Bummer deal! Rough idle and black smoke indicates a possible bad fuel injector leaking gas - or failing spark plugs. Bad or dirty injectors are a cause of sticky valves, and when sticky do cause rough idle and sometimes valve tapping - beside black smoke. Check those items first as they are most common failures. Rarely, a engine head sealing gasket may leak coolant into the motor to cause such problems. That would make a white steamy smoke. In that case it would overheat - did it? In this case, serious engine work, or a new engine is needed. I like the products at this web sites to end those issues. Hope this helps. DIY fuel injector cleaners fast acting Ends several tune up problems
DIY fuel injector cleaners fast acting Ends several...
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SOURCE: Rough idle, no power, steamy exhaust
The answer was the plug top coils. The plugs and coils were replaced and the car is fine. The steam was not steam - it was white smoke from the catalytic converters.No mayo in the oil and no coolant level drop should have eliminated the head gasket. The steam turned out to be a red herring.
SOURCE: Audi A4 2.5 V6 TDI - Creamy grey coolant in expansion tank
Sounds like blown head gasket (or worse) still to me.
Remove oil filler cap and look for grey oil.
Never use water these days but special coolant. Water makes vapour spots and cause block cracks, worse then blown gaskets!!!
vapour does not cool very well.
Look like you have cracks already.
Take a compression test if possible. But might not show op at that temperature.
The gauge indication troubles me.
SOURCE: what does the orange warning sign on the dashboard means?
There are several waring lights on your dash so lets see if i can guess: does it look like this ( ! ) with some squiggly lines under it? If it is that's your tire pressure warning light tell you that one or more of your tires is low on air. after you correct you tire pressure you'll find a tire pressure reset switch just inside you glove box push it for a few seconds and your warning light should get cleared.
SOURCE: 1995 gmc jimmy 4x4 rough idle smell gas from tail pipe
To check EGR valve, plug the vacuum hose to it, and it should not get hot anymore. It if does, it is leaking.
But gas smell is usually bad plug wire or plug.
With good insulation, remove one sparkplug wire at a time, to see if one has no effect. That is the target.
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