I really need help, please read

[a_sesshoumaru]

hi, it`s been two weeks since the problem started, seems the engine is missfiring, it started occasionally when i boosted, then when the engine was cold and after 10 miles of use it disapeared but now it is since the moment i start it and it wont go away, i changed spark plugs, checked for spark, i am not getting codes, changed fuel filter, checked the grounds, checked timing and it is 10 degrees with diagnostic box jumpered, i am running a map ecu, the tuning was perfect and i know there is no way it will loose the data, when i changed the spark plugs i noticed just number 3 and 4 are richer, they look very black compared to the rest. What can be the cause?

 

[supramk3man]

Sounds alot like a ground problem might want to go over them again. You said it was a mapped ecu is there any chance the car losts it battery power. I have heard that those ecu can lose their tunes, i havn't had it happen but i have seen on here that people say it can happen.

 

[a_sesshoumaru]

Sounds alot like a ground problem might want to go over them again. You said it was a mapped ecu is there any chance the car losts it battery power. I have heard that those ecu can lose their tunes, i havn't had it happen but i have seen on here that people say it can happen.

but why is number 3 and 4 cylinder working richer? i doubt that is a injector problem, they are both apparently working the same.

 

[jdub]

What kind of plugs/gap and did you check the plug wires (how old are they)?

 

[a_sesshoumaru]

What kind of plugs/gap and did you check the plug wires (how old are they)?

i found the problem, the number 3 and 4 plug wire are faulty, i thought it might be the coil pack but changed for another and still cylinder number 3 and 4 didn`t work, i am buying new ones tomorrow, Thanks a lot.

 

[jdub]

Yep...Had a feeling the wires might be the problem