Topic: Air noise when first started (Read 1898 times)

harpersimon · « **on:** 26 May 2010, 18:30:18 »

Do these all make a sound like a small air compressor when started? goes away after 30 or so seconds..

tunnie · « **Reply #1 on:** 26 May 2010, 18:31:49 »

secondary air injection, its not needed, just unplug it or the fuse for it

harpersimon · « **Reply #2 on:** 26 May 2010, 18:34:47 »

see.. lost me straight away there.. :-) being a newbie.
Secondary Air injection.. and not needed - where would I 'unplug it' - I don't know what it is making the noise LOL before I go unplugging things. so they all do it then - its not about to blow up

tunnie · « **Reply #3 on:** 26 May 2010, 18:37:19 »

passenger side of the front bumper, can't miss it. I forget which fuse to pull which is the easier way, sure someone can confirm which one shortly

harpersimon · « **Reply #4 on:** 26 May 2010, 18:46:23 »

can I ask what its doing/there for if not needed?.. the noise seems to come from the Engine bay, not the bumper.. are we talking about the same thing?

tunnie · « **Reply #5 on:** 26 May 2010, 18:50:13 »

basically fresh air is injected into exhaust gasses to make sure there is a 'fuller' burn, and its used when cold. As its running rich on start up, helps burn off more, and reduce emissions when cold.

As MOT emissions are done when hot, its not needed

Andy B · « **Reply #6 on:** 26 May 2010, 18:55:01 »

If your noise is from the passenger side, then it's the SAI as suggested. I think it's more likely to be a noise from the driver's side front wing/bumper where the compressor for the Elite's self levelling suspension lives. If so, then it's perfectly normal

Abiton · « **Reply #7 on:** 26 May 2010, 18:55:34 »

If it's a tappy sort of noise, it could be tappets (

), in which case an oil change may help reduce the noise.

If it's more of a 'Hoover' type noise, it could well be the SAI pump getting tired/sickly. Stick your head under the front bumper just in front of the passenger-side wheel while someone else starts it (make sure it's got handbrake on and not in gear...). If that's where the noise is then that's the SAI pump making it.

Never had any trouble with ours so can't advise on disabling it. It's 'only' there to reduce cold-start emissions and to heat up the cats more rapidly, neither function is crucial.

harpersimon · « **Reply #8 on:** 26 May 2010, 19:07:33 »

tell you what, you lads all know your stuff.. been on some forums in my time and some are just full of teenagers driving to fast - this one has some great advice from knowledgable people
I'll stick my head under the bonnet and see if I can locate which side it comes from on start up..

harpersimon · « **Reply #9 on:** 26 May 2010, 19:09:01 »

Quote

tell you what, you lads all know your stuff.. been on some forums in my time and some are just full of teenagers driving to fast - this one has some great advice from knowledgable people
I'll stick my head under the bonnet and see if I can locate which side it comes from on start up..

Not tappets.. more hoover / compressor sort of thing.. but as I said stops after about 30 secs.. maybe less if I haven't turned if off long ago.

tunnie · « **Reply #10 on:** 26 May 2010, 19:09:28 »

also watch the back of the car, if its Self Levelling pump the back end of the car will either rise up or lower

eliteomegaman · « **Reply #11 on:** 26 May 2010, 20:38:07 »

Have the same noise myself & its DEFO the sai as pointed out.

It goes after 30 secs & if you put your ear to the front passenger side tyre u will hear it - honest!

I'd like to know which fuse is the one for it so i can pull it out if that's possible?

bigtow · « **Reply #12 on:** 26 May 2010, 20:56:43 »

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also watch the back of the car, if its Self Levelling pump the back end of the car will either rise up or lower

if it does turn out to be compressor for suspention i would want to find out where it is leaking air from as mine doesnt pump itself up evey time i start if from cold

?

harpersimon · « **Reply #13 on:** 26 May 2010, 20:59:35 »

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Have the same noise myself & its DEFO the sai as pointed out.

It goes after 30 secs & if you put your ear to the front passenger side tyre u will hear it - honest!

I'd like to know which fuse is the one for it so i can pull it out if that's possible?

I'll put my ear that side tomorrow then. Just sounds like its coming from the engine bay but then I haven't been stood infront listening to the car when I start it!

Omegafantasy · « **Reply #14 on:** 26 May 2010, 21:47:05 »

On my 95 Omega it's the rear pair of fuses in the engine bay box, a 50 amp in my case. Can't remember what number it was.

Radar · « **Reply #15 on:** 26 May 2010, 22:18:24 »

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Have the same noise myself & its DEFO the sai as pointed out.

It goes after 30 secs & if you put your ear to the front passenger side tyre u will hear it - honest!

I'd like to know which fuse is the one for it so i can pull it out if that's possible?

