Author Topic: Heavier throttle (mostly) issues  (Read 1098 times)

Offline MP81

  • Carb lover
  • ***
  • Posts: 66
Re: Heavier throttle (mostly) issues
« Reply #15 on: September 06, 2019, 06:39:34 AM »
Sweet - sounds like stuff I can pick up at Home Depot as needed. I might actually have a couple set screws, somewhere...
-1981 Camaro Z28 - 305 ci LG4 V8 - Headers, Dual Exhaust, GW U/LCAs, Hotchkis Springs/Swaybars, DD HDX Cluster
-2007 Cobalt LT - 2.2L L61 I4 - M62 SC, FE5 Suspension, Much More
-2014 Cruze Diesel - 2.0L LUZ I4 Turbodiesel - MSR Wheels, UR Rear Bar
-2017 Volt LT - Voltec Gen 2 + 1.5L I4

Offline MP81

  • Carb lover
  • ***
  • Posts: 66
Re: Heavier throttle (mostly) issues
« Reply #16 on: September 09, 2019, 07:01:08 PM »
Hopefully you don't mind, but I'm going to document my progress here - in the event that I have an issue, or perhaps in case someone spots something I didn't!

Before removing the carb:






Carb removed - the inside of the intake looks pretty clean

-1981 Camaro Z28 - 305 ci LG4 V8 - Headers, Dual Exhaust, GW U/LCAs, Hotchkis Springs/Swaybars, DD HDX Cluster
-2007 Cobalt LT - 2.2L L61 I4 - M62 SC, FE5 Suspension, Much More
-2014 Cruze Diesel - 2.0L LUZ I4 Turbodiesel - MSR Wheels, UR Rear Bar
-2017 Volt LT - Voltec Gen 2 + 1.5L I4

Offline MP81

  • Carb lover
  • ***
  • Posts: 66
Re: Heavier throttle (mostly) issues
« Reply #17 on: September 09, 2019, 07:02:37 PM »
Carb off the car:





Fuel filter looks a tad dirty...


After a quick spray/wipe off with carb and brake cleaner - quite a lot cleaner (especially for doing this outside while being eaten alive by mosquitoes)! Time to let this dry overnight...

-1981 Camaro Z28 - 305 ci LG4 V8 - Headers, Dual Exhaust, GW U/LCAs, Hotchkis Springs/Swaybars, DD HDX Cluster
-2007 Cobalt LT - 2.2L L61 I4 - M62 SC, FE5 Suspension, Much More
-2014 Cruze Diesel - 2.0L LUZ I4 Turbodiesel - MSR Wheels, UR Rear Bar
-2017 Volt LT - Voltec Gen 2 + 1.5L I4

Offline Cliff Ruggles

  • Global Moderator
  • Qjet Hero
  • *****
  • Posts: 4119
Re: Heavier throttle (mostly) issues
« Reply #18 on: September 10, 2019, 05:22:51 AM »
Looks like it's had some work done to it.  The primary throttle shaft screws have been out at some point, hopefully it got bushings during that evolution......Cliff

Offline MP81

  • Carb lover
  • ***
  • Posts: 66
Re: Heavier throttle (mostly) issues
« Reply #19 on: September 10, 2019, 06:29:03 AM »
It must have. Someone was saying a plug up top wasn't there that should be if it was never rebuilt.

How can you tell on the screws? Would be great if the bushings were done so I don't have to...
-1981 Camaro Z28 - 305 ci LG4 V8 - Headers, Dual Exhaust, GW U/LCAs, Hotchkis Springs/Swaybars, DD HDX Cluster
-2007 Cobalt LT - 2.2L L61 I4 - M62 SC, FE5 Suspension, Much More
-2014 Cruze Diesel - 2.0L LUZ I4 Turbodiesel - MSR Wheels, UR Rear Bar
-2017 Volt LT - Voltec Gen 2 + 1.5L I4

