Photo of Vacum lines After removing secondaries 1994 !!

[Dynomite]

Originally Posted by 5ABI VT

Ill snap a photo of the vaccum line. It looks like a spiral like the evap that goes to the plenum but a smaller diameter.

Im just curious about leaving the connection open... would that not tell the ecm that there is no vaccum ? Would it cause the pump to run non stop? Or is all this removed in the chip when programmed to run with no secondaries? I did ask Marc as well if it was as he did do my chip for secondary removal. Im just curious about its function.

Yes....a photo of the spiral vacuum line would be great. You got me thinking of the differences in the LT5 by model year which differences are relatively minor but important for those purchasing components. I am starting a list of those LT5 Component Differences by year with photos.

Differences between LT5 Components by Year

Originally Posted by Paul Workman

**Note: The 90s use a mechanical switch with all the lovely advantages (HA!) of contacts and spring tension and dirt which was replaced by a PCM latch in 91+ cars. IF the POWER switch were to open, and shut the secondaries off on a "secondary-delete" car, a serious lean condition would result, as half of the fuel would be shut off. Soooooo.... I hard-wired the dang thing so that the switch function is bypassed: NO chance of the secondaries being shut off by that switch through accident or mechanical reasons, boy-yo-boy!

I have to include this also as a change from 90' to 91'.

[5ABI VT]

Originally Posted by Dynomite

Yes....a photo of the spiral vacuum line would be great. You got me thinking of the differences in the LT5 by model year which differences are relatively minor but important for those purchasing components. I am starting a list of those LT5 Component Differences by year with photos.

Differences between LT5 Components by Year



I have to include this also as a change from 90' to 91'.

Here's a photo of the spiral line

[Dynomite]

WOW....thanks....and I assume that is a plastic line that fits one end into the rubber "T" near the drivers side Canister vacuum line. The other end I am assuming has a rubber adapter that fits on the line one end and on the nipple of the Differential Pressure Switch?

And it appears the Evap Purge Canister you have on a 94' I assume behind passenger wheel like on 91'........has a coil of plastic tubing under plenum similar to the Differential Pressure Switch coil of plastic tubing. That coil of plastic tubing for Evap Purge connected under front of Plenum Vacuum source. So....for a 94' a BIG mess under Plenum

Originally Posted by 5ABI VT

Here's a photo of the spiral line

[5ABI VT]

Originally Posted by Dynomite

WOW....thanks....and I assume that is a plastic line that fits one end into the rubber "T" near the drivers side Canister vacuum line. The other end I am assuming has a rubber adapter that fits on the line one end and on the nipple of the Differential Pressure Switch?

And it appears the Evap Purge Canister you have on a 94' I assume behind passenger wheel like on 91'........has a coil of plastic tubing under plenum similar to the Differential Pressure Switch coil of plastic tubing. That coil of plastic tubing for Evap Purge connected under front of Plenum Vacuum source. So....for a 94' a BIG mess under Plenum

Exactly! The evap spiral tubing is much thicker I'll put a side by side photo shortly.