jamesy1990
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Registered: 15th Dec 08
Location: fife
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hey . im having problems with my corsa sport x16xe . i recently fitted a decat and 4 branch manifold i removed the ait con whilst doing . once everything was back togeather it took it for a test run everything seemed ok but then a week later it started missing but only when engine got warm and there is no engine managment light coming up :S . its nothing to do with leads or plugs as i done them whilst doing my manifold im totaly stumped on this so and advice would be appreciated!
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Tiger
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Registered: 12th Jun 01
Location: Leicestershire Drives:Astra VXR
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It might not be a problem associated with your mods. The heads are prone to going porous, it could be a problem like that.
Alternatively, it could be your MAS, but that should have given you a fault light. Try unplugging your MAS while the engine is running and see if it brings up your ECU warning light.
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jamesy1990
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Registered: 15th Dec 08
Location: fife
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im new to eco tec and im realy realy regreting it . whats the MAS? nah the heads ok i changed the oil last week and there was no sign of water in my oil
[Edited on 13-12-2009 by jamesy1990]
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Tiger
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Registered: 12th Jun 01
Location: Leicestershire Drives:Astra VXR
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Its the Mass Air Sensor thats on the duct between your airbox and your injectors if I remember rightly (been 9 years since I had my old GSi now).......Should be a plug on the loom connecting the loom to your MAS - if you take the MAS apart, its just 3 resistors connected by very very fine wires, of which you should not break or damage!!! So I found out upon fitting a K&N 57i which shook my MAS to bits.
[Edited on 13-12-2009 by Tiger]
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jamesy1990
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Registered: 15th Dec 08
Location: fife
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oww the air flow meter yeah i kn0ow its a common problem i will try and let u know how it goes mate thanks 
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jamesy1990
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Registered: 15th Dec 08
Location: fife
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i have tried that and no joy . im thinking it could may be the temp sender anyone else had this problem ?
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SportBoy
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Registered: 5th Oct 01
Location: Retford, Nottinghamshire
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if its missing when warm is normally somthing to do with plugs/leads or coilpack .. and you car doesnt have a airflow meter it uses a map sensor which bolts to the bulkhead. if the vac pipe to that has a split in it that will cause it to run shyt.
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Tiger
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Registered: 12th Jun 01
Location: Leicestershire Drives:Astra VXR
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Is it missing on just one cyl.? If it is, find out which one and start working from there, plugs, fittings etc...Check the spark when the engine is warm too on the cyl. that's missing. Could be a coilpack for the cylinder gone down.
Like I said, My MAS went, and only misfired when it was warm......When I stripped it, one of the filaments had broken inside, it sounds very similar to your problem.
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SportBoy
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Registered: 5th Oct 01
Location: Retford, Nottinghamshire
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his wont have a mas as its a x16 .. you had a gsi which is a c16 and that does have a mas 
take the plugs out and look at the colour of the tips , if one is a slightly diff colour you know its either that lead / plug or coilpack.
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Linch
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Registered: 4th May 06
Location: Whickham, Tyne and Wear
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quote:
Originally posted by Tiger
The heads are prone to going porous, it could be a problem like that.
Are They 
And as said if its only doing it when its warm could be the coil pack...they do dissipate inside with getting hot.
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Tiger
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Registered: 12th Jun 01
Location: Leicestershire Drives:Astra VXR
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quote:
Originally posted by Linch
quote:
Originally posted by Tiger
The heads are prone to going porous, it could be a problem like that.
Are They
Yeah, the 'C' engines were anyway.
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ChrisJ 16V
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Registered: 13th Dec 09
Location: Mid Wales
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Did the new 4 branch allow the use of the EGR valve? maybe this has something to do with the running of the car?
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Richardhhha
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Registered: 29th Sep 07
Location: Croydon, Greater London
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if the egr was going up the swanny it would run like a bag of nails all the time,
and that silver thing on the manifold isnt a egr its part of the SAI
loking more like the coil pack is breaking down when getting hot,
try doing a paper clip test even tho the eml isnt on it will still log faults and will tell you them with a paper clip test
[Edited on 14-12-2009 by Richardhhha]
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jamesy1990
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Registered: 15th Dec 08
Location: fife
User status: Offline
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problem solved thanks for the advice guys . i ended up taking the inlet manifold off to see behind it turned out the wireing was a mess and the cam sensor wire was bared back and the 3 wires that ran through the core were all touching ! runs sweet as a nut now
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