B16 obd0 PW0 in 91 crx
for the past few months, when i start the car(cold) it runs really rough for 5-10 seconds, almost like one cylinder is misfiring; then it goes away and runs like a champ. 4 days ago i went to start it and it runs rough all the time now. it backfires and pops a lot especially when cold and less when warm.
i have checked: spark plugs, dist cap/rotor, wires, iacv, and timing seems to be great (timing light).
i am 90% sure it is ignition maybe it is the coil, igniter, or cyl position sensor?
also would O2 sensors do this?
anyone!!!!?????
do these symptoms sound like anyone else's problems ? please point me in the right direction???


Modified by gringo7718 at 4:25 PM 7/19/2004

 

firing order

check and see if which cylinder is miss firing

cyk will indicate code

 

firing order is correct.
it only misfires sometimes. it backfires when its cold. it sucks

 

running a cat or no? My 89 b16 does that at idle, and when its hot, it just does it sometimes. Runs strong though, so no biggie to me. No cat, and a free flow muff means less back pressure, so when you first start the car it dumps alot of fuel until it is warmed up, once its warmed up the misfire sound usually goes down.

 

i have tested and all cylinders get spark from dizzy

any other ideas ???


Modified by gringo7718 at 4:13 AM 7/24/2004

 

yes ur o2 sensor will affect tis because if its not working then its open loop. meaning your ecu is using other signal to determine ur air/fuel ratio instead of o2 and tat makes ur engine runz very rought. double check ur o2 sensor...tat might just be the problem..

 

any codes?

 

no codes.


Modified by gringo7718 at 3:01 AM 7/24/2004

 

to the top

 

i swapped the coil and it is still backfiring until it warms up, then it misfires occasionally. ???? help

if you look closely you can see that the insulation boot is torn on white/blue wire on ignitor, but i have taped that up.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by gringo7718 &raquo;</TD></TR><TR><TD CLASS="quote">B16 obd0 PW0 in 91 crx
for the past few months, when i start the car(cold) it runs really rough for 5-10 seconds, almost like one cylinder is misfiring; then it goes away and runs like a champ. 4 days ago i went to start it and it runs rough all the time now. it backfires and pops a lot especially when cold and less when warm.
i have checked: spark plugs, dist cap/rotor, wires, iacv, and timing seems to be great (timing light).
i am 90% sure it is ignition maybe it is the coil, igniter, or cyl position sensor?
also would O2 sensors do this?
anyone!!!!?????
do these symptoms sound like anyone else's problems ? please point me in the right direction???


</TD></TR></TABLE>

Good Golly miss Molly !
I have the exact same problem to the tee !

thanks for bringing up this topic !

I have a strong feeling it is an o2 Sensor, cuz my car failed emissions.

 

Try switching the dizzy module.
I had the same problems. Even re-wired my entire dizzy. Still had spark and timing problems.
I swapped dizzy's....and problems solved.
I'm pretty sure it was the module.

 

i had the same problem... fixed it with a new o2

 

i am definitely thinking ignitor, but i have no way to test it. anyone

 

running rich? is your ECU chipped?

matt

 

stock ecu. i dont seem to be rich, it is like the spark is late randomly

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SETI20 &raquo;</TD></TR><TR><TD CLASS="quote">Try switching the dizzy module.
I had the same problems. Even re-wired my entire dizzy. Still had spark and timing problems.
I swapped dizzy's....and problems solved.
I'm pretty sure it was the module.</TD></TR></TABLE>

Did you try this at all?
Fix This First!!

 

I'm having the same problem on my Civic (B16).

I took the car to a friend (knows his stuff) and he couldn't find anything. Ignition is all new (MSD). O2 seemed fine.

I have ordered an Apex VAFC to see if this will help. If not, I don't have any idea.

 

should i get a cheap 40$ no name or is the OEM crx si ignitor worth the 90$ ?

 

is it missing firing or back firing?

 

i tried disconnecting O2 sensors and it still did the same thing. so now i am waiting on a new dizzy

 

well it turns out i overlooked this in cylinder #4.

 

ouch

is that 'just' broken? or was it hit by a piston?

 

it was not hit by the piston at all, just a bad angle for the pic.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by gringo7718 &raquo;</TD></TR><TR><TD CLASS="quote">well it turns out i overlooked this in cylinder #4.
</TD></TR></TABLE>

whats wrong with it? looks fine to me.. maybe the porclin cracked? dont think that would really make you back fire.