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Author Topic: Omega 2.6 runs better without MAF  (Read 528 times)

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olm

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Omega 2.6 runs better without MAF
« on: 11 June 2019, 20:00:12 »

Hi, if my car runs better with MAF sensor disconnected, does that mean it's wrong? The car runs like a plane!
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dave the builder

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Re: Omega 2.6 runs better without MAF
« Reply #1 on: 11 June 2019, 20:08:26 »

What prompted you to remove the Maf ?
was it running rough or lacking throttle response  :-\
did you read the ECM fault codes before hand or since ?
removing the MAF defaults to a substitute value map for air intake temperature and flow IIRC 
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STEMO

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Re: Omega 2.6 runs better without MAF
« Reply #2 on: 11 June 2019, 20:14:05 »

Remove some other bits....you never know.  ;D
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dave the builder

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Re: Omega 2.6 runs better without MAF
« Reply #3 on: 11 June 2019, 20:21:28 »

Remove some other bits....you never know.  ;D
what is your school of thought uncle Stemo  :-\
weight reduction = better fuel economy  ;D

pretty sure GM would not have fitted parts if they where not needed  ::)
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Re: Omega 2.6 runs better without MAF
« Reply #4 on: 11 June 2019, 20:37:35 »

Remove some other bits....you never know.  ;D
what is your school of thought uncle Stemo  :-\
weight reduction = better fuel economy  ;D

pretty sure GM would not have fitted parts if they where not needed  ::)
Remove the air filter......more air.....more oooomph.   Seemples  :)
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dave the builder

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Re: Omega 2.6 runs better without MAF
« Reply #5 on: 11 June 2019, 20:47:10 »

Remove some other bits....you never know.  ;D
what is your school of thought uncle Stemo  :-\
weight reduction = better fuel economy  ;D

pretty sure GM would not have fitted parts if they where not needed  ::)
Remove the air filter......more air.....more oooomph.   Seemples  :)
without a MAF, the engine won't know it's getting more air
without an air filter, BIG chunks of rusty subframe and failing front suspension parts will be sucked into the engine  ;D
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Re: Omega 2.6 runs better without MAF
« Reply #6 on: 11 June 2019, 20:53:35 »

Remove some other bits....you never know.  ;D
what is your school of thought uncle Stemo  :-\
weight reduction = better fuel economy  ;D

pretty sure GM would not have fitted parts if they where not needed  ::)
Remove the air filter......more air.....more oooomph.   Seemples  :)
without a MAF, the engine won't know it's getting more air
without an air filter, BIG chunks of rusty subframe and failing front suspension parts will be sucked into the engine  ;D
Yes.....euthanasia. You know it makes sense.  ;D
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dave the builder

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Re: Omega 2.6 runs better without MAF
« Reply #7 on: 11 June 2019, 20:57:10 »

Remove some other bits....you never know.  ;D
what is your school of thought uncle Stemo  :-\
weight reduction = better fuel economy  ;D

pretty sure GM would not have fitted parts if they where not needed  ::)
Remove the air filter......more air.....more oooomph.   Seemples  :)
without a MAF, the engine won't know it's getting more air
without an air filter, BIG chunks of rusty subframe and failing front suspension parts will be sucked into the engine  ;D
Yes.....euthanasia. You know it makes sense.  ;D

 ;D :D
It would save me loads of money off the petrol bill

I'll ask Terry to find me a nice astra  :y
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olm

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Re: Omega 2.6 runs better without MAF
« Reply #8 on: 11 June 2019, 20:57:40 »

What prompted you to remove the Maf ?
was it running rough or lacking throttle response  :-\
did you read the ECM fault codes before hand or since ?
removing the MAF defaults to a substitute value map for air intake temperature and flow IIRC

I have dtc p0173, fuel trim. I have already changed the lambda probes and it remains the same. The MAF can also give that breakdown, that's why I try it
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dave the builder

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Re: Omega 2.6 runs better without MAF
« Reply #9 on: 11 June 2019, 21:08:31 »

What prompted you to remove the Maf ?
was it running rough or lacking throttle response  :-\
did you read the ECM fault codes before hand or since ?
removing the MAF defaults to a substitute value map for air intake temperature and flow IIRC

I have dtc p0173, fuel trim. I have already changed the lambda probes and it remains the same. The MAF can also give that breakdown, that's why I try it
check for air leaks and exhaust leaks
have you got access to a code reader or computer to give live engine data ?
that way you could look at bank 1 fuel trims etc to see if they are close to throwing a code, or if it is just a bank 2 specific problem
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olm