Offline MP81

  • Carb lover
  • ***
  • Posts: 66
Re: Heavier throttle (mostly) issues
« Reply #20 on: September 10, 2019, 08:10:30 AM »
Also, I forgot to mention, all four bolts were not even finger tight.  ;D
-1981 Camaro Z28 - 305 ci LG4 V8 - Headers, Dual Exhaust, GW U/LCAs, Hotchkis Springs/Swaybars, DD HDX Cluster
-2007 Cobalt LT - 2.2L L61 I4 - M62 SC, FE5 Suspension, Much More
-2014 Cruze Diesel - 2.0L LUZ I4 Turbodiesel - MSR Wheels, UR Rear Bar
-2017 Volt LT - Voltec Gen 2 + 1.5L I4

Offline MP81

  • Carb lover
  • ***
  • Posts: 66
Re: Heavier throttle (mostly) issues
« Reply #21 on: September 10, 2019, 05:49:51 PM »
Started disassembly:



Air horn removed:



Main casting with the air horn removed:



Gasket removed:



Accelerator pump - seal does look mostly okay, I think:



Main casting components removed:



-1981 Camaro Z28 - 305 ci LG4 V8 - Headers, Dual Exhaust, GW U/LCAs, Hotchkis Springs/Swaybars, DD HDX Cluster
-2007 Cobalt LT - 2.2L L61 I4 - M62 SC, FE5 Suspension, Much More
-2014 Cruze Diesel - 2.0L LUZ I4 Turbodiesel - MSR Wheels, UR Rear Bar
-2017 Volt LT - Voltec Gen 2 + 1.5L I4

Offline MP81

  • Carb lover
  • ***
  • Posts: 66
Re: Heavier throttle (mostly) issues
« Reply #22 on: September 10, 2019, 05:50:31 PM »
Well, looks like the plugs were removed down here:



Throttle plate removed:



Fuel bowl plugs have already been epoxied in the past:



Throttle plate gasket removed:



I need to do a quick soapy water test and see if the bowl plugs are leaking or not, but the epoxy looks to be pretty solidly on there, so we'll see. Everything is really quite clean inside. Nothing seems gummed up - everything moves quite easily and freely.
-1981 Camaro Z28 - 305 ci LG4 V8 - Headers, Dual Exhaust, GW U/LCAs, Hotchkis Springs/Swaybars, DD HDX Cluster
-2007 Cobalt LT - 2.2L L61 I4 - M62 SC, FE5 Suspension, Much More
-2014 Cruze Diesel - 2.0L LUZ I4 Turbodiesel - MSR Wheels, UR Rear Bar
-2017 Volt LT - Voltec Gen 2 + 1.5L I4

Offline MP81

  • Carb lover
  • ***
  • Posts: 66
Re: Heavier throttle (mostly) issues
« Reply #23 on: September 10, 2019, 06:14:03 PM »
Some other detail pictures:

The first one: some plunger on the underside of the air horn?
The second one: The accelerator pump seems awfully springy and wanting to pop out of the casting - this normal?
-1981 Camaro Z28 - 305 ci LG4 V8 - Headers, Dual Exhaust, GW U/LCAs, Hotchkis Springs/Swaybars, DD HDX Cluster
-2007 Cobalt LT - 2.2L L61 I4 - M62 SC, FE5 Suspension, Much More
-2014 Cruze Diesel - 2.0L LUZ I4 Turbodiesel - MSR Wheels, UR Rear Bar
-2017 Volt LT - Voltec Gen 2 + 1.5L I4

Offline MP81

  • Carb lover
  • ***
  • Posts: 66
Re: Heavier throttle (mostly) issues
« Reply #24 on: September 10, 2019, 06:16:03 PM »
First one: Power piston?
Second one: So I took this out, and it looks like the rebuild kit has a similar part, but with some kind of plunger in there? Mine does not have that. It also doesn't have the slots like mine does.
-1981 Camaro Z28 - 305 ci LG4 V8 - Headers, Dual Exhaust, GW U/LCAs, Hotchkis Springs/Swaybars, DD HDX Cluster
-2007 Cobalt LT - 2.2L L61 I4 - M62 SC, FE5 Suspension, Much More
-2014 Cruze Diesel - 2.0L LUZ I4 Turbodiesel - MSR Wheels, UR Rear Bar
-2017 Volt LT - Voltec Gen 2 + 1.5L I4

Offline Cliff Ruggles

  • Global Moderator
  • Qjet Hero
  • *****
  • Posts: 4119
Re: Heavier throttle (mostly) issues
« Reply #25 on: September 11, 2019, 02:22:11 AM »
Your kit has a high flow solid fuel inlet seat which is correct for that carburetor.....Cliff

Offline MP81

  • Carb lover
  • ***
  • Posts: 66
Re: Heavier throttle (mostly) issues
« Reply #26 on: September 11, 2019, 04:28:44 AM »
Ok, cool, so it just looks different and has that springy plunger thing and no slots because it is a better part, correct? Or could my needle/seat be stuck somewhere (or did someone remove it entirely)?