This link should helphttp://www.omegaowners.com/forum/YaBB.pl?num=1270732220/2

bigtow · « **Reply #16 on:** 26 May 2010, 22:23:56 »

reposting link http://www.omegaowners.com/forum/YaBB.pl?num=1270732220/2

Radar · « **Reply #17 on:** 26 May 2010, 22:28:51 »

Nice one, i think i got some of the letters too close together. Watching have i got news for you at the same time

harpersimon · « **Reply #18 on:** 26 May 2010, 22:40:19 »

and this fuse only disables the SAI pump.. nothing else I assume..

eliteomegaman · « **Reply #19 on:** 26 May 2010, 22:49:19 »

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reposting link http://[highlight]http://www.omegaowners.com/forum/YaBB.pl?num=1270732220/2[/[/highlight]quote]

Cheers for that but i'm confused.com!! :-/

On this link to RobG he states it's 'fuse 29A' BUT in the engine fuse box it's got No.1 K12 Brown for the SAI so which fuse is it please??!!

Andy B · « **Reply #20 on:** 26 May 2010, 22:52:23 »

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and this fuse only disables the SAI pump.. nothing else I assume..

You sure it's the SAI then? When fubar'd you have no doubt as to where the noise is coming from

harpersimon · « **Reply #21 on:** 26 May 2010, 22:53:07 »

No.1 K12 Brown.... is the relay I think. Fuse is 29a in the corner of the box

harpersimon · « **Reply #22 on:** 26 May 2010, 22:54:16 »

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Quote
and this fuse only disables the SAI pump.. nothing else I assume..

You sure it's the SAI then? When fubar'd you have no doubt as to where the noise is coming from

sorry - this was a question not a statement - I haven't touched it yet! :-) - I am asking if this magic fuse ONLY disables the SAI? I don't like pulling fuses out just to turn something off.. ideally..

Andy B · « **Reply #23 on:** 26 May 2010, 22:57:39 »

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Quote
Quote
and this fuse only disables the SAI pump.. nothing else I assume..

You sure it's the SAI then? When fubar'd you have no doubt as to where the noise is coming from

sorry - this was a question not a statement - I haven't touched it yet! :-) - I am asking if this magic fuse ONLY disables the SAI? I don't like pulling fuses out just to turn something off.. ideally..

Fuse 27 is just for the level compressor if you want to try that first

bigtow · « **Reply #24 on:** 26 May 2010, 23:09:48 »

just been doing some searching around and susposidly pulling the fuse will turn on the eml light but unpluging the unit under the wing doesent

Erzy · « **Reply #25 on:** 27 May 2010, 00:44:27 »

This may be a muppet of a question but, " does the 2.2 have a SAI pump ? "

Erzy · « **Reply #26 on:** 28 May 2010, 01:13:56 »

Anyone

Andy B · « **Reply #27 on:** 28 May 2010, 05:55:57 »

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Anyone

I doubt it, but have a look. Front nearside of engine bay.

harpersimon · « **Reply #28 on:** 28 May 2010, 10:26:34 »

did some listening - and my noise seems to come from the top! so you know where the 4 breather pipes run across the top of the engine/plenum (I guess..) the air sound comes from there, then stops dead after 30 secs or so. I think its the SAI making it but I can hear the air, not the compressor as there is no specific noise from one side of front of engine bay or other.

TheBoy · « **Reply #29 on:** 28 May 2010, 11:26:36 »

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This may be a muppet of a question but, " does the 2.2 have a SAI pump ? "

No

TheBoy · « **Reply #30 on:** 28 May 2010, 11:34:14 »

If anyone does, for whatever reason, want a quiet one, I have one here going cheap.

But lets just say I unplugged my noisy one on the MV6, and won't be fitting the quiet one in its place

harpersimon · « **Reply #31 on:** 28 May 2010, 12:11:56 »

Actually had another listen... Does seem to sound like something stops spinning around when the air noise stops so am convinced it's sai compressor. I'll live with it. !!

TheBoy · « **Reply #32 on:** 28 May 2010, 15:58:43 »

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Actually had another listen... Does seem to sound like something stops spinning around when the air noise stops so am convinced it's sai compressor. I'll live with it. !!

Unplug it, that will prove it. Its a single large connector on top of the motor itself. Reachable from underneath, but if you want to remove bumper, then you can see it...

harpersimon · « **Reply #33 on:** 28 May 2010, 16:41:14 »

This may not be clear - but there is a long black squashy hose running along the right side of the Plenum (if thats the big silver bit on top!) the front end connects to one of the 2 air ram pipes, the other goes off to the bulkhead somewhere. If I squeeze this pipe when the noise is being generated, it makes a difference / gets quieter - would that point at SAI (sorry for the frankly 12 year old description!)

Radar · « **Reply #34 on:** 29 May 2010, 11:15:32 »

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This may not be clear - but there is a long black squashy hose running along the right side of the Plenum (if thats the big silver bit on top!) the front end connects to one of the 2 air ram pipes, the other goes off to the bulkhead somewhere. If I squeeze this pipe when the noise is being generated, it makes a difference / gets quieter - would that point at SAI (sorry for the frankly 12 year old description!)

I doubt it, sounds like you are describing the breather pipe which runs down to the exhaust.

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Author Topic: Air noise when first started (Read 1898 times)

Abiton