Please help me diagnose my car

[m3f_itsme]

i just finished checking the O2 sensors with the computer, the lambda-sensor voltage 1 and 2 both rests at 4.75 during drive and WOT it moves to 1.1-1.6 for a couple of seconds and goes back to 4.75, the "monitor sensor 1 and 2 after cat" is consistently at 4.71...it wouldn't change until i hit about 100 mph whiles monitoring live data, then it moved to 3.12 and then back to 4.71.... for a very short second. i tried using the multi-meter but couldn't get any readings perhaps wasn't hot enough ? it takes my car about 5 to 6 cranks to start the engine when engine is cold and when it starts the idling is very rough after a short drive check engine lights up with the same four codes


202 fuel trim limit Bank 1

203 fuel trim limit Bank 2

227 fuel trim, Bank 1

228 fuel trim, Bank 2


should the oxygen sensor be affecting my start characteristics ?


You have an E36 M3 correct? How do you have a lambda sensor?


O2 sensors would not cause any starting issues. You mentioned that you replaced the head, how sure are you the set the VANOS timing correctly?


From the symptoms of long crank before start and you recently did some head work. I'll double check the VANOS first.


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[m3f_firespydar]

i used lambda and o2 sensor interchangeably, i am sure the vanos timing was set right, i have done it on three different occasion with no problems, i could probably redo it all over again, the car runs great when the engine is warm, and no start issues when its warm. i will look into the vanos setting again. thanks for your help



You have an E36 M3 correct? How do you have a lambda sensor?



O2 sensors would not cause any starting issues. You mentioned that you replaced the head, how sure are you the set the VANOS timing correctly?



From the symptoms of long crank before start and you recently did some head work. I'll double check the VANOS first.



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