Vacuum or intake leak

METALPOISON

MEMBER
1995 MAZDA MILLENIA

I seem to have some type of vacuum or intake leak that sounds like it is coming from the firewall. Plugs are burning hot & also can't seem to figure out the hose routing and sensor(?)On the air filter box. Any ideas? 1995 Mazda Millenia 2.5v6.

I recently replaced the engine with a 40,000mi 2.5 that seems to have no issues (actually runs like a sewing machine!). Never could locate the plug for the sensor(?) On the air box or the correct location for the lines that come from it. Now when motor is up to temp it seems to idle erratically. I stopped driving it for fear of the unknown if you will!

Any thoughts on this would be greatly appreciated!

4 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Inspect and test the IACV, EGR valve and test the TPS sensor to include a fuel pressure check

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Wednesday, December 14th, 2011 AT 12:13 AM

JACOBANDNICKOLAS

MECHANIC
109,747 POSTS

Here is a schematic of the vacuum system. It's for the 2.5L. Let me know if it helps.

Joe

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Wednesday, December 14th, 2011 AT 12:14 AM

METALPOISON

MEMBER
2 POSTS

Thanks for the schematic! It was extremely helpful! One of the vacuum valves on the air box is not connected. Also having trouble locating the electrical connector for it. Could this possibly be the problem? I will be setting up a paypal account to give a donation & will definitely share your site with others!

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Thursday, December 15th, 2011 AT 1:14 AM

JACOBANDNICKOLAS

MECHANIC
109,747 POSTS

You are very welcome for the schematic. And, yes, that can be the problem. Let me know if it helps.

If you can donate, great. If you can't, maybe next time. Regardless, your positive feedback is appreciated. Tell as many people as you can.

Take care and if we don't speak before, have a good Christmas.

Joe

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Thursday, December 15th, 2011 AT 2:43 AM