Question about 1997 Chevrolet Astro

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My 1997 astrovans A/C flaps aren't working. I figured it was a vacuum problem but i cant seem to find where the connection is on the intake manifold (so i can connect the small hose on the T fitting) anyone wanna shed some light on my situation?

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Connection is on the intake manifold on the drivers side about halfway back.Look for broken small plastic tubing and follow it back to the connection.Replace with small size RUBBER tubing all the way out from the engine vacuum source.

Posted on Aug 11, 2009


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How to remove intake manifold for 1997 pontiac grand prix

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The diesel versions are apt to become clogged throughout the egr valve and ports and the intake becomes very oily but a clean should only be needed about every year. This is not typical of the petrol engines.

The oil must be coming from somewhere and there must be quite a lot of it being turned into carbon/sludge in order to be blocking the egr valve so often and that might be at least part of the trouble. There is probably just as much oily carbon going down the exhaust so eventually the CAT will become so blocked it will increasingly rob the engine of power.

The butterfly valves in the intake manifold are part of a design that varies the length of the intake tract in order to increase volumetric efficiency over a wider engine speed range. The engine management decides when to switch the vacuum supply on. Fault diagnosis can be a rather involved and protracted procedure depending which engine is fitted.

I suggest the source of the oil should be investigated and recified if possible before you change the manifold, though removing the manifold could be part of the process of diagnosis. It could be leaking valve stem oil seals or a leaky turbo if fitted, or something more serious. The manifold probably doesn't need replacing and I think it producing more power after you fiddled with it is coincidence...

First put right what you see and what you know and then worry about the other stuff.

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My 1997 jeep grand cherokee dies. it will start right back up but i cant figure out what it is. its not an oil pressure thing an over heating thing or a charge thing . i cant figure it out. i suspect its a...

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Could also be fuel related i.e. filter and/or weak/bad pump.

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There is a vacuum line that goes from the bottom of the map sensor on a 1997 potiac grand prix. What does it go to.

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The major causes of backfires are:

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It depends on the type of injection system your Astro has. If it has a Throttle body injection system, the injector is in the assembly on top of the engine on the intake manifold. If it has multi-point injection, it should have multiple injectors connected to the fuel rails on the manifold.

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