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kenthepipe
 Post subject: 80 4.7S Surging back and forth ?
PostPosted: Mon Nov 07, 2011 5:35 pm 
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Joined: Wed Oct 27, 2010 11:15 am
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Any ideas what causes the problem of surging back and forth at about 1300 to 2000 rpm,s it,s the sort of sensation you get when in the wrong gear for a given situation ( although I,m not) manual box. ?
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Brett928S2
 Post subject: Re: 80 4.7S Surging back and forth ?
PostPosted: Mon Nov 07, 2011 11:23 pm 
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Joined: Mon Nov 05, 2007 3:15 pm
Posts: 2410
Location: BOURNEMOUTH
Hi Ken :)

Its got to be either an air leak or a vacuum leak...

Is the tickover steady at around 800 rpm.. ?

All the best Brett :)

_________________
928S2 AUTO V8 4.7 1986-XPIPES ANDERSON RACE EXHAUST,K&N, WIZARDS OF NOS MAXX RACE CONTROLLER & WON RACE REVO NITROUS KIT 2000 HP CAPABLE.
 -UK 928 1/4 Mile and Top Speed Record Holder-208.10 mph- Email managingdirector@pchealthcare.co.uk

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Brett928S2
 Post subject: Re: 80 4.7S Surging back and forth ?
PostPosted: Tue Nov 08, 2011 12:34 am 
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Hi :)

I just saw your other post on Rennlist..

You are kidding about the plugs being 5 years old I HOPE ?

If not...then CHANGE the plugs, both dizzy caps and both rotor arms...now...lol


Then see what its like...also when were the fuel filter and air filter last changed ? not looked at but actually changed ?

All the best Brett :)

_________________
928S2 AUTO V8 4.7 1986-XPIPES ANDERSON RACE EXHAUST,K&N, WIZARDS OF NOS MAXX RACE CONTROLLER & WON RACE REVO NITROUS KIT 2000 HP CAPABLE.
 -UK 928 1/4 Mile and Top Speed Record Holder-208.10 mph- Email managingdirector@pchealthcare.co.uk

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kenthepipe
 Post subject: Re: 80 4.7S Surging back and forth ?
PostPosted: Tue Nov 08, 2011 9:51 am 
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yes I guess that I should also eliminate those, thought there might be a common denominator :?
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