Reni-Camaro

no check engine!
New oxigen sensor!

84CAMARO28inFL

Id love to offer advice, but i do not know what "black spark" is.

Does the car run?

Reni-Camaro

Sorry my english!

Spark Plug black, I think it is a rich exhaust

yes, but very bad

firebird904

When's the last time the car's had a tune up?

Reni-Camaro

i bay engine 3.1 for swap my car!
6-12 m.

Project 3.4 Camaro

Is the black stuff sooty(like powdery kind of, particles fall off if you touch or rub it) or is it oily/greasy? The former means you are running rich(typical of these engines) the latter indicates bad valve stem seals or piston rings.

84CAMARO28inFL

There was a fair amount of oily slime around my spark plug holes, but my carb is out of adjustment and i know that.. could that make more "running rich?" And they call that "soot," right? Ive done iston soaks on my engine with carb and choke cleaner, sprayed in to the spark plug holes. Smoked for a bit, then when that cleared up, nice and smooth-running.

OP, does it consistently blacken up the plugs?

Reni-Camaro

Yes ''soot''!

how to test the MAP???

I guess it could be a temperature sensor?

ex-x-fire

Test fuel pressure & leak down rate.
Put a tee into the vacuum hose that goes to the map sensor, hook up a vacuum gauge. It should be above 16.5" at idle, with a smooth needle sweep. Have the engine scanned for live data.
You can test the coolant temp sensor, you need an ohm meter, thermometer, & a pan of water (heat it up slowly to 220 degrees), note the ohms at different temps. Google GM Coolant Temp Sensor Values for the ohm/ temp readings.

firebird904

Reni-Camaro, if you need the coolant temp sensor values you can pm me and I'll send you an attachment with the chart.