q-jet bog - Team Camaro Tech
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post #1 of 4 (permalink) Old Dec 2nd, 01, 03:51 PM Thread Starter
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Join Date: Aug 2001
Location: davisburg, michigan, united states
Posts: 114

I have a q-jet that bogs bad when the secondaries are supposed to open, when running engine with no load like in park or neutral,the secondaries work fine, but as soon as im driving, if i go to stomp on it, it spits, and almost dies, then about 4 seconds later, it starts to pick up speed. They are opening all the way too. Any info would help, thanks
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post #2 of 4 (permalink) Old Dec 2nd, 01, 08:14 PM
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Join Date: May 2001
Location: Ashby,MN, USA
Posts: 8,305

the secondaries are opening too fast...they shouldn't open at all under no load situations. you can tighten it up a little bit with a screw that can be a pain to get to. maybe someone else can explain it.

1971 Nova(looks like 69 camaro from underneath!)
355sb, vortec heads, HOT cam,T-10 tranny, 3.70 gears 16" IROC wheels
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post #3 of 4 (permalink) Old Dec 3rd, 01, 01:26 AM
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Location: Va Beach VA
Posts: 31,626

As novaderrick suggests, Q-jet secondaries are opening too quick.

The adjustment is pretty simple,
1. Look at the pass side of carb,
2. In the upper left hand corner, there will be a slott for a 3/16 in flat screwdriver.
3. Underneath, pointing down is a 3/32 allen screw, this clamps the spring.
4. Loosen the clamp screw,
5. Slowly turn spring wrap-up screw CCW until the tension is released. DO NOT try to go further.
6. Now, slowly turn CW, usually 1 complete turn, tighten clamp screw.
7. Check for bog, if still there, continue to turn CW, tighter spring, in 1/4 turn increments until bog goes away.

The above procedure slows the opening of the air doors to lift the rods up out from their respective jets to provide extra fuel on engine's demand. The throttle plates are opened, but, until the engine develops enough air flow through the secondaries, air doors are closed. Then as rpm's increase, air speed increases, and doors open, more fuel given, mo power!

I always had a bog, a consistent bog, on two early Camaro's I owned. After adjusting, I dropped 60' times from 1.9's to 1.6's.

Everett 68/350/PG/11.90/115mph
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post #4 of 4 (permalink) Old Dec 3rd, 01, 01:37 PM
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Join Date: Feb 2001
Location: Concord Cal. USA
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Make sure the hose to the pulloff is not broken and hooked up.

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