Question about Chevrolet Astro
6 cylinder 4.3 Chevy motors are notorious for this. I actually look for these vehicles to buy, because people think there is something severely wrong with them and they sell them cheap and it's really an easy fix.
What's happening is, as these 4.3 engines get up in mileage, at the back of the cylinder head,right on top of the side with the "sooty" spark plugs there is what is called an oil return.It's simply a hole through the head. Once oil is pumped up to the top of the head,(under the valve covers) due to the angle that the engine sits at leaning toward the rear, the oil runs to the back of the head and runs through this hole "returning" to the oil pan, where it is picked up by the pump to start the cycle again.
Well, on the 4.3 GM engine one of these oil returns becomes clogged with sludge and "gook" not allowing the oil to return to the oil pan. So it sits on top of the cylinder head when you shut off your engine. As the car sits, this build up of oil slowly runs through this clogged oil return,pooling up on the back of the valves where it seeps through your worn valve seats, filling the cylinder (combustion chamber). Where it sits until you start your car, when poof clouds of smoke from all of that oil burning of upon ignition.
Before starting this procedure buy new valve cover gasket and RTV cement.
I don't know how mechanically inclined you are, but to solve this all you have to do is;
Posted on May 22, 2011
These are known for distributor caps and rotors going bad,also if this is a vortec motor they also have a problem with the injectors leaking in the intake manifold causing pooling of fuel and a rich running condition,on the side with the leaking injectors.check for any codes and take a look at the map sensor.these should be checked out.
Posted on May 22, 2011
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Posted on Jan 02, 2017
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Firing order for 1992 chevy astro 4.3L, From front of engine driver's (left) side No.1, to right front, No.2. left side middle cyl. No.3. Right side mid. cyl. No.4. Rear cyl. left side, No.5. Rear rihgt No.6. On the Distributer cap from No.1 (should be marked) plug tower order is 1,6,5,4,3,2.
Read more: http://wiki.answers.com/Q/What_is_the_firing_order_for_a_1995_Chevy_Astro_4.3L#ixzz1OeLSDOuP
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