Idle drops when put in gear - Team Camaro Tech
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post #1 of 10 (permalink) Old Aug 7th, 10, 08:32 PM Thread Starter
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Idle drops when put in gear

69 Camaro, 350/300 original motor, Quadrajet carb

Engine and trans rebuilt about 1,000 miles ago, mild cam, 10/1 cokmpression, rebuilt and restored carb, it's never quite idled correctly. New points, plugs, wires, dist cap, condenser and rotor, fuel filter, fuel pump, vacuum advance.

In neutral it is set at about 800, drops down to about 550 - 600 when put in gear. Played with the idle circuit today, pulled the screws and blew them out, readjusted. Idle is set at 11 degrees adv, total advance is 31.... any higher than that and it pings.

Played with the idle speed and it seems "happy" at around 800 static. Has a slight hesitation at initial acceleration (about 1/2 of a second), and then it just runs like a brand new motor. Doesn't have the greatest acceleration at low end but not sure what to compare it to??? Seems like it should have a little more "umph" at takeoff.

Thoughts batted around today with Farmboy are:
  • Carb rebuild? - It's fresh, but maybe the restoration company I sent it to didn't do it properly??
  • Torque converter? - The trans is not original, but it is from a 69 Camaro. The transmission shop I sent it to for a rebuild put a torque converter on it, but I don't know which one they used
I hate to mess wit hit because it runs so good, but it would be nice to see a little more power from it at lower RPM's and get rid of the loping at idle when in gear.

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post #2 of 10 (permalink) Old Aug 8th, 10, 02:07 PM
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Re: Idle drops when put in gear

With aftermarket camshaft, as you see, more initial tining is needed, and more curb idle.
With a stock convertor, read tight, I would expect the amount of drop.
Might try reducing the idle speed alittle to reduce the amount of idle rpm drop.
Might try the other hole in the in the accelerator lever to reduce stumble.

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post #3 of 10 (permalink) Old Aug 8th, 10, 04:14 PM Thread Starter
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Re: Idle drops when put in gear

Thanks Everett...

We played with the idle speed, back and forth with the fuel mixtures, trying to find the right combination. Started out at about 730, bumped it as high as 1,100 with varing idle speeds / fuel trim. Found that it runs best at where it currently is, but for that dang "curb idle", as you put it.

I'll take a shot at moving it to the other hole ... THAT would be cool if it was the fix.

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post #4 of 10 (permalink) Old Aug 9th, 10, 10:39 AM
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Re: Idle drops when put in gear

Is this a new symptom or has this been the way it has run since day 1?

alan
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post #5 of 10 (permalink) Old Aug 9th, 10, 10:56 AM Thread Starter
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Re: Idle drops when put in gear

Quote:
Originally Posted by alanrw View Post
Is this a new symptom or has this been the way it has run since day 1?

alan
It's been happening ever since the motor and trans got rebuilt. That was the first thing we did after I bought it.

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post #6 of 10 (permalink) Old Aug 9th, 10, 11:17 AM
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Re: Idle drops when put in gear

With a vacuum gauge connected to the manifold, what is the reading of the gauge?

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post #7 of 10 (permalink) Old Aug 9th, 10, 11:38 AM
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Re: Idle drops when put in gear

Hmm, could it be the character of the cam? He is running 10:1 compression. If the cam is anything like a Z-28, off idle response is gonna kinda anemic, right?

I would think that any time you start changing engine parameters in a custom build, varibles start changing pretty quick and unanticipated symptoms can arise, no?

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post #8 of 10 (permalink) Old Aug 9th, 10, 11:57 AM Thread Starter
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Re: Idle drops when put in gear

Quote:
Originally Posted by Everett#2390 View Post
With a vacuum gauge connected to the manifold, what is the reading of the gauge?
Dunno - The last time I had it on the road (18 months ago) I was at Farmboy's house and he adjusted it accordingly. I will have to wait until I can go to his house again to see.

I just read through the instructions on the Vac gauge and it says (in the instrutions) that it should be between 17 and 22. However, looking at the gauge, it has a "red zone" in that area with writing on the gauge that says, if it IS in that range (including the 17-22 reading) that it needs _________ (something.. I can't remember now??? Maybe valves adjusted? )

Anyway, I am not sure how to use that tool so I will wait until I get with Farmboy and see what he can decipher. Thanks for the help.

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post #9 of 10 (permalink) Old Aug 9th, 10, 12:06 PM Thread Starter
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Re: Idle drops when put in gear

Here's the cam I used:

Summit Camshafts
Camshaft, Hydraulic Flat Tappet, Advertised Duration 272/ 282, Lift .442/ .465, Chevy, Small Block

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post #10 of 10 (permalink) Old Aug 9th, 10, 12:42 PM
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Re: Idle drops when put in gear

My vacuum gauge is red-lined and says the same thing at that range..... "Timing Too Late" (or something to do with timing) and something about "Valves Not Adjusted".
Hey, if I'm getting 18\19 inches of vacuum, I'm happy!

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