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Re: Omega 2.6 runs better without MAF
« Reply #10 on: 11 June 2019, 21:48:03 »

What prompted you to remove the Maf ?
was it running rough or lacking throttle response  :-\
did you read the ECM fault codes before hand or since ?
removing the MAF defaults to a substitute value map for air intake temperature and flow IIRC

I have dtc p0173, fuel trim. I have already changed the lambda probes and it remains the same. The MAF can also give that breakdown, that's why I try it
check for air leaks and exhaust leaks
have you got access to a code reader or computer to give live engine data ?
that way you could look at bank 1 fuel trims etc to see if they are close to throwing a code, or if it is just a bank 2 specific problem

Yes, I have. The problem is in bank 2  but the bank 1 also does not work well, although better than 2. But the question is, why does it go much better with the MAF disconnected.  do not see air intakes and the emissions got perfect on itv (mot) so the exhaust does not leak
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dave the builder

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Re: Omega 2.6 runs better without MAF
« Reply #11 on: 11 June 2019, 22:15:18 »

What prompted you to remove the Maf ?
was it running rough or lacking throttle response  :-\
did you read the ECM fault codes before hand or since ?
removing the MAF defaults to a substitute value map for air intake temperature and flow IIRC

I have dtc p0173, fuel trim. I have already changed the lambda probes and it remains the same. The MAF can also give that breakdown, that's why I try it
check for air leaks and exhaust leaks
have you got access to a code reader or computer to give live engine data ?
that way you could look at bank 1 fuel trims etc to see if they are close to throwing a code, or if it is just a bank 2 specific problem

Yes, I have. The problem is in bank 2  but the bank 1 also does not work well, although better than 2. But the question is, why does it go much better with the MAF disconnected.  do not see air intakes and the emissions got perfect on itv (mot) so the exhaust does not leak
obviously something has failed since ITV / MOT test for the code to be present
once cleared, how long before the code comes back ?
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Re: Omega 2.6 runs better without MAF
« Reply #12 on: 11 June 2019, 22:25:27 »

Unplugging MAF forces it to run on a fixed set of assumptions. That it runs better unplugged points to the MAF being faulty ;)
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Re: Omega 2.6 runs better without MAF
« Reply #13 on: 12 June 2019, 05:14:49 »

What prompted you to remove the Maf ?
was it running rough or lacking throttle response  :-\
did you read the ECM fault codes before hand or since ?
removing the MAF defaults to a substitute value map for air intake temperature and flow IIRC

I have dtc p0173, fuel trim. I have already changed the lambda probes and it remains the same. The MAF can also give that breakdown, that's why I try it
check for air leaks and exhaust leaks
have you got access to a code reader or computer to give live engine data ?
that way you could look at bank 1 fuel trims etc to see if they are close to throwing a code, or if it is just a bank 2 specific problem

Yes, I have. The problem is in bank 2  but the bank 1 also does not work well, although better than 2. But the question is, why does it go much better with the MAF disconnected.  do not see air intakes and the emissions got perfect on itv (mot) so the exhaust does not leak
obviously something has failed since ITV / MOT test for the code to be present
once cleared, how long before the code comes back ?

Around 30-50 milles
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olm

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Re: Omega 2.6 runs better without MAF
« Reply #14 on: 12 June 2019, 05:19:16 »

Unplugging MAF forces it to run on a fixed set of assumptions. That it runs better unplugged points to the MAF being faulty ;)

Yes right? Is what I imagine, with the MAF unplugged can not go better, right?

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Re: Omega 2.6 runs better without MAF
« Reply #15 on: 12 June 2019, 08:53:20 »

Are both banks showing a fair bit of LTFT?  What is the MAF reading (when plugged in), should be in region of 14kg/hr.

That is how you diagnose stuff, not willy nilly replacement ;)
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Re: Omega 2.6 runs better without MAF
« Reply #16 on: 12 June 2019, 09:06:50 »

Are both banks showing a fair bit of LTFT?  What is the MAF reading (when plugged in), should be in region of 14kg/hr.

That is how you diagnose stuff, not willy nilly replacement ;)


I need more info for more revs and conditions to diagnose
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Re: Omega 2.6 runs better without MAF
« Reply #17 on: 12 June 2019, 09:42:28 »

I had this problem, after looking at maf, it turned out to be the. 135 coil pack.
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Re: Omega 2.6 runs better without MAF
« Reply #18 on: 12 June 2019, 09:55:59 »

I had this problem, after looking at maf, it turned out to be the. 135 coil pack.

