Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: Chuffy on 08 February 2010, 19:17:35
-
Hi everyone!
I hope somebody can help me if it all possible.
I have Omega 2.2 petrol, manual transmission. Engine is Y22XE.
Car has been off the road a long time, its along story so I won't eleborate!
Car is back on road now, but has a slight misfire at idle and up to about 1600rpm. At high engine speeds it is fine.
Took it for mot and diagnostics today. It failed the mot, emissions too high.
Fault codes were, P0100 Maf sensor signal too low and P0170 fuel trim system rich.
When pressing the throttle open from idle, car hesitates, I can hear like a pre-ignition knock, then takes an awful long time to drop back to idle. Exhaust sounds very 'splashy' and uneven on idle. I always thought this indicated a weak mixture but computer says rich.
Just a few pointers would be heelpful, I'm fairly hand with a voltmeter and some spanners, quite good at wielding a hammer too!
Thanks.
-
I'd like to see live data before condemming maf, esp as you have a fuel trim fault as well
-
Its screaming air leak ......
-
Thanks for replies. Unfortunately I haven't got the live data with me, its in the car at the garage. I can get it tomorrow. Thinking possible air leak myself, had a quick look but couldn't locate a leak. I'll have a better look tomorrow.
Cheers.
Would I be correct in thinking that a big air leak would cause the the system to try and compensate by richening the mixture too much? Emissions were very high, 1250 at idle if i remember correctly.
-
Hi everyone!
I hope somebody can help me if it all possible.
I have Omega 2.2 petrol, manual transmission. Engine is Y22XE.
Car has been off the road a long time, its along story so I won't eleborate!
Car is back on road now, but has a slight misfire at idle and up to about 1600rpm. At high engine speeds it is fine.
Took it for mot and diagnostics today. It failed the mot, emissions too high.
Fault codes were, P0100 Maf sensor signal too low and P0170 fuel trim system rich.
When pressing the throttle open from idle, car hesitates, I can hear like a pre-ignition knock, then takes an awful long time to drop back to idle. Exhaust sounds very 'splashy' and uneven on idle. I always thought this indicated a weak mixture but computer says rich.
Just a few pointers would be heelpful, I'm fairly hand with a voltmeter and some spanners, quite good at wielding a hammer too!
Thanks.
what job was done recently ?
if you are suspicious about MAF just disconnect it and try..
-
Thanks for replies. Unfortunately I haven't got the live data with me, its in the car at the garage. I can get it tomorrow. Thinking possible air leak myself, had a quick look but couldn't locate a leak. I'll have a better look tomorrow.
Cheers.
Would I be correct in thinking that a big air leak would cause the the system to try and compensate by richening the mixture too much? Emissions were very high, 1250 at idle if i remember correctly.
yes!
-
Thanks very much The Boy. :y Thats the answer I was hoping for. Now to find the wretched leak!
Hope it is't the manifold gasket, it looks a right old rave to get off.
Thanks again.
-
how long has it been of the road???
-
It's been off the road since December 2008. I gave up trying to fix it. The problem i have with it now is not the reason it was taken off the road. That is a long, long story!
-
miggys tend to have more than 1 fault, hoping yours is only a leak :-/
-
Yeah, tell me about it! Had 4 Omegas, this is definitely the final one. Never known a car so fragile. I repect all the guys on here for keeping the faith but I'm afraid I lost it a long time ago.
-
Yeah, tell me about it! Had 4 Omegas, this is definitely the final one. Never known a car so fragile. I repect all the guys on here for keeping the faith but I'm afraid I lost it a long time ago.
I can bet my only 1 miggy had more faults than your total of 4 miggies ;D :y