gsirick
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Registered: 18th Feb 07
Location: mid-wales
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how would you tell if the cat is fooked on a gsi without taking it off?
have noticed my gsi back-firing and popping recently and im not sure if the cat mite be fooked.
would take it off but im not a fan of re-fitting exhaust systems with just a jack holding the car up.
[Edited on 09-09-2007 by gsirick]
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BarnshaW
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Registered: 25th Oct 06
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backfiring and popping is usually over fuelling? im not sure the cat would be the first place to start?
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gsirick
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Registered: 18th Feb 07
Location: mid-wales
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would there be a fault if it were over fueling tho?
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BarnshaW
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Registered: 25th Oct 06
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Try serviceing it , new lambda sensor, temp sensor, clean air filter
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gsirick
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Registered: 18th Feb 07
Location: mid-wales
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its had a new temp sensor as i had another engine fitted a month ago, so plugs and leads are new air filter is a courtenay panel filter which is clean.
could it have anything to do with it having a de-restrictive drilled airbox?
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BarnshaW
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Registered: 25th Oct 06
User status: Offline
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i very much doubt its to do with a derestricted airbox. normally a sensor or plug/lead etc.
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gsirick
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Registered: 18th Feb 07
Location: mid-wales
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i thought if a sensor was playing up the eml would come on and there would be a fault code. have done a diagnostic test and no codes where found.
where is the lamba sensor?
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BarnshaW
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Registered: 25th Oct 06
User status: Offline
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underside of the exhaust manifold
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gsirick
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Registered: 18th Feb 07
Location: mid-wales
User status: Offline
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the plug that goes into the manifold?
ive got a protech exhaust manifold and the sensor is in 1 outlet not where it should be (into all4)
will blanking it off until i get i moved help?
and would checking the spark plugs indicate over fueling?
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BarnshaW
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Registered: 25th Oct 06
User status: Offline
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if there black on the spark plugs this is a sign of over fuelling. possibly blanking it off may help but i only had experience with a standard manifold.
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Gazdaman
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Registered: 30th Aug 07
Location: Leicester
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Feel free to take this with a pinch of salt, I'm a biker really.
But popping etc on a bike is usually air getting into the exhaust system, normally a broken clamp or similar.
Gaz
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gsirick
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Registered: 18th Feb 07
Location: mid-wales
User status: Offline
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it is because of the lamba sensor on the exhaust manifold.
just checked on ngk website and it will back fire and pop as the gases are only passing the sensor on 1 outlet not all 4 so 3 outlets are missing the sensor completly.
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gsirick
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Registered: 18th Feb 07
Location: mid-wales
User status: Offline
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have checked spark plugs and 1,3 and 4 are normal but 2 was black.
also have noticed black shit coming out the exhaust.
would fitting the lamba sensor in the correct place cure this?
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BarnshaW
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Registered: 25th Oct 06
User status: Offline
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i would think that the sensor is playing the part in the over fuelling yes.
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gsirick
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Registered: 18th Feb 07
Location: mid-wales
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i will get it moved then this week, as it costing me a fortune to run at the moment especially as i use V-power and not normal un leaded.
would this also be why im getting black shit coming out the exhaust?
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BarnshaW
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Registered: 25th Oct 06
User status: Offline
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the blackness is from the over fuelling although ul get a certain amount of soot like on all cars...
[Edited on 09-09-2007 by BarnshaW]
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leekeefy
Member
Registered: 8th Sep 07
Location: manchester
User status: Offline
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has the idle gone up?
check for air leak on 1 way valve on servo pipe,thats what has just caused mine to overfuel
Lee
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