Just wanted to double check. I saw a white piece, I think I saw it referred to a secondary cam or something? Couldn't find where that goes - perhaps I missed something in disassembly? Everything else looks to match something I've taken out, which is good.
« Last Edit: September 11, 2019, 04:34:39 AM by MP81 »
-1981 Camaro Z28 - 305 ci LG4 V8 - Headers, Dual Exhaust, GW U/LCAs, Hotchkis Springs/Swaybars, DD HDX Cluster
-2007 Cobalt LT - 2.2L L61 I4 - M62 SC, FE5 Suspension, Much More
-2014 Cruze Diesel - 2.0L LUZ I4 Turbodiesel - MSR Wheels, UR Rear Bar
-2017 Volt LT - Voltec Gen 2 + 1.5L I4

Offline MP81

  • Carb lover
  • ***
  • Posts: 66
Re: Heavier throttle (mostly) issues
« Reply #27 on: September 11, 2019, 10:58:46 AM »
Also, something I keep forgetting: Will I need a dwell meter to get this carb dialed in, since it is "electronic"?
-1981 Camaro Z28 - 305 ci LG4 V8 - Headers, Dual Exhaust, GW U/LCAs, Hotchkis Springs/Swaybars, DD HDX Cluster
-2007 Cobalt LT - 2.2L L61 I4 - M62 SC, FE5 Suspension, Much More
-2014 Cruze Diesel - 2.0L LUZ I4 Turbodiesel - MSR Wheels, UR Rear Bar
-2017 Volt LT - Voltec Gen 2 + 1.5L I4

Offline MP81

  • Carb lover
  • ***
  • Posts: 66
Re: Heavier throttle (mostly) issues
« Reply #28 on: September 11, 2019, 01:08:12 PM »
Just was able to pull all the epoxy off the plugs, so it's pretty apparent those are probably still leaking.

I see no way to remove these, is there some "easy" way? I won't have the time to tap and install plugs, unfortunately.

What epoxy should I use to cover them (and if they're removable, put in between the plug and where they go, so they stay in place)? I believe I saw Marine-Tex recommended before (JB weld makes a petroleum-resistant Marine epoxy now, too)? Of course nothing like that seems to be available locally, and tomorrow was going to be my full rebuild day, since this thing needs to be back on the car Saturday morning, so...
« Last Edit: September 11, 2019, 01:13:44 PM by MP81 »
-1981 Camaro Z28 - 305 ci LG4 V8 - Headers, Dual Exhaust, GW U/LCAs, Hotchkis Springs/Swaybars, DD HDX Cluster
-2007 Cobalt LT - 2.2L L61 I4 - M62 SC, FE5 Suspension, Much More
-2014 Cruze Diesel - 2.0L LUZ I4 Turbodiesel - MSR Wheels, UR Rear Bar
-2017 Volt LT - Voltec Gen 2 + 1.5L I4

Offline MP81

  • Carb lover
  • ***
  • Posts: 66
Re: Heavier throttle (mostly) issues
« Reply #29 on: September 11, 2019, 01:22:00 PM »
Just sprayed some water where I thought I was supposed to with soap water over the plugs and didnt even see the water move. Hmm...
-1981 Camaro Z28 - 305 ci LG4 V8 - Headers, Dual Exhaust, GW U/LCAs, Hotchkis Springs/Swaybars, DD HDX Cluster
-2007 Cobalt LT - 2.2L L61 I4 - M62 SC, FE5 Suspension, Much More
-2014 Cruze Diesel - 2.0L LUZ I4 Turbodiesel - MSR Wheels, UR Rear Bar
-2017 Volt LT - Voltec Gen 2 + 1.5L I4