i was going to get my smog done today and out of nowhere my check engine light came. went to the smog guy hey scanned it for me as a cylinder 3 missfire. i just put in the delteq 4 months ago along with new plugs and wires. i'm going to check my #3 plug wire anything else i can look for? thanks

 

one more thing. i tried just resetting the ecu. check engine light goes away for about 30 min but car is almost undriveable, once warm up check engine light goes on it runs fine. no hint of a miss at all

 

What year is your car? Its almost impossible to get accurate answers without providing at least the basic info about the car. Add a "signature" with year, model, tranny, major mod's, etc.

Was the SES light flashing? That indicates its a misfire code. A steady light indicates some other code. That's why the year of your car is important, since there is only misfire detction in the 96/97 OBD-II LT1's.

 

sorry i do have a sig but it didn't show up. it's a 97. i checked the plug it was alittle loose. tightend that cheked the plug wire w/ a multimeter and then came up fine. check engine light went away for alittle car got normal temp and missed and light came on again. all plugs wires and deltec are less then 6 months old.

 

changed #3 plug wire ran good 20min later when driving same code p0303? but i do not feel a miss at all it runs real strong. is there more then one way to rest the ecu?

 

misfires happen because of one or more of 3 things
ignition, fuel delivery or compression

your ignition system does not seem to be the culprit but you cant rule it out just yet
i like to do a compression test just to be sure
maybe run some fuel injector cleaner to try and clear up a sticking injector

 

tried pulling plug on injector car ran like crap. could a o2 sensor be the problem?

 

bump for some help

 

i am going to try and run fuel injector cleaner. any other way to test injector other then changing it