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Author Topic: 2.5v6 surging  (Read 967 times)

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bruiser5050

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2.5v6 surging
« on: 15 August 2011, 20:34:52 »
Hello all , bit difficult to describe this one , car starts and runs fine , but after about 5 mins or so if im sitting at 60mph the engine revs fluctuate up and down by about 300-400 rpm up and down. if i make the auto box kick down it will clear for about 30 secs then return , was told it could be lambda issue so changed both of these , problem still exists , done paper clip test and no engine faults present ,

any help would be greatly appreciated

many thanks   ,   Mat
« Last Edit: 15 August 2011, 20:38:39 by bruiser5050 »
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MutantCav

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Re: 2.5v6 surging
« Reply #1 on: 15 August 2011, 21:06:53 »
Whats your location mate?? Worth updating your profile to say so your not constantly asked :y
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johnnycboy

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Re: 2.5v6 surging
« Reply #2 on: 15 August 2011, 21:07:42 »
from memory maybe the ICV needs a good clean.
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bruiser5050

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Re: 2.5v6 surging
« Reply #3 on: 15 August 2011, 21:14:19 »
profile updated , ICV  , is this the push fit one on the right hand side of the plenum?

Mat
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RobG

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Re: 2.5v6 surging
« Reply #4 on: 15 August 2011, 21:14:55 »
Yep
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bruiser5050

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Re: 2.5v6 surging
« Reply #5 on: 15 August 2011, 21:32:21 »
cool , i'll have a go at that tomorrow morning and let you know how i get on ,

cheers

Mat
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Abiton

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Re: 2.5v6 surging
« Reply #6 on: 15 August 2011, 21:49:08 »
Wouldn't this more likely be an EGR problem, perhaps needing a clean?

Idle control valve surely is only active when throttle is closed, which wouldn't seem to be consistent with the fault occuring at 60mph.  :-/
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bruiser5050

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Re: 2.5v6 surging
« Reply #7 on: 15 August 2011, 22:15:47 »
wheres the egr valve located???

Mat
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MutantCav

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Re: 2.5v6 surging
« Reply #8 on: 15 August 2011, 22:53:14 »
The EGR valve is on the left of the plenum with the copper pipe running out of it...
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bruiser5050

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Re: 2.5v6 surging
« Reply #9 on: 16 August 2011, 20:40:23 »
well removed egr and idle control as well as the throttle body , cleaned them all out , loads of crud in the throttle body , egr valve looks new , prob only 12months old , put everything back .
tried to start and flat battery wtf!!

battery only 2 weeks old , now this may sound daft but would this cause running problems as i have an 2002 astra that wouldnt rev and kept cutting out , turned out the battery was that shot that it was pulling the voltage down throught the car. Could this happen , even if the battery is new , could something else on the car be pulling the voltage down so that when cruising it is cutting out the ecu could compensate making it surge ??????

only a thought :)

Mat
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