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Topic: Vacuum probs? (Read 1560 times) |
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mk1boy
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Vacuum probs?
« on: Mar 26th, 2012, 10:38pm » |
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Hi, The other day, belting up a local hill, there was a sudden noise a bit like a gasket/exhaust blowing and power started to tail off. To cut a long story short, it hasn't got better on its own and, having had it looked at by a friendly mechanic, I'm none the wiser. The two rubber hoses that seem to come from a vacuum unit by the exhaust manifold had come off - when I put them back on again and revved the engine, they came off again! I can only assume they are something to go with the vacuum system because the car is absolutely gutless when on any incline but will run like normal on the flat. I have put new hoses on and they seem to stay fixed but this is the car's last chance - I told it that if it gave me any more trouble it would be appearing in the 'breaking for spares' section this weekend....
cheers
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gozz
Senior Member
Been around awhile
Posts: 3475
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Re: Vacuum probs?
« Reply #1 on: Mar 26th, 2012, 11:08pm » |
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There is a fair chance your cat has collapsed,causing back pressure.
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Simmo
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Re: Vacuum probs?
« Reply #2 on: Mar 27th, 2012, 7:31am » |
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I agree with Gozz. There is a article on this somewhere on the site but I can't locate it at the moment. IIRC the fact that the hoses have blown off is a classic sign and the symptoms are exactly as described in Fault Finder.
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Now I'm an OAP
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leewar
Senior Member
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Re: Vacuum probs?
« Reply #3 on: Mar 27th, 2012, 10:32am » |
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I had this trouble with the vacuum hoses blowing off and sure enough the cat was the problem. Changing it was the cure  Lee
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mk1boy
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Re: Vacuum probs?
« Reply #4 on: Mar 28th, 2012, 4:51pm » |
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thanks guys. I did take it to a local exhaust centre because it first sounded like the exhaust had blown and they looked underneath and said it was ok. There is also a high pitched squeky whistling noise whenever I accelerate - does that confrim the diagnosis?
ps - a cat will be cheap, won't it 
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mk1boy
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Re: Vacuum probs?
« Reply #6 on: Mar 31st, 2012, 8:53am » |
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thanks for the link - cheaper than I thought! Hope that does the trick
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Scorpio_Mike
Senior Member
Jeep Grand Cherokee 3.0 V6 & 2.8 Sierra XR4i 4x4
Posts: 2354
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Re: Vacuum probs?
« Reply #7 on: Mar 31st, 2012, 9:33am » |
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You only need to fit a Type Approved Cat [ i.e. more expensive  ] if your car was first registered after 01/03/2001.
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Star sign is Scorpio !
Sierra XR4i's are great...especially when fitted with 4WD 
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5stud
Full Member
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Posts: 436
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Re: Vacuum probs?
« Reply #8 on: Mar 31st, 2012, 10:20am » |
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have a look on ebay natinalclearanecentre making £46 at the moment and its genuine not a mickey mouse one ther over £800
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: Vacuum probs?
« Reply #9 on: Apr 3rd, 2012, 12:56pm » |
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on Mar 28th, 2012, 4:51pm, mk1boy wrote:| I did take it to a local exhaust centre because it first sounded like the exhaust had blown and they looked underneath and said it was ok. |
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These are the hoses for the pressure sensor for the EGR control yes?
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Mike H
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leewar
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Re: Vacuum probs?
« Reply #10 on: Apr 3rd, 2012, 1:42pm » |
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That's right Mike. Under pressure from a blocked cat they blow off
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: Vacuum probs?
« Reply #11 on: Apr 3rd, 2012, 4:05pm » |
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Probably just as well, like a "safety valve" 
All seems to point to that then.
NB: my before was re: the exhaust fit people not thinking anything might be wrong with the cat because it looked OK from the outside.
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Mike H
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mk1boy
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Re: Vacuum probs?
« Reply #12 on: Apr 22nd, 2012, 9:54pm » |
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Hi guys, new cat fitted - problem solved!
thanks for all your help.
Had to take the exhaust manifold off to get at the bolts - now I need to track down a manifold gasket...
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Tompion
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1997 2.3 Ultima estate.
Posts: 2918
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Re: Vacuum probs?
« Reply #13 on: Apr 24th, 2012, 6:49pm » |
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The 2.3 exhaust manifold gasket part number is 7087454
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ABS multiplug wheel sensor pins MK IV or MK 20
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