missfire help
#1
missfire help
i returned my car back to stock. all my stock parts went in, still need to remove my 255lph fuel pump.
on cylinder 2 and 4, the injectors that i took out, the small shield on the bottom had broke off in my hand.
this is how its supposed to look.
![](http://i252.photobucket.com/albums/hh9/trviper03/rdx%20injector%20mod/1stockinjector.jpg)
and this is how two of them look (injector on the left)
![](http://i252.photobucket.com/albums/hh9/trviper03/rdx%20injector%20mod/2stockinjectorandrdxinjector.jpg)
they are not leaking fuel (amazingly?)
at first i was getting a po1399- manufacture control ignition system or miss fire
the miss fire was only below 5-5.5k rpm.
so then i changed the spark plugs, and o2 sensor, all was good until just recently these codes came up.
po300-random/multiple cylinder miss fires.
po301-cylinder 1 miss fire
po302-cylinder 2 miss fire
po304-cylinder 4 miss fire
po1399-manufacture control ignition system or miss fire
i didnt touch anything dealing with ignition (except for removing the coils)
now im either thinking its the injectors or the coils? im gonna swap the coils out tomorrow from my cl-s and see if that help or not.
on cylinder 2 and 4, the injectors that i took out, the small shield on the bottom had broke off in my hand.
this is how its supposed to look.
![](http://i252.photobucket.com/albums/hh9/trviper03/rdx%20injector%20mod/1stockinjector.jpg)
and this is how two of them look (injector on the left)
![](http://i252.photobucket.com/albums/hh9/trviper03/rdx%20injector%20mod/2stockinjectorandrdxinjector.jpg)
they are not leaking fuel (amazingly?)
at first i was getting a po1399- manufacture control ignition system or miss fire
the miss fire was only below 5-5.5k rpm.
so then i changed the spark plugs, and o2 sensor, all was good until just recently these codes came up.
po300-random/multiple cylinder miss fires.
po301-cylinder 1 miss fire
po302-cylinder 2 miss fire
po304-cylinder 4 miss fire
po1399-manufacture control ignition system or miss fire
i didnt touch anything dealing with ignition (except for removing the coils)
now im either thinking its the injectors or the coils? im gonna swap the coils out tomorrow from my cl-s and see if that help or not.
#2
Senior Moderator
My guess is the injectors.
#6
Senior Moderator
#7
i only had the cylinder 1,2,4 misfire code come up once. all the other times it would say missfire and never gave me which cylinder. so later on today im gonna swap out all the coils for good ones and see if that helps. if it doesnt help then ill get the two new injectors
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#8
well i took the car out today to go for a "test beat".
runs great when first started. after about 10min it starts misfiring but only between 1100-3800rpm now. WTF is going on.
about about 10min of stop and go traffic and cruising at around 5500rpm the misfire went away.
it peels out good, just like it always did. great pick up in 1st and 2nd (3rd is blown)
feels strong in all rpms now. and i can chirp 2nd gear.
i didnt change anything. still the same coils, injectors, and spark plugs (the ones i recently replaced).
im guessing it was bad gas bc the gas in the tank was from nov. when i started tearing my engine apart. im gonna take it out tomorrow and see what it does
runs great when first started. after about 10min it starts misfiring but only between 1100-3800rpm now. WTF is going on.
about about 10min of stop and go traffic and cruising at around 5500rpm the misfire went away.
it peels out good, just like it always did. great pick up in 1st and 2nd (3rd is blown)
feels strong in all rpms now. and i can chirp 2nd gear.
i didnt change anything. still the same coils, injectors, and spark plugs (the ones i recently replaced).
im guessing it was bad gas bc the gas in the tank was from nov. when i started tearing my engine apart. im gonna take it out tomorrow and see what it does
#9
Senior Moderator
It may be gas. Im still leaning towards an injector ???
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