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Q: Why there should Need of high vacuum during emission?
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Need a cacuum emissions diagram hose routing for a 1978 Chevy nova 350 4 barrel?

There should be a sticker located in the engine compartment that shows the emission related vacuum line routing.


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Vehicles made in the USA have a diagram on a small sticker under the hood, in the engine compartment, that shows emission vacuum line routing.


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There should be a sticker somewhere under the hood showing a diagram of all the vacuum lines and where they go.


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Why is the service engine soon light on in your 2001 suburban?

There is a problem in the emission system, You need to have engine scaned with a engine scanner to find the problem. It could just be a loose gas cap, vacuum leak under the hood.


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You need a vacuum gage, hook it to a vacuum port that has constant vacuum. It should have about 19 to 25 inches of vacuum at idle for a stock engine if the timing is set correctly. Now quickly snap the throttle wide open the gage should drop to about 5 then back to where it was. You can also set the timing by adjusting the distributor so you get highest vacuum reading.