Thread: Do i need a new MAF?

Chazza , as long as the numbers match its all good .
George

New maf arrived ,installed .Run perfect for half an hour and back to where it was.Engine is running hotter than before too ,so much so that the gas thingy on the front was too hot to touch .Is the engine running lean ? Thats my best guess ,if so whats the max voltage i can adjust the maf ? It came with 2.56v preset. The voltage i set it to is 1.35v as recommended by a member and tried by many with succes .

Before you make assumptions about lean/rich mixtures, you should check the actual mixtures. A simple thing is to install an O2 sensor into the exhaust and read it with a digital volt meter. You can then tell if the mixture is either side of spot on, and adjust accordingly. Jaycar do a little LED kit for reading the sensor too. A 3 wire heated sensor off a Falcon does well for this, 12V and earth to the heater wires, and a 0-1 volt (lean-rich) output for the reader.

Edit: also, have you checked the temp sender for the ECU yet? It's critical to fuelling, it lives behind the thermostat housing, has a 2 wire plug that looks like an injector plug, and should read around 300 ohms when hot. Open circuit means VERY rich when warm.

Thanks Bee Utey , i believe i got the oxygen sensors factory fitted.I set it back to the preset 2.56v, its no longer have a stinging petrol smell at the exhaust .What voltage the oxygen sensor should read ?

The distributor vacuum advance diaphragm on the D1 V8 is a common issue which results in high fuel consumption. worth getting checked out. My old man had a D1 V8 that drank petrol. Consumption improved by 4-5mpg after the distributor was repaired.

-375 ohm , thats the only reading i can get no matter which way i swap the anodes. Thanks mate ,the vacuum advance is working .
George

Getting a little closer to the problem .....

Originally Posted by manchild21000

Thanks Bee Utey , i believe i got the oxygen sensors factory fitted.I set it back to the preset 2.56v, its no longer have a stinging petrol smell at the exhaust .What voltage the oxygen sensor should read ?

The tutorial that your reading is mainly for early 14cux / non oxy sensor systems ....


...... Over-fuelling can kill Oxy sensors .... They may need cleaning / replacing...Check if they are working (you have 1 sensor from memory)

Cheers
Mike

Originally Posted by manchild21000

-375 ohm

5000 ohm's when dead cold
300 - 400 ohm's when at temperature