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#221 | |
Join Date: Dec 2012
Location: NC
Posts: 1,783
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Where's Cliff here - is there a sequence / write-up for vac test with plenum dry - fit, with all electrical connections? Is it in FSM?
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Don't know the make of the LT1 kit from which it came... I had it mis-routed - post 37 DOES actually show it between 1' and 2' INJ's... |
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#222 | |
![]() ![]() Join Date: Aug 2009
Location: South Dakota/California
Posts: 3,808
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![]() Before you tighten down the Plenum (with Plenum tipped up in front) and ALL vacuum lines, and DIS module connections in place....check your vacuum systems. With all vacuum lines connected, turn key on and listen for vacuum pump to shut off. If it does not shut off, start at the closest vacuum line to the vacuum pump disconnecting the line and holding your finger over the end. If the pump shuts off the leak is on other side of that. Go to next fitting and do the same until you are past the leak wherein the vacuum pump will NOT shut off. You have now located the leak. Also check your HVAC and Cruize Control Vacuum System (check ALL connections). Also check your EVAP Purge system connections (charcoal canister which is under drivers side headlight on your 90'). That single small vacuum port under front of plenum facing rearward (90' only) is for the Evap Purge System. The second larger vacuum port on drivers side lower front of plenum is the main vacuum line for the Charcoal Canister. The second Vacuum port right next to that Charcoal Canister port is your PCV Vacuum port. With the key on, ground the pink wire in the green connector (third from drivers side) on ECM. Use a small finishing nail stuck in alongside the wire connector with an alligator clip pigtail attached to the end for grounding. This will activate the Secondaries which you can watch with the plenum tipped up in front before you bolt it down. This after you are sure you have NO vacuum leaks in the Secondary System. I promised GC I would not mention any modifications .....but you should eliminate TB coolant so you do not have to mess with coolant every time you remove the Plenum......DO NOT TELL GC I suggested this ![]() Vacuum Systems 90' and 91' (Secondary and Cruize/HVAC)
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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; 02-09-2014 at 12:24 PM. |
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#223 |
Join Date: Dec 2012
Location: NC
Posts: 1,783
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Nano-surgery.
There was a tiny bit of the screw sticking out of the front side, but not enough to get Vise-Grips on it. So hello Dremel. I got a grinding bit centered in the backside, so I should be able to get enough bored out without touching the threads. Getting the screw remnants out will be tricky, so I can use the screws that BF sent... Cross yer fingers (and cross yer eyes, teeth, cross yer hair, piggies... ![]() |
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#224 |
Join Date: Dec 2012
Location: NC
Posts: 1,783
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3 hours, 5 Dremel bits ground to nubs.
Then I put on the Dremel cutting wheel, and cut a slot in the remnant on the front. Small screwdriver, and had it out in 5 minutes. ![]() Shaft threads are spared. Shaft is still SNUG in the shaft bore (won't suck air). |
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#225 | |
![]() ![]() Join Date: Aug 2009
Location: South Dakota/California
Posts: 3,808
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![]() I grounded the Secondary switch with a finishing nail along side the connector wire going into the plug without unplugging any of the four connectors ![]() It only took me a few seconds to check the secondaries. Actually I had my buddy watch the secondary canisters through a couple runners of the Plenum each side with my remote wireless camera probe as I grounded the pin. He could tell they were not only operating but operating smoothly each time I grounded the pin on the ECM plug. We could also hear the vacuum pump kick on after a cycle to replenish the vacuum lost in the operation of the canisters as I recall ![]() Anyone can do this inspection/test without removing the Plenum. See Verifying Seocndary Operation with Plenum in Place by Marc Haibeck Last edited by Dynomite; 11-14-2013 at 03:24 AM. |
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#226 |
![]() Join Date: Oct 2004
Posts: 1,884
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The PCM in the image is a '94 - '95 MY only reprogrammable original to the LT1
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#227 |
Join Date: Dec 2012
Location: NC
Posts: 1,783
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Just about ready for a vacuum test...
But a question here (imagine that - I have a question ![]() |
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#228 |
![]() Join Date: Oct 2004
Posts: 1,884
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In your last image in post #334 you show a correct ECM but in your post #331 you've got a PCM from an LT1 in the image - care to explain? I didn't duplicate the images because of the size!
*** Never mind it's got an LT1 engine in the image also!!! Last edited by WVZR-1; 11-14-2013 at 06:31 PM. |
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#229 | ||
Join Date: Dec 2012
Location: NC
Posts: 1,783
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![]() Quote:
![]() ================================================== ============================= But now on vac test - everything plugged in dry, turned the key on, both fuel pump fuses pulled, and the secondary vacuum pump didn't come on. Quote:
Which connector did I miss here? I still have some vac lines un-hooked as well - any of them necessary before sec vac pump trips on? Last edited by Schrade; 04-17-2014 at 09:20 PM. |
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#230 |
![]() Join Date: Feb 2011
Location: San Marcos CA
Posts: 1,786
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the big tube is for the brake booster line and the small one I think feeds the input to the FPR.
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