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[calibrated]

My ecu throw up recently codes P0130 - P0150... i checked and they are connected to the oxygen sensors that are running near the precats so my questions are as follows:

1.
I hear a rumbling noise on startup ,and when accelerating it seems that comes arround manifolds - possibly a manifold to downpipe gasket failure,could this trigger the sensors error?

2. If Yes to 1st question,could it be reason that i am getting a 22 MPG fuel economy on a perfectly straight road doing 80mph,or this sounds like normal consumption... 3.2 estate with auto box...

3. I tried to find on forum,but did not suceed,if anyone has put 3.0 downpipes that have no pre cats,how the car reacted,and what to do with 2 oxygen sensors then,will they trigger the error,or do i need to switch them off in some mapping session or whatever?

Thanks in advance

[TheBoy]

Are the fuel trims off? If so, check for air leaks in intake and exhaust

[calibrated]

Sorted the plugs,they looked like they have 100 000 miles,no visible electrode...fixed the leaks in vacuum system...i must still sort the exhaust leak though...i will put downpipes from 3.0 liter and weld the first oxygen sensors before rear cats,so the error is not triggered....

Now i get on ,cruising between 80mph and 100mph, fully loaded trunk ,full fuel tank ,2 persons and 235 45 17 tyres...25mpg on average which i find pretty ok...




convert caps to lowercase

[TheBoy]

Superb, thanks for coming back with the cure for the fault, it will help others

So mostly the plugs were knackered, but also a vac leak?

[olm]

Interesting about the vacuum leaks, could you tell us where those leaks were?

[calibrated]

Superb, thanks for coming back with the cure for the fault, it will help others

So mostly the plugs were knackered, but also a vac leak?

Yes,vacuum leak where small pipe connects to brake booster and sends vacuum to multirams,inside heating controls,etc...
Broken small hose on crankcase ventilation,etc...i will check one more time all vacuum connections... still getting lambda sensor errors regarding exhaust leak....i will sort it out these days and report back...

[calibrated]

Also,breather was completely blocked...cleaning the brather hoses,plastic breather on intake,throttle body,and crankcase ventilation canister...the instant fuel consumption in idle ,reduced from 2.1 liter per hour to 1.4 liter per hour with much more stable idle...

[TheBoy]

Worth checking/cleaning breathers as part of annual checks, they are prone to starting to block on the Omega.

[calibrated]

Just to help others...i sourced x30xe downpipes,welded sensors 10 inches before and after converter...no error,0.5 L smaller consumption,and engine does feel more powerful when you accelerate from 2500 rpm in 3/4 gear...