just spent 500 bones - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 10-29-2003, 08:42 PM   #1
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A wierd and very loud rattleing noise was coming from the engine. During diagnosis my dad and i determined it only happened with the fan belt on. So i replaced the power steering pump, water pump, and idler pully, and tested the alt. All of them were working in good condition. There went alot of money. I jokingly asked my dad if he could turn the crank at the crank pully, he reached down and spun it, EUREKA broken harmonic balancer. That job we couldnt do ourselves, dealership did it for $320.

Heres whats bothering me, the car seems slower, less pickup, and the idle at 200 deg is ~1100rpm

should i wait for the comp to relearn or should i disconnect the batt cuz there might be a bad code in their. or am i looking at a bad IAC?


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Old 10-29-2003, 09:47 PM   #2
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ok i just went to autozone, found out they dont pull codes anymore for free or for a price, aparently its been like this for months. anyways, i just pulled the codes from teh ECM using the paperclip method as described in techinfo, its code 21 TPS - volt too high.
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Old 10-29-2003, 10:13 PM   #3
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TPS is your throttle position sensor. Could be shot. Easiest way to test it is with a scan tool, but you can also check it with a multimeter.
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Old 10-31-2003, 01:05 AM   #4
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harmonic balencer. i replaced that in my 90 toro few months back.. what you had to do was take the starter cover off and hold the crank from movin and then use an impact to remove that big a$$ bolt and when installing the new one be sure that it is to torque. well easy for me to say I have the tools but needless to say that is a very important thing to replace. mine started to make noise all of a sudden. turned car off then on and it was clatterin. it was a 90 doller fix but i had a buddy with a celebrity that had it go a week later. well he kept driven it and the block got a big hole in it and the 3rd piston shaft is sticking out. ouch :(
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