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au 5.0L occasionly lacks acceleration 

 

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 Post subject: au 5.0L occasionly lacks acceleration
Posted: Tue Aug 30, 2011 4:04 pm 
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Howdy, I have noticed lately that a every now and again as I am driving normaly and try to accelerate the motor seems to die in the a*** for a few seconds and then comes to life, I have over the past few months replaced most everything (oxy sensors, plugs, leads,coil packs, injectors,) and cleaned the MAF. I noticed on closer inspection that the harmonic balancer has a bit of a wobble in it and was thinking it may be causing a timing problem. Can anyone tell me if I am on the right track thanks.

 

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 Post subject: Re: au 5.0L occasionly lacks acceleration
Posted: Tue Aug 30, 2011 7:27 pm 
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Crank encoder wheel is attached to the hub so if the outer slips it doesn't affect timing.
Change your fuel filter and check your pump flow.
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 Post subject: Re: au 5.0L occasionly lacks acceleration
Posted: Tue Aug 30, 2011 10:48 pm 
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ok will do, thanks

 

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 Post subject: Re: au 5.0L occasionly lacks acceleration
Posted: Wed Aug 31, 2011 12:13 am 
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If the balancer is R.S ?? It should be replaced.. More so on external balanced engines..

 

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 Post subject: Re: au 5.0L occasionly lacks acceleration
Posted: Wed Aug 31, 2011 12:40 am 
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is there a permissable amount of movement in the balancer or should it run dead straight ?

 

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 Post subject: Re: au 5.0L occasionly lacks acceleration
Posted: Wed Aug 31, 2011 11:04 am 
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There should never be any movement on your balancer.

 

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 Post subject: Re: au 5.0L occasionly lacks acceleration
Posted: Wed Aug 31, 2011 9:05 pm 
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I have probably worded it wrong , but what I mean by movement is the harmonic balancer with a slight wobble when the motor is running but does not move on the hub itself.

 

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 Post subject: Re: au 5.0L occasionly lacks acceleration
Posted: Wed Aug 31, 2011 10:53 pm 
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Even so there should be no runout in any direction. The outer will usually have runout if the rubber between it and the inner hub is failing.
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 Post subject: Re: au 5.0L occasionly lacks acceleration
Posted: Wed Aug 31, 2011 11:26 pm 
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Thanks , I will replace it , cheers

 

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