Got it home. CC Quadrajet Issues

[MrSchaeferPants]

So I finally got my new 85 Jimmy home. Started messing around with it because it had some rough running issues. Ignition is fine, though does need timming. Biggest problem is the carb. It's 100% stock, all emissions and all. 4 bbl cc quadrajet. I know it needs a rebuild, because the first thing I did was spray the crap out of it with carb cleaner, and noticed while spraying the sides and base of the carb the rpm changes, so I know it leaks, plus you can just see it around all the gaskets.

So what I would like to do, and need help with, is just adjusting it enough so I can drive it around while I fix my 86 Blazer I'm about to sell, I need to do that first before I can just dive into the Jimmy. After the Blazer is done I plan on getting a rebuild kit, either the Ruggles or Doe book and having it at it.

I know there's the idle speed screw on the base/drivers side, and the solinoid near that I have to adjust. I'm just not getting the full picture. First thing I'ma do while I wait for replies is go out and buy a dwell meter and vac gauge since I don't have them. It's the stock carb, the numbers matched up, Goodwrench replacement 350, everything is hooked up right. Sticker says timing at 4* idle, warmed up, in drive, 650rpm'ish (have to look at it again) w/ac talkes about disconnecting wire to compressor and also removing the wire to the solinoid on the carb. Between the chilton manual and sticker is my info.

The Jimmy runs pretty nice cruising on the highway, rough like crap in park/neutral, Especially before it warms up. Choke seems to stay on forever and is hard to get it turned off. If I put it in drive/reverse it will kill the engine unless I give it gas. First thing I did was check spark plugs, cap/rotor, all looked recently replaced. I half assed played with the timing it was so far advanced I could barely see it, but tried to get it to 4* like the sticker said and it didn't like that, died out, but stays on with the wire to the solinoid disconnected. I didn't adjust the idle while retarding the timming, mostly because I don't have a dwell to check rpm.

Ok, I'ma go run and grab some meters and hopefully when I come back there'll be some input so I can get on track.

The blazer was so easy with a Edlebrock 1406 and it had a tach mounted to the dash. But I really like having a Qjet, I just need to learn to work on them and rebuild them. I remember my 86 Cutlass ran like a dream when the carb was rebuilt, and gas milage was awesome. I'm just carb dumb, and my first real learning will be with this Qjet. And I struggle with books, have someone show me once step by step and I'll remmeber it forever type.

Save the 'Quadra-junk' stuff. It will not be replaced. This is a battle I WILL win

 

[MrSchaeferPants]

And at further glance now that it's light outside and I'm not tired. According to the sticker it was originally a 305, so now my rpm and timming as per the sticker are null and void. It's a 86 or later 350 judging by the dipstick being on the passenger side. I'm only Assuming 350, since the valve covers still have the sticker saying Goodwrench 350. So now I'm lost as to what to set it to.

My late 70s 350 on my blazer I set to like 10 or 12 degrees btdc at around 850rpms idle. And that ran pretty nice.

Edit: So got a dwell meter and vacuum gauge just cause it's something I should just have. Truck barely starts. Only way I can get it to start is to advance the timing quite a bit, towards where it was before I started to mess with it. I believe I'm hearing knocking from the passenger side. So just to rule a bunch of easy stuff out I'm going to put in my new sparkplugs and go get some wires, even though they look new'ish. Make sure I'm getting spark at the plugs. I know I am from a couple cause I removed it and felt it and saw it. That method got tiring kinda quick.

 

[scottsdale86]

The variations you are having with the carb is due to vacuum leaks. Take care of that before you start thinking of a rebuild

 

[K85 Octane]

Do you have to run that carb? Can you go to a non-CC carb in your state?

 

[MrSchaeferPants]

Do you have to run that carb? Can you go to a non-CC carb in your state?

I can slap whatever I want on, it's old enough where there's no emissions or anything. I just want to use the ccc.

The variations you are having with the carb is due to vacuum leaks. Take care of that before you start thinking of a rebuild

I replaced a few lines last night, bought a crap ton of line, unfortuantly the hard line is hella expensive, can't even buy it by the foot here. I'll look at it again tomorrow morning and go through each line. What else to check for vacuum leaks other than the lines and intake manifold? Should I replace the carb to intake gasket even though I'm just going to rebuild it? At least to get my vacuum leaks taken care of first. Guess I'll track the vacuum leaks while I wait to get my books and rebuild kit in, since I can't find my one quadrajet book.

I'm just amazed that I can't even get it to run with the timing near what it's supposed to be. Couldn't even get it to drive 20ft to put it under the carport w/o having to advance the timming hella far. Oh well, I'll try to find all the leaks and see what I come up with.

 

[K85 Octane]

I just want to use the ccc.

