1990 GMC Sierra "black smoke" Questions

...black smoke, lots of power, runs good, but again, lots of black smoke. After you run the truck for awhile, idle is good, but still lots of black smoke. When fuel in tank gets low/ truck will stall ...

...black smoke out of tailpipe and loosing power Suspect cracked injector(s). I drove a truck with cracked injector and it billowed black smoke. Power loss can be anything from a sensor to a clogged ...

Why does truck smokes when stop at a red light. White smoke is coolant leaking into the cylinders, White with a blueish tint is oil burning. Black smoke is too much fuel.

black smoke runs badly, fuel pressure regulator or temp sensor? black smoke look for a vacuum leak. A large vacuum leak will do just what you described. I would listen for a leak first if you cant ...

up and driving at low speeds Maybe to much fuel. Does your coolant gauge work or register? Could be the ECT sensor. Could be fouled plugs also. Do you have smoke coming out the back? is it black smoke

black smoke both indicates a leaking injector(s) fuel pump ok...clean inside the throttle body with spray carb cleaner...make sure the engine is cool and do not start it while real wet with carb clnr.

...black smoke out exhaust first ,l want to know whether is caburettor type or injection,if carb check your carb float, injection you should get a car scanner read for fault code maybe air mass sensor, ...

...black smoke, idleing rough at stop lights and getting poor gas mileage. What would cause this? If the check engine light is on, you would need to check the computer for trouble codes first. If the ...

...black smoke coming from exhaust, we have changed the module, the coil, cap & rotor & wires, spark plugs are new, new gas pump and filter and relay, as well as a new map sensor and idle air ...

Excessive black exhaust on 2003 GMC Sierra Duramax Diesel. We have a 2003 GMC Sierra Duramax Diesel. Recently started having excessive black exhaust. No check engine light or other symptoms. Any ideas