1993 Buick Century runs rough

PHARVEY123

MEMBER
1993 BUICK CENTURY

Engine problem
1993 Buick Century V6 Front Wheel Drive Automatic 245000 miles

recent tune-up wires, plugs, oil ch. Filters, ran ok then but has gotten real bad, runs rough at idle and higher rpms, surging, lits misfiring (like bad dist cap if it had one) replaced weak coil (cyl 3-6) and checked codes but none were stored. Could this be problem with balancer or crank pos sensor. Please help

5 Replies

NDDUNC

MECHANIC
47 POSTS

It may be the harmonic balancer. Sometimes it will crack on the shaft and move just a bit. That throws it out of time, witchwill make it miss. I had a 93 olds that done the same thing. Please answer back, I am interested in helping

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Sunday, December 9th, 2007 AT 9:11 AM

PHARVEY123

MEMBER
5 POSTS

Thanx for the response NDDUNC, I visually inspected the balancer with a mirror with it in the vechicle, nothing was apparent. I will remove it the check closer then get back to you.
Thanx again
Pete

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Sunday, December 9th, 2007 AT 9:00 PM

NDDUNC

MECHANIC
47 POSTS

It dont take a centermeter of movement to mess things up. Also if you remove it, remove the crank sensor&inspect it. Its just made of plastic. Please bare with me. Computer problems. Kids ha ha.

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Monday, December 10th, 2007 AT 12:14 PM

PHARVEY123

MEMBER
5 POSTS

NDDUNC, I replaced the balancer having found a lot of powdered rust on the inside of the pulley section? That caused no change in running condition. I also replaced the crank pos. Sensor which also caused no change? Rechecked all basics like cyl numbering/fireing order, wires in correct place. I am really scratching my head on this one. Please suggest other things to check.
Thanx Pete

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Saturday, December 22nd, 2007 AT 9:09 PM

NDDUNC

MECHANIC
47 POSTS

Well, now you need to check the compression on each cyl. Im not 100% sure what it should read though.I think it is around 125-150 psi. If I find diffrent, I will let you know asap! Youvegot me scratching my head also! Please bare with me, as I have severe computer problems. I have to go to my neighbors or the lib.[ Limited time ]