I don't think I have ever read such a thing in my whole CK5 life.
If you need parts for one, I'm sure you'll run into plenty here. I have a complete that was running just fine when I pulled it

 

[MrSchaeferPants]

I don't think I have ever read such a thing in my whole CK5 life.
If you need parts for one, I'm sure you'll run into plenty here. I have a complete that was running just fine when I pulled it

It was so nice and pretty and stock'ish and unmolestered... though I am getting the itch to rip absolutely everything out. Changed spark plugs today and noticed the difference where in my blazer there is tons of room for me to sit in the engine bay and do whatever I need. I had to lay ontop of everything to reach the number 8 sparkplug.

 

[Big Ray]

I just want to use the ccc.

Isn't that blasphemy a banable offense?!?!?!

Q-jets can be awesome carbs, but I don't believe I've heard of anyone doing anything good with the cc model...

Do yourself a great favor, get the Quadrajet book by Doug Roe. It is one of the few good ones out there. linky

and check out this site, more good info. linky

edit: Just found this book, which is supposed to be newer and more detailed. linky

 

[MrSchaeferPants]

Isn't that blasphemy a banable offense?!?!?!

Q-jets can be awesome carbs, but I don't believe I've heard of anyone doing anything good with the cc model...

Do yourself a great favor, get the Quadrajet book by Doug Roe. It is one of the few good ones out there. linky

and check out this site, more good info. linky

edit: Just found this book, which is supposed to be newer and more detailed. linky

I had the Doug Roe book, cause I always planned on learning how to tear down and rebuild q-jets. Lost it, so last night I ordered that and the Haynes Techbook on q-jets. The Cliff Ruggles one I read was better for modifying than stock rebuilding. But I've read good things about that one too.

Slowly the idea of ripping it all out and putting a regular q-jet on it is getting to me. First thing is getting it to run well, and getting rid of my Blazer. Once I have some recouped money I may look into finding non cc q-jet. I am however ripping all the emissions out today. Already ordered a intake manifold to head gasket, and carb to intake gasket. So if all that will be out my way, might as well keep it off.

 

[K85 Octane]

didn't ur other blazer have an edelbock?
use that one and swap over the ccc.
swapping them will both get rid of ccc and give you a chance to look over leaks and new gaskets.
as long as swapping them doesn't kill the other blazer, you'll be able to sell it.

 

[MrSchaeferPants]

The other does have an Ebock 1406. As I'm slowly getting back into the swing of thing and spending time on the truck, don't think it's a ccc. I assumed. There's only one set of wires going to it and one wire goes to a plug on the thermostat, and the other goes into the harness.

Decided to remove all the smog. All I gotta do is go get some plugs for the exhaust manifold, and finish up these lines. I TRIED to do it systematically so I could remove everything smog related, and reconnect what wasnt. But a lot of 'I'll remmeber where that goes and get it in a min' and breaking a couple of the brittle hard lines left me with a few open ends by the time I was ready to plug the lines back in. So I found my camera and I'd like to play the 'what is that thing' game.

Numbers I got was 17085226/3124HLY So I know it's an '85 4bbl (duh) Fed Emission for an auto Chev. Built Nov 8th '84. I also saw a sticker reading remanufactured on the back of the carb. But where do I find those numbers reading Mw4 something or another, and what do those mean?

So what's that thingy and where does it supposed to go. I think T'd off with the distributor on the top left port (looking at the carb).

What's that thingy. I think it's for the cruise? Directly behind and to the left of the booster. I believe it was split with one of the small hard lines comming from the cannister, and intergrated into what I believed (from reading the chilton book vac/emission diagram) was a deceleration valve? went to Egr stuff and the smog pump. Saved what I think is this 'deceleration valve' cause if it's what I think it is, it goes to the cruise controll, unfortuantly the mount to the top of the Alt was broken, so it was just sitting there.

And both of these. All but one of the lines to one of them are untouched. And I have no idea what the missing one goes into, or how Important they are and if I could get rid of or plug or bypass any of them.

The part of the T facing the radiator I have going to what I think is the cruise thing. The part of the T facing the passenger side I have split between one of the lines that ends up comming from the distributor and the picture of the thingy on the firewall. Thingy #1.

Oh and the last thing, the diaphram on the passenger side exhaust manifold, what controlls it, why, and if it has no vacuum is it stuck open or closed? Currently plugged in.

 

[K85 Octane]

That carb isn't as bad as mine. Mine has the TPS sensor, computer, and non-vac advance HEI.

The valve thing on the exhaust manifold is for your air injection pump. Looks to be missing anyway. Doesn't hurt anything to leave it.

The white vac valve in the water neck is for your dizzy. I believe you can chuck that and run your dizzy vac line straight to the port on the front of your carb. Where your accelerator pump plunger is, straight below it. If there are more than 3 lines on that temp vac valve, then I don't know what the other stuff is lol. One should be coming from the carb and one goes to the dizzy.

If you don't have smog, you can chuck most of it. 99% if you don't have Cruise or AC.

I'm working on all of that stuff to. Problem is, I have to keep it all.