Thread: Fuel question
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JFairman JFairman is offline
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,274
"Can the metering plate be adjusted somehow?"
Yes it can and according to Larry Fletcher at CISFLOWTECH most of the CIS airflow sensor plates he's seen on older cars need adjusting and most people don't know it.

With the fuel pumps running so control pressure is pushing the plate up all the way while the motor is off the sensor plate should be right even with the narrowest point of the venturi cone, and it has to be perfectly centered.
You check for it being centered all the way around it with a feeler gauge.

To change the sensor plate hight at rest while fuel pumps are running there is a small interference fit pin under the fuel line inlet on the airflow meter housing. You have to remove the fuel line to get at it but you can see it by looking at the left side of the fuel line inlet on the fuel head.

If the plate is too high, take a small drift punch and hammer and tap it downwards slowly and carefully to lower it. If the plate is too low or you drive it downwards too far then it becomes alot of work....
You then have to remove the whole CIS airflow meter housing that is held in by only 3 nuts and bolts and then split the thing top from bottom. you will need a new gasket when reassembling.

Once apart, you drive that pin upwards or outwards from the housing. Then put it all back together and with the motor off and pumps running so control pressure is pushing the plate upwards you tap the pin downwards until it is even with the narrowest point of the venturi cone.
If that narrowest point of the venturi is not a point and is a small flat area about 1mm long, the plate should be even with the top of it.

hth.
Old 08-17-2010, 03:09 PM
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