Is the last option to cause a p0173 code. If it's not the MAF, I'll try it  :y
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Re: Omega 2.6 runs better without MAF
« Reply #19 on: 13 June 2019, 11:00:28 »

I had this problem, after looking at maf, it turned out to be the. 135 coil pack.

Is the last option to cause a p0173 code. If it's not the MAF, I'll try it  :y
Look at the live data readings. Not just randomly change parts. The codes are only a small part of the jigsaw in most cases, not the end diagnostic (unless you are a dealer or garage, and thus thick as two short planks)
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Re: Omega 2.6 runs better without MAF
« Reply #20 on: 13 June 2019, 11:59:03 »

I had this problem, after looking at maf, it turned out to be the. 135 coil pack.

Is the last option to cause a p0173 code. If it's not the MAF, I'll try it  :y
Look at the live data readings. Not just randomly change parts. The codes are only a small part of the jigsaw in most cases, not the end diagnostic (unless you are a dealer or garage, and thus thick as two short planks)

You can see values, but if you do not have a sample to compare  at different rpm, load, etc... If you know where those values ​​are, I'd appreciate it if you told me
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Re: Omega 2.6 runs better without MAF
« Reply #21 on: 13 June 2019, 13:06:51 »

I had this problem, after looking at maf, it turned out to be the. 135 coil pack.

Is the last option to cause a p0173 code. If it's not the MAF, I'll try it  :y
Look at the live data readings. Not just randomly change parts. The codes are only a small part of the jigsaw in most cases, not the end diagnostic (unless you are a dealer or garage, and thus thick as two short planks)

You can see values, but if you do not have a sample to compare  at different rpm, load, etc... If you know where those values ​​are, I'd appreciate it if you told me

Long term fuel trims are stored by the ECU over a period of time, so they don't depend on the current engine operating conditions. You can check them with the engine stopped or running and it makes no difference.

Nominally, the long term fuel trims should be zero. They start to depart from zero as the fuel delivery gets less accurate due to engine wear and changes in other items as they age. It's normal for them to wander a few percent from zero in a healthy car. What you're looking for is a value that has shifted more than, say, 10%.

You also need to compare the two banks. If the LTFT for both banks has drifted in the same direction, i.e. they are both at +15%, then the fault is something like the MAF sensor which is common to both banks. If only one has drifted off, or they have gone in different directions, then the diagonsis is very different (e.g. air leak that is affecting just one bank).
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Re: Omega 2.6 runs better without MAF
« Reply #22 on: 13 June 2019, 13:45:59 »

I had this problem, after looking at maf, it turned out to be the. 135 coil pack.

Is the last option to cause a p0173 code. If it's not the MAF, I'll try it  :y
Look at the live data readings. Not just randomly change parts. The codes are only a small part of the jigsaw in most cases, not the end diagnostic (unless you are a dealer or garage, and thus thick as two short planks)

You can see values, but if you do not have a sample to compare  at different rpm, load, etc... If you know where those values ​​are, I'd appreciate it if you told me

Long term fuel trims are stored by the ECU over a period of time, so they don't depend on the current engine operating conditions. You can check them with the engine stopped or running and it makes no difference.

Nominally, the long term fuel trims should be zero. They start to depart from zero as the fuel delivery gets less accurate due to engine wear and changes in other items as they age. It's normal for them to wander a few percent from zero in a healthy car. What you're looking for is a value that has shifted more than, say, 10%.

You also need to compare the two banks. If the LTFT for both banks has drifted in the same direction, i.e. they are both at +15%, then the fault is something like the MAF sensor which is common to both banks. If only one has drifted off, or they have gone in different directions, then the diagonsis is very different (e.g. air leak that is affecting just one bank).

The problem is I have a 3.0 block with 2.6 electronic....  :(
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Re: Omega 2.6 runs better without MAF
« Reply #23 on: 13 June 2019, 17:02:01 »

That doesn't matter. It's the electronics that matters, not the oily bits! You should still get a sane LTFT reading if you use an OBDII code reader because the metered air into the engine should match the fuel required for the correct mixture.
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Re: Omega 2.6 runs better without MAF
« Reply #24 on: 15 June 2019, 14:21:51 »

That doesn't matter. It's the electronics that matters, not the oily bits! You should still get a sane LTFT reading if you use an OBDII code reader because the metered air into the engine should match the fuel required for the correct mixture.

The failure looks like an air intake, but as much as I've reviewed everything, including o-rings to inatke manifold, everything looks good. Is there something that can escape me? Something common that usually fails?
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Re: Omega 2.6 runs better without MAF
« Reply #25 on: 15 June 2019, 14:26:21 »

That doesn't matter. It's the electronics that matters, not the oily bits! You should still get a sane LTFT reading if you use an OBDII code reader because the metered air into the engine should match the fuel required for the correct mixture.

The failure looks like an air intake, but as much as I've reviewed everything, including o-rings to inatke manifold, everything looks good. Is there something that can escape me? Something common that usually fails?
Besides the MAF you mean?  ::)

When was the airfilter changed last? Anything in the intake plumbing... Leaves/rags etc :-\
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Re: Omega 2.6 runs better without MAF
« Reply #26 on: 15 June 2019, 15:13:11 »

That doesn't matter. It's the electronics that matters, not the oily bits! You should still get a sane LTFT reading if you use an OBDII code reader because the metered air into the engine should match the fuel required for the correct mixture.

The failure looks like an air intake, but as much as I've reviewed everything, including o-rings to inatke manifold, everything looks good. Is there something that can escape me? Something common that usually fails?
Besides the MAF you mean?  ::)

When was the airfilter changed last? Anything in the intake plumbing... Leaves/rags etc :-\

The maf can make the banks work differently? The truth is that it's strange for me to go better with the MAF disconnected ...The air filter, spark plugs, oil, etc are new with around 3000 miles
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Re: Omega 2.6 runs better without MAF
« Reply #27 on: 15 June 2019, 15:41:53 »

I'll ask one more time before ignoring this thread.

Post up the live data readings for LTFTs and MAF
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Re: Omega 2.6 runs better without MAF
« Reply #28 on: 15 June 2019, 19:25:19 »



The maf can make the banks work differently? The truth is that it's strange for me to go better with the MAF disconnected ...The air filter, spark plugs, oil, etc are new with around 3000 miles


It's typical, not strange!


Even without the correct procedure of looking at the live data rather than just disconnecting the sensor, a good quality replacement MAF would be a sensible way of fixing the fault.
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Re: Omega 2.6 runs better without MAF
« Reply #29 on: 16 June 2019, 21:41:02 »



The maf can make the banks work differently? The truth is that it's strange for me to go better with the MAF disconnected ...The air filter, spark plugs, oil, etc are new with around 3000 miles


It's typical, not strange!


Even without the correct procedure of looking at the live data rather than just disconnecting the sensor, a good quality replacement MAF would be a sensible way of fixing the fault.

Really? You give me some hope!
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Re: Omega 2.6 runs better without MAF
« Reply #30 on: 16 June 2019, 21:43:39 »

I'll ask one more time before ignoring this thread.

Post up the live data readings for LTFTs and MAF

The LTFT of bank 2 is 25%, bank 1 around 14%. Sorry but I do not remember the values ​​of the MAF. Anyway, I'll try to look at them tomorrow, could you tell me what values  have to give at different rpm or speed?
Also say that the injection times are irregular, typical air intake, but for more than looking I do not see it
« Last Edit: 16 June 2019, 21:46:20 by olm »
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Re: Omega 2.6 runs better without MAF
« Reply #31 on: 17 June 2019, 17:40:17 »

could you tell me what values  have to give at different rpm or speed?
Report the figure at idle, AC off.
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Re: Omega 2.6 runs better without MAF
« Reply #32 on: Today at 10:26:03 »

Well, these are the logs at 120 km/h






In order, LTFT bank 1-2 and STFT 1-2.
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Re: Omega 2.6 runs better without MAF
« Reply #33 on: Today at 17:33:14 »

I wonder why I suggested idle ;). Nothing to do with the fact that we don't know engine load when moving ;)
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Re: Omega 2.6 runs better without MAF
« Reply #34 on: Today at 19:05:09 »

I wonder why I suggested idle ;). Nothing to do with the fact that we don't know engine load when moving ;)

The load have it down on the riht
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Re: Omega 2.6 runs better without MAF
« Reply #35 on: Today at 19:31:21 »

To save TBs bath water... The readings MUST BE TAKEN AT IDLE :y
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Re: Omega 2.6 runs better without MAF
« Reply #36 on: Today at 20:51:26 »

To save TBs bath water... The readings MUST BE TAKEN AT IDLE :y

But at idle the maf can run ok while on hihgway wrong. Nevertheless tomorrow I do readings at idle
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