Under plenum pics of a '90 just for reference - Page 2 - ZR-1 Net Registry Forums

A26B · 12-06-2008

Quote:

Originally Posted by Dandy97

The first time I removed the plenum I found mine were like the ones shown. This is supposedly flipped. I flipped mine around and checked them with a vacuum pump and they no longer actuated properly. I reinstalled them incorrectly and they tested out fine, so I left them. I think if they have been backwards for a long time they should be just left alone.

I had the same experience and also believe they should be left as-is and not flipped around.

WydGlydJim · 12-06-2008

When I checked mine, I did notice there was some very minor binding while operating, so I made that better by actually bending the bracket a little........interesting subject; once again the knowledge here is awesome. If and when I go back down under, I may change to new ones.......question is still out there...availability?

tomtom72 · 12-07-2008

The old P/N used to be 1996743. I get that from my parts CD that I got from Limey when (4+yrs ago) I just bought my Z. I ran the number at GMPartsDirect, P & G, Samuels Chevy and come up with "no parts found".

Now there was a time when even if you plugged in and out of date P/N, you would get the new P/N. Soooo, I can't say if the actuators are NLA, or if the old P/N is superceeded and the system doesn't give the newer P/N...sorry!

The only thing I could think to do would be to call Tom Henry Chevy????

Tom

A26B · 12-07-2008

When they were last available, the quality control was very poor. About 75% were defective, so be cautious & vacuum check operation before buying...... if you find any.

With all the secondary removal mods going on, there may be good used ones about.

12-06-2008	#12
WydGlydJim Join Date: Jan 2008 Location: Wichita, Ks. Posts: 318	Re: Under plenum pics of a '90 just for reference When I checked mine, I did notice there was some very minor binding while operating, so I made that better by actually bending the bracket a little........interesting subject; once again the knowledge here is awesome. If and when I go back down under, I may change to new ones.......question is still out there...availability? __________________ 2009 LS9 1990 LT-5/sold/Bought my Baby back 1994 Lingenfelter LT-5/sold 1973 LS4/sold

12-07-2008	#13
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,609	Re: Under plenum pics of a '90 just for reference The old P/N used to be 1996743. I get that from my parts CD that I got from Limey when (4+yrs ago) I just bought my Z. I ran the number at GMPartsDirect, P & G, Samuels Chevy and come up with "no parts found". Now there was a time when even if you plugged in and out of date P/N, you would get the new P/N. Soooo, I can't say if the actuators are NLA, or if the old P/N is superceeded and the system doesn't give the newer P/N...sorry! The only thing I could think to do would be to call Tom Henry Chevy???? Tom __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member

12-07-2008	#14
A26B Join Date: Dec 2003 Location: Arcadia, OK Posts: 3,401	Re: Under plenum pics of a '90 just for reference When they were last available, the quality control was very poor. About 75% were defective, so be cautious & vacuum check operation before buying...... if you find any. With all the secondary removal mods going on, there may be good used ones about. __________________ Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 *ZR-1*, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed.