Calling all smog techs..come in smog techs

[doonjumper]

85 chevy C10, 305 engine, HC's are way off the chart ( like around 4.5%) should be like .5 or so right?. Put a new carb on it and nothing changed. New wires, plugs, cap rotor. I unplugged the CPU and nothing changed. Smokes alot of bluish blackish smoke. Comp test showed strongest cyl. is 150 lbs. and the weakest is 145 lbs. Truck sat for 12 years. Suggestions? I paid $500 for it two years ago.

 

[bowtieboy4life2000]

HC is raw fuel that is not burned so it sounds like it is running rich

 

[doonjumper]

Hmmm CPU controled and new carb maybe cpu is bad. I disconected cpu and drove it around town and no change.

 

[bowtieboy4life2000]

does it have a carb or TBI???

 

[doonjumper]

carb with tps i beleive

 

[doonjumper]

Just snapped this pic of the carb. All parts are new

 

[bowtieboy4life2000]

hmm didn't know that had that. can you adjust the air and fuel mixture on the carb

 

[doonjumper]

Dunno...I bought from rebuilder in AZ and they claim that the put all carbs on a test motor to tune it then ship it so I havent even messed with settings

 

[bowtieboy4life2000]

you may want to look into seeing if you can adjust the settings.

 

[bp71k5]

Hmmm CPU controled and new carb maybe cpu is bad. I disconected cpu and drove it around town and no change.

If you disconnected it and didn't find a change, a bad computer might be a good place to start.

 

[4X4HIGH]

It is impossible to install a carb on one engine and "tune" it then install it on a complete different engine and expect it to work correctly.

 

[Speedo]

Change the oil?

Gus

 

[doonjumper]

Yeah changed the oil too complete tune up. Ill tinker with CPU. Anyone know if there is a way to bench test a CPU unit?