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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1 Answer

How to remove intake manifold for 1997 pontiac grand prix


You have to remove anything that is connected and in the way of the intake. Remove the fuel rail, the EGR valve and supply pipe from the manifold, the map sensor, the vacuum for the fuel pressure regulator, the alternator and support bracket, the water pipes for the throttle body, and the bolts that hold it down.

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Look for an air leak between the AFM and the intake manifold.
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Vauxhall zafira inlet manifold change


You don't say whether it is petrol or diesel and whether it is a turbo model and what sort of age it is.
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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1 Answer

I have a 97 buick lesabre with six cyl. It surges at stops then crawls. The mechanic cant figure it out. Any ideas? Thanks


Mechanic has probably already checked, but a vacuum gauge connected to manifold vacuum should show if there is a vacuum or air leak from the intake manifold.

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1 Answer

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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...


The age of your vehicle also guarantee's a vacuum leak. It may sound silly but the truth is rubber grommets, and hose's shrink and dry out over time and the harsh environment under the hood makes it worse. Check all vacuum lines and fittings attached to the intake manifold, valve covers (pcv valve), and be sure to check for a vacuum fitting on top of the intake just behind the throttle body. Does it fit tight in the hole? You can seal loose fittings with a high-temp RTV (Red) silicone sealant/adhesive. Several small leaks add up and your engine, heat/AC, and transmission will be all to glad to tell you about it.

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

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1 Answer

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.


The vacuum line goes from the Manifold Absolute Pressure sensor directly to the Intake Manifold.

Somewhere on the intake manifold there should be a place to connect it.

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2 Answers

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The major causes of backfires are:

1) Emission control system not fuctioning properly.
2) Ignition timing is incorrect.
3) Faulty secondary ignition system; cracked spark plug insulator, faulty plug wires, distributor cap and/or rotor.
4)Fuel injection system malfunction.
5) Vacuum leak at fuel injectors, intake manifold or vacuum hose.
6) EGR stuck open all the time.

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1 Answer

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there is a flap in the dash that opens and closes with a vacuum suction at the flip of your switch there is a 1 way suction valve in your vacuum lines that controls this flap first check your vacuum lines for a break or tear then locate this valve usually located towards the back of the engine on top of the intake manifold within the vacuum lines also chk it and make sure that its intact im sure this will put u in the ball park

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1 Answer

Help


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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