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Multi-Probs need ur help and Opions
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Woodsman13
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Oct 7, 2010, 6:27 PM
Post #1 of 7
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Multi-Probs need ur help and Opions
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1993 Buick Century Wgn 3.3
ok at around 50 mph it has a jerky feel and motor sounds rough on take off somtimes. lol and when i say jerky i dont mean slight. sounds ok in park or cruising... usually hits at around 50mph. also hav a "tire hum sound" the tires did wear oddly.
-------------- have done ------------
* new plugs and wires
* correctly gapped and wires rechecked... all plugs are dry and seem to burn ok
*cleaned throttle body
*has recent new front brakes and ball joints
*replaced top "dogbone" motor-mount( was worn and loose)
*all fluids are clean and at correct levels
*not picking up on any vacumn leaks
*replaced fuel filter
*has 2 brand new balanced front tires
* fuel pump was replaced once but about 6 years ago
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oh 1 more if it sits for just a short time it has to crank quiet a few times b4 starting.
any ideas and what not would be great thx. If not Im inviting you all over for a buick bon-fire lol
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DanD
Veteran
/ Moderator
Oct 8, 2010, 3:18 AM
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Re: Multi-Probs need ur help and Opions
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Have the fuel pump tested for proper pressure and whether the pressure holds for a minimum of 10-15 minutes after the engine has been turned off.
The humming noise could possibly be a wheel bearing beginning to fail?
Dan.
Canadian "EH"
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Woodsman13
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Oct 13, 2010, 1:54 PM
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Hey DanD thanx................. I checked fuel pressure all seems good...... got pointed in the direction of Balancer and sensor. was asked to pull belt off and try it agian... did ... and the prob seemed to dissappear... but now im not where to go with balancer and or sensor Id hat to have to replace both.. I changed the Balancer about 3 yrs ago.. and the guy i spoke with said these motors hav a hard time with a certain brand of balancer and will develop a defect... Know how i can check these at all?????
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DanD
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Oct 14, 2010, 3:35 AM
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Re: Multi-Probs need ur help and Opions
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Not sure what you mean; you removed the belt and what seemed to disappear?
The jerking; how did you get to 50mph with no belt and not over heat the engine?
The extended cranking during start up or the tire humming noise?
If for whatever reason you suspect the balancer; replace it with an OE and there wont be any doubt on its quality or proper application.
Again not sure where we’re going with this?
The only balancer failures that I’ve seen with these; is the rubber bonding between the two halves of the balancer, would let go and it would cause a knocking noise. I’ve not seen or remember seeing a running issue due to the sensor vains going out of time; they’re riveted to the centre portion of the balancer? I have seen the vains become bent from something hitting them; but that usually destroys the crank sensor and the engine shuts off.
Dan.
Canadian "EH"
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Woodsman13
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Oct 17, 2010, 5:15 PM
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Sorry guess i wasnt to clear.... getting frustrated with it. When its parked and can put it in gear at an operating temp and giving it gas in drive with brake on the motror will seem to miss and shake...... same movement as if driving...... the wheel hum ill deal with. just not sure whats causing this hard jumping around missing.. the motor is almost too quiet to hear while on the road..... anyhow somthing messed up my sensor it had a notch cut in it.. replaced sensor and balancer today.... went for a road test and that hard jerking still appears when under a load..
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speed
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Oct 17, 2010, 8:37 PM
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just wondering does it idle fine? will it sit and idle perfectly normal forever if it could, or is it kinda jumpy?
GM ASEP 26 SCC Milford ASE certified in Brakes and Electrical on Thursday April 5th 2012
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DanD
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Oct 18, 2010, 3:51 AM
Post #7 of 7
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You may need to bite the bullet on this one and take the vehicle in and have it diagnosed by a tech?
Someone that has a scanner, not so much too read codes; but to evaluate sensor(s) inputs; as to whether they are inputting “normal” values.
There maybe a sensor that is still within its operating range as to not set a code; but is at its extreme end of its range, causing this issue?
Dan.
Canadian "EH"
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