Buick engine problem, HELP!!!

[FD5]

1991 buick century 3. 3 liter v6 auto matic trans. 56,ooo miles original owner engine misses at idle and through running speed and has a bad exhaust odor , smell like rotten eggs. I have replaced the plugs the wires and the oxygen sensor along with the catalytic converter. I am unable to locate an egr valve. Does it haveone, if so where is it located? Also, I unplugged each injector and found one with no noticable engine change.

 

[B.G. Smith]

You need to check the compression on the cylinder that shows no change when you unplug the injector, sounds like a bad valve and raw fuel going to the converter causing the odor. To correctly do a compression check you need to remove all the plugs and test all cylinders one at a time with the throttle valve partially open and energizing the starter with a remote switch so the injectors won't put more fuel in the cylinders. The pressure for all cylinders should be within 15% of each other. If you don't have acces to a compression gauge, remove iginition wire from the distrubitor so engine can't start and turn engine over a couple of revolutions. You can usually tell by the sound of the starter if you have a weak cylinder. bg

[This message has been edited by B. G. Smith (edited 02-04-2001). ]

 

[The patriot]

I'd look at the coil pack.
Eric