Question about 1991 Isuzu Pickup

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WHITE SMOKE FROM TAILPIPE - I THINK ITS VALVE GUIDES OR RINGS WHICH IS MOST COMMON?

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  • Dave  C
    Dave C May 27, 2010

    Most likely a blown headgasket, a very common problem on these engines. Check the level of the coolant in the radiator. If you're topping it off and it continues to disappear, it is probably going out the tailpipe.

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  • Isuzu Master
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What part is causing the problem all depends on when u see the smoke if it is at start up or on deceleration then the valve guides are worn out or the valve guide seals are hard and have fallen off from age, if it smokes on acceleration u have ring and or piston problems or a scored cylinder wall. Valve guides are more common, but like i said u don't say the when of the smoke.

Posted on May 27, 2010

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Jeep 4cyl flathead smoking


White or blue smoke? If white does your hand get damp holding up to the tailpipe when the engine is running? Does the radiator boil over/engine over-heat easily? Flat head engines are notorious for running hot especially if not moving. Flat-heads don't cool well as a general rule and the older radiators are not very efficient heat exchangers. If the smoke is white then the headgasket is blown or the head or block is cracked (the first two are more common). If the smoke is blue then the valve guides and/or the piston rings are worn fairly severely. Ironically the easiest way to damage the piston rings or valve guides in a flat-head is to run it hot.

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If white smoke appear when you take off from traffic lights or accelerating after coasting downhill then this indicates that either the engine has worm piston rings or valve guides.
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If the black smoke is discharged from the tailpipe then the engine is running too rich and the engine needs a tune up.
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Blue smokes come out tailpipe when i start the car but stops afte


Helllo there
Symptom: Gray or blue smoke from the exhaust. You notice gray smoke coming from the exhaust when you start your car. The smoke may or may not disappear after the car is warmed. If it is, it is less noticeable. The smoke may have a bluish tint to it. Possible causes:

  1. The engine's piston rings may be worn.
    The Fix: Replace piston rings. (Generally not a DIY job)
  2. The engine's valve seals may be worn.
    The Fix: Replace valve seals. (Generally not a DIY job)
  3. Damaged or worn valve guides.
    The Fix: Replace valve guides. (Not a DIY job)
Symptom: Engine uses more oil than normal, and there is some smoke from the exhaust. The oil level is low between oil changes. It appears that the oil is being burned by the engine because of the smoke in the exhaust. You may or may not notice the engine doesn't have the same power as it used to.
Possible causes:

  1. The PCV system is not working properly.
    The Fix: Replace PCV valve.
  2. The engine may have mechanical problems.
    The Fix: Check compression to determine engine condition.
  3. The engine's piston rings may be worn.
    The Fix: Replace piston rings. (Generally not a DIY job)
  4. The engine's valve seals may be worn.
    The Fix: Replace valve seals. (Generally not a DIY job)

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