Question about 1992 Volkswagen Jetta

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92 Jetta I am experimenting with magnet gas saver device on my 92 Jetta. I think I am getting at least 3 maybe 5 MPG better milelage. I saw a guy on You tube experimenting with Hydrogen assist in his VW and showed that he adjusted the air mass sensor to compensate for better fuel burn. He explained that if the air mass sensor is not adjusted the computer will just put fuel into the engine, so he did something to the airmass sensor to lower the air mass reading. Can you please tell me how to adjust the air mass sensor so the computer will send less fuel to the engine? I thank you kindly.

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  • dpelly Jul 29, 2008

    I am experimenting with magnets to increase my gas mileage on my 92 Jetta. So far I increased from about 29.5 mpg to about 35 mpg. I understand
    that the computer compensates and pumps more gas into the engine to counter act fuel saving devices. Is this correct? Can I manually adjust the air mass sensor, or some other thing to lean the fuel amount and if so how?

  • dpelly Jul 29, 2008

    Hi,

    I am not great with computers and I cannot open the zip file you sent.

    I have an old IMac and use pdf I think. I have stuffit expander. Can you please send the file in some form I can use.

    Thank you kindly
    David Pelly


  • dpelly Jul 29, 2008

    So I could see the entire sensor, I have removed the plastic housing that was attached to the airflow mass sensor.
    By the way; The mass sensor was replaced with a used one, prior to my purchase of the vehicle, as it has written on it with a paint marker that the sensor was of a 90 jetta. The sensor is a Bosch.

    The only tamper proof metal plug i could see was on the engine side of the sensor far from the gates. I removed it as you instructed with a drill. All I could see there is the side view of the bottom end of some kind of bolt. No adjustment capabilities.

    As far as I could tell, the top end of this bolt was under part of the aluminum casting. No plug. But the aluminum housing there, had an circular sunken imprint in the mould which appears to cover the top end of this bolt. I drilled that out also. I drilled through about
    a good 1/4 inch of aluminum and hit steel. But because the drill bit is tapered I can only see through about a 1/8 hole, then I see a flat steel surface. But all this is far from the sensor gates, at the far end of the entire sensor housing, where the engine breather hose attaches. So something does not add up here. Help?


  • dpelly Jul 31, 2008

    The instructions that you gave me do not appear to apply. Please read my last post.

    Thanks,

    David Pelly

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U cud take test drives and make adjustments..

thanks for using Fixya

Posted on Jul 29, 2008

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Dear sir/madam,

1.CO reading must fall within band on checking tolerance graph.
2.If CO reading does not fall within the tolerance band, proceed with adjustment.
3. Remove the tamper-proof plug from the CO adjustment screw location on air flow sensor by drilling into plug with a:
0.098 in .(2.5mm) drill bit.

4. Thread a sheet metal screw into the drilled hole using a:
0.137 in .(3 mm) sheet metal screw

5. Pull out the screw (with plug attached) using pliers.

6. Adjust the CO as necessary by adjusting the CO adjustment screw in the air flow sensors with a :

5 mm hex wrench


Thanks
Good luck


Don't forget to rate the solution


Posted on Jul 29, 2008

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Here is the adjusting procedure

Posted on Jul 29, 2008

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You need to set the sir mass flow though the computer
or by a new one at a lower mbs its a after market one

Posted on Jul 29, 2008

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