Have you checked the timing? What about plugs/wires?
I just looked around for a minute, and found someone in cali with High NOx issues. He replaced cat/o2, ran seafoam, retarded the timing, etc. At the end he swapped the o2 for another one and it passed.
#4
Re: Misfire, high NOx
Check your plugs, if you were running rich you could of fouled them.
Also, reset your ECU, since you have a new exhaust mani.
Also, check your primary O2 or should of when replaced the exhaust mani.
Also, reset your ECU, since you have a new exhaust mani.
Also, check your primary O2 or should of when replaced the exhaust mani.
#5
Re: Misfire, high NOx
CEL codes?
When was the fuel filter last replaced? Have you measured the fuel pressure and tested the FPR?
Is the problem eliminated by unplugging the O2 sensor?
When was the fuel filter last replaced? Have you measured the fuel pressure and tested the FPR?
Is the problem eliminated by unplugging the O2 sensor?
Last edited by Former User; 03-15-2012 at 08:06 PM.
#6
Good, Bad…I'm the one with the gun
Thread Starter
Join Date: Jul 2002
Location: Trapped in time, Surrounded by evil, Low on gas
Posts: 5,241
Likes: 0
Received 2 Likes
on
1 Post
Re: Misfire, high NOx
the plugs are fine, the car if anything was lean. there was a general misfire code, which went away. have not replaced the filter, nor the O2 sensor, rather not, if not needed.
Trending Topics
Thread
Thread Starter
Forum
Replies
Last Post
krazy_23
Acura RSX DC5 & Honda Civic EP3
2
02-02-2016 10:18 PM
StuckInTexas
Honda Civic / Del Sol (1992 - 2000)
4
11-08-2012 07:55 AM
alotawatts
Honda Civic / Del Sol (1992 - 2000)
2
09-20-2004 03:24 PM