Secondaries not functioning - Page 2 - ZR-1 Net Registry Forums

Paul Workman · 10-10-2019

AND....Im sure you realize by now that it will run on secondaries FULL TIME. Many of us run on FULL ENGINE POWER, 100% of the time (above 1(?)% throttle input, IIRC). If you can pardon an old shade tree mechanics logic: "Parts that don't exist don't break, and they don't cost much!"

Dynomite · 10-10-2019

One of the reasons I have a ZR-1/LT5 is the LT5. An amazing engine which I found out once you treat it with a bit of respect in a restoration/maintenance it never quits (runs forever)

I replaced the complete secondary vacuum system on the LT5s for less than $100 (all those old rubber connectors are usually the issue as well as those old original injectors).

Lets not forget the old Fuel Pressure Regulators also replaced by Phil's new Fuel Pressure Regulator that can be changed out after initial installation without removing the Plenum (the original Fuel Pressure Regulators usually are a bit rusty inside)

I would never eliminate a functional Secondary Fueling System which is the most unique features of an LT5 (The Full Power Key and all that Dual Fueling associated with the Full Power Key).

TexasZR1 · 10-14-2019

Tightened everything up, new solenoid installed (in old frame), new gaskets, topped off coolant, runs like a dream! In my case, someone had already put stiffeners in the accordian.

10-10-2019	#11
Paul Workman Join Date: Nov 2007 Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri Posts: 6,493	Re: Secondaries not functioning AND....Im sure you realize by now that it will run on secondaries FULL TIME. Many of us run on FULL ENGINE POWER, 100% of the time (above 1(?)% throttle input, IIRC). If you can pardon an old shade tree mechanics logic: "Parts that don't exist don't break, and they don't cost much!" __________________ Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry

10-10-2019	#12
Dynomite Join Date: Aug 2009 Location: South Dakota/California Posts: 3,797	Re: Secondaries not functioning One of the reasons I have a ZR-1/LT5 is the LT5. An amazing engine which I found out once you treat it with a bit of respect in a restoration/maintenance it never quits (runs forever) I replaced the complete secondary vacuum system on the LT5s for less than $100 (all those old rubber connectors are usually the issue as well as those old original injectors). Lets not forget the old Fuel Pressure Regulators also replaced by Phil's new Fuel Pressure Regulator that can be changed out after initial installation without removing the Plenum (the original Fuel Pressure Regulators usually are a bit rusty inside) I would never eliminate a functional Secondary Fueling System which is the most unique features of an LT5 (The Full Power Key and all that Dual Fueling associated with the Full Power Key). __________________ 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; 10-10-2019 at 09:50 AM.

10-14-2019	#13
TexasZR1 Join Date: Oct 2018 Location: Houston Texas Posts: 40	Re: Secondaries not functioning Tightened everything up, new solenoid installed (in old frame), new gaskets, topped off coolant, runs like a dream! In my case, someone had already put stiffeners in the accordian. __________________ 1990 ZR1 #2184 BLK/BLK. Essentially stock. Plug-in Skip Shift Eliminator.