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probly hav a vacuum leak--if run bad at idle--fuel pump cud be failn too--test those 2 plug wires-may b bad inside--inspect distributer cap for inside corrode--w car that age unplug computer then connect again to see if issue clears----the number can mean a worn oxygen sensor-but to confirm u need a diagnostic scan w specific equip--dont go to a dealer or use a code reader
May have not reconditioned the heads correctly may have a valve issues because the valve spring is bad or could be an injector or gaskets could be leaking on intake manifold could be a lot of different things that could have happened when they serviced the heads. Best thing to do is compression check find out the range for your compression to be at on the gague. That will tell you what’s possibly happening inside the engine. But you have to look in a chilton or haynes repair manual it will tell you what’s up when you read the compression testing gague.
could be few different problems first u need to check for fuel pressure and spark hook a fuel pressure gauge up and see if ur getting any fuel pressure if you have no fuel pressure u either have bad pump or out of gas (don't laugh i had cars come in shop for a no start that where just out gas) if u have fuel pressure then check for spark take one spark plug wire of a spark plug and hold wire about 1/4 inch away from either the spark plug or engine block if u see a spark or hear one if you have no spark your looking at a few different possibles Bad coil, ignition module, crank sensor, etc if you have fuel pressure and spark but still no start u need to check for injector pluse (basically computer telling fuel injectors to open) but now i think I'm getting over your head let me know if this helps and i try to walk u threw other things if this dont help
That 3.3 liter buick engine uses the magnavox coilpack and they are prone to failure. They will give you a weak spark and the engine will be hard starting when it gets to be 30degrees out or colder. The spark output will dissapear when put under a larger load (steping on gas 1/2 throttle or more) causing the engine to misfire at that time. those engine always ran rough at an idle so dont take that as a definate skip. you will never get that engine to run so smoothe that it doesnt wiggle a little when just standing there looking at it. due to the lack of spark and power when it looses spark when moving and giving it 1/2 throttle or so, the transmission will jump into passing gear or 3rd to 2nd(downshift) suddenly because you are giving it the command to by giving it 1/2 throttle. fix the skip and the transmission will prabably act normally. you can usually tell if the coilpack is bad by removing 2 oposing spark plug wires and using a multimeter on the ohms scale, ohm the coil posts out and you should have aproximately 15,000ohms. if you have more than 18,000 or less than 12,000ohms you definately need to replace the coil. the car could have many diffrent problems causing what you have described but my money is on the coilpack. I worked at the G.M. dealer for 15 years and have replace MANY of them.
Good luck , Scott
P.S. - Yes , regap your plugs to .060" but that will not cause he skip
I would remove one plug at a time, plug it back in wire and lay on top of engine block. Have some one crank and look for spark. Do this for each plug. If 1 is missing. You have bad wire. If two sparks are missing, then you have bad coil pack, if 3 is missing, you have two bad packs or bad module, if all cylinders are missing, then module or cranks sensor is faulty. Dont forge to change those plug wires just as often as plugs. They may look good still, but they get weak
You have a miss fire. pull the spark plug wires off the plugs one at a time until one dosnt make a differance. This plug is not firing right and not burning the gas. If you get spark on the plug wire(it might shock you a little if your not carefull just hold it with one hand and dont touch the car with your other) then all you need to do is repalce the plug it self. if the wire is not sparking (if you dont hear sap sap when u pull it off) then you will need wires and maybe cap/rotor.
Just a few things to check. Take off the fuel filter and make sure there is no water in it. If you have put in different spark plugs than AC Delco, then change them to AC Delco. If you haven't looked at the plugs or the fuel filter, then it is way past time to replace the filter and new AC Delco spark plugs only. These places that insist that you use Bosch plugs or split fire plugs don't know ****. The Delco plugs are made especially for your engine and will out last those cheap non-working Bosch plugs.
If the fuel filter and plugs don't fix it, make sure your air filter intake isn't stopped up with a bird's nest. Happens a lot. If it still misses after new plugs, you may have a fuel injector sticking.
The bad smoke is the gas-thinned oil passing the rings and unburnt fuel smoke. The missing really bad is most likely fuel soaked spark plugs. Make sure you change the oil while changing the plugs or you will have a redo. Let us know if any of this helps. Dale
Start with testing the injectors for pulse. Get a NOID light they sell the at almost any auto parts store remove in get plug from injector and plug the noid light into plug look for constant steady (pulse)lighting of noid light. Check all six injector on your strait 6. If all is good remove parke plug wire on at a time from cap and look for increased shaking and less when it replaced(Make sure to use wire puller with rubber insulation to avoid being zapped by spark from coil) Note cylinder with no difference or change when wire is removed. Those would be the problem cylinders. Then get a compression guage and check all cylinders for compression by removing spark plugs and attaching guage to each cylinders, make a not of each cylinder's reading. NOTE THEY SHOULD NOT BE MORE THAN 10 PSI difference in cylinders. Make note of low compression cylinders if any. If compression is good all around spark plugs are good, good ignition wires and you have good pulse pattern from you noid light. The only other problem is BAD INJECTORS and those would be the ones that didn't change when you took off the wires. I have work on these old cressidaalot my self. Good Luck contact me if you need more help and if I solve your problem leave me a FIX-YA comment.