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not starting when it gets warm could be a starter problem, the amp draw is probably to high for the battery to supply enough power to start. starter draw should be around 150-200 amps. the black gray smoke is too much fuel that isn`t being burnt. if the starter draw is too high then there isn`t enough voltage for the ignition system to fire the plugs properly causing the smoke.
if its making the engine smoke its the pipe or the thermostat housing next to the exhaust manifold even a pin hole will make it come out and squirt on the exhaust, run engine to temp squeeze the pipes, you should see were its come out from then you can fix it.
If your loosing coolant when it cools off and draws it out of the resevoir,you know it is water and then maybe white smoke.
You could warm it up without the rad cap and look for bubbles. It will push out air and coolant anyway,so that will be a difficult test.
Dual exhaust issues,should be common to both banks. I would go with coolant and intake gaskets first,may have a crossover in manifold,so you get both pipes effected.
Is it gray, bluish gray, or white? White smoke, during warm weather, indicates that you have a head gasket out and it's vaporizing water, it will look much like it does when you first start it on a cold day. Bluish gray indicates burning oil, which could be bad valve seating, severe engine wear on your piston rings and oil is blowing past them into the combustion chamber. Grey smoke is probably water as well, though it could be contaminated with oil, or the vehicle could be running too rich, getting too much gasoline. But typically this is more of a black smoke than gray.
you have bad valve seals again and it is possible that the valve guides are bad ( to much play ) i worked for Jaguar 13 years and i have done 100's of these and very few needed guides it sound like the seals where not done correctly at the last repair.
White smoke is caused by coolant or water
coming out the tail pipe. There is a
chance that the white smoke was caused by
water splashing up from a puddle onto the
exhaust pipe. Keep an eye on the
coolant level in the radiator in any event. If its less then there leak coolant leak in the car engine which is causing this problem....
From my experience gray or white smoke means a blown head gasket. Check the oil and see if there is any water in it. You can also check radiator and see if there is any oil in it too. Hope this helps
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