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04-05-13, 07:00 PM
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#1
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Member
Join Date: Feb 2013
Posts: 14
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Intermittent knocking noise
Hi all, I have an intermittent knocking noise coming from my engine. Today I replaced the inlet manifold, well I say replaced I removed the internals from it and replaced the spark plugs. I cant say that I noticed the knocking noise before, but then the manifold was probably causing it. The car drives perfectly, no hesitation and also idles perfectly. The noise in question, is as I say, very intermittent. It can happen when the car is cold, when its hot, and will come and go when driving the car. It sounds very much like the inlet manifold, but it cant be, and it still happens with both VIS unplugged. Any ideas please? I can try and get a video if it helps, but it doesn't always do it! 
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04-05-13, 07:13 PM
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#2
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Member
Join Date: May 2012
Location: Odiham
Posts: 1,335
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Knocking? Or ticking? Are you sure it isnt just the purge valve?
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04-05-13, 07:14 PM
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#3
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Member
Join Date: Feb 2008
Location: UK
Posts: 10,493
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If you've gutted the internals the vis wont do anything anyway.
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Former custodian of the legend that was FE54 - RIP
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04-05-13, 07:15 PM
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#4
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Member
Join Date: Feb 2008
Location: UK
Posts: 10,493
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Quote:
Originally Posted by POMPSKI
Knocking? Or ticking? Are you sure it isnt just the purge valve?
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This is simple to test, just unplug the purge valve.
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Former custodian of the legend that was FE54 - RIP
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04-05-13, 07:16 PM
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#5
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Technical Expert R.I.P.
Join Date: Aug 2007
Posts: 9,239
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The plug for the purge valve is on the intake just after the throttle body, when it starts tapping disconnect the plug, if the noise goes, you've found the cause.
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R.I.P. Peter David Scott 18.07.59 to 21.11.16
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04-05-13, 07:21 PM
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#6
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Member
Join Date: May 2012
Location: Odiham
Posts: 1,335
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And if it is the cause, it is working perfectly fine 
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04-05-13, 07:27 PM
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#7
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Technical Expert R.I.P.
Join Date: Aug 2007
Posts: 9,239
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The purge valve is the black cylindrical bit just after the t/b, it has a pipe to the charcoal canister and a electrical plug
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__________________
It never got fast enough for me
Hunter S Thompson
R.I.P. Peter David Scott 18.07.59 to 21.11.16
Will be missed by us all but we will always remember you.
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04-05-13, 07:37 PM
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#8
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Member
Join Date: Feb 2013
Posts: 14
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Thanks for the response guys, but no its not the purge valve, it does make a noise but still present with it disconnected. Its more of a knocking noise really, maybe loose spark plug, but wouldn't be intermittent. I went out to the car earlier with a screwdriver to pinpoint it further and was quiet as a mouse, although when driving along earlier sounded terrible. It gets more audible with the more revs that are applied.
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04-05-13, 09:45 PM
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#9
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Site Owner
Join Date: Jul 2007
Location: Waterlooville, Hants
Posts: 24,097
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When did it last have a decent oil change? Could be a noisey cam lifter not getting sufficient oil?
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