Cascade Crew

STEEL · Posted: Fri Nov 16, 2007 1:31 pm Post subject: Quadra Jet

Ok, so I have the computer controlled quadra jet in my Z28. The choke is jacked up and preventing me from setting the timing, (It wont come off choke, and if you get it to, then it will sometimes re-engage the choke by its self). For now, I just want to disable the choke entirely, then fix that later. Lets get the car running right before I worry about the car idling in the cold (My old T/a didnt even have a choke, I handled it)

Also, I figure that the carb needs re-built, but I have never done it, is it difficult? How much does a re-build kit cost? Should I switch over to a non computer controlled q-jet from Pull A Part and then re-build that one instead? (Yes, I know that I need to put a non computer controlled Dis in at the same time)

Quasi-Traction · Posted: Fri Nov 16, 2007 4:43 pm Post subject:

I wouldn't waste my time rebuilding the CC Q-jet unless you really, really really care about fuel economy.

I personally bought a non CC-Qjet and had problems dialing it in right on two different motors (albeit, it was too much carb for one of those) so I gave up and got an Edlebrock 600. Cake to tune. However, keep in mind that might require you to buy a spacer or get a new intake manifold to make the Edlebrock fit on your engine.

You say the Choke is "jacked up"? is the 'Choke' light always on on your dash? If so, that doesn't always mean your choke isn't working. It can also point out when your charging system isn't grounding or completing a circut somewhere. Just double check your ammeter (the voltage gauge) and see if that dips when the choke light comes on.

The "choke" light would come on and off intermittently in my Berlinetta, just before my alternator went out, this was with the ECM removed too.

If its just something with the carburator itself, It seems to me there's a way to remove the upper butterfly and the lockout mechanisim for the secondaries. I dunno how this would affect the MCS (mixture control solenoid) though and if the car would keep running while cold.

Brandon might be able to chime in about this. My knoledge to the CC Qjet is limited to my personel experience with them.

chevymad · Posted: Fri Nov 16, 2007 5:25 pm Post subject:

The choke thermostat is probably toast. It's that round black thing on the passenger side with one wire going to it. Make sure it has power on that wire with the key on. If not check the fuse. If its got power and the choke still isnt opening then its the thermostat. 2 ways to disable, if you look at the linkage behind the thermostat you should be able to figure out how to wire it open. Or you could drill out hte rivets, or loosen the screws that hold the thermostat on, then turn the thermostat till the choke stays open. If you have to drill the rivets just put self tapping screws back in. I don't think rebuilding these is that hard, but you do NOT want to mess with any of hte adjustments. It takes special tools and a little luck to get things right again. There are alot of adjustments that can be made on a ccc. Another thing, don't mess with the idle mixture screws in the base plate at all. If its still factory they should actually have plugs over the top of them. On top of the carb is a large jet like thing with a screwdriver slot in it. That's where you adjust idle mixture. Unless you get a big cam then you can get more adjustment from the other screws. If its running fine except cold i'd just leave it all alone.

STEEL · Posted: Sat Nov 17, 2007 1:07 am Post subject:

The choke doesn't really ever shut off. If I get it to shut off, then it comes back on a few minuets later.

I have never seen a choke light on this car....

So not only does the choke increase the Idle, it also closes the secondarys? THAT EXPLAINS EVERYTHING!!!!

I have a choke to destroy >.<

Quasi-Traction · Posted: Sat Nov 17, 2007 7:39 pm Post subject:

Alphius · Posted: Sat Nov 17, 2007 9:55 pm Post subject:

I have a non-CC q-jet on my car, and I don't know if it's any different...

Anyway, until recently I've not had the choke hooked up because I had no switched 12v source in my wiring harness that was easily accessible. Now that it's getting cold again, I've hooked it up.

When I first built my engine, I had the same problem with my secondaries being locked out and the choke staying mostly on and only loosening up sometimes, cause there was no 12v to the solenoid. I manually disabled my choke entirely, fast idle and everything by using a ziptie to hold the lever that's activated by the solenoid down. It worked fine, and I had working secondaries. It was a little hard to start though, and was touchy in the mornings, especially in the cold, so I've got it all hooked up and working now, and it's loads better.

Zipties, I'm such a redneck. Embarassed

That's what I get for living in Lewis County though... Rolling Eyes

kidcamaro · Posted: Sun Nov 18, 2007 10:03 am Post subject:

i dont know how well it will work on a camaro, but on my dodge truck i had, i just put a manual choke on it. it comes with enough cable to run into the cab. ever since then every carb'd car i have ever owned i have put a manual choke on.

STEEL · Posted: Tue Nov 20, 2007 8:10 pm Post subject:

Ok, so I ripped out the first linkage that goes to the choke plates, and the second one that goes to the secondarys. at this point, the choke shouldn't work. Still idles high.

I installed a second return spring. Still idles high.

I dont know what it could be! Im out of ideas. It isnt as simple as just adjusting the idle screw, since it will SOMETIMES idle at 600, but usually, it likes to idle at 12.

Quasi-Traction · Posted: Tue Nov 20, 2007 8:12 pm Post subject:

hmm, I'd start digging around for broken, loose or misconnected vaccum hoses.

STEEL · Posted: Tue Nov 20, 2007 8:17 pm Post subject:

Ok, sounds like a plan. If any one else has any ideas on why this car hates me, call my cell, 253-686-0117

Im going back out in the garage, this is the only day i have access to my fathers shop.