01-27-2017 | #51 |
Join Date: Mar 2014
Location: Warrington PA
Posts: 1,913
|
Re: WAZOO Day Success 1/21/17
That's why Yun and Jim use the "famous" block of wood to keep the front of the plenum raised to make sure everything remains in place....but valid points made....again appreciated....
Sent from my SM-G935P using ZR-1 Net Registry mobile app
__________________
Tom 1994 ZR-1 #009 "captured test fleet car" 1974 LS4 454 Vert 1982 L83 CFI...now a retired "dd"....Sold WAZOO Member |
01-28-2017 | #52 | |
Join Date: Mar 2014
Location: Warrington PA
Posts: 1,913
|
Re: WAZOO Day Success 1/21/17
Quote:
And off I went. Engine is very responsive and idle was somewhat under control. Most of the time it was under 1000 r's when stopped. Although there times when it was a 1000 r's or slightly higher, it did seem to fluctuate slightly. I did notice that the IAC did register "0" at any idle speed whether higher or lower after driving for a few miles. As soon as I would come off idle the IAC would go higher. TPS was now reading @ .54v and would come down to .52v and back to .54v when stopped and idling. So I imagine that although the throttle cable seem fine, it may be possible that there some slight play because of the idle difference as opposed to a vacuum leak. I will have to check out the throttle body blades further. On a side note, I did a hot restart before going in the garage and I got the alternator fan blade noise back again. And I thought I corrected that yesterday, oh well!!! Either going to change the fan blade if I can with the alternator in place or just changing out the alternator. If it ends up coming out, that unit is not going back in!!!!
__________________
Tom 1994 ZR-1 #009 "captured test fleet car" 1974 LS4 454 Vert 1982 L83 CFI...now a retired "dd"....Sold WAZOO Member |
|
01-29-2017 | #53 |
Join Date: Apr 2013
Location: Eastern Missouri
Posts: 773
|
Re: WAZOO Day Success 1/21/17
Sounds to me like the bearings are bad in the alternator. Not sure how the blades could just bend themselves?
__________________
[LEFT][SIGPIC][/SIGPIC][/LEFT] [CENTER][COLOR=Indigo][SIZE=4][I][B] **Now Sold** 1990 ZR-1 #2093, Black on Black..[/B][/I][/SIZE][/COLOR][/CENTER] |
01-29-2017 | #54 |
Join Date: Aug 2006
Location: McLean, VA
Posts: 3,713
|
Re: WAZOO Day Success 1/21/17
Something strange is going on... Never had any issue with fan blade hitting alternator housing. Maybe spacer/washer was installed incorrect when it was rebuilt?
There should be 1/8" clearance from the fan blade edge to the housing. Tom, If you have a good elect. impact wrench, with a universal and extension, you can break the nut loose with the alternator on the car. Also, take the nut off your old, dead alternator and take a mental note of sequence and look where the spacers/washers are. See if the alternator on the car has same stacking. Last edited by secondchance; 01-29-2017 at 10:17 AM. |
01-29-2017 | #55 | ||
Join Date: Mar 2014
Location: Warrington PA
Posts: 1,913
|
Re: WAZOO Day Success 1/21/17
Quote:
When I take the tension off the belt, I can then rotate the alternator pulley in either direction. Not only can you see, but also feel where parts of the fan blade actually scrape against the housing. After numerous attempts to correct this I thought it was a done deal. But after yesterday's ride, I was proven wrong. And when the blades were pried or bent by me, and not rubbing, alternator was quiet as could be. Don't think the blades just bent themselves, rather the housing is slightly wrapped, or the blades are, or as Yun mentioned below, maybe the spacer/washer was installed incorrect. Of course the fan blade is now toast and will probably get hung up on the garage wall. Quote:
Other than that, the LT5 runs fantastic........
__________________
Tom 1994 ZR-1 #009 "captured test fleet car" 1974 LS4 454 Vert 1982 L83 CFI...now a retired "dd"....Sold WAZOO Member |
||
01-29-2017 | #56 |
Join Date: Mar 2014
Location: Warrington PA
Posts: 1,913
|
Re: WAZOO Day Success 1/21/17
Doing some research on the idle, butterflies opening and closing, and WOT adjustment. And learning as I go along...
Used the Tech 1 with engine off and key on, TPS setting with throttle closed is.. .52v @ 0% with WOT TPS 4.54v @ 100% So since I am opening @ 100% with WOT the throttle cable is operating correctly. The only thing I don't understand is if I let my foot off the accelerator normally, the TPS is @ .54v if I let my foot off quickly TPS is @ .52v Could that difference between .54v & .52v be the reason for my idle having a slight fluctuation as described earlier? Or is the difference between the two readings so minor, that it would not have any affect on the idle at all? thanks for any info....... on a side note, my electric impact is not strong enough to undo any pulley nut on any alternator, just doesn't have the power.....lol looks like the alternator removal job starts tomorrow......
__________________
Tom 1994 ZR-1 #009 "captured test fleet car" 1974 LS4 454 Vert 1982 L83 CFI...now a retired "dd"....Sold WAZOO Member Last edited by Roadster; 01-29-2017 at 10:00 PM. |
01-29-2017 | #57 | |
Join Date: Dec 2012
Location: Tampa, FL
Posts: 118
|
Re: WAZOO Day Success 1/21/17
Quote:
|
|
01-29-2017 | #58 | |
Join Date: Mar 2014
Location: Warrington PA
Posts: 1,913
|
Re: WAZOO Day Success 1/21/17
Quote:
That was my intention, doing a light rebuild which was very successful, but things happen and this is one of them.
__________________
Tom 1994 ZR-1 #009 "captured test fleet car" 1974 LS4 454 Vert 1982 L83 CFI...now a retired "dd"....Sold WAZOO Member |
|
01-30-2017 | #59 |
Join Date: Aug 2012
Location: Ellicott City, MD
Posts: 1,678
|
Re: WAZOO Day Success 1/21/17
Tom, last year when I had my car at the.... (ugh I know, I know,...Chev dealer) I had the same problem. When I took my car to Dempsey to undue all the screw-ups from the dealer he found out why the alternator fan was hitting.....the alternator was missing a bolt! Just make sure they are all there and one did not work itself out. Keep us posted.
__________________
Charlie __________ Dredgeguy WAZOO Member 1992 Bright Red/Black ZR1 #246 Dana 4:10 gears Polished LT5 by Haibeck Polished Fikse FM5's with Michelin Pilot Sport 2 Stainless Works headers and cats with Corsa |
01-30-2017 | #60 | |
Join Date: Aug 2009
Location: South Dakota/California
Posts: 3,794
|
Re: WAZOO Day Success 1/21/17
Quote:
All Aluminum Alternator Pulley
__________________
Left Clickable links -Solutions- LT5 Modifications/Rebuild Tricks Low Mileage ZR-1 Restoration 1990 Corvette (L98) Modifications LT5 Eliminated Systems LT5 Added Systems LT5/ZR-1 Fluids 1995 LT5 SPECIFIC TOP END REBUILD TRICKS Last edited by Dynomite; 01-30-2017 at 07:42 PM. |
|
|
|