2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

88 TII Vacuum Line Routing Questions

Old Nov 4, 2019 | 06:04 AM
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88 TII Vacuum Line Routing Questions

Looking for some advice on a vacuum line on an 88 TII. The car is a 10AE. Every diagram that I have seen online is either for an 87 or an 89. Perhaps someone has an 88 apart or has pictures of one here that's not been modified that can help me straighten this issue out. My other all original 10AE is of no help as I can only see that the vacuum line runs under him. But I'm not pulling the car apart to look for a vacuum line as it runs perfect and has never been apart.

On the lower intake manifold is the nipple in the first picture supposed to be capped originally?

Next, there is a capped vacuum line on the hard lines above the EGR valve. It's a hard line that connects to a vacuum line. Wanting to make sure the rubber vacuum line that it connects to runs to the metal vacuum port under the primary fuel rail. The vacuum port points upward almost directly under the primary rail. The third and fourth pictures are of where I believe the line runs. Thank you in advance for any help anyone is able to provide!


88 TII Vacuum Line Routing Questions-2e2dqom.jpg

88 TII Vacuum Line Routing Questions-lzhettx.jpg

88 TII Vacuum Line Routing Questions-m8ucqnk.jpg

88 TII Vacuum Line Routing Questions-9gw2cyu.jpg
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Old Nov 4, 2019 | 05:09 PM
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This is from the 88 FSM Looks like the first one goes to the Pressure Regulator Solenoid, and the second one (between the primaries) goes to the back of the UIM, where the 3 ports are. The second one down.


Last edited by FührerTüner; Nov 4, 2019 at 05:22 PM.
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Old Nov 5, 2019 | 05:45 AM
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I have the same picture and that picture does not show the capped line that runs under the upper intake manifold. I'll get a better picture of that line this morning.
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Old Nov 8, 2019 | 06:02 AM
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Here are pictures of the capped vacuum line and a visual of the hard lines in question for reference. These pics are on my other 10AE that runs and drives great.

88 TII Vacuum Line Routing Questions-p3oilmc.jpg

88 TII Vacuum Line Routing Questions-ueswheh.jpg
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Old Nov 8, 2019 | 07:12 AM
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Last edited by FührerTüner; Nov 8, 2019 at 07:15 AM.
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Old Nov 9, 2019 | 05:41 AM
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Thank you! In the picture it appears to me that it just shows the capped end and not the other end of where that goes. Am I missing something there?
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Old Nov 9, 2019 | 09:23 AM
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It looks like it goes from the egr to the egr solenoid.
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Old Nov 11, 2019 | 09:58 AM
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i always end up popping the vacuum hose off at the solenoid and the valve in question, that way there is no guessing.
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Old Nov 12, 2019 | 05:51 AM
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So you also agree that the capped line goes to the egr solenoid?
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Old Nov 12, 2019 | 05:53 AM
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Looking at the diagram, I thought originally that the yellow connector that went to the solenoid on the filler neck was the twin scroll solenoid. Apparently I've been wrong in that it is actually the egr solenoid. Learn something new every day.
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Old Nov 25, 2019 | 05:44 AM
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I will attempt to finish this up this week and keep everyone posted.
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