Cascade Crew

Sellmanb · Member Joined: 30 Nov 2004 Posts: 727 Location: Tigard, OR

After I swapped motors, and re-used the CC Qjet, I have had an extremely high idle. Tapping the gas does not help. I was under the impression that the Qjets did not need fiddling with like normal carbs, as the computer controls most of it. So I am wondering what I can check for this high idle problems?

Note: the car sat un-running for about a year before I got the new (to me) motor in, so I am sure that is adequate time for carb parts to freeze up or something.

Thanks,

Bobby

chevymad · Posted: Mon Nov 14, 2005 6:17 pm Post subject:

There's a weight for the fast idle cam on the passenger side. Between the round choke thermostat and the body of the carb.It kinda sticks forward out from behind there. Alot of times it can get stuck straight up. Just bumping it with your finger should make it drop and the motor will idle down.

Sellmanb · Member Joined: 30 Nov 2004 Posts: 727 Location: Tigard, OR

Thanks Brandon, I went out and tried starting the car this morning but I guess 34 degrees is the temperature when my car says "NUH UH!" . So I'll try starting it again around noon when it's a lil warmer and I can keep it running.

Sellmanb · Member Joined: 30 Nov 2004 Posts: 727 Location: Tigard, OR

Car will start, and idle for about 10 seconds, then dies no matter how much I gas it. Must be something wrong with the carb. Not to mention the excess blow-by from the motor.

I'm about to sell this thing and all my other 3rd gen stuff just so I can get a 91-92 TPI 5 speed camaro. It's either that or I can build a cheap short block (already have a block), rebuild the carb, and hope to make it to dyno day by then. Otherwise the truck's getting taken to the dyno... again lol.

Quasi-Traction · Posted: Wed Nov 16, 2005 11:32 am Post subject:

what about getting rid of the Q-jet altogether and getting like a Holley, Edlebrock or Demon Jr? You said you have a ZZ4 intake right? Is it spread bore or square bore?

Twilightoptics · Posted: Wed Nov 16, 2005 12:25 pm Post subject:

chevymad · Posted: Wed Nov 16, 2005 6:21 pm Post subject:

The Qjet's a super simple carb. I can never understand why people think holley's are easier. The edelbrock/afb is even more simple but doesnt perform like either the Q or the holley style carbs.

I think you have an easy problem.. if I was there lookin at it. LOL. Hard to tell whats goin on from here though. Sounds like a choke issue. Just to trouble shoot it, stick a screwdriver in the choke flap to hold it open. Make sure it doesnt interfere with anything else and is large enough not to fall in. Now try to start it. If it does start you'll have to keep it running for awhile before it will run on its own. If not, try pumping the throttle once.. in fact look down the carb while you do this.. just to see if it squirts fuel. Then try to start it again. Still no go? Floor the throttle, do not pump it, do not let the pedal up. At least until the car starts and smooths out. This will clear out any flooding and is the most likely thing you'll have to do I think.

If you can get it to start with the screwdriver i'm betting that the choke pulloff isnt working. There's at least 1 vacuum diaphram on the passenger side, sometimes theres 2. When the car starts the diaphram pulls the choke open maybe 1/4" or so. This allows enough air into the motor to keep it from flooding out.

This blowby issue.. is it blowing oil out of the valve covers? What's goin on there? How can you tell if its running so poorly? Also, if the chokes not working or the float is sinking the carb can dump enough fuel in the cylinders to thin out your oil. This will make more blowby too.

Another good point.. There are 2 things that usually happen to Qjets. The first is the float sinks. If you can get it running.. look down the carb with it idling. You should NOT see fuel dripping out of the booster(small round things in the primaries). If you do you'll have to rebuild the carb(pretty simple). The other thing that happens, but usually on older castiings is the throttle shafts in the base wear out. This causes a huge vacuum leak. Just wiggle the throttle linkage and watch the shaft to see how much play is in it. This doesnt sound like your problem now though.

Is this the CCC carb btw? Or a non computer controlled one?

Sellmanb · Member Joined: 30 Nov 2004 Posts: 727 Location: Tigard, OR

Thanks Brandon, I'll be checking all those on my next day off (Wednesday, ugh).

It's a CCC Qjet.

As for switching over to a Holley or the like....

I have had MINOR experience with carbs (can you tell?) but I dont see how having to adjust every aspect of the carbeurator is simpler than letting a computer do it for me, get decent gas mileage, and performance on demand. I am pretty set on CCC Qjet. Thanks for the idea though, I do appreciate any I can get at this point!

The blowby... imagine what your exhaust looks like when you just start the car up on a cold morning. That's what comes out of my breather tube.. pillowing basically.

It spews out enough oil through there to fill up a new breather in about 2 weeks. Most of it gets through my breather though, and I have a nice small puddle in my air cleaner base (does not smell like typical oil... smells more sweet I supposed... no coolant in oil though)

I suspect a hole in a piston or something lol.

The car will start, but it will not STAY started. It will stay started idling for about 10 seconds before it (feels like) runs out of gas. If I leave it idling for a couple seconds and then gas it (at all) it just dies (feels like out of gas again).

If I start it and IMMEDIATLY (sp? lol) gas it to like 3krpm it will stay running (but I'm sure as heck not going to drive it like that)

Most the time I dont have to pump the gas but maybe once to start it. More often than not I can just crank and it does the rest itself.

I hope this helps?