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[olm]

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

[dave the builder]

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 

[STEMO]

Remove some other bits....you never know. 

[dave the builder]

Remove some other bits....you never know. 

what is your school of thought uncle Stemo 
weight reduction = better fuel economy 

pretty sure GM would not have fitted parts if they where not needed 

[STEMO]

Remove some other bits....you never know. 

what is your school of thought uncle Stemo 
weight reduction = better fuel economy 

pretty sure GM would not have fitted parts if they where not needed 

Remove the air filter......more air.....more oooomph.   Seemples 

[dave the builder]

Remove some other bits....you never know. 

what is your school of thought uncle Stemo 
weight reduction = better fuel economy 

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 

[STEMO]

Remove some other bits....you never know. 

what is your school of thought uncle Stemo 
weight reduction = better fuel economy 

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 

Yes.....euthanasia. You know it makes sense. 

[dave the builder]

Remove some other bits....you never know. 

what is your school of thought uncle Stemo 
weight reduction = better fuel economy 

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 

Yes.....euthanasia. You know it makes sense. 

 
It would save me loads of money off the petrol bill

I'll ask Terry to find me a nice astra 

[olm]

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

[dave the builder]

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

[olm]

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

[dave the builder]

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 ?

[Doctor Gollum]

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

[olm]

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

[olm]

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?