Runs rough then clears up &runs great

Hi. If you see white smoke out the tailpipe, the engine is running rough and the coolant temp is getting higher and fluctuating. Your engine has a bad head gasket. There is no way the radiator cap can hold back that type of pressure. With the radiator cool and full. As the engine runs, you should witness coolant filling the over flow reservoir. Any questions please write back.

This is usually caused by a bad crankshaft postion sensor.

What is the fault code you receive when the engine light comes on?
If you do not know try to retreive the engine trouble codes and post them here.

Could be from that or bad head gasket

Hi,
It sounds like you have alot of problems which may only be a couple.
Have the coolant thermistor checked, it sounds like this is not switching off and causing the engine to over fuel, making it run rough and blow black smoke out the exhaust.
Have the engine thermostat checked it maybe faulty causing the engine to over heat., have these done and see how you cars goes then.

signs of a bad fuel pressure regulator-- the vehicle will run rough, the engine will not start ( usually in the mornings,) many times engine starts but stalls shortly after starting. a bad regulator can result in fouled plugs. replacement is only cure. 1- black soot on plugs-2-black smoke from tailpipe-3- running rough-4- stalling, good-day! repost if need be.

coolant tempurature sensor may be bad. (if it is bad it will run to rich, run rough at idle, and produce black smoke. engine may stall out.

Sounds like either the float level is too high, there is a problem with the float needle valve or the power valve is stuck. I'd take the carb off and either replace it or take it apart and check everything inside. If you do nothing, chances are it will either get worse or if it's a small piece of junk inside, it may clear up by itself...I'd take it apart. Since it's pretty new, if you are careful, likely you won't need a gasket kit.

do you have enough oil?

sounds like possible a sensor went bad or is loosly connected. O2 sensor??? Also check the air filter. Sounds like whatever it is, is making the truck run rich----that would be the black smoke.


Hope this helps