Been setting for a year. due to accident putting it back together start it from time 2 time the last couple of times really rough idle and black smoke out of tailpipe really bad carbon smell up buy the motor
Bad carb or fuel injection issues- the system is fuel rich (black smoke) and also fuel rich system can make the idle low. Many things can cause this but thses are just a few.
SOURCE: 87 Supra idles rough and dies out
I would suspect a vacuum leak. At idle under high vacuum the air fuel mix is being leaned out until you have misfiring so bad the engine quits. The exhaust smells rich because even a lean mixture, if it doesn't light off, if full of unburned fuel. At road speeds, the vacuum is low so the engine doesn't care if there is a small leak somewhere. It is getting most of its air through the open throttle. Check all your vacuum lines but remember that even if every line is okay, it could still be leaking from an old cracked intake manifold gasket.
SOURCE: rough idle
check you throttle position sensor first then fuel pressure regulator, then fuel pump. i have a 92 and had to recently do a massive overhaul. my rough idle was caused by a malfunctioning tps with a small exaust leak causing it to race and an intake manifold gasket. also check your idle speed adjustment settings.
SOURCE: 2002 Highlander PO136 Error Code and Rough Idle
The po136 code is a bad 02 sensor, on cylinder bank #1
sensor #2, which is the downstream one. needs new one.
SOURCE: engine rough idle cold. passes smog once temp reaches thermostat
you can take apart the top section and blow out the small passage that's bellow the throttle plate.
SOURCE: 1990 Toyota Pickup
carb or Fuel injected try cleaning either one of these bad distributor cap or rotor or distributor good luck
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