Blows check engine light - 1996 Nissan Altima

Black smoke - running rich
flashing check engine light - severe engine misfire .
A flashing " check engine " light means that an engine cylinder misfire has been. detected . You can drive it in for repair , just avoid any rapid acceleration or. deceleration because you can damage the catalytic converter. A flashing " check engine " light means that an engine cylinder misfire has been. detected

Need more information to assist.

Check your coolant level.

first check the code.

Worn out battery--check that out

Did you not check for codes yet?

Going to have to start by checking for fault codes.

You should start with the glow plug relay/timer.Check it to see if may be shorted.Remove the smaller wires going to it and turn the key back on,if the fuse does'nt blow then replace it,if it does then you need to unplug the fuel preheater in the filter housing and try the key on thing again,pretty sure it's one or the other.

Re-check the relay to make sure it's still good, then check the fan by hot wiring it to the battery. Also check the temp sensor on the engine. If the check light is on, don't drive it 'till you find out why or you can damage the engine.

1. Check engine lights come on for numerous reasons ranging from a bad CO2 sensor to the Catalytic Convertor being bad...a garage has the computer and the codes to tell you what is wrong, rough running, again, cold be numerous problems, fuel filter bad, worn plugs, broken plug wire/s. Sometimes, the reason the light comes on doesn't hurt the engine at all, and sometimes it means you NEED to get it looked at right now!

2. Horn could, and probably did have a short circuit somewhere, but really how often do you use a horn?

3. One more time, numerous reasons why the ABS indicator is on.

Without the vehicle being right in front of a person, especailly when three troubles are listed it's very-very hard, if not impossible, to make a good call.

I hope this helps you out some how.

Terry

this problem is A/c system leaking.add enough freon R134A will solve the problem .but you must check where is leaking important.

it could be the thermostat or the heater core id try the thermostat 1st and go from there