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I have an '87 300zx non-turbo manual trans. I have had it only a week. After about 4 days there seems to be a ton of excess air coming from the engine. It sounds a lot like a massive trailer truck. The noise is consistent. It's there everytime I drive the car. Sometimes it's high-pitched. I've gotten the fuel filter replaced and a full service oil change. I checked under the hood and everything is in good order. Any thoughts? Please!?

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There sounds to be a massive vacuum leak, check all hoses coming off the intake manifold rap your hand around each one to see if the leak gets lower this will help you find it. this is what i think the noise is.

Posted on Jul 10, 2010


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I have a 1989 Toyota Supra Turbo that just started making a high pitch noise. Hard to tell where it's coming from. Almost like a steering pump. Any suggestions? Wish I had more to share and help narrow it...

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You don't state your skills level so I am reluctant to dispense advice that you may not be familar with.

A simple test for airleaks on the inlet / intake system would be to start the car, (parking brake applied and trans in P / N or neutral in a manual trans.) Visually check the intake system for broken clamps, damaged hoses, especially the air hose connected to the turbo. A small leak will produce a very evident "whistle". If the turbo has covered a lot of miles, the compressor wheel and turbine blades may be in contact with the housing, due to worn bearings. Turbos spin in excess of 100,000RPM so it doesnt take much to throw them off, as it were. The wastegate should also be checked for correct operation.

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Look for vacuum leaks. There are tons of hoses, replace dried and cracked ones....

The trans shift issue that you describe seems that the trans is being told to hold back the shift, there is a unit at the end of the vacuum tube, AT the trans, called a modulator. They have a rubber diaphram inside that fails and then trans fluid gets sucked into the engine, via this vac. hose. Pull it off and see if any trans fluid comes out...Should be ZERO.

Also, your vehicle must have regular trans service, especially you must change the FILTER. Disk material eventually clogs the filter, then trans fails really fast.

You may consider having a quick lube shop do the trans service, they use a machine that pumps new fluid in while unit is running, totally flushing converter, cooler,and lines...but DO replace the filter.

To be fair, the service suggestion has nothing to do with yoru complaint, necessarily...

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