welchk85

i have a 90 camaro rs with the 3.1 v6 i was having problems i replaced alot of parts such as

knock sensor
oil pressure sending unit
all vac lines
cap
rotor
pcv valve
pickup coil
alternator
battery
and reset the timing

it drove fine for two days now it is throwing code 35 and 44 and there is black smoke coming out of the pipes it seems to be running good good idle decent amount of power but after it gets warmed up it throws the codes and starts smoking pretty bad any help on this would be great because i need this car on the road asap as its my DD thanks

BahN

Have you checked your O2 sensors yet? 44 is O2 lean. The engine will run fine when it's cold because it's in open loop and not using the O2 sensors for tuning because they take time to warm up to operating temp. Once the engine and o2 sensor(s) have warmed up it will go into closed loop. Closed loop uses the O2 sensors in combination with other sensors to supply the ECM with information about how the cars running. The black smoke you are getting is an overly rich condition. Check the O2 sensor(s) or just replace them. Should be only 19$ each. If the ECM sees a bad O2 sensor saying the engines running lean, it's going to respond by adding more fuel to keep the engine from detonating. This causes the engine to run very rich and produce the black smoke you are seeing.

Code 35 is most likely a result of this as well. 35 is: Idle speed can not be set to desired RPM. The ECM has a desired RPM programmed into it. It trys to keep the engine at this certain speed while idling. If the mixture is off (to rich) there's a possibility the ECM wont be able to keep the idle at that desired rpm.

End conclusion: New O2 sensor(s)

Also, I would double check your timing once more to make sure everything's perfect!

Primetime91

iTrader: (15)

Are you guys serious??

He needs his car back on the road ASAP, it's his daily driver...

welchk85

thanks man awseme reply i will be changing the o2 tomorrow and i will let you know. also i dont want to change for a v8 i live in a city were there is ALOT of traffic the v6 works great has great mpg, and its still a decent car if i really wanted a v8 i have a rebuilt 454 in storage but thats going to be going into a rat rod project that im going to be picking up within the next couple years. for now this 3rd gen camaro is my daily driver as it needs to be running daily. thanks for the replies and i will be changing the o2 tomorrow and i will let you know how it goes.

BahN

sounds good Let us know how that goes!

welchk85

see i would put a 350 in it if i had the time the money and wanted not so good mpg. as far as im concerned the 3.1 is a great motor yeah they dont make it a street rod by any means but they definatly have some getup and go with the proper parts.

five7kid

iTrader: (14)

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