Main air bleed question?

[slicer87]

 I think I have found what is causing my idle problem. The CCC Qjet I had rebuilt by a local shop seems to be missing restrictors for the main air bleeds in the airhorn. My carb is for an 1986 Monte Carlo SS so should it have these restrictors since I read that missing ones can cause trouble but some Qjets didn't came with them. Sadly I can't remember if my carb had them before the rebuild.

[73ss]

Hi,
I have a un-molested carb from an '86 SS & this one has the large bleeds in the air-horn & in the main body as do most every chevy carb that I have seen from the early '70's until the end...

[slicer87]

 Thanks for the answer, does your 86 carb have any kind of inserts in the main bleeds or are there no inserts at all? 

[slicer87]

Anybody? 

[73ss]

No it does not have any inserts in the bleeds. The bleeds are roughly .125" The CCC carbs can be fussy if they are not adj properly..

[slicer87]

 Well my problem is that the engine will not run under 1K without shuting right down. I read online that missing air bleed restrictors can do this and that many carb rebuilding shop remove the restrictors. My carb was not rebuilt by Cliff, I had a local shop rebuild it which was a mistake. 

[73ss]

I overhauled one of these units some years back and could not get it to idle either. I finally took it to a shop and they adj it & got it to run great. I believe the procedure calls for a dwell meter attached to the green? lead coming from the wire harness in front of the carb. Does the MC solenoid click when running? This is about all I know about these units..

[slicer87]

The dwell is off and I checked for vacuum leaks and there are none. The IAB and mix needles have no effect on the dwell. That is why I am thinking the guy goofed something up.

[Cliff Ruggles]

Those models use large MAB's.  However, this has nothing to do with the idle quality, or how much idle fuel is available to the mixture screws.

The idle system is adj via the upper idle airbleed adj in the airhorn, in addition to the idle mixture screws in the baseplate.

If you can't bring it within range using both adjustments, it needs to be take apart to find out why?.....Cliff

[slicer87]

 Then I am guessing it is the idle tubes then. Cliff the idle tubes you sell do they need to be drilled out to match the old tubes in